Abstract
The method of down-hole seismic surveying is described. This method was successfully used to a depth of 50 m in a cased borehole and these results are presented. The method may be used to find the in situ low strain shear modulus for use in theoretical response studies.Structural changes and changes in the stress state of samples usually result from sampling, handling, and testing procedures. Large changes in soil properties may result from these processes. An assessment of the change in soil properties is presented, which is of importance for the use of laboratory derived soil properties in theoretical in situ dynamic response studies.The magnitude of sample disturbance is assessed by comparing in situ and laboratory measured shear wave velocities. In situ down-hole shear wave velocities are compared with low strain (1 × 10−6) laboratory dynamic torsion test results. The large differences found may be correlated with the in situ shear wave velocity.A procedure is presented to correct the laboratory established shear modulus–strain relation–ship for the effects of sample disturbance. The adjusted laboratory curve is then suitable for use in theoretical response studies and will be a more accurate representation of the in situ deformation characteristics.
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