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Tunnelling outburst potential affected by mechanical properties of coal seam

机译：受煤层力学特性影响的隧道掘进潜力

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Coal and gas outburst is greatly affected by the stress distribution in front of the heading face when tunnelling in high gassy coal seam. In this paper, the FLAC3Dsoftware and Mohr-Coulomb failure criterion are used to study the stress differences in front of the heading face. A total of 31 homogeneous models are built to study the stress differences affected by the coal seam mechanical properties. And another 8 kinds of heterogeneous models are built to study the stress differences affected by the abruptly changes of coal seam mechanical properties.When tunnelling in homogeneous coal seam, the large elastic modulus of coal seam will increase the stress peak value in front of the heading face, but do not change the stress peak position. The small internal friction angle will push the stress peak far away from the heading face. Therefore, the range of stress-relief zone in front of the heading face could significantly increase. The small cohesion of the coal seam will also push the stress peak far away from the heading face, but will result in an increase in the stress peak value. The Poisson ratio and tensile strength of the coal seam have little influence on the value and position of stress peak. As the elastic modulus decreases, cohesion and internal friction angle can greatly increase the displacement of the coal in front of the heading face. Taking into account both the mechanical properties of coal seam and the corresponding stress peaks, gas outburst is not easy to occur in the homogeneous coal seam.When tunnelling in heterogeneous coal seam, the abrupt change of coal seam elastic modulus greatly affects the stress concentration peak. If the cohesion of the coal seams also changes greatly with the elastic modulus, the stress peak will be enhanced. The abrupt change of coal seam cohesion and Poisson ratio have a slight influence on the stress concentration, while the abrupt change of internal friction angle of coal seam have little effect on the stress concentration. An outburst accident is most likely triggered when the cohesion and elastic modulus of the coal seams change greatly at the same time.Outcomes of this study is very beneficial for the prediction and prevention of coal and gas outburst. Meanwhile, this study provides a reference for the setting of mechanical properties of the coal seam and rock layers in the numerical simulation of mining.
机译：在高瓦斯煤层中掘进时，掘进工作面前部的应力分布会极大地影响煤与瓦斯的突出。本文采用FLAC3D软件和Mohr-Coulomb破坏准则研究了掘进工作面前部的应力差异。总共建立了31个均质模型来研究受煤层力学性能影响的应力差。建立了另外8种非均质模型，研究了煤层力学性质的突然变化对应力的影响。当在均质煤层中掘进时，较大的煤层弹性模量会增加掘进前的应力峰值面对，但不要更改应力峰值位置。小的内部摩擦角将使应力峰值远离航向面。因此，掘进面前方应力释放区的范围可能会大大增加。煤层的小内聚力也会使应力峰值远离掘进工作面，但会导致应力峰值增加。煤层的泊松比和抗拉强度对应力峰值的值和位置影响很小。随着弹性模量的降低，内聚力和内摩擦角会大大增加煤在掘进面前方的位移。考虑到煤层的力学性质和相应的应力峰值，均质煤层不易发生瓦斯突出，在异质煤层中掘进时，煤层弹性模量的突变会极大地影响应力集中峰。如果煤层的内聚力也随弹性模量而发生很大变化，则应力峰值将增强。煤层内聚力和泊松比的突变对应力集中影响不大，而煤层内摩擦角的突变对应力集中影响不大。当煤层的内聚力和弹性模量同时发生较大变化时，极有可能引发突出事故。本研究的结果对于预测和预防煤与瓦斯突出非常有利。同时，该研究为煤层和岩石层力学性能的数值模拟提供参考。

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