摘要
岩石受载破裂过程中能量不断积累和释放,而岩石材料非均质性等细观组构特征对其破裂产生的声发射具有显著影响.通过岩石力学试验建立不同非均质、非均匀岩石强度和能量参数的评价方法,分析了不同非均质性岩石的声发射特征与应力状态和能量水平之间的关系.研究表明:岩石在不同应力阶段有不同强度的成分发生破裂,不同应力水平所产生的声发射信号由不同成分的破裂所致;岩石破裂损伤后,剩余能量与总能量、能量降有关,声发射监测到的弹性波能量是能量降的一部分,此能量降与应力状态及材料特性有关;将粉砂岩细分为均质且均匀、不均质而均匀、不均质且不均匀三类,不同非均质、非均匀程度的岩石在不同应力状态下破裂及能量释放情况不同,其中均质且均匀的岩石强度和蓄能水平最高.建立的基于声发射的应力状态和能量水平判别理论可应用于工程中微震监测数据分析,为识别矿山开采过程中区域煤岩体临界状态与超前预警提供了理论基础.
The energy is continuously accumulated and released during the process of rock fracture under load.And the meso-fabric characteristics of rock materials,such as inhomogeneity,have significant effects on the acoustic emission generated by fracture.The evaluation methods of strength and energy parameters of different heterogeneous and inhomogeneous rocks were established by rock mechanics test,and the relationship between acoustic emission characteristics and stress state and energy background of different heterogeneous rocks was analyzed.The results show that:The rocks have different strength components ruptured at different stress stages,and the acoustic emission signals generated by different stress levels are caused by the rupture of different components.After the rupture damage of rocks,the residual energy is related to the total energy and energy drop.The elastic wave energy monitored by acoustic emission is the main part of the energy drop,which is related to the stress state and material properties.The siltstones are divided into three categories:homogeneous and uniform,heterogeneous but uniform,heterogeneous and inhomogeneous.The rock with different heterogeneous and inhomogeneous has different fracture and energy release at different stress states,among which homogeneous and uniform rock has the highest strength and energy storage level.The theory of stress state and energy background discrimination based on acoustic emission can be applied to the analysis of microseismic monitoring data in engineering,which provides a theoretical basis for identifying the critical state of rock masses in the mining process and early warning.
作者
纪洪广
张春瑞
张月征
陈东升
韩童
陈洋
田竹华
JI Hongguang;ZHANG Chunrui;ZHANG Yuezheng;CHEN Dongsheng;HAN Tong;CHEN Yang;TIAN Zhuhua(Beijing Key Laboratory of Urban Underground Space Engineering,University of Science and Technology Beijing,Beijing 100083,China;National Engineering Research Center of Deep Shaft Construction,Beijing 100013,China;Shandong Energy Group Co.,Ltd.,Research Center for Rock Burst Prevention and Control,Jinan,Shandong 250014,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2024年第2期211-223,共13页
Journal of China University of Mining & Technology
基金
国家重点研发计划项目(2023YFC2907403)
山东省重大科技创新工程项目(2019SDZY02,2019SDZY05)。
关键词
矿山岩石力学
声发射
破裂过程
应力阶段
临界状态
能量水平
mining rock mechanics
acoustic emission
rupture process
stress stage
critical state
energy level
