摘要
针对卧龙湖煤矿由于地面瓦斯抽放孔套管错断导致8101工作面顶板异常出水的问题,采用数值模拟方法对突水机理进行探究。通过数值模拟,分析研究了随着工作面推进,顶板瓦斯抽放孔围岩的应力、位移变化情况。分析结果表明：随着工作面不断推进,当通过瓦斯孔10 m后,顶板应力出现3个应力大幅度降低点,位移同步大幅度增加,离层发育;继续推进,通过瓦斯孔20~30 m时,应力继续大幅度降低,基本达到最大降幅,位移同步增加,之后随着煤层推进应力、位移变化幅度微小,与现场顶板异常出水现象较好对应。说明由于离层导致瓦斯孔套管错断,顶板砂岩裂隙水从错断的套管中汇入工作面。
In view of the abnormal roof water inrush of 8101 working face of Wolonghu Coal Mine caused by casing broken, numerical simulation method was used to analyze the mechanism of water inrush. By numerical simulation, the changes of stress and displacement of the surrounding rock of gas drainage hole was analyzed with the working face advancing. The results show that the roof stress ap- peared three stress reduced substantially points and the displacement increased synchronously and separation developed when the work- ing face passed the gas drainage hole 10 m ; when the working face passed the gas drainage hole 20 to 30 m, the stress achieved the largest decline and the displacement increased substantially then the stress and displacement changed a small margin. It＇s a good corresponding with the roof abnormal water inrushing phenomenon. The results show that sandstone fracture water flows to the working face from the broken casing because of the casing broken.
出处
《煤矿安全》
CAS
北大核心
2014年第6期5-7,11,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(41272278)
高等学校博士学科点专项科研基金资助项目(20123415110002)
关键词
瓦斯抽放孔
煤层开采
离层带
裂隙水
数值模拟
矿井突水
gas drainage hole
coal seam mining
bed - separation zone
fracture water
numerical simulation
water inrush
