往返荷载作用下非饱和砂性土的液化强度和孔压规律

Liguefaction Strength and Pore Pressure Distribution of a Nonsaturated Sandy Soil under Cyclic Loading

使用电磁式动三轴仪对江油电厂粉煤灰进行了结返荷载下液化强度和孔压变化规律的试验研究．由不同制样方法得试样的Ｓｋｃｍｐｔｏｎ孔压系数Ｂ＝０．０５７～１．０．试验结果表明，在试验Ｂ值变化范围内，液化强度相差１倍多．孔压随Ｂ值减小升速率减慢．累积孔压也相应减小．当Ｂ减小到某一围内时，试样不再发生液化。同结主应力比Ｋｅ对液化强度和孔压变化也有较大影响．对孔压变化规律使用双曲线函数拟合得很好，便于应用和计算．

Electric-meganic dynamic triaxial devic was used tl study the liguefaction strength and pore pressure distribution of a nonsaturated sandy soil. Various sampling methods were made to get Skempton's, pore pressure ratio B=0. 057～1. 0. The results showed that within B aleave, the difference of the strength was two times. The pore pressure was slowly developed with B reducing. And after B went down to some zone, the liquefaction no longer occurred. The strength and pore pressure were obviously affected by the consolidated principal stress ratio. A mathamatical curve was used to match the pore pressure channge with the cyclic axial deformation.