Sarathy Geotech & Engineering Services Pvt Ltd.’s Post

Geological investigations Geological investigations concern the analysis of the composition and structure of the earth, whether natural or human-made. For example, during the design and delivery of construction engineering projects, the variable or unknown condition of the ground can pose risks both technically and financially. Consequently, geological, or geotechnical investigations offer a way to quantify ground conditions at various stages of such projects. Initial studies for a project may include a recce of potential project sites and their underlying ground conditions. While a more detailed review of the selected location can help determine the development requirements. During construction, ongoing investigations can qualify earlier findings or provide additional information. GPR can play an active role in each of these scenarios, including the ongoing management and maintenance of project assets upon completion. Why use GPR for geological investigations? As a near-surface geophysical technique, GPR in non-intrusive and non-destructive and offers the best resolution in the near-surface compared to other geophysical methods. For that reason, GPR is a popular choice for ground investigations, and under optimum conditions, GPR can work to depths of 15 – 50 m or more. GPR can see into the structure of the ground to provide accurate information concerning the depth to subsurface features, objects, as well as the interfaces between contrasting geological layers. This ability enables the mapping of layer boundaries to determine their thickness and to spot anomalies associated with subsidence or erosion, which could indicate the formation of cavities or problematic sinkholes as well as risk-zones for landslides. Compared to other geophysical methods, the deployment of GPR is typically quicker, more straightforward, and lower cost. #impulseradar #geological #gpr #groundpenetratingradar #georadar

Application of MASW and ERT methods for geotechnical site characterization: A case study for roads construction and infrastructure assessment in Abu Dhabi, UAE. Journal of Applied Geophysics.

#SoilScience_Quotations #Question_Answer Can you explain the process of conducting a site assessment and geotechnical investigation? Conducting a site assessment and geotechnical investigation involves several steps. First, we need to gather information about the site, such as its location, topography, and any available geologic maps or reports. Then, we conduct fieldwork, which includes drilling boreholes, collecting soil samples, and performing in-situ tests like Standard Penetration Test (SPT) or Cone Penetration Test (CPT). These tests help us determine the soil properties and subsurface conditions. We also assess any potential construction challenges, such as slope stability or groundwater issues. Finally, we analyze the collected data and prepare a geotechnical report that provides recommendations for foundation design and construction methods. This process is crucial to ensure the safety and integrity of any construction project. By understanding the site's geotechnical characteristics, we can make informed decisions and mitigate potential risks. #geotechnicalengineering #earthworks #engineering #soilmechanics #soilstabilization #soiltesting #geomembrane #geosynthetics #geophysical

A glimpse of Sesimic Cross-Hole Test from our recent project. What is the Seismic Cross-Hole Test? The Seismic Cross-Hole Test is a highly accurate method used to determine the shear and compressional wave velocities of soil and rock. This information is crucial for assessing the dynamic properties of the subsurface materials, which directly impact the design and safety of structures, especially in seismically active regions. Key Benefits: 📍 High Accuracy: Provides precise measurements of shear and compressional wave velocities. 📍 In-Depth Analysis: Offers detailed insight into the subsurface's dynamic properties. 📍 Safety Assurance: Enhances the safety and stability of structures by informing seismic design parameters. Ready to ensure your projects are built on a solid and safe foundation? Connect with us to learn more about how the Seismic Cross-Hole Test can benefit your next project. Connect with us: +91 9844875900 Partha Sarathi Parhi, Ph.D., Purushothaman A, Sarathy Geotech & Engineering Services Pvt Ltd. Visit us: www.sarathygeotech.com #GeotechnicalEngineering #SeismicTesting #ConstructionSafety #SarathyGeotech #EngineeringExcellence #geophysical

