深部矿井频繁微扰动下煤巷损伤累积演化规律  

Evolution of accumulated damage in deep coal roadway with repeated dynamic disturbance

作　　者：魏明尧[1] 刘春[1] 刘应科[2] 满忠毅 王强 牛宏伟 WEI Mingyao;LIU Chun;LIU Yingke;MAN Zhongyi;WANG Qiang;NIU Hongwei(National and Local Joint Engineering Laboratory of Internet Application Technology on Mine,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Key Laboratory of Fire Safety in Urban Underground Space,China University of Mining and Technology,Xuzhou 221116,China;Lu'an Chemical Group Co.Ltd,Changzhi 046200,China)

机构地区：[1]中国矿业大学矿山互联网应用技术国家地方联合工程实验室,江苏徐州221116 [2]中国矿业大学江苏省城市地下空间火灾防护高校重点实验室,江苏徐州221116 [3]潞安化工集团有限公司,山西长治046200

出　　处：《中南大学学报（自然科学版）》2021年第8期2689-2701,共13页Journal of Central South University:Science and Technology

基　　金：中国博士后科学基金资助项目(2019M661997);国家自然科学基金资助项目(52074283,51774277)~~。

摘　　要：建立煤体损伤增量本构模型和黏聚力软化模型,并采用Mohr-Coulomb破坏准则进行塑性变形修正,全面表征煤体的累积损伤破坏力学特征。采用C++语言编写FLAC3D软件的自定义本构模型动态链接库文件,通过循环快速加卸载实验对比验证新模型的准确性。模拟频繁扰动作用后巷道围岩的变形和破坏过程,并分析扰动次数和埋深因素对围岩破坏特征的影响规律,讨论频繁扰动造成的围岩冲击破坏孕育机理。研究结果表明:在地应力和频繁扰动应力共同作用下,造成巷道左帮破坏严重,围岩内部产生大量损伤区并形成多条连通的损伤带;随着扰动次数的增加,左侧围岩损伤程度和损伤范围增加,当扰动次数超过临界点时,围岩损伤程度大幅增加,易引起围岩区域性的严重破坏;煤层埋深越大,原岩应力越高,对外界扰动越敏感,在扰动应力叠加作用下围岩损伤破坏带延伸至深部,且损伤带贯通区域增大,更易形成围岩的整体失稳破坏。The constitutive model for damage and cohesive force softening model were built. Mohr-Coulomb model was adopted for plastic deformation correction. The repeated disturbance-induced deformation of coal was well characterized. A new dynamic link library was implemented as a file in C++ language that can be loaded in the simulation software FLAC3D. The process of impact failure and deformation of roadway after repeated disturbance were simulated, and the effect of number of disturbance and depth of roadway were analyzed. The results indicate that a serious damage occurs in the left wall under the combined influence of geo-stress and with dynamic disturbance. Numerous fractures generate that composes some connective fractures called zonal disintegration, especially in left wall. The more frequent disturbance occurs, the more damage degree and damage zone are induced. The damage is even more severe if the number of disturbance excess critical value that will causes large-scale of coal damage. The larger depth of roadway is more sensitive to external disturbance with a serious damage and penetrative crack zone.

关 键 词：动力扰动 围岩损伤 数值模拟 动力灾害 

分 类 号：TD324[矿业工程—矿井建设]