Geotechnical Oklahoma Archives - GEOTILL provides geotechnical, construction testing and Environmental services Indianapolis Indiana

Stress in Earth’s crust determined without earthquake data

Source: Stress in Earth's crust determined without earthquake data Scientists at Los Alamos National Laboratory have developed a method to determine the orientation of mechanical stress in the earth's crust without relying on data from earthquakes or drilling. This method is less expensive that current approaches, could have broad applicability in geophysics and provide insight into continental regions lacking historical geologic information. "We utilized the nonlinear elastic behavior in rocks and applied a new technique to monitor the orientation of the maximum horizontal compressive stress in rocks in parts of Oklahoma and New Mexico," said Andrew Delorey of Los Alamos. "The orientation of that maximum horizontal compressive stress reveals which fractures in the rock will be active." North-central Oklahoma was selected because induced seismic activity has been ongoing in the region after decades of injected wastewater from oil and gas operations. That seismic activity occurs on faults optimally oriented in the regional stress field. North-central New Mexico was selected to compare the results to a geologic setting straddling a continental rift separating the Colorado Plateau from a stable section of the earth's crust. The scientists determined that the earth exhibits stress-induced anisotropy of nonlinear susceptibility that is aligned with the maximum horizontal compressive stress in these two different geologic settings. Rocks become stiffer when compressed and softer when extended, but this effect isn't instantaneous. The rate is faster in the orientation where the ambient stress field is most compressive. By measuring this rate in different orientations, scientists can determine the orientation where ambient stress is most compressive. Determining the geophysical stress orientation, or the direction of maximum horizontal compressive stress, is usually determined by drilling narrow, deep boreholes. However, borehole drilling is expensive and only provides a single data point. Additionally for vast regions, the geophysical data simply hasn't been collected because [...]

By kk42|October 11th, 2021|Geotechnical Oklahoma, Denver, Albuquerque, Oklahoma City, Colorado Springs, Las Cruces, Tulsa, Aurora, Santa Fe, Norman, Lakewood, Rio Rancho, Lawton, Fort Collins, Roswell, Broken Arrow, Arvada, Farmington, Edmond, Pueblo, Alamogordo, Midwest City, Westminster, Clovis, Enid, Boulder, Hobbs, Moore, Thornton, Carlsbad, Geotechnical Colorado, Stillwater, Geotechnical New Mexico|0 Comments

Concrete Dam Safety Inspection with Ground Penetrating Radar GPR

Source: Concrete Dam Safety Inspection with Ground Penetrating Radar GPR | For Construction Pros A non-destructive with ground-penetrating radar inspection could save time and money during investigations of this critical element in concrete infrastructure. GSSI using the Structure Scan™ Mini XT to refine the dam survey area. Geophysical Survey Systems As the world struggles to improve its critical infrastructure, many are seeking out non-destructive testing (NDT) methods that can help to accurately determine what can be repaired and what needs to be replaced. In the field of dam safety, NDT methods are seen as a way to cut down on the actual work that has to be done, while making sure that condition data is most accurate. Engineers, facility managers, and dam operators need accurate information on the structural health of their facility to take decisive action to prevent catastrophic incidents. Earthquake monitoring systems can assist decision-making by providing predictive data before an earthquake and evaluating the structural integrity of the dam or levee before and immediately after an earthquake (Dam Safety Group, Ground-Penetrating Radar for Dam Investigative Applications, 2021) Among the available NDT methods, ground-penetrating radar (GPR) is growing in importance for dam evaluation applications. Increasingly, both public- and privately-funded dam owners are looking to GPR technology to inspect the dam infrastructure and surrounding areas. GPR can be cost-effectively integrated with other types of ground surveys to build a visual understanding of the overall subsurface of the site. The technology can be rapidly deployed, provides an effective means to evaluate subsurface information, and contributes to continuous monitoring and condition assessment throughout a structure’s life. In response to the need for the best possible NDT methods, several industry experts founded the Dam Safety Group, which provides a wide range of geophysical and seismic techniques and technologies to address non-invasive [...]

