大跨度破碎煤层巷道围岩控制及支护技术

针对王庄煤矿3045工作面回风顺槽跨度大、煤层破碎、巷道变形破坏严重的情况,为提高该巷道围岩控制质量,首先分析了大采高小煤柱巷道围岩的变形及受力特征;通过运用极限平衡理论合理确定煤柱尺寸、对大跨度破碎煤层巷道围岩控制机理进行分析,并结合王庄3045工作面实际情况给出了相应的围岩控制技术方案。基于原锚杆支护方案已不适应围岩控制要求,运用正交试验及数值模拟对原巷道支护参数进行优化。通过巷道表面及深部位移观测结果得知:沿空掘巷期间巷道表面最大位移量230 mm,工作面采动期间最大位移量1 049 mm,变化量均在工程允许范围内。工程实践证明围岩控制效果显著。研究实践结果对于其他大跨度破碎煤层条件下大采高小煤柱巷道围岩控制及支护参数选择具有指导意义。

Surrounding Rock Control and Supporting Technology of Roadway with Large Span and Broken Coal Seam

In view of the situations of No.3045 working face in Wangzhuang coal mine,such as large span of roadway,broken coal seam,and large deformation of roadway,the characteristics of the deformation and stress of roadway surrounding rocks with large mining height and narrow coal pillar is analyzed in order to improve the control ability of roadway.Through the limit equilibrium theory,the coal pillar size is reasonably determined,and the control mechanism of roadway surrounding rock with large span and broken seam is analyzed.Then,combined with the actual situation of No.3045 working face in Wangzhuang mine,the corresponding technical solutions for surrounding rock control is given.Since the original bolting program has not adapted the requirement of surrounding rock control,the original supporting parameters are optimized with application of orthogonal method and numerical simulation.The observation on displacement of roadway surface and deep roadway indicated that:maximum displacement of the roadway surface along goaf is 230 mm,maximum displacement during mining is 1 049 mm.These variations in the practical project are within the allowable range.Engineering practice has proved that this support technology has a significant effect on surrounding rock control.The research result provides guidance for controlling surrounding rock with large-span and broken seam and selecting the supporting parameters.