#SoilScience_Quotations #Question_Answer What are some common challenges you may encounter during geotechnical investigations? During geotechnical investigations, we may encounter several challenges that require careful consideration. One common challenge is dealing with difficult soil conditions, such as highly cohesive or expansive soils, which can significantly impact foundation design. Another challenge is assessing the presence of groundwater and its effect on the stability of excavations or foundations. Additionally, investigating sites with limited access or in remote locations can pose logistical challenges for drilling and fieldwork. Furthermore, encountering unexpected subsurface conditions, such as buried debris or old foundations, can complicate the investigation process. It's important to approach these challenges with a systematic and adaptable approach, utilizing appropriate testing methods and techniques to accurately evaluate the site's geotechnical properties. #geotechnicalengineering #earthworks #engineering #soilmechanics #soilstabilization #soiltesting #geomembrane #geosynthetics #geophysical

* Electrical resistivity survey for groundwater investigations and shallow subsurface evaluation of the basaltic-greenstone formation of the urban Bulawayo aquifer: https://lnkd.in/duPfwJXQ Abstract Electrical resistivity surveying methods have been widely used to determine the thickness and resistivity of layered media for the purpose of assessing groundwater potential and siting boreholes in fractured unconfined aquifers. Traditionally, this has been done using one-dimensional (1D) vertical electrical sounding (VES) surveys. However, 1D VES surveys only model layered structures of the subsurface and do not provide comprehensive information for interpreting the structure and extent of subsurface hydro-geological features. As such the incorporation of two-dimensional (2D) geophysical techniques for groundwater prospecting has often been used to provide a more detailed interpretation of the subsurface hydro-geological features from which potential sites for successful borehole location are identified. In this study, 2D electrical resistivity tomography was combined with 1D VES to produce a subsurface resistivity model for assessing the availability of groundwater in the basaltic-greenstone formation of the Matsheumhlope well field in Bulawayo, Zimbabwe. Low resistivity readings (<50 Ωm) towards the central region of the study area suggest a high groundwater potential, while high resistivities (>500 Ωm) around the western margin of the study area suggests a low groundwater potential. 2D electrical resistivity surveys provide a more detailed subsurface structure and may assist in identifying the configuration of possible fractures which could conduct groundwater into the shallow subsurface of study area. It is concluded that 2D electrical resistivity methods is an effective tool for assessing the availability of groundwater in the highly weathered and fractured basaltic greenstone rocks. The methods provided a more precise hydro-geophysical model for the study area compared to the traditional VES. Results from this study are useful for technical groundwater management as they clearly identified suitable borehole locations for long term groundwater prospecting.

Designing and constructing reliable foundations and infrastructure requires a thorough understanding of soil, rock, and groundwater conditions. Through Terracon’s nationwide network of #geotechnical professionals, access to more than 50 years of historical subsurface exploration data from thousands of locations across the country, and GIS-enabled geology mapping, we can accurately anticipate ground conditions and develop an intelligent, safe work plan. Use the link below to learn about Terracon’s #Stage1PredictiveAnalysis, #SubsurfaceExploration, #LaboratoryTesting, and #GeostructuralDesignandInstrumentation services. #ExploreWithUs 

Our company uses multi-channel seismic refraction tomography and MASW, multi-channel ERT/Resistivity/IP methods to better determine rock and soil conditions at dam sites. Thus, it is able to reveal the rock and ground conditions in better and more detailed and to calculate and map all the ground mechanic parameters that will be required during the construction phase in more detail. If you are going to build a dam, a detailed investigation of the ground in advance will provide information about many problems that will be encountered during construction or during its use. These problems are usually weak zones in the ground, counter melting voids, faults, landslides, slope shifts, water retention and seepage. We strongly emphasize the need for geologists and geophysicists to solve these problems in cooperation and consensus.        It is very important to determine the rock and soil conditions of large engineering structures such as dams by preliminary geotechnical studies. In this study, it was tried to obtain information about the stability and geometry of the underground formations in the area selected as the dam site. For this purpose, High Resolution Seismic Refraction Tomography (HR-SRT), one of the geophysical methods, was used in this field. Before starting seismic data acquisition, field parameter tests were performed to determine the geophone (receiver) spacing, shot point interval and charge quantity. According to the results of the parameter tests, it was decided to use 300 active channels, geophone spacing of 2.5 m, shot interval of 5 m, explosive charge of 250 g and blasting depth of 2 m. After acquiring seismic data on the dam axis of the study area, detailed P velocity distribution value was determined by performing multi-iteration tomographic inverse solutions. In addition, RQD values were determined by taking foundation borehole core samples at locations with weak zones determined by HR seismic refraction tomography on the dam axis. It was observed that the RQD values were compatible with the seismic refraction tomography in the previously determined weak zones.

