岩体循环加卸载力学特性对完整底板导水通道演化影响研究  

Study on the influence of mechanical properties of rock mass cyclic loading and unloading on the evolution of the intact floor

作　　者：李浩[1] 白海波[1] 武建军 赵慧明[3] 孟庆彬[1] 马凯[1] 黄卫星[1] 郑磊[1] LI Hao;BAI Haibo;WU Jianjun;ZHAO Huiming;MENG Qingbin;MA Kai;HUANG Weixing;ZHENG Lei(State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;Shanxi China Coal Huajin Energy Limited Liability Company, Hejin, Shanxi 043300, China;College of Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China)

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]山西中煤华晋能源有限责任公司,山西河津043300 [3]中国矿业大学理学院,江苏徐州221116

出　　处：《岩石力学与工程学报》2018年第A01期3470-3480,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：江苏省普通高校研究生科研创新计划项目(KYLX16_0537)~~

摘　　要：防控底板突水危害的重点在于研究完整底板由隔水层到导水通道的演化过程。根据采矿过程中底板岩体在压–拉–压荷载下弹性刚度变化特点,以弹性模量作为损伤变量,采用双标量型D-P弹塑性损伤本构模型,由成庄矿工程地质条件为背景建立有限元模型,分析工作面推进过程中底板导水通道演化规律。得到主要结论如下:(1)采动底板中同时存在压、拉损伤破裂带,压缩、拉伸损伤分别超前、滞后煤壁产生,二者相互连通,形成斜穿工作面煤壁平面的导水通道。(2)底板破坏深度随顶板悬露面积增大而增加,并导致上一计算步煤壁处底板破裂深度二次加深。工作面煤壁位置处底板压缩损伤深度的增长速率在充填体影响下迅速减小(顶板初次垮落),并最终达到稳定(顶板周期垮落)。(3)充填体的弹性模量过低会导致破坏深度持续快速增加。在充填体作用下,底板岩体中张拉裂隙闭合,弹性刚度有所恢复,同时岩体渗透性降低。由注水试验所得监测结果与数值模拟成果基本吻合。The focus of prevention and control of water inrush from floor is to study the evolution of the intact floor from aquifuge to water-conducting. According to the elastic stiffness variation characteristics of floor rock mass in mining process,which beard loading of compression-tension-compression,using double scalar D-P elastoplastic damage constitutive model,finite element model was built based on the engineering geological conditions of Chengzhuang mine,the evolution law of water-conducting was analyzed in working face advancing process. The main conclusions are as follows：（1） Compression and tensile damage zones exist in mining floor. Compressive and tensile damage zones lead and lag coal wall respectively,both of them are connected,forming a water-conducting,which is inclined to pass through the plane of the coal wall.（2） Floor damage depth increases with the increase of the roof hanging area,and leads to the fracture depth increases again in last calculation step. Under the influence of filling body,the growth rate of the floor compression damage depth at the position of the coal wall is rapidly decreasing（the first roof caving）,and finally reaching stability（the periodic caving）.（3） Floor failure depth will rapid increase if elastic modulus of filling body is too low. Under the action of the filling body,the tension crack closure and the elastic stiffness of floor rock mass are restored,permeability of rock mass is decreased at the same time. The monitoring results obtained from the water injection experiment are in agreement with the numerical simulation results.

关 键 词：岩石力学 循环加卸载 弹塑性损伤本构模型 导水通道 滞后煤壁 注水试验 

分 类 号：TU45[建筑科学—岩土工程]