循环载荷下煤-岩结构体能量耗散与损伤特征研究  

Study on Energy Dissipation and Damage Characteristics of Coal-rock Structural Body under Cyclic Loading

作　　者：李谭 张尚波 陈光波 秦忠诚[2] 李青海[2] LI Tan;ZHANG Shangbo;CHEN Guangbo;QIN Zhongcheng;LI Qinghai(College of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010 [2]山东科技大学能源与矿业学院,山东青岛266590

出　　处：《太原理工大学学报》2022年第4期649-659,共11页Journal of Taiyuan University of Technology

基　　金：内蒙古自然科学基金资助项目(2021LHMS05015)。

摘　　要：为了研究不同煤-岩高度比的煤-岩结构体在循环载荷作用下的能量演化与损伤变形特征,进行了单轴循环加载试验,引入耗能比,探讨循环加/卸载过程中能量耗散特征;并通过耗散能量法和声发射法对煤-岩结构体的损伤变量进行比较分析,基于两种损伤变量计算方法的特点,提出了联合损伤变量计算法,进而探讨结构体损伤变量演化特征。试验结果表明:随着应变的增加,耗能比呈现出先降低再升高的变化趋势,且同一应变水平下,煤-岩高度比越大,耗能比越大。煤-岩结构体产生相同耗能比时,煤-岩高度比越小的结构体产生的应变也越小。通过联合计算法得到的损伤变量演化规律与结构体的实际劣化过程吻合程度较高,能有效反应结构体在载荷作用下裂隙的发育、扩展情况。In order to study the energy evolution and damage deformation characteristics of coal-rock structureal body,the energy dissipation ratio was introduced,and the uniaxial cyclic loading tests of coal-rock structureal body with different coal-rock height ratio were carried out to explore the energy dissipation characteristics during cyclic loading.The damage variables calculated by dissipative energy method and acoustic emission method were compared and analyzed,a joint calculation method of the damage variables was proposed,and then the damage and deformation evolution characteristics of the structureal body were discussed.The test results show that with the increase of strain,the energy dissipation ratio decreases and then increases.At the same strain level,the greater the coal-rock height ratio,the greater the energy dissipation ratio.When the coal-rock structureal body produces the same energy dissipation ratio,the greater the coalrock height ratio,the greater the strain of the structureal body.The damage variable evolution law obtained by the joint calculation method is highly consistent with the actual deterioration process of the structureal body,and can more effectively reflect the development and propagation of cracks and fissures under load.

关 键 词：循环载荷 煤-岩结构体 能量耗散 损伤特征 声发射 

分 类 号：TD324[矿业工程—矿井建设]