砂土孔隙压力影响因素的试验研究

Experimental study on factors affecting pore pressure of sand

在实际工程中,地下水位变化所引起的孔隙压力变化有时会引起土体沉降等一系列问题,且不同粒径与级配的土体所受孔隙压力会有所不同。为了更好地利用土体孔隙压力解决工程问题,掌握土体中孔隙压力的变化规律和影响因素,利用自行设计制作的试验装置在室内外进行了三次试验,得到了不同粒径与级配土体孔隙压力的时程变化曲线。结果表明,土体孔隙压力会随着地下水位的变化而改变,不同粒径与级配的土体孔隙压力峰值有所不同。该研究可为不同地质环境的工程施工提供依据。

The changes in pore pressure caused by changes in groundwater level sometimes bring a series of problems such as soil settlement in actual engineering,and the pore pressures of soil with different particle sizes and gradations will be different.In order to make better use of the pore pressure of soil to solve engineering problems,and to grasp the changing rules and influencing factors of the pore pressure of soil,three experiments indoors and outdoors were conducted using the experimental device designed and manufactured by the research group,and the time-history curves of the pore pressures of soil with different particle sizes and gradation were obtained.The test results show that the pore pressure of soil changes with the groundwater levels,and the peak value of the pore pressure of soil with different particle sizes and gradations are different,which provides a basis for engineering construction in different geological environments.