| 马锋凯.底板导水裂隙带中含承压水裂隙的力学特性[J].地质与勘探,2017,53(5):1010-1016 |
| 底板导水裂隙带中含承压水裂隙的力学特性 |
| Mechanical properties of cracks containing confined water in the seam floor |
| 投稿时间：2017-01-05 修订日期：2017-06-20 |
| DOI： |
| 中文关键词: 煤层开采 底板突水 导水裂隙带 裂隙发育 |
| 英文关键词: coal mining, floor water inrush, cracks having confined water, crack growth |
| 基金项目:国家自然科学基金资助项目（41672219）资助 |
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| 中文摘要: |
| 华北煤田煤系地层的底部为含水丰富的奥陶系灰岩，该层灰岩与地表水系和煤系地层含水层存在着密切的水力联系。许多大型突水是采掘空间与含水层之间形成突水通道引起的。因此，分析开采工过程中底板岩体中含承压水裂隙的断裂力学特性具有重要意义。本文采用作者提出的数值方法分析了含高压水裂隙在开采过程中的断裂力学特性。假设裂隙面上作用着均匀水压力，考虑地应力的影响，采用断裂力学的叠加原理，分析了采煤工作面推进过程中含承压水裂隙的断裂力学特性，讨论了开采过程中底板承压水导升。结果表明：在工作面推进过程中，位于底板岩层且与含承压水岩层连通的裂隙，会在承压水水压力和扰动应力的共同作用下，产生破坏，导水裂隙带的高度会增加；这就增加了底板突水的危险性。 |
| 英文摘要: |
| The seam floor of coal fields in North China is Ordovician limestone containing abundant water, which has close hydraulic links with surface water and other aquifers. Many large water inrushes occur because of water inrush paths forming between mining space and aquifers. Therefore, it is of important significance to analyze the mechanical properties of cracks containing confined water in rock bodies of the seam floor. This work analyzed such properties of cracks using the proposed numerical method. It is assumed that the cracks are subjected to uniform pressure and the influence of in-situ stresses disturbed by mining activities is considered. Based on the superposition principle and fracture criteria, the mechanical properties of the cracks having confined water in coal mining were analyzed. The upward development of the zone containing confined water during mining was discussed in details. Results indicate that under the joint action of confined water and coal mining, the cracks directly above an aquifer may grow, the height of the confined water within the aquifer increases and the mining activity may induce water inrushes. |
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