基于声发射的层状复合岩石损伤演化规律实验研究  

Experimental Study on Damage Evolution Law of Layered Composite Rock Based on Acoustic Emission

作　　者：付鹏 亓宪寅 王胜伟[1] 杨振 FU Peng;QI Xian-yin;WANG Sheng-wei;YANG Zhen(School of Urban Construction, Yangtze University, Jingzhou 434023, China;State Key Laboratory of Rock and Soil Mechanics and Engineering, Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China)

机构地区：[1]长江大学城市建设学院,荆州434023 [2]中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉430071

出　　处：《科学技术与工程》2022年第19期8431-8438,共8页Science Technology and Engineering

基　　金：湖北省自然科学基金(2020CFB367)。

摘　　要：为了研究层状复合岩石内部微观裂隙的损伤情况,采用单轴压缩试验,结合声发射分析仪对试件内部破坏过程进行实时监测,分析岩石的破坏过程、声发射的参数等力学特性。研究结果表明:层状复合岩石的破坏特征不是单一岩石破坏特征的直接相加,而是在荷载作用下耦合破坏的结果。强度高的硬岩可以约束强度低的软岩发生横向变形,而强度低的软岩对强度高的硬岩的横向变形具有推动作用;声发射的能量计数与复合岩石内部裂纹的压密、扩展、贯通过程有紧密联系,可以评估岩石内部的损伤程度;根据累计能量建立的损伤演化方程,其拟合数据与试验数据吻合较好,实现了用声发射能量计数反应层状复合岩石的损伤演化规律,为层状复合岩石的损伤研究提供了参考。In order to study the damage of microscopic cracks in the layered composite rock,the uniaxial compression test combined with the acoustic emission technology was used to monitor the internal failure process of the specimen in real time and analyze the failure process of the rock,the parameters of acoustic emission,and other mechanical characteristics.The research results show that the failure characteristics of layered composite rocks are not just the simple compound of failure characteristics of single rock,but the coupling failure characteristics under load effect.High-strength hard rock can constrain the lateral deformation of low-strength weak rock,while low-strength weak rock can promote the lateral deformation of high-strength hard rock.The research also shows the energy count of acoustic emission is closed related to the compaction,expansion,and penetration of internal cracks in composite rocks,which means the count can be used to evaluate the damage degree inside the rock.During the research,a damage evolution equation based on the accumulated energy is used,through which we found the fitted data is in good agreement with the experimental data.This means the acoustic emission energy count can be used to reflect the damage evolution law of the layered composite rock,making it as a reference for the damage research of layered composite rocks.

关 键 词：层状复合岩石 相似理论 单轴试验 声发射 损伤模型 

分 类 号：TU452[建筑科学—岩土工程]