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Geotechnical In Situ Specialty Testing (GIST) is a collaboration between Sanborn, Head & Associates, Inc. (SHA) and the University of New Hampshire (UNH) to provide high quality in situ soil testing for your challenging subsurface projects. These test methods are particularly valuable for obtaining accurate and reliable geologic profiling, strength and deformation data on soft and loose soils, and for acquiring rock mass properties. Our extensive experience of over 35 years with Self-Boring Pressuremeter (SBPM), Drilling Parameter Recorder (DPR), Dilatometer (DMT), Cone Penetrometer (CPT) and Field Vane (FVT) testing can get you the critical soil parameters required to meet your project needs. Using our technical expertise we can help develop the field investigation program best suited for your unique project. Having the right soil parameters will allow you to optimize your designs, saving you and your clients money and time.
Key personnel at SHA have over 15 years of experience with GIST ranging from SBPM to DPR projects. Combined with the University of New Hampshire’s (UNH) 35 years of experience allows us to focus on a practical approach to unique geotechnical challenges. UNH is the State's flagship public institution and is located in Durham, NH. UNH’s Department of Civil Engineering has approximately 500 undergraduate and graduate students and is home to the geotechnical engineering program.
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“…using the drilling parameter recorder system allowed us to better understand the engineering properties of the rockmass, resulting in a savings of $500,000 in foundation costs and in construction.”
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Applications and Soil Parameters
The self-boring pressuremeter (SBPM) is a long cylindrical probe that tunnels itself into the ground to minimize soil disturbance resulting in very high quality data in difficult soils. SPBM is one of the best tools for evaluating in situ horizontal stresses.
Drilling parameter recorder (DPR) is a computerized system which monitors sensors installed on standard drilling equipment to record information on the drilling process. Geologic profiling and engineering properties can be interpreted from this data.
The flat plate dilatometer (DMT) has proven over the years to provide high quality data for several soil types. The numerous engineering properties obtained for this test can be used to estimate settlement, design piles and much more.
The field vane (FVT) test has a long history of providing a reliable and accurate profile of undrained shear strength and sensitivity of saturated cohesive soils.
The cone penetrometer (CPT) is a widely used tool to rapidly obtain a near continuous profile of reliable subsurface conditions and engineering soil properties.
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Kevin P. Stetson, P.E.
Sanborn, Head & Associates, Inc.
kstetson@sanbornhead.com
Kevin has over 15 years of experience in geotechnical in situ specialty testing and has been with SHA since 2001. He received his B.S. and M.S. degrees in civil engineering from UNH and is a licensed Professional Engineer. Kevin designed, built and tested an instrumented dilatometer for his thesis research which required instrumenting a dilatometer to measure the complete stress/strain curve and pore pressure along with thrust during insertion. He has published multiple papers and has extensive experience in subsurface exploration programs including conventional soil borings, bedrock coring, in situ testing using the Dilatometer (DMT), self-boring pressuremeter (SBPM), Drilling Parameter Recorder (DPR) and field vane (FVT) tests, and instrumentation. His engineering experience includes the design and construction observation of shallow and deep foundations, ground improvement methods, retaining wall systems, and earthen dams.
Professor Jean Benoît, Ph.D.
University of New Hampshire
jean.benoit@unh.edu
Professor Jean Benoît has been involved in drilling, sampling and in situ testing starting more than 35 years ago on hydroelectric projects in Eastern Canada. His research and consulting work has been conducted throughout the US as well as France, Italy, Egypt, Iran and Algeria. Some examples of projects include the Central Artery in Boston, Olmsted Locks and Dam project in Illinois, the Loire River in France and the Leaning Tower of Pisa in Italy. Other activities include co-founding and management of the National Geotechnical Experimentation Sites (NGES) program and task leader for an international system for archiving and web disseminating of geotechnical data. Professor Benoît has published over 75 technical papers related to geotechnical engineering. Professor Benoît received his B.S. in Civil Engineering from École Polytechnique in Montréal in 1977 and his M.S. and Doctorate in Civil Engineering from Stanford University in 1980 and 1984, respectively. His past experience includes work as a geotechnical engineer for Woodward-Clyde Consultants.
Stan S. Sadkowski, P.E.
Sanborn, Head & Associates, Inc.
ssadkowski@sanbornhead.com
Stan has over 8 years of experience in geotechnical in situ specialty testing and has been with SHA since 2004. Stan received his B.S. and M.S. degrees in civil engineering from the UNH and is a licensed Professional Engineer in NH, VT, and MA. Stan has published multiple papers and has extensive experience using Drilling Parameter Recorders (DPR) for a variety of projects ranging from deep foundation solutions to fracture characterization for in situ environmental remediation. He also has extensive experience in subsurface exploration programs including conventional soil borings, bedrock coring, as well as the Dilatometer (DMT) and field vane (FVT) tests. His engineering experience includes the design and construction observation of a variety of foundation systems, ground improvement evaluations, design of earth support systems, and hydraulic and hydrologic evaluations of dams.
Click Here to View Selected Publications
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