含水量对原状残积土初始基质吸力影响的试验研究

Experimental Research on Influences of Water Content on the Initial Matric Suction of Original State Residual Soil

以福建省降雨滑坡带的残积土为研究对象,制备原状三轴试样并控制5种不同含水量状态.利用GDS三轴试验系统测定试样的初始基质吸力,分别得出初始基质吸力随时间的变化曲线和初始基质吸力与含水量的关系曲线.试验结果表明:原状残积土的初始基质吸力在开始阶段随时间的增加逐渐上升至峰值,然后随着时间的进一步增加,曲线逐渐下降,最后趋于一个稳定值;原状残积土试样含水量越大,初始基质吸力越小.

Taking the residual soil in the rainfall-landslide zone in Fujian Province as the research object, we prepared original state triaxial samples and controlled 5 different states of water content. Using GDS triaxial test system to measure the initial matrie suction, we obtained the curves of initial matric suction with the time variation and the relation curve between the initial matric suction and the water content. Experimental results show that the initial matric suction of original state residual soil rises to a peak with the increase of time at the initial stage, then begins to fall, and at last, the initial matric suction tends to be stable, and the more the water content in the sample of the original state residual soil, the smaller the initial suction matrie suction.