By kk42|October 11th, 2021|Geotechnical Missouri, Geotechnical Georgia, Geotechnical Kansas, Geotechnical Mississippi, Geotechnical Oklahoma, Geotechnical Texas|0 Comments

Peer-Reviewed Paper Explains Unprecedented Performance of BioLargo’s AOS Water Treatment Technology

Source: Peer-Reviewed Paper Explains Unprecedented Performance of BioLargo's AOS Water Treatment Technology - Digital Journal WESTMINSTER, CA / ACCESSWIRE / October 4, 2021 / BioLargo, Inc. (OTCQB:BLGO), a developer of sustainable cleantech technologies and full-service environmental engineering company, announced the publication of an important peer-reviewed article confirming that its innovative water treatment technology, the Advanced Oxidation System (AOS), generates highly energetic iodine molecules. The article establishes the foundational scientific principles about why the AOS is a powerful, efficient, and novel water treatment technology. The BioLargo AOS, which is currently deployed in a demonstration pilot project at a municipal wastewater treatment plant, is a ground-breaking water treatment platform that provides rapid and effective disinfection and concurrent organics removal while consuming less electricity than other common treatment technologies. The AOS has previously been shown in bench-scale and pilot-scale studies to exhibit greater water disinfection and decontamination performance than would be expected in similar water treatment technologies. This spurred BioLargo scientists and academic collaborators to elucidate the exact electrochemical mechanisms of the AOS in this study. The paper, published in the American Chemical Society’s journal ES&T Water, examines the mechanism by which the BioLargo AOS produces such rapid and effective disinfection performance relative to past electrochemical water treatment technologies. The study used the Canadian Light Source particle accelerator to perform advanced measurements of the chemical reactions that occur inside the AOS during operation. This technique revealed that the AOS generates highly oxidized iodine molecules that the researchers concluded are likely responsible for the technology’s elevated disinfection efficacy. These special iodine molecules were only present inside the active layers of the AOS and were neutralized before water flowed out of the AOS. Dr. Richard Smith, President of BioLargo Water commented, “Our AOS technology is a technical leap forward in advanced water treatment. This study is [...]

By kk42|October 5th, 2021|Geotechnical West Virginia, Geotechnical California, Geotechnical New Mexico, Geotechnical Oklahoma, Geotechnical Texas|0 Comments

Mitigating carbon may have unintended consequences

Source: Mitigating carbon may have unintended consequences | Penn State University UNIVERSITY PARK, Pa. — Controlling carbon release into the atmosphere will reduce carbon dioxide and slow global warming, but could there be unintended consequences for human health? Now, thanks to a three-year grant of about $400,000 from the National Science Foundation, researchers at Penn State will investigate potential positives and negatives of decarbonization. "There can be unintended health co-harms from some carbon mitigation strategies," said Wei Peng, assistant professor of international affairs and civil and environmental engineering and principal investigator on the project. "For instance, large-scale bioenergy production may drive up food prices, which leads to nutrition-related health co-harms." Of course, mitigating carbon can also bring health benefits, including a reduction of pollution in the atmosphere. "Tangible human health co-benefits can motivate stronger support for climate policy," said Peng. The researchers aim to improve understanding of what factors determine the size and scope of health outcomes from decarbonization and to identify strategies most likely to yield overall health benefits. Focusing on the U.S., Peng and her team will develop a framework integrating energy, food and health. They will improve health variables in a state-level integrated assessment model and connect it to a fine-resolution, health impact assessment model. They will also develop a large number of scenarios of decarbonization to encompass future uncertainties, technology and markets. This project is the extension of two seed grants from Penn State's Institutes of Energy and the Environment and Institute for Computational and Data Sciences. Vivek Srikrishnan, assistant professor of biological and environmental engineering, Cornell University, is the co-principal investigator (PI) on this project. Peng is also a co-PI on a project looking to model the interactions of climate change, air quality and social inequalities. This five-year, $1.5 million NSF grant, co-led by Mark [...]

By kk42|September 29th, 2021|Geotechnical Iowa, Geotechnical Kansas, Geotechnical North Carolina, Geotechnical California, Geotechnical New York, Geotechnical Oklahoma, Geotechnical Oregon, Geotechnical Texas, Geotechnical Washington, Geotechnical Alabama|0 Comments

Breaking Uncommon Ground in the Kansas Countryside

Source: Breaking Uncommon Ground in the Kansas Countryside - Alpha-Omega Geotech, Inc. Look beyond I-435 to the west of Kansas City’s urban core and you’ll see a surge of new commercial development taking shape. It’s not all typical, flat farmland and turning it into opportunity requires a strategic approach. Before you put together plans for a construction project, consider a few pointers based on our experience. Don’t Be Surprised by a Predictably Unpredictable Subgrade. Be careful not to make assumptions about what’s just below the surface and deeper down, especially along K-10 in the vicinity of Lenexa. Every potential build site is different to some degree and variations from site to site can be substantial. Much of the landscape is hilly, and history has left behind miscellaneous man made factors that will impact everything from site selection to construction. Decades of variables ranging from undocumented subgrade material, buried trees and buried gravel roads to improperly filled farm ponds lurk underground, even in areas that appear to be untouched. In addition, old limestone mines abandoned as far back as the 1980s wind through the area and present ongoing challenges for developers. The proximity of mines isn’t necessarily a deal breaker when it comes to project site selection, but you’ll need to clearly understand the limitations of the subgrade above and around them. You’ll also need to be on the lookout for mine spoils material carved out over the years and buried for disposal. Uncovering subgrade wildcards and narrowing site selection is only possible through an extensive investigation. A precise boring plan with thorough soil testing will be critical in the hunt for a project site that’s feasible in context of your timeline and budget. Make sure your geotechnical engineering partner knows exactly how you expect foundations to perform so that they can pinpoint [...]

