冻结红砂岩力学特性试验研究  

Mechanical Characteristics of Frozen Red Sandstone

作　　者：单仁亮[1] 赵文峰[1] 宋立伟[1] 黄博[1] 魏龙飞[1] 吕进阳 肖禹航 

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：《煤矿开采》2014年第2期9-12,共4页Coal Mining Technology

基　　金：国家自然科学基金煤炭联合基金项目资助(U1261126);中央高校基本科研业务费专项基金项目资助(2010YL09)

摘　　要：为了研究梅林庙矿区红砂岩在冻结条件下的力学性质,对红砂岩试样分别进行了不同围压以及不同温度条件下的三轴力学特性试验。试验结果表明:围压和温度对于冻结岩石有着很明显的影响。在-15℃条件下红砂岩轴向抗压强度与围压呈线性增长关系,红砂岩仍然遵循莫尔-库伦强度准则,其黏聚力为11.99MPa,内摩擦角为33.7°。在围压为12MPa条件下红砂岩抗压强度与温度呈现二次曲线的关系,弹性模量与温度呈线性关系,而泊松比受温度的影响并不大。利用曲线拟合得出3种不同围压下强度与温度的关系式,从而为井筒科学掘进提供理论支撑。In order to research mechanical property of red sandstone collected from Meilinmiao mining area under freezing condition, 3-axial mechanical property test was made under different confining pressures and different temperature. Test results showed that confi- ning pressure and temperature influenced frozen rock obviously~ Uniaxial compression strength was linear with confining pressure at - 15℃. Red sandstone still follows Mohr-Coulomb criterion whose cohesion was ll. 99MPa and inner-friction angle was 33.7° . Compression strength was quadratic curve with temperature when confining pressure was 12MPa, elastic module was linear with tem- perature, and influence of temperature on Poisson ratio was small. The relationship formula of strength and temperature under 3 different confining pressures by curve matching, which could provide theoretical support for shaft driving.

关 键 词：冻结岩石 力学性质 围压 温度 

分 类 号：TD315[矿业工程—矿井建设]