矩形巷道无支护状态下巷道围岩变形数值模拟分析
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摘要
为确定亭东矿首采面的回采巷道的最佳支护方式和支护参数,首先采用数值模拟的方法对矩形巷道无支护条件下的塑性区分布和表面位移量进行模拟分析。通过对矩形巷道围岩应力和塑性区分布情况的分析,发现围岩破坏以顶板、底板、两帮表面中部最严重,并沿垂直于巷道表面的方向围岩深部扩展,且以两帮扩展范围最大,巷道顶板和底板破坏延伸距离相似,但顶板破坏范围大于底板,底角并未发生破坏。通过对巷道位移量的分析表明,矩形巷道两帮和顶板位移量较大,底板位移量非常小,这与围岩应力和塑性区分布规律的分析一致,因此考虑对两帮和顶板进行支护,底板不采取措施来控制巷道变形。虽然巷道两帮破坏程度有差异,但相差不大,因此为简化支护设计,两帮采用对称支护方式,取得了良好的支护效果。
In order to determine the optimal support mode and support parameters of the mining roadway in the first mining face of a mine, the numerical simulation method was used to simulate the plastic zone distribution and surface displacement under the condition of unsupported rectangular roadway. Through the analysis of the stress and plastic zone distribution of the surrounding rock in the rectangular roadway, it was found that the roof, floor and the middle of the two sides were the most seriously damaged in surrounding rock, and the damage extended deep in the surrounding rock perpendicular to the surface of the roadway. The maximum expand was the two sides, and the roof and the floor of the roadway were similarly extended, and the bottom corner was not damaged. The analysis of the displacement of the roadway showed that the displacement of the two sides and the roof of the rectangular roadway was large, and the displacement of the bottom plate was very small, which was consistent with the analysis of the distribution law of the stress and plastic zone of the surrounding rock. Therefore, it was considered to support the two sides and the roof. Measures were not taken to control the deformation of the roadway of the bottom plate. Although the degree of damage of the two sides of the roadway was different,the difference was not large. Therefore, in order to simplify the design of the support, the two sides adopted the symmetrical support method and achieved good support effect.
In order to determine the optimal support mode and support parameters of the mining roadway in the first mining face of a mine, the numerical simulation method was used to simulate the plastic zone distribution and surface displacement under the condition of unsupported rectangular roadway. Through the analysis of the stress and plastic zone distribution of the surrounding rock in the rectangular roadway, it was found that the roof, floor and the middle of the two sides were the most seriously damaged in surrounding rock, and the damage extended deep in the surrounding rock perpendicular to the surface of the roadway. The maximum expand was the two sides, and the roof and the floor of the roadway were similarly extended, and the bottom corner was not damaged. The analysis of the displacement of the roadway showed that the displacement of the two sides and the roof of the rectangular roadway was large, and the displacement of the bottom plate was very small, which was consistent with the analysis of the distribution law of the stress and plastic zone of the surrounding rock. Therefore, it was considered to support the two sides and the roof. Measures were not taken to control the deformation of the roadway of the bottom plate. Although the degree of damage of the two sides of the roadway was different,the difference was not large. Therefore, in order to simplify the design of the support, the two sides adopted the symmetrical support method and achieved good support effect.
引文
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[2]杨新顺,杨志强.巷道超前支架设计与力学特性研究[J].工矿自动化:1-7.
[3]师皓宇,马念杰,许海涛.基于能量理论的煤与瓦斯突出机理探讨[J].中国安全生产科学技术,2019,15(1):88-92.
[4]赵志强,马念杰,刘洪涛,等.巷道蝶形破坏理论及其应用前景[J].中国矿业大学学报,2018,47(5):969-978.
[5]潘一山.煤矿冲击地压扰动响应失稳理论及应用[J].煤炭学报,2018,43(8):2 091-2 098.
[6]康红普,王国法,姜鹏飞,等.煤矿千米深井围岩控制及智能开采技术构想[J].煤炭学报,2018,43(7):1 789-1 800.
[7]王爱文,潘一山,李忠华,等.冲击地压巷道锚杆-围岩系统复刚度特性[J].中国矿业大学学报,2018,47(1):183-189.
[8]康红普,冯彦军.煤矿井下水力压裂技术及在围岩控制中的应用[J].煤炭科学技术,2017,45(1):1-9.