微裂隙对深部高应力围岩劈裂破坏演化规律的影响分析  

Influence of micro-fissure on Splitting Failure Evolvement of Deep Surrounding Rock with High Stress

作　　者：聂韬译[1,2] 浦海[1,2] 刘桂宏[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《煤矿开采》2015年第2期4-7,101,共5页Coal Mining Technology

基　　金：国家优秀青年科学基金(51322401);国家重点基础研究发展计划(973)项目(2013CB227900);国家自然科学基金委员会与神华集团有限责任公司联合资助项目(U1261201);中国矿业大学中央高校基本科研业务费专项资金(2014YC09)

摘　　要：引入表征体积单元,采用考虑闭合效应下基于曲线扩展路径的劈裂演化等效连续体模型,利用FISH语言,内嵌入FLAC软件中,使方法程序化,分析微裂隙对深部高应力围岩劈裂破坏演化规律的影响。结果表明:裂隙越长,围岩劈裂破坏深度、面积越大;随着倾角的增长,劈裂破坏深度、面积先增大后减小并最终趋向于0,45°时达到最大值,倾角接近90°时,微裂隙形成自锁,劈裂破坏显著抑制;随着摩擦系数的增大,劈裂破坏深度、面积逐渐减小并最终趋向于0。By importing representation element volume, equivalent continuum model of splitting evolvement with closure effect based on curve expanding path was applied to analyzing influence of micro fissure on splitting failure evolvement of deep surrounding rock with high stress with FLAC software. Results showed that the longer the fissure was, the larger the depth and area of splitting failure was. With inclined angle increasing, splitting failure depth and area firstly increased, then reduced and finally tended to 0. When in- clined angle was 45, splitting failure depth and area reached the maximum. When it was near 90, micro fissure development was re- stricted. With frictional coefficient increasing, splitting failure depth and are gradually reduced and finally tended to 0.

关 键 词：微裂隙 深部 高应力围岩 劈裂破坏 数值模拟 

分 类 号：TD313[矿业工程—矿井建设]