绿泥岩冻结前后力学性质变化的点荷载试验研究  

Study on Point Load Test of Mechanics Property Variation Before and After Freezing of Green Mudstone

作　　者：单仁亮[1] 宋立伟[1] 黄宝龙[1] 赵文峰[1] 王二成[1] 传李京 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭工程》2014年第8期70-73,共4页Coal Engineering

基　　金：国家自然科学基金煤炭联合基金项目(U1261126)

摘　　要：对绿泥岩展开了常温点荷载试验,发现不规则岩块的试验结果与规则岩芯的径向点荷载试验结果相差不大,绿泥岩外形对其点荷载试验结果的影响很小。常温下绿泥岩属于较坚硬岩,饱水绿泥岩冻结以后抗压强度下降34.5%,为较软岩,饱水冻结对绿泥岩的强度影响很大。通过微观电镜扫描,发现绿泥岩存在大量孔洞和裂隙,因此饱水冻结后,由于水变成冰体积膨胀引起岩石内部结构的变化,导致岩石强度降低。A point load test with an ambient temperature was conducted on green mudstone. The test showed that there was no big difference between the test results of the irregular rock block and the radial point load test results of the regular rock core and the green mudstone shape would have a less influence to the point load test results. The green mudstone under an ambient temperature would be quite hard rock, the compressive strength after the saturated water green mudstone frozen would be reduced by 34. 5% and would be soft rock. A saturated water freezing would be highly affected to the strength of the green mudstone. With an electron microscope scanning, great number of holes and cracks existed in the green mudstone were found. After a saturated water frozen, due to water to ice, the volume swelled would cause a variation of the rock internal structure and the rock strength would be reduced.

关 键 词：绿泥岩 点荷载试验 冻结效应 抗压强度 电镜扫描试验 

分 类 号：TD315[矿业工程—矿井建设]