What is Seismic Reflection? Seismic reflection is a geophysical technique for studying subsurface Earth layers. It entails sending seismic waves into the ground and recording their reflections off underground rock formations. These reflections are analyzed to create images revealing geological structures and crust composition. Geophones placed on the ground record these reflections, and data undergo processing techniques like time-to-depth conversion, migration, and stacking to generate detailed subsurface images. Seismic reflection is crucial in oil and gas exploration, civil engineering projects such as tunneling, dam construction, and bridge building. It also aids in seismic monitoring and understanding crustal structures in earthquake-prone areas. Applications in Geotechnical Engineering: 1️⃣ Site Characterization: They provide essential information about subsurface structures, aiding in assessing site suitability for construction projects. 2️⃣ Foundation Design: By identifying hazards like soft soils or bedrock variations, seismic reflection surveys help engineers design stable foundations capable of withstanding ground movements. 3️⃣ Tunneling and Excavation: These surveys offer insights into geological conditions along tunnels, enabling engineers to anticipate challenges and ensure safety during excavation. 4️⃣ Earthquake Hazard Assessment: Seismic reflection data aids in mapping fault structures, assessing earthquake risks, and developing mitigation strategies. 5️⃣ Slope Stability Analysis: They help identify subsurface weaknesses, contributing to slope stabilization and reducing landslide risks in geotechnical projects. Video by OMV (https://lnkd.in/eag7pNR7) #SeismicReflection #GeophysicalEngineering #SiteCharacterization #FoundationDesign #TunnelingEngineering #EarthquakeAssessment #SlopeStabilityAnalysis #GeotechnicalSurvey #CivilEngineering #Geophysics #SubsurfaceImaging

WHAT IS SEISMIC SURVEY IN GEOTECHNICAL WORK? A seismic survey is a geophysical method used in geotechnical engineering to investigate the subsurface structure and properties of the Earth. It involves the generation and detection of seismic waves, which are acoustic waves that travel through the ground. Seismic surveys are commonly employed to determine the composition, layering, and other characteristics of the subsurface, providing valuable information for engineering and construction projects. Seismic surveys provide a non-invasive and efficient means of obtaining subsurface information, making them valuable tools in geotechnical investigations for infrastructure projects, environmental studies, and resource exploration. Attention to all geophysicist and geotechnical sectors out there, eager to deepen your knowledge in geophysics and geotechnical engineering? Look no further! Join our upcoming online workshop course designed exclusively for geophysicists and experts in geotechnical field! The details of the workshop are as follows: Online Workshop Course: Geophysics Application in Geotechnical Work Date: January 4th, 2024 (Thursday) Time: 9.00 am – 5.00 pm Venue: Online Zoom Application *subject to change Register now and book your seat! Click link below for more details for the workshop https://lnkd.in/gYWAK2gH To register, click link below: https://lnkd.in/gZfURdnh Don’t forget to register and join our workshop to gain more knowledge on geophysics application in geotechnical work! #gex #academygex #jeoxplorer #geologist #theorytoreality #geophysical #geotechnical #siteinvestigation #training #workshop #skill #refreshknowledge #exchangeidea