迎采动面沿空掘巷围岩变形规律及控制技术

迎采动面沿空掘巷经历邻近工作面侧向基本顶断裂、转动及稳定的全过程动压影响后,巷道围岩将产生大变形、维护困难.采用理论分析、数值计算和现场试验研究迎采动面沿空掘巷围岩变形规律和控制技术,得到该类巷道受邻近工作面采动影响后围岩呈现非对称变形,窄煤柱和顶板变形剧烈,提出提高窄煤柱和顶