The stress-strain characteristics of soils at small strain are very important for analyzing the soil-structure interaction behavior. This study developed a set of high-resolution triaxial testing system to carry out a number of triaxial tests with capability of measuring small-strain stress-strain behavior of the Taipei silty clay and bender element tests to measure the shear modulus. Also the down-hole tests and cross-hole tests were conducted to measure in-situ shear modulus of soils. Testing results shows the Taipei silty clay displays highly non-linear behavior with high initial stiffness at small strain. The initial normalized stiffness from triaxial tests can reach the value as high as 2000-2500, which is very close to the results of bender element tests. Besides, the initial stiffness obtained from laboratory tests is significantly less than from in-situ seismic tests. The results may result from the effect of sampling disturbance, fabric and layering.
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