Determination Of In Situ Vsubscript S And Gsubscript Max Using Surface Wave Measurements In Cased And Uncased Boreholes

Author : ME. Kalinski
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)

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Download or read book Borehole SASW Testing to Evaluate Log(Gmax) - Log(?') Relationships in Situ written by ME. Kalinski and published by . This book was released on 1999 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method is being developed for the in-situ measurement of shear wave velocity, Vs, in the soil surrounding a borehole. The method involves the measurement of axially propagating surface waves inside an uncased borehole using the Spectral-Analysis-of-Surface-Waves (SASW) approach. Testing is performed with instrumentation housed inside an inflatable tool. Inflation pressures applied by the tool are used to vary radial stresses in the soil surrounding the borehole. Surface wave velocities over a range of frequencies are measured at each inflation pressure. These measurements are then theoretically modeled so that the variation in Vs (and hence small-strain shear modulus, Gmax) with distance behind the borehole wall is determined at each pressure. The results of field tests with the borehole SASW tool at two sites composed of unsaturated clayey soils are presented. These results are compared with independent field seismic measurements and with laboratory tests on intact specimens using the torsional resonant column to assess the validity of the new field method.