饱和砂砾土动孔压发展规律试验研究

Experimental Study of the Law of Development of Pore Pressure of Saturated Gravel Soil

采用多功能振动三轴仪对饱和砂砾土进行室内动三轴试验,分析不同试验条件下饱和砂砾土动孔压的变化规律,试验结果表明:在同一固结压力条件下,随着动应力幅值的增大,孔压比的上升速率增大,经过一段时间后最终的孔压比达到一定值;在同一固结压力和动应力幅值条件下,随着固结应力比的增大,孔压比的上升速率逐步减小,达到相同的孔压比时所需的振动次数也逐步增加。

The saturated sand soil is experimented on the indoor dynamic triaxial test by the multifunctional vibration triaxial apparatus. It is analyzed of the saturated sand soil under different test conditions. The dynamic pore pressure test results show that,under the condition of the same consolidation pressure,with the increment of dynamic stress amplitude,the increased rate of pore pressure ratio increase,after a period of time the final pore pressure ratio reaches a certain value. In the same consolidation pressure and the dynamic stress amplitude condition,with the increase of consolidation stress ratio,the pore pressure ratio increase rate gradually decreases,when achieving the same pore pressure,the vibration frequency is also gradually to increase.