为了研究大面积承载下露天煤矿排土场黄土基底破坏机理,对某矿排土场基底黄土进行了孔隙压力消散、不同含水率等力学特性试验研究。结果表明:黄土剪切强度随着含水率增加而大幅度下降,含水率与黏聚力的变化呈对数线性关系;黄土剪应力也随着剪切速率的增大而发生明显的降低;黄土孔隙水压力消散度随围压的增大而减小,消散系数随含水率的增大而增大,且呈现低围压脆化破坏现象。该试验成果在安太堡矿及黑岱沟等露天矿的排土场边坡治理中得到了合理有效地应用,并产生了良好的经济效益和社会效益。 In order to study the failure mechanism of the loess foundation in the open-pit coal mine dump under a large area, experimental study on the mechanical properties of the loess base in a dump site was conducted with pore pressure dissipation and different water contents. The results show that the shear strength of loess decreases with the increase of water content, and the logarithmically linear relationship between water content and cohesion changes. The shear stress of loess also decreases obviously with the increase of shear rate. The dissipation of pore water pressure decreases with the increase of confining pressure. The dissipation coefficient increases with the increase of moisture content, and shows the phenomenon of low confining pressure embrittlement. The results of this experiment have been applied reasonably and effectively in the dump site slope control of the open pit mines such as Antaibao Mine and Heidaigou, and have produced good economic and social benefits.