大面积承载下黄土力学特性试验研究  

Experimental Study on Mechanical Properties of Loess Under Large Area Bearing

作　　者：费晓欧 缪海宾[2,3] 王建国 

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]辽宁工程技术大学,辽宁阜新123000 [3]煤科集团沈阳研究院有限公司,辽宁抚顺113122

出　　处：《煤矿安全》2016年第12期16-18,22,共4页Safety in Coal Mines

基　　金：国家自然科学基金面上资助项目(50774046);国家自然科学基金煤炭联合基金资助项目(U1361211)

摘　　要：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。The experiments of dissipation of pore pressure and different water content were taken to study the failure mechanism of loess basement under large area bearing in open pit dump. The results show that the shear strength of loess decreases with the increase of water content,and the change of water content and cohesion is a logarithmic linear relationship; the shearing stress decreases obviously with the increase of shearing rate. Moreover,the dissipation of loess pore pressure decreases with the increase of confining pressure;the dissipation coefficient increases with the increase of water content and its brittle failure is in low confining pressure. The results have been effectively applied in dump of Antaibao and Heidaigou coal mines for slope control,which has produced good economic and social benefits.

关 键 词：大面积承载 含水率 孔隙压力 消散 排土场 黄土力学特性 

分 类 号：TD824.8[矿业工程—煤矿开采]