先锋露天煤矿北帮膨胀性软岩含水率与抗剪强度的关系

摘要

本文对先锋露天煤矿北帮膨胀性软岩采取大量扰动土试样进行不同含水率下重塑土的各类剪切试验；对不同的浸水时间，不同含水率下，岩土体含水率与抗剪强度的变化规律进行了分析。发现岩土层抗剪强度在浸水状态下成倍下降，岩土体浸水对岩土体强度影响极大。场地地下水和地表水对边坡岩土体的浸润有软化作用，对边坡的稳定性起着控制作用，这也是北帮整体坡度虽很缓但仍滑移变形不断的原因。%This paper did sorts of shear strength tests in different moisture content conditions with amount of disturbed soil which was collected from the swelling soft rock in the north of xianfeng town open-cast coal. Furthermore, it analyzed the physical relationships between moisture content of the rock-soil mass and shear strength under different soaking time or different moisture content conditions. Finally, it find the shear strength of rock-soil mass drops along with the saturated degree of test specimen doubled and re-doubled. It got a conclusion that soaking of the rock-soil mass had a strong influence on the strength of rock-soil mass. The soaking of groundwater and surface water could soft the rock-soil mass, which plays an important role in controlling the stability of side slope, also in continuing slip deformation.