基于偏应力分布特征的综放区段煤柱宽度研究
Study on Pillar Width in Fully-mechanized Caving Section Based on Distribution of Deviatoric Stress
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摘要: 针对王家岭煤矿20 m宽煤柱条件下回采巷道大变形控制难题，运用数值模拟方法，研究了顶板煤岩体偏应力第二不变量分布及迁移演化规律，得出203盘区相邻综放区段间煤柱合理宽度为4～8 m，且回采巷道煤柱侧顶板需要进行强化支护的结论。现场试验8 m宽煤柱，采用槽钢桁架锚索与单体锚索平行布置非对称支护技术支护20321综放工作面回风巷，顶板最大下沉量为102 mm，煤柱宽度留设合理。Abstract: For the control problem in large deformation of mining roadway with 20 m width coal pillar in Wangjialing Coal Mine, the distribution and migration of the second invariant deviatoric stress of roof rock and coal was researched by numerical simulation. The research results show that the optimal pillar width is 4 m to 8 m between adjacent caving mining sections in 203 panel, and the asymmetric support technique is needed to carry out reinforced support. The 8 m pillar was tested first in field, and the parallel-arranged asymmetric support technology composed of channel steel truss cable and single cable was applied at 20321 fully mechanized caving face return roadway. The maximum roof subsidence is 102 mm, and the design width of coal pillar is reasonable.
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