基于正交试验的软弱煤层巷道变形影响因素研究
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摘要
为探究巷道埋深、侧压系数、巷道断面高宽比对软弱煤层巷道变形影响的显著性大小,设计正交试验,通过对FLAC3D数值模拟结果计算分析得到结论:(1)埋深对巷帮移近量和顶板下沉量起主要影响作用,侧压系数次之,巷道高宽比影响作用相对较小;(2)随埋深增加,软弱煤层巷道变形量增加趋势最为陡峭,侧压系数与巷道高宽比影响趋势相对平缓,巷道变形量随侧压系数增加而增加,随巷道高宽比增加而降低。
In order to explore the significance of the influence of tunnel depth, lateral pressure coefficient and aspect ratio of tunnel section on the deformation of soft coal seam roadway, designs orthogonal test and obtains the conclusions by calculating the numerical simulation results of FLAC3 D:(1)the buried depth plays an important role in the near-displacement and roof subsidence of the roadway, and the side-pressure coefficient is the second, and the ratio of roadway height to width is relatively small;(2)with the increase of buried depth, the deformation of soft coal seam is the most steep, the influence trend of lateral pressure coefficient and roadway height-width ratio is relatively smooth, the deformation of roadway increases with the increase of lateral pressure coefficient, and decreases with the increase of the ratio of the roadway′s height to width.
In order to explore the significance of the influence of tunnel depth, lateral pressure coefficient and aspect ratio of tunnel section on the deformation of soft coal seam roadway, designs orthogonal test and obtains the conclusions by calculating the numerical simulation results of FLAC3 D:(1)the buried depth plays an important role in the near-displacement and roof subsidence of the roadway, and the side-pressure coefficient is the second, and the ratio of roadway height to width is relatively small;(2)with the increase of buried depth, the deformation of soft coal seam is the most steep, the influence trend of lateral pressure coefficient and roadway height-width ratio is relatively smooth, the deformation of roadway increases with the increase of lateral pressure coefficient, and decreases with the increase of the ratio of the roadway′s height to width.
引文
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[2]余伟健,袁越,王卫军.困难条件下大变形巷道围岩变形机理与控制技术[J].煤炭科学技术,2015,43(1):15-20.
[3]王卫军,袁超,余伟健,等.深部高应力巷道围岩预留变形控制技术[J].煤炭学报,2016,41(9):2 156-2 164.
[4]杨玉亮.采动巷道支护参数优化设计研究[J].煤炭技术,2011,30(3):81-82.
[5]高富强,王兴库.岩体力学参数敏感性正交数值模拟试验[J].采矿与安全工程学报,2008,25(1):95-98.
[6]张恩强,吴蒸,高丁丁,等.采动影响下工作面巷道变形破坏机理研究[J].煤炭技术,2017,36(1):24-26.
[7]任露泉.试验优化设计与分析[M].北京:高等教育出版社,2003.
[8]曾正良.巷道变形破坏的因素及控制方法[J].煤炭技术,2008,27(4):141-143.