煤矿井下小断层的应力场分布数值模拟研究
摘要
从理论和数值模拟两方面分析了煤矿井下断层的力学特征,给出构造应力场的微观解释,并根据断层形成的力学模型描述了主应力轴与剪断面的相互关系。在理论分析的基础上运用数值模拟软件FLAC3D分别建立不同角度的断层,并对断层面附近应力场进行了模拟,得到断层端部应力集中程度、断层中部应力、原岩应力、断层倾角等因素的相互关系。对理论分析和模拟结果进行了对比,并根据煤与瓦斯突出综合假说,结合贵州某矿实例分析了断层附近突出高发的原因和应对策略。
In this paper,theoretical and numerical simulation analysis was carried out on the mechanical characteristics of faults in coal mines,the microscopic explanation of the tectonic stress field was given,and the interrelation between the principal stress axis and the shearing plane was described according to mechanical model of faults.On the basis of theoretical analysis,the faults at different angles were established by using the numerical simulation software FLAC 3D,the stress field near the fault plane was simulated,and finally,the relation among the end stress of fault,the middle stress of fault,the stress of the original rock,the dip angle of fault and so on.The theoretical analysis was contrasted with the simulated results,and analysis on the cause of outburst occurrence near the fault was made according to the comprehensive hypothesis of coal and gas outburst and the outburst examples in a certain mine in Guizhou Province.
In this paper,theoretical and numerical simulation analysis was carried out on the mechanical characteristics of faults in coal mines,the microscopic explanation of the tectonic stress field was given,and the interrelation between the principal stress axis and the shearing plane was described according to mechanical model of faults.On the basis of theoretical analysis,the faults at different angles were established by using the numerical simulation software FLAC 3D,the stress field near the fault plane was simulated,and finally,the relation among the end stress of fault,the middle stress of fault,the stress of the original rock,the dip angle of fault and so on.The theoretical analysis was contrasted with the simulated results,and analysis on the cause of outburst occurrence near the fault was made according to the comprehensive hypothesis of coal and gas outburst and the outburst examples in a certain mine in Guizhou Province.
引文
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[10]孙礼健,朱元清,杨光亮,等.断层端部及附近地应力场的数值模拟[J].大地测量与地球动力学,2009,29(2):1-3.
[2]张延新,蔡美峰,王克忠.平顶山一矿地应力分布特征研究[J].岩石力学与工程学报,2004(23):4033-4037.
[3]贾小亮.基于FLAC3D的断层数值模拟及应用[D].焦作:河南理工大学,2010(6):20-23.
[4]孟召平,彭苏萍,黎洪.正断层附近煤的物理力学性质变化及其对矿压分布的影响[J].煤炭学报,2001(12):2-3.
[5]崔洪庆,姚念岗.不渗透断层与瓦斯灾害防治[J].煤炭学报,2010,35(9):1-3.
[6]南存全,冯夏庭.凹形圆弧断裂构造的简化力学模型及其解析分析[J].岩石力学与工程学报,2004(23):3984-3989.
[7]王胜本,张晓.煤矿井下地质构造与地应力的关系[J].煤炭学报,2008,33(7):1-2.
[8]贾晓亮,崔洪庆,张子敏.断层端部地应力影响因素数值分析[J].煤田地质与勘探,2010,38(4):2-3.
[9]张胜利.构造应力场模拟—有限元理论、方法和研究进展[J].西北地震学报,2010,32(4):1-3.
[10]孙礼健,朱元清,杨光亮,等.断层端部及附近地应力场的数值模拟[J].大地测量与地球动力学,2009,29(2):1-3.
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