交通荷载引起的静偏应力对饱和软粘土变形影响

为了研究交通荷载引起的静偏应力对饱和软粘土变形的影响，设计了室内不排水动三轴试验，将交通荷载简化为静偏应力与正弦荷载的叠加，依据实验数据分析了土体的塑性变形发展规律，给出了不同静偏应力下土体的转折应变-破坏振次的半对数关系曲线，研究了静偏应力对该曲线的影响规律。研究表明，静偏应力越大，土体变形发展越快，相同条件下达到转折应变时所需的破坏振次越小；静偏应力越大，转折应变-破坏振次关系曲线的斜率越小，截距则比较接近。

Effect of traffic loading induced static deviator stress on deformation of saturated soft clay

In order to study the effect of traffic loading induced static deviator stress on the deformation of saturated soft clay, an undrained dynamic triaxial test is designed. The traffic loading is simplified as sine wave plus static deviator stress. And the rule of plastic deformation development is analyzed based on the examination data. The semilog plot of turning strain against failure vibration is presented and the influence of static deviator stress on it is studied. It is found that the bigger the static deviator stress is, the faster the deformation develops and the fewer cycles are needed to achieve the turning strain. The slopes curves of turning strain against failure vibration decrease and the intercepts are close when the static deviator stress incereases.