Abstract:

To simulate the complicated stress path, such as multi-directional stress and principal stress axis rotation induced by earthquake shaking, ocean wave or traffic loading, a hollow cylinder apparatus (HCA) with dynamic triaxial and torsional shear capability was designed cooperatively with GDS company. The working principle of the apparatus is introduced. Comparisons of the test results are made between the traditional dynamic triaxial device and the hollow cyclinder apparatus. Five series dynamic stress paths and a seismic record are designed and applied to evaluate the performing of the new apparatus. The deviation from the specified loading stress would be minimized as a sutiable parameter, which could be adjusted in the software, is chosen. The testing results show that the HCA is a good instrument to investigate dynamic constitutive model under complex stress conditions.

Key words: dynamic soil tests, hollow cylinder apparatus, dynamic stress path