循环扰动和高温作用下砂岩的岩爆倾向性及破坏特征研究  

Rockburst tendency and failure characteristics of sandstone under cyclic disturbance and high temperature

作　　者：张平[1,2] 任松[1,2] 张闯[1,2] 吴斐[1,2] 隆能增 李凯鑫 ZHANG Ping;REN Song;ZHANG Chuang;WU Fei;LONG Neng-zeng;LI Kai-xin(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;College of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学资源与安全学院,重庆400044

出　　处：《岩土力学》2023年第3期771-783,共13页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.52074048)。

摘　　要：为了揭示循环扰动和高温影响下砂岩的岩爆机制,开展了循环扰动和高温作用下砂岩单轴压缩试验和CT扫描试验,研究了不同条件下砂岩的力学特性、岩爆倾向性及破坏特征,探讨了岩爆倾向性与破坏特征的关系。研究结果表明:循环扰动和高温对砂岩的力学性能及岩爆倾向性影响效果显著;无循环扰动砂岩的单轴抗压强度、弹性模量及岩爆倾向性随温度的升高呈先增加后降低的趋势,200℃为该类砂岩的阈值温度,受循环扰动砂岩的力学特性及岩爆倾向性随温度的上升而降低;而砂岩的力学特性及岩爆倾向性随循环应力幅值增加而下降;随着循环应力幅值和温度的增加,砂岩破坏模式由劈裂破坏向剪切破坏转变,同时砂岩的岩爆倾向性与裂隙三维分形维数呈良好的负相关关系;此外,高温对砂岩的力学性能、岩爆倾向性及破坏程度影响效果强于循环扰动。研究结果可为高温工程岩爆防治提供理论依据和工程参考价值。This paper aims to reveal the rockburst mechanism of sandstone under cyclic disturbance and high temperature.The uniaxial compression tests and CT scan tests on sandstone after different cyclic amplitudes and temperatures were conducted to investigate the mechanical properties,rockburst tendency and failure characteristics of sandstone specimens.The rockburst tendency and failure characteristics of specimen were analyzed.Results showed that the effects of high temperature and cyclic disturbance on the mechanical properties and rockburst tendency of sandstone were significant.The compressive strength,elastic modulus and rockburst tendency of specimens without cyclic disturbances tended to first increase and then decrease as temperature increased,and the threshold temperature was 200℃;while those with cyclic disturbances decreased as temperature increased,and the mechanical properties and rockburst tendency of sandstone decreased with increasing the cyclic stress amplitude.The uniaxial compression failure mode shifted from splitting failure to shear failure with the increase of cyclic amplitude and temperature,and the rockburst tendency had a good negative relationship with the three-dimensional fractal dimension of fracture.In addition,the effect of high temperature on the mechanical properties,rockburst tendency and failure degree of sandstone was stronger than that of cyclic disturbance.The research results can provide theoretical basis and engineering reference for the prevention and control of rockburst in high temperature engineering.

关 键 词：循环扰动 高温 砂岩 力学特性 岩爆倾向性 破坏特征 

分 类 号：TU451[建筑科学—岩土工程]