采矿与安全工程学报 ›› 2013, Vol. 30 ›› Issue (1): 38-44.

• 论文 • 上一篇    下一篇

含断层煤层底板损伤破坏演化数值模拟及微震监测研究

  

  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,江苏  徐州  221008
  • 收稿日期:2012-03-22 出版日期:2013-01-15 发布日期:2013-01-17
  • 作者简介:陆银龙(1985-),男,江苏省盐城市人,博士,从事岩石力学与采矿工程等方面的研究。 E-mail:yinlong_lu@163.com Tel:15262026776
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2010CB226805);
    国家自然科学基金项目(51274191)

Modeling and microseismic monitoring of damage and failure evolution of faulty coal seam floor

  • Received:2012-03-22 Online:2013-01-15 Published:2013-01-17

摘要: 基于弹性损伤力学理论,建立了考虑不同围压下岩石残余强度的分段线性弹性损伤本构模型,利用岩石常规三轴压缩实验和劈裂实验确定了损伤模型的基本参数。以某矿井工程地质条件为背景,采用MATLAB软件编程将损伤本构模型嵌入到COMSOL软件中,对工作面推进过程中含断层煤层底板的损伤破坏演化规律进行了数值模拟研究。结果表明,当工作面回采至断层区域附近时,断层带活化区将与开采造成的底板破坏区相连接,显著地增大了底板的破坏深度,削弱了隔水层的隔水性能,增加了底板突水的可能性。采用高精度微地震监测仪对煤层底板破坏范围进行了现场动态监测,监测结果与数值模拟结果基本吻合。

关键词: 断层活化, 损伤演化, 微震监测, 突水

Abstract: Based on the elastic damage mechanics theory, a piecewise linear and elastic damage constitutive model incorporating the residual strengths under different confining pressures was constructed, and the model parameters were determined by general triaxial compression and split tension tests. In addition, taking the geology conditions in one mine as engineering background, the damage and failure evolution characteristics of faulty coal seam floor during the mining process were simulated, after the established damage model programmed by MATLAB being embedded into COMSOL. The results show that when the working face moves to the top zones of fault, the active zones of fault will connect with the failure zones in floor induced by mining, which dramatically increases the failure depth of floor, reduces the water isolating properties of the aquifuge, and increases water-inrush possibility. Finally, the high-precision microseismic monitoring technique was employed to monitor the dynamic failure characteristics of the coal seam floor, and the monitoring results are basically in agreement with the numerical results.

Key words: fault activation, damage evolution, micro seismic monitoring, water-inrush

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