UD researchers study climate change impacts on soils at military installations

Source: The Ground Underfoot - Civil and Environmental Engineering UD researchers study climate change impacts on soils at military installations We walk over it, drive over it and build on it. Yet, it is probably safe to say, most of us rarely think about the ground beneath our feet. Underneath the grass, concrete, asphalt and other materials in our built environment, however, soil provides structure and stability for what lies above. The United States military wants to understand the role that climate impacts, such as flooding, storm surge or sea level rise, will have on soils at its coastal military bases and facilities, which are critical to national security. Soil conditions can affect the integrity of the ground underpinning buildings, roads, bridges and more. For example, if a soil’s pH were to rise significantly, due to increased salt content-containing ions such as sodium from storm surge, it could create saline conditions that could hamper the ground’s ability to support this necessary infrastructure. Understanding these threats will enable faster and more accurate routing and maneuverability for U.S. forces. The Delaware Environmental Institute (DENIN) is collaborating with the Engineer Research and Development Center (ERDC) of the U.S. Army Corps of Engineers and Louisiana State University to understand how vulnerable military installations along coasts may be affected by soil changes due to sea level rise and coastal flooding. DENIN has received $3.79 million in first- and second-year funding from the U.S. Department of Defense to start this work, and is eligible for an additional $3.82 million in continued funding over the following two years. Led by DENIN Director Don Sparks, Unidel S. Hallock du Pont Chair of Soil and Environmental Chemistry in UD’s Department of Plant and Soil Sciences, the UD effort includes interdisciplinary collaboration with Yan Jin, Edward F. and Elizabeth Goodman Rosenberg Professor [...]

By kk42|September 22nd, 2021|Geotechnical Alabama, Geotechnical Texas, Geotechnical Arizona, Geotechnical Tennessee, Geotechnical New Hampshire, Geotechnical Connecticut, Geotechnical Utah, Geotechnical Arkansas, Geotechnical Ohio, Geotechnical New Jersey, Geotechnical Florida, Geotechnical Vermont, Geotechnical California, Geotechnical Illinois, Geotechnical New Mexico, Geotechnical Iowa, Geotechnical Virginia, Geotechnical Colorado, Geotechnical Michigan, Geotechnical New York, Geotechnical Kansas, Geotechnical Washington, Geotechnical Delaware, Geotechnical Missouri, Geotechnical North Dakota, Geotechnical Mississippi, Geotechnical Wyoming, Geotechnical Idaho, Geotechnical Georgia, Geotechnical Oklahoma, Geotechnical Nebraska, Geotechnical Louisiana, Geotechnical Maryland, Geotechnical Oregon, Geotechnical North Carolina, Geotechnical Maine, Geotechnical Pennsylvania, Geotechnical Rhode Island, Geotechnical West Virginia, Geotechnical Indiana, Geotechnical Massachusetts, Geotechnical Wisconsin, Geotechnical South Carolina, Geotechnical USA, Soil Testing, Geotechnical Montana, Geotechnical Minnesota, Geotechnical South Dakota, Geotechnical US, Geotechnical Kentucky, Geotechnical Nevada|0 Comments

Parameters Variation Model Customization and Sensitivity Analyses

Source: Parameters Variation: Model Customization and Sensitivity Analyses Parameters Variation Model Customization and Sensitivity Analyses A well-known engineering challenge in the framework of finite element (FE) analysis-based design is the large number of input factors involved in geotechnical computational models. There is always a significant amount of uncertainties associated with the properties of geomaterials, being naturally highly heterogeneous materials. In the context of model calibration and validation, conducting a sensitivity analysis is very important. This can determine the key factors which govern the system and efficiently characterize the geotechnical variability for any considered design problem. Powerful mechanisms for the consideration of parameter variation are also very interesting for speeding up FE model creation and automating results in post-processing. These are also quite useful in reducing model definition for specific types of engineering problems (excavation wall of a specific type under simple ground conditions, simple tunnel shape in uniform rock mass, etc.) to a limited number of parameters that can be inputted in a text file or Microsoft Excel spreadsheet without expert knowledge of the PLAXIS user interface and different modeling techniques and FE know-how. The sensitivity analysis and parameter variation tool in PLAXIS A sensitivity analysis determines how different values of an independent variable affect a particular dependent variable under a given set of assumptions. In other words, sensitivity analyses study how various sources of uncertainty in a mathematical model contribute to the model's overall uncertainty. The Sensitivity Analysis and Parameter Variation tool (see Figure 1) can be used to evaluate the influence of model parameters on calculation results for any particular PLAXIS FE model: The Select Parameters tab sheet will first provide information about all the parameters that can be changed to perform the sensitivity analysis. Available parameters include most model parameters of the data sets for soil and [...]

