The Characteristic of Micro-Fracture Evolution and Gas Permeability Effect in the Different Bedding Structure of Coal
The Characteristic of Micro-Fracture Evolution and Gas Permeability Effect in the Different Bedding Structure of Coal
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不同层理结构煤微裂缝演化特征及透气性效应
DOI：
10.1166/jnn.2017.14464
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发表时间：
2017-09-01
影响因子：
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通讯作者：
Yu, Minggao
中科院分区：
文献类型：
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作者：
Pan, Rongkun;Chen, Lei;Yu, Minggao
煤矿开采释放应力后，会产生许多新的裂隙。对不同层理结构的煤样进行了模拟分析。结果表明，气体渗透率的变化与裂缝演化过程一致，卸荷点处的初始应力和初始损伤对气体渗透率的变化有影响。当应力卸荷至1MPa时，渗透率的增加和渗透率的损失两种演化特征明显不同。顺层煤层开采过程中产生的大量新裂隙主要是由于增加了煤层的渗透性。
Many new fractures will produce when the stress is released by coal mining. In this research, different bedding structure coal samples were analyzed by simulations. The results show that the change of gas permeability is consistent with the fracture evolution, and the initial stress and initial damage on unloading point have influence on changing permeability. When the stress unloading to 1 MPa, there are two distinctively different kinds of evolution characteristics, which are the increase of permeability and loss of permeability respectively. A large number of new fractures are mainly contributed to increase the permeability in bedding coal seam when mining.