水岩耦合作用下面长效应对底板稳定性的影响研究
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摘要
煤层开采尺寸的增加会使采场围岩受采动影响范围增大,尤其是在煤层底板强含水层赋存条件下,研究面长效应对底板稳定性的影响意义重大。我国华北型矿区均受石炭二叠纪煤系底部的太灰、奥灰强含水层影响,底板突水的危险性与采动充分程度密切相关。此次通过水岩耦合数值仿真模拟,分析不同面长条件下底板隔水层矿压显现特征,运用fish程序将进入塑性破坏状态岩石调整为应变软化模型,研究受面长效应的影响时,底板隔水层的破坏程度、破坏区形态。研究结果可为承压水上安全开采预防措施的采取提供参考。
The increase of the size of coal seam mining will increase the influence range of mining surrounding rock in mining, especially under the condition of strong aquifer in coal floor, the influence of surface length effect on the stability of floor is of great significance. The North China-type mining areas are affected by the high ash and austral ash aquifers at the bottom of the Carboniferous Permian coal system. The risk of water inrush from the floor is closely related to the sufficient degree of mining. Through the numerical simulation of water-rock coupling, the characteristics of rock pressure in the aquifer under different surface length conditions were analyzed. The fish program was used to adjust the rock into the strain-softening model to study the influence of the surface length effect. The degree of damage of the aquifuge and the shape of the damaged zone were studied. The research results provided reference for the prevention measures for safe mining of pressurized water.
The increase of the size of coal seam mining will increase the influence range of mining surrounding rock in mining, especially under the condition of strong aquifer in coal floor, the influence of surface length effect on the stability of floor is of great significance. The North China-type mining areas are affected by the high ash and austral ash aquifers at the bottom of the Carboniferous Permian coal system. The risk of water inrush from the floor is closely related to the sufficient degree of mining. Through the numerical simulation of water-rock coupling, the characteristics of rock pressure in the aquifer under different surface length conditions were analyzed. The fish program was used to adjust the rock into the strain-softening model to study the influence of the surface length effect. The degree of damage of the aquifuge and the shape of the damaged zone were studied. The research results provided reference for the prevention measures for safe mining of pressurized water.
引文
[1]刘晓丽.水-岩耦合过程及其多尺度行为的理论与应用研究[D].北京:清华大学,2008.
[2]涂敏.潘谢矿区采动岩体裂隙发育高度的研究[J].煤炭学报,2004,29(6):641-645.
[3]刘德君.采空区的围岩应力分布及其与底板突水的关系[J].煤矿安全,1988(7):35-39.
[4]关英斌,李海梅,路军臣.显德汪煤矿9号煤层底板破坏规律的研究[J].煤炭学报,2003,28(2):121-125.
[5]施龙青,韩进.底板突水机制及预测预报[M].北京:中国矿业大学出版社,2004.
[6]虎维岳,尹尚先.采煤工作面底板突水灾害发生的采掘扰动力学机制[J].岩石力学与工程学报,2010,29(1):3 344-3 348.
[7]左宇军,李术才,秦泗凤,等.动力扰动诱发承压水底板关键层失稳的突变理论研究[J].岩土力学,2010,31(8):2 361-2 366.
[8]刘树才.煤矿底板突水机理及破坏裂隙带演化动态探测技术[D].徐州:中国矿业大学,2008.
[9]弓培林,胡耀青,赵阳升,等.带压开采底板变形破坏规律的三维相似模拟研究[J].岩石力学与工程学报,2005,24(23):4 396-4 402.
[2]涂敏.潘谢矿区采动岩体裂隙发育高度的研究[J].煤炭学报,2004,29(6):641-645.
[3]刘德君.采空区的围岩应力分布及其与底板突水的关系[J].煤矿安全,1988(7):35-39.
[4]关英斌,李海梅,路军臣.显德汪煤矿9号煤层底板破坏规律的研究[J].煤炭学报,2003,28(2):121-125.
[5]施龙青,韩进.底板突水机制及预测预报[M].北京:中国矿业大学出版社,2004.
[6]虎维岳,尹尚先.采煤工作面底板突水灾害发生的采掘扰动力学机制[J].岩石力学与工程学报,2010,29(1):3 344-3 348.
[7]左宇军,李术才,秦泗凤,等.动力扰动诱发承压水底板关键层失稳的突变理论研究[J].岩土力学,2010,31(8):2 361-2 366.
[8]刘树才.煤矿底板突水机理及破坏裂隙带演化动态探测技术[D].徐州:中国矿业大学,2008.
[9]弓培林,胡耀青,赵阳升,等.带压开采底板变形破坏规律的三维相似模拟研究[J].岩石力学与工程学报,2005,24(23):4 396-4 402.