水位波动与荷载耦合作用下粉土强度特性试验研究

Laboratory Investigation on the Shear Strength Characteristics of Silt Under Coupling Effect of Changes in Groundwater Table and Vertical Load

针对我国近年来多发的由于地下水位变化引起建筑物沉降、滑坡、泥石流等地质灾害事故,通过室内模型试验模拟自然环境中建筑物地基范围内的地下水位上升下降的波动变化,选取第四纪全新统冲积层粉土为研究对象,分析地下水位波动、荷载作用以及不同含水率条件下粉土基地的力学指标值的变化。通过实验结果对比表明:在上部荷载作用下,粉土地基的强度指标值随着水位波动的次数和含水率的增加而降低。本次试验研究方法和结论供以后实际工程参考借鉴。

The resent studies had shown that the geological hazards such as the building subsidence, landslide and debris flow happened in PR China recently are mainly caused by the coupling effect of changes in groundwater table and vertical load. In order to understand the strength characteristics of the soil foundation, the experimental investigation has been conducted to simulate how the changes in water content and groundwater table fluctuation number will affect the shear strength characteristics （cohesion and friction angle） of silt foundation at two different loading levels （50kPa and 100kPa）. The laboratory direct shear test results had shown that, the soil shear strength decreases with the increase in the water table fluctuation number and the water content for each level of vertical loading. The methodology and result of this research can be used as a reference for future practices and researches.