范各庄矿F_0断层滞后突水数值模拟
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摘要
开滦矿业集团公司范各庄矿F0断层贯穿该矿整个井田,根据现场条件获取断层带原样物质,并进行断层物质原样和复制样的蠕变力学试验,得到断层物质不同条件下的实验室数据;运用FLAC3D数值计算软件,对范各庄矿F0断层对开采的影响进行流-固耦合模拟和渗流蠕变计算,得到不同时间段采矿活动对断层的影响数据。计算表明,底板岩层垂直位移量在断层附近最大,断层的存在使底板承受较大构造应力,并存在大范围的剪应力区,断层部位的应力集中是造成底板破坏、发生底板突水的关键。模拟结果较好地刻画出承压水对上覆岩层及断层带的影响、开采活动对底板岩层的影响、断层破碎带受开采影响的大小和范围以及承压水影响的时间效应,为矿井安全生产提供可靠的基础数据。
The fault F0 of the Fangezhuang coal mine,Kailuan coal group,runs through the whole mine field. Based on the experimental results of the creep for the faults,the data of the faults under different conditions obtained. The influence of mining activity on the faults at different periods is gained through the simulation of fluid-solid coupling and the calculation of seepage creep using numerical simulations software FLAC3D. The results indicate that vertical displacement of floor strata near the faults reaches maximum value. Large tectonic stress on the floor is caused by the faults,which leads to a wide range shear stress area at the same time. The stress concentration is the key factor of the breakage and water bursting of floor. The basic phenomena including the influence of confined water on the overlaying rock and faults,the influence of mining activity on the floor strata, the size and range of influence of the mining activity on the faults,and the time-effect of the influence on the confined water,are described by the simulation results very well,which provides reliable basic data for the safety of the coal production.
The fault F0 of the Fangezhuang coal mine,Kailuan coal group,runs through the whole mine field. Based on the experimental results of the creep for the faults,the data of the faults under different conditions obtained. The influence of mining activity on the faults at different periods is gained through the simulation of fluid-solid coupling and the calculation of seepage creep using numerical simulations software FLAC3D. The results indicate that vertical displacement of floor strata near the faults reaches maximum value. Large tectonic stress on the floor is caused by the faults,which leads to a wide range shear stress area at the same time. The stress concentration is the key factor of the breakage and water bursting of floor. The basic phenomena including the influence of confined water on the overlaying rock and faults,the influence of mining activity on the floor strata, the size and range of influence of the mining activity on the faults,and the time-effect of the influence on the confined water,are described by the simulation results very well,which provides reliable basic data for the safety of the coal production.
引文
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[11]Itasca Cansitlting Group,Inc..FLAC3D,user′s manual(version2.0)[R].USA:Itasca Consulting Group,Inc.,1997.
[2]倪宏革,罗国煜.煤矿水害的优势面机制研究[J].煤炭学报,2000,25(5):518–521.(NI Hongge,LUO Guoyu.Study on the mechanism of preferred plane of water hazard in coal mine[J].Journal of China Coal Society,2000,25(5):518–521.(in Chinese))
[3]王学滨,李毅.平面应变含缺陷岩样变形破坏全过程数值模拟[J].中国矿业大学学报,2005,34(2):198–203.(WANG Xuebin,LI Yi.Numerical simulation of complete failure process of rock with material imperfection in plane compression strain[J].Journal of China University of Mining and Technology,2005,34(2):198–203.(in Chinese))
[4]周瑞光.一项岩体地下硐室工程建设中的岩体力学特性研究[C]//岩体工程地质力学问题(九).北京:科学出版社,1990.(ZHOU Ruiguang.Study on characteristics of rock mechanics in the construction of underground cavern[C]//Problems on GeologicalMechanics of Rock Mass.Beijing:Science Press,1990.(in Chinese))
[5]周瑞光,成彬芳,高玉生,等.断层泥蠕变特性与含水量关系研究[J].工程地质学报,1998,6(3):217–222.(ZHOU Ruiguang,CHENG Binfang,GAO Yusheng,et al.Relationship between creep behavior of fault gouge and its water contents[J].Journal of Engineering Geology,1998,6(3):217–222.(in Chinese))
[6]周瑞光,成彬芳,叶贵均,等.断层破碎带突水的时效特性研究[J].工程地质学报,2000,8(4):411–415.(ZHOU Ruiguang,CHENG Binfang,YE Guijun,et al.Time effect of water inrush in fault rupture zone[J].Journal of Engineering Geology,2000,8(4):411–415.(in Chinese))
[7]童有德,叶贵钧.华北岩溶充水煤矿区底板滞后突水机制及其评价方法[C]//中国煤炭学会矿井地质专业委员会2001年学术年会论文集.北京:煤炭工业出版社,2001.(TONG Youde,YE Guijun.The mechanism and evaluation method of water inrush of floor logging in water-filled coal mine zone in northem China[C]//Proceedings of the Special Committee of Mine and Geology of China Coal Society.Beijing:Chinese Cool Industry Publishing House,2001.(in Chinese))
[8]陈平,张有天.裂隙岩体渗流与应力耦合分析[J].岩石力学与工程学报,1994,13(4):299–308.(CHEN Ping,ZHANG Youtian.Coupling analysis of seepage/stress for jointed rock[J].Chinese Journal of Rock Mechanics and Engineering,1994,13(4):299–308.(in Chinese))
[9]武强,刘金韬,董东林,等.煤层底板断裂突水时间弱化效应机制的仿真模拟研究[J].地质学报,2001,75(4):554–561.(WU Qiang,LIU Jintao,DONG Donglin,et al.Trial analyses and numerical simulation of water inrush time effect under coal bed[J].Acta Geological Sinica,2001,75(4):554–561.(in Chinese))
[10]刘伟韬.煤层底板断裂滞后突水机制及数值仿真研究[博士学位论文][D].北京:中国矿业大学,2005.(LIU Weitao.Study on mechanism of fracture lagging water inrush and numerical simulation in coal floor[Ph.D.Thesis][D].Beijing:China University of Mining and Technology,2005.(in Chinese))
[11]Itasca Cansitlting Group,Inc..FLAC3D,user′s manual(version2.0)[R].USA:Itasca Consulting Group,Inc.,1997.
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