掘进工作面前方地应力与孔隙压力分布的数值模拟研究  

Numerical Simulation Research on the Distribution of Ground Stress and Pore Pressure in Front of Heading Faces

作　　者：王刚[1] 程卫民[1] 王宏伟[2] 张孝强[1] 

机构地区：[1]山东科技大学资源与环境工程学院,山东青岛266590 [2]中国矿业大学力学与建筑工程学院,北京100083

出　　处：《山东科技大学学报（自然科学版）》2012年第5期9-14,92,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东省科技发展计划项目(2010GSF10808)

摘　　要：基于库仑准则和煤体瓦斯吸附和解吸规律,以掘进头前方40m的煤层为研究对象,分别建立了煤体中瓦斯解吸/吸附与流动的数学模型和掘进头前方煤体变形破坏的数学模型,并采用数值模拟的方法,模拟了分步开挖过程中煤壁前方的瓦斯压力和顶板压力的变化。结果表明,掘进工作面开挖后,掘进工作面周围的瓦斯压力分布呈子弹头形状向前移动,掘进巷道周围煤体瓦斯压力随煤壁暴露时间的延长而降低。掘进工作面煤壁前方的矿压分布规律为:卸压区宽度约为3m;3～5m为塑性区(应力集中区部分);5～20m为弹性区(应力集中区部分);20m以后为原始应力区。瓦斯的影响范围约20m;每掘进一步,煤壁前方的矿山压力和瓦斯压力的变化趋势基本相同。Based on the Coulomb criterion and the laws of coal gas adsorption/desorption and taking the coal seam at 40 m away in front of heading face as research object,the mathematical models about the gas adsorption/desorption and flowing,and the deformation and failure of the coal body in front of the coalface are established respectively.The numerical simulation method is adopted to simulate the changes of gas and roof pressure in front of the coal wall during excavation step by step.Results showed that after the excavation,the gas pressure distribution around hea-ding face moved forward by the shape of the bullet,coal gas pressure around the roadway decreased with exposure time of coal wall;the law of pressure distribution in front of heading face are：the width of pressure relief zone was about 3 m;the plastic zone（the part of stress concentration area） about 3-5 m;the elastic region（the part of stress concentration area） about 5-20 m;the original stress areas about 20 m further;the range influenced by gas is about 20 m;the change trend of rock and gas pressures was basically the same in front of coal wall in each heading cycle.

关 键 词：掘进工作面 动态 地应力 瓦斯压力 数值模拟 

分 类 号：TD713[矿业工程—矿井通风与安全]