安太堡露天煤矿排土场基底黄土力学特性试验研究

Experimental study on the mechanical properties of the dump basement loess of Antaibao open-pit

为了研究黄土基底排土场破坏机理,对安太堡露天矿排土场基底黄土进行了孔隙压力消散(围压分别为100,200,300和400 kPa)、固结不排水剪(不同围压、三轴或剪切强度)和含水量力学特性试验研究,结果表明:基底黄土孔隙水压力消散度随围压的增大而减小,消散系数随含水量的增大而增大,且呈现低围压脆化破坏现象,土体剪切强度随着含水量的增加而大幅度下降。该试验成果在安太堡矿南排、西排,准格尔黑岱沟矿北排、西排及外排等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。

The experiment of dissipation of pore pressure（with different confining pressure of 100,200,300 and 400 kPa）,consolidation-undrained shear（with different confining pressure,triaxial or shearing strength） and water content were taken to study the failure mechanism of loess basement dump.The results show that the confining pressure increases but the dissipation spread of loess pore pressure decreases;the dissipation coefficient increases as the water content increases,and it brittle failure in low confining pressure.Moreover,the shearing strength of loess greatly decreases when the water content increases.The results were effectively applied in South Dump and West Dump of Antaibao open-pit,North Dump,West Dump and Outer Dump of Zhungeer Heidaigou open-pit for slope control,etc.,which produced good economic and social benefits.