煤矿隐伏断层突水的断裂力学模型及力学判据  

Fracture mechanical model and criteria of insidious fault water inrush in coal mines

作　　者：陈忠辉[1] 胡正平[1] 李辉[1] 陈庆丰[1] 

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,北京100083

出　　处：《中国矿业大学学报》2011年第5期673-677,共5页Journal of China University of Mining & Technology

基　　金：国家重点基础研发展究计划(973)项目(2007CB209402);国家自然科学基金重点项目(50834005);国家"十一五"科技支撑项目(2009BAK54B03)

摘　　要：针对导水断层和底板塑性滑移场的空间关系,把导水断层和底板塑性滑移场的最短距离视为断层突水的关键路径,建立了底板隐伏断层突水的简化断裂力学模型.利用断裂力学理论分析了含斜裂缝有限板裂缝尖端的应力强度因子计算公式,推导了导水断层发生劈裂破坏的临界水压力以及影响因素.结果表明:发生断层突水的临界水压力随着断层长度增加而减小、随着断层到底板距离的增加而减小、随着水平压力增大而增大的趋势.根据压剪裂缝扩展时翼型分支裂纹扩展理论,获得底板隐伏断层突水的必要条件是承压水达到临界水压力,充分条件为断层到煤层底板的最短距离达到一个的临界值以及相应的理论公式.The shortest distance between a permeable fault and the mine floor is considered the main path for water inrush.A simplified fracture model of water inrush through a fault in the floor was developed based on the spatial relationship between the permeable fault and the plastic region of the floor.Fracture mechanics was used to analyze the stress intensity factor on a finite plate having an oblique crack.This allowed the critical water pressure for hydraulic splitting to be obtained.The results show that the critical water pressure decreases as the length of the fault increases.An increase in the distance between the fault and floor,and a decrease in horizontal pressure,also will cause a decrease in critical water pressure.Crack propagation theory in a state of compressive shear requires that water inrush through an insidious fault be preceded by the water pressure reaching a critical value.It is sufficient that the distance between fault and floor reach a critical value.A theoretical formula expressing these relationships is presented.

关 键 词：断层突水 地质力学模型 劈裂分析 应力强度因子 

分 类 号：TD745[矿业工程—矿井通风与安全]