不同围压下饱和砂土不排水循环扭剪试验研究

利用河海大学与日本圆井株式会社共同研制的一种新型的多功能静动三轴仪进行了不排水循环扭剪试验。通过对空心圆柱体试样的动力扭剪不排水试验研究了相同相对密度在不同固结围压下的动力不排水响应。试验初步研究了通过用初始有效平均正应力归一化的有效应力路径，归一化有效应力路径有很好的一致性。如果保持相同的剪应力比，由初始有效平均正应力归一化的有效应力路径不受初始有效平均正应力的影响。

Undrained cyclical torsional shear tests on saturated sand in different confining pressures

Tests with the static-dynamic dual purpose triaxial compression test apparatus which was manufactured by Hohai University and Japan Round Well Company have been completed. Through the dynamic torsional shear undrained tests on empty heart column body samples, the dynamic undrained response of the same relative density in different consolidation confining pressures is known. Effect of initial mean effective stress on the behavior is examined by tests under undrained cyclic loading at several initial confining stresses with the same stress rations. The results indicate that the stress path is not affected by changing the initial effective mean stress if the shear stress ratio remains the same.