冻结红砂岩力学特性试验研究.pdfVIP

学兔兔 第19卷 第2期 (总第117期) 煤 矿 开 采 Vo1．19No．2(Series No．117) 2014年4月 C0AL MINING TECHNOLOGY April 2014 冻结红砂岩力学特性试验研究 单仁亮，赵文峰，宋立伟，黄 博，魏龙飞，吕进阳，肖禹航 (中国矿业大学 (北京)力学与建筑工程学院，北京100083) [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。在一15~C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一库伦 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。 [关键词] 冻结岩石；力学性质；围压；温度 [中图分类号]TD315 [文献标识码]A [文章编号]1006-6225(2014)02—0009—04 Mechanical Characteristics of Frozen Red Sandstone SHAN Ren．1iang，ZHAO Wen—feng，SONG Li—wei，HUANG Bo，WEI Long-fei，LV Jin—yang，XIAO Yu—hang (1．Mechanics＆Architecture Engineering School，China University of Mining＆Technology(Beijing)，Beijing 100083，China) Abstract：In order to research mechanical property of red sandstone collected from Meilinmiao mining area under freezing condition， 3一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一 15oC．Red sandstone still follows Mohr．Coulomb criterion whose cohesion was 1 1．99MPa 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 eurve matching，which could pr