By kk42|September 21st, 2021|Geotechnical Tennessee, Geotechnical Nevada, Geotechnical Alabama, Geotechnical Texas, Geotechnical Arizona, Geotechnical Ohio, Geotechnical New Hampshire, Geotechnical Connecticut, Geotechnical Utah, Geotechnical Arkansas, Geotechnical Illinois, Geotechnical New Jersey, Geotechnical Florida, Geotechnical Vermont, Geotechnical California, Geotechnical New Mexico, Geotechnical Iowa, Geotechnical Virginia, Geotechnical Colorado, Geotechnical Michigan, Geotechnical New York, Geotechnical Kansas, Geotechnical Washington, Geotechnical Delaware, Geotechnical Missouri, Geotechnical North Dakota, Geotechnical Mississippi, Geotechnical Wyoming, Geotechnical Idaho, Geotechnical Georgia, Geotechnical Oklahoma, Geotechnical Nebraska, Geotechnical Louisiana, Geotechnical Maryland, Geotechnical Oregon, Geotechnical North Carolina, Geotechnical Maine, Geotechnical Pennsylvania, Geotechnical Rhode Island, Geotechnical West Virginia, Geotechnical Indiana, Geotechnical Massachusetts, Geotechnical Wisconsin, Geotechnical South Carolina, Geotechnical USA, Geotechnical Kentucky, Geotechnical Montana, Geotechnical Minnesota, Geotechnical South Dakota, Geotechnical US|Comments Off

A Climate Change-Induced Disaster in Denali National Park

Source: A Climate Change-Induced Disaster in Denali National Park | Time The Times has recently showcased an article on the current rockslide situation in Denali National Park. The effects of climate change have been dramatic with the current melting of the permafrost. The National Parks Service has recently upped through gravel removal of the Pretty Rocks Landslide in an effort to keep up as the rapidly thawing permafrost picks up pace. Alaska is right now recognized as the country’s fastest-warming state. The landslide hit unprecedented speed 4 weeks ago causing the team to close the back half of the park weeks earlier than anticipated. This only signals bad news as reservations are canceled in the short term and the long term implications are yet unknown. “This is the canary in the coal mine for infrastructure disruption in Alaska,” says the Camp Denali lodge owner Simon Hamm. “If things continue on the path they’re on, it’s not going to just be Pretty Rock—it’s going to be half of the Alaskan highway system.” Rapid deterioration Denali National Park is one of the U.S.’s largest national parks at 6 million acres, and sits about four hours north of Anchorage. While the entrance to the park is certainly beautiful, many people prefer to hop on buses to access the park’s marquee attractions deep down its single 92-mile road: views of Mt. Denali (formerly Mt. McKinley), the highest peak in North America at 20,000 feet; the gleaming Wonder Lake; rolling mountainsides that contain an abundance of wildlife, including grizzly bears, moose, caribou and bighorn sheep. About halfway along the road lies the Pretty Rocks Landslide, a slowly sliding section of earth that acts more like a glacier than a rockfall. Since the 1960s, permafrost deep below the earth’s surface has thawed, causing the soil and [...]

