关键词: 花岗岩残积土, 动应力, 累积变形, 循环荷载, pH值

Abstract: Indoor cyclic loading test was performed on residual soil of granite with varied pH value to obtain the dynamic stress response and the influence of pH value on it under cyclic loading. The dynamic stress response was measured by stress meters embedded in the specimens. Results illustrated that the dynamic stress response and cumulative deformation both increased with the proceeding of cyclic loading. The peak stress of dynamic stress response within acid or alkali treated specimens increased significantly during loading. After unloading, the residual stress of alkali treated samples also increased; with the increase of alkalinity, the increment of peak stress and residual stress augmented. The dynamic stress response and deformation response of alkaline samples were greater than those of acidic and non-treated samples. The additional stress within soil lagged behind strain, and the strain lagged behind the external load. The pH value had great influence on the dynamic stress response of granite residual soil, and therefore should be paid attention to in practical engineering.

Key words: granite residual soil, dynamic stress, cumulative deformation, cyclic loading, pH value