不同法向应力和剪切速率下煤平直节理剪切特性研究  

Study on shear characteristics of straight joints of coal under different normal stress and shear rate conditions

作　　者：孙月明 王一达 吴凡 方堃 田昊晨 陶康 SUN Yueming;WANG Yida;WU Fan;FANG Kun;TIAN Haochen;TAO Kang(Liyang Coal Industry Company,Jinneng Holdings Luyang Company,Jinzhong 032700,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]晋能控股潞阳公司李阳煤业公司,山西晋中032700 [2]中国矿业大学(北京)应急管理与安全工程学院,北京100083

出　　处：《煤矿安全》2024年第7期169-178,共10页Safety in Coal Mines

摘　　要：煤体剪切力学参数是分析煤体变形及稳定性的重要参数。为研究不同法向应力和剪切速率下煤平直节理剪切特性,开展剪切数值模拟与实验室试验,研究法向应力、剪切速率对煤平直节理剪切特性的影响规律。结果表明:节理剪切强度随剪切速率增加而减小,随着法向应力增加而增加,且法向应力越高,节理剪切强度受到剪切速率的影响越大;剪切刚度与法向应力呈正相关关系,与剪切速率呈负相关关系,当剪切速率达到一定值之后对剪切刚度的影响不明显;剪切速率增加使模拟节理更容易发生剪切滑移,易引发煤岩动力灾害,这一现象在高法向应力更为严重。The shear mechanical parameters of coal are important parameters for analyzing the deformation and stability of coal.In order to study the shear characteristics of straight joints of coal under different normal stress and shear rate conditions,the shear numerical simulation and laboratory test were carried out to study the influence of normal stress and shear rate on the shear characteristics of straight joints of coal.The results show that the shear strength of joints decreases with the increase of shear rate,and increases with the increase of normal stress.The higher the normal stress,the greater the influence of shear rate on the shear strength of joints.Shear stiffness is positively correlated with normal stress and negatively correlated with shear rate.When the shear rate reaches a certain value,the influence of shear stiffness is not obvious.The increase of shear rate makes the simulated joints more prone to shear slip,which is easy to cause coal and rock dynamic disasters.This phenomenon is more serious in high normal stress.

关 键 词：煤岩动力灾害 法向应力 剪切速率 煤平直节理 剪切强度 剪切刚度 

分 类 号：TD313[矿业工程—矿井建设]