By kk42|September 21st, 2021|Geotechnical Tennessee, Geotechnical New Jersey, Geotechnical Florida, Geotechnical Vermont, Geotechnical California, Fairbanks, Geotechnical Ohio, Geotechnical New Mexico, Geotechnical Iowa, Geotechnical Virginia, Geotechnical Colorado, Badger, Geotechnical Illinois, Geotechnical New York, Geotechnical Kansas, Geotechnical Washington, Geotechnical Delaware, Knik-Fairview, Geotechnical Michigan, Geotechnical North Dakota, Geotechnical Mississippi, Geotechnical Idaho, College, Geotechnical Missouri, Geotechnical Oklahoma, Geotechnical Nebraska, Geotechnical Louisiana, Wasilla, Geotechnical Georgia, Geotechnical Oregon, Geotechnical North Carolina, Geotechnical Maine, Tanaina, Geotechnical Maryland, Geotechnical Rhode Island, Geotechnical West Virginia, Geotechnical Massachusetts, Lakes, Geotechnical Pennsylvania, Geotechnical South Carolina, Geotechnical USA, Landslides, Geotechnical Montana, Kalifornsky, Geotechnical Minnesota, Geotechnical South Dakota, Geotechnical US, Geotechnical Alaska, Geotechnical Indiana, Geotechnical Nevada, Geotechnical Alabama, Geotechnical Texas, Geotechnical Arizona, Anchorage, Geotechnical Kentucky, Geotechnical New Hampshire, Geotechnical Connecticut, Geotechnical Utah, Geotechnical Arkansas, Juneau|0 Comments

Geotechnical Instrumentation and Monitoring Consumption Market Size to Witness Huge Growth by 2027 | By Top Leading Vendors – Keller, Fugro, Nova Metrix, Geokon, Geocomp, Sisgeo, Cowi – The Daily Chronicle

Source: Geotechnical Instrumentation and Monitoring Consumption Market Size to Witness Huge Growth by 2027 | By Top Leading Vendors – Keller, Fugro, Nova Metrix, Geokon, Geocomp, Sisgeo, Cowi – The Daily Chronicle

By smadi66|September 22nd, 2020|Geotechnical West Virginia, Geotechnical Montana, Geotechnical Maryland, Geotechnical South Dakota, Geotechnical Services, Geotechnical Nevada, Geotechnical Pennsylvania, Geotechnical Texas, Geotechnical Arizona, Geotechnical New Hampshire, Geotechnical Wisconsin, Geotechnical Utah, Geotechnical Arkansas, Geotechnical Indiana, Geotechnical New Jersey, Geotechnical Minnesota, Geotechnical Vermont, Geotechnical California, Geotechnical Kentucky, Geotechnical New Mexico, Geotechnical Alabama, Geotechnical Virginia, Geotechnical Colorado, Geotechnical Tennessee, Geotechnical New York, Geotechnical Connecticut, Geotechnical Washington, Geotechnical Delaware, Geotechnical Illinois, Geotechnical North Dakota, Geotechnical Florida, Geotechnical Wyoming, Geotechnical Idaho, Geotechnical Michigan, Geotechnical Oklahoma, Geotechnical Mississippi, Geotechnical Louisiana, Geotechnical Missouri, Geotechnical Oregon, Geotechnical Nebraska, Geotechnical Maine, Arlington Heights, Geotechnical Rhode Island, Geotechnical North Carolina, Geotechnical Massachusetts, Geotechnical Georgia, Geotechnical South Carolina|0 Comments

What is a Cone Test? If you want to know the basics, start here

A Cone Penetration Test (CPT) also referred to more informally as a Cone Test, is a way to get at subsurface information without having to directly sample the subsurface. Many organizations that order drilling services are also using CPT within their operations. CPT testing services is a good support option to well drilling services, since many of the potential customers and skills overlap. What is Cone Penetration Testing? Cone Penetration Testing (CPT) is the practice of using an ASTM standard hardened cone shape that is directly pushed into the ground to substantial depths. The cone is pushed using steel rods that are able to be connected to each other in 1 meter lengths as the depth increases. A powerful hydraulic ram is used to generate a substantial amount of downward force to enable the cone to penetrate soils, sand, clay and sometimes even soft rock. In order to keep the surface equipment (truck) in place and not simply be lifted up by the ram force, the vehicles that the CPT equipment is mounted on or in are typically quite heavy. Also, the use of anchor systems to the ground will increase the ability of any vehicle mounted CPT system to push harder and therefore deeper. There are a couple of different imperative goals to any subsurface investigation. The first one is the nature and sequence of strata or soil,sediments and other geological subsurface features. Using CPT for this is called geo-technical testing. In addition, the groundwater conditions can be established during a sounding. CPT can be used to determine: the composition, strength and distribution of subsurface soils. These can range from clay, sand, bedrock, groundwater table, hydrocarbons, contaminants and more. Advantages of CPT There are many different advantages to Cone Penetration Testing (CPT), including, prompt collection and interpretation of field [...]

By smadi66|December 5th, 2019|Geotechnical Rhode Island, Geotechnical South Carolina, Geotechnical South Dakota, Geotechnical Tennessee, Geotechnical Ohio, Geotechnical Pennsylvania, Geotechnical North Carolina, Introductory, Geotechnical North Dakota, Geotechnical Oklahoma, Geotechnical Oregon|0 Comments