干燥和饱水状态下砂质泥岩拉压变形破坏过程能量演化对比研究  

Contrastive analysis of energy evolution in the tension and compression deformation processes of dry and water-saturated sandy mudstone

作　　者：滕腾 王玉明 李召龙 高亚楠 朱笑颜 TENG Teng;WANG Yuming;LI Zhaolong;GAO Yanan;ZHU Xiaoyan(School of Energy and Mining Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijingg100083,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Huainan,Anhui 232001,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083 [3]深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001

出　　处：《采矿与安全工程学报》2023年第1期174-183,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52004285,52078477);中央高校基本科研业务费专项项目(2022JCCXXNY06);深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK2123);深部煤矿采动响应与灾害防控国家重点实验室开放基金项目(SKLMRDPC19KF06)。

摘　　要：岩石的损伤与破裂是能量释放的物理过程,研究岩石变形破坏过程中的能量演化规律对分析岩石破坏机理和预测岩土工程灾害具有重要意义。本文针对岩石的拉伸和压缩2种典型破坏形式,设计开展了巴西劈裂和单轴压缩试验,基于声发射能和变形归一化处理,量化了岩石拉/压变形损伤破坏过程,对比研究了砂质泥岩拉伸与压缩变形破坏过程中的能量演化规律,并分析了干燥和饱水状态对岩石拉/压破坏过程中能量演化的影响。结果表明:砂质泥岩压缩变形破坏过程中释放的声发射能总量大于拉伸变形破坏过程,干燥和饱水状态下压/拉声发射能总量的比值分别为1.6和8.6。砂质泥岩的拉伸与压缩变形破坏过程可分为初始损伤、损伤发育和损伤平寂3个阶段,但拉伸破坏的初始损伤阶段比压缩破坏增长30%,损伤发育阶段缩短50%,损伤量明显增大,损伤激增对应的变形增大。干燥砂质泥岩压缩变形破坏所需的输入能密度和所释放的耗散能密度均大于饱水岩样,耗散能所占总输入能的百分比不变。研究结果能够发展和完善岩体力学基础,并为矿山工程灾害防控提供参考。The damage and break of rock is the physical process of energy release,and study the law of energy evolution in the process of rock deformation and failure has significant effect on analyzing the mechanism of rock failure and predicting geotechnical disasters.This paper designed and carried out a series of Brazilian splitting and uniaxial compression tests on dry and water-saturated sandy mudstones to study the energy evolution in tension and compression deformation processes.The acoustic emission(AE)energy during tension and compression deformations was normalized to quantify and analyze the damage evolution.The law of energy evolution in the process of tension and compression deformation of sandy mudstone was then compared,and the influence of dry and saturated state of water on the energy evolution was analyzed.The results have shown that:The total amount of AE energy released in the process of compression deformation failure of sandy mudstone was greater than that in the tension deformation,and the ratio in dry and saturated state were 1.6 and 8.6,respectively.The tension and compression deformation failure processes of sandy mudstone could be divided into three stages which were initial damage,damage development and damage recovery.The initial damage stage in tension deformation increased by 30%compared with compression deformation while the damage development stage was shortened by 50%.The damage was significantly increased,and the corresponding deformation was increased.Input energy density and dissipated energy density required for dry sandy mudstone in compression deformation were larger than that in water-saturated samples,but the percent of dissipated energy in total input energy remained unchanged.The results can develop and perfect the foundation of rock mechanics,and provide reference for the prevention and control of coal mining disasters.

关 键 词：岩石力学 能量演化 拉/压变形破坏 损伤机制 声发射 

分 类 号：TU452[建筑科学—岩土工程]