高温后粗砂岩三轴抗压强度试验研究  

Test investigation of triaxial compressive strength of coarse sandstone after high temperature

作　　者：许崇帮[1] 周荷生 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]中咨工程有限公司,北京100048

出　　处：《岩石力学与工程学报》2016年第A01期2811-2818,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51278233);新疆建设兵团科技项目(2013–187);交通运输部公路科学研究所基金项目(2015–9033)~~

摘　　要：利用TUA2000A型超声波无损检测仪和RMT-150B型岩石力学伺服试验机，对高温度后粗砂岩波速、试件质量与三轴抗压强度进行了研究。研究表明：（1）波速随温度递增呈非线性降低，在400℃～800℃阶段波速降低幅度最大；（2）试件质量虽然随温度增加而减小，但试件质量减小有限，温度影响可以忽略；（3）高温后粗砂岩三轴抗压强度与围压呈线性关系，围压系数为常数，单轴抗压强度理论值受温度与围压影响；（4）高温后粗砂岩内摩擦角保持不变，其黏聚力受温度影响显著；（5）建立含有温度和围压阀值的粗砂岩三轴抗压强度公式，能够准确反映温度、围压对三轴抗压强度的影响。The mechanical property, specimen quality and wave velocity of coarse sandstone after different high temperature be test studied by the servo-controlled testing machine RMT- 150B and ultrasonic nondestructive testing instrument TUA2000A. The test results show that： （1） The wave velocity of rock is nonlinearity deducing with temperature increase, ranges of reduction of stage from 400℃ to 800 ℃ is the maximum. （2） Quality of specimens is deducing with temperature increase, the quality loss maximum is smaller, therefore, the effect of temperature on quality of specimens could be ignored. （3） It is still a strong liner relationship between the triaxial compressive strength and the confining pressure to coarse sandstone after high temperature, its confining coefficient is a constant, and the theoretical value of uniaxial compressive strength is expressed by the quadratic polynomial on temperature and confining pressure. （4） Its internal friction is a constant without change to high temperature, and the cohesive strength be controlled by high temperature. （5） The theoretical formula about triaxial compressive strength be established with the valve value of temperature and confining pressure, and it accurately reflects the relationship between the strength and temperature, confining pressure

关 键 词：岩石力学 粗砂岩 三轴抗压强度 力学特性 

分 类 号：TU45[建筑科学—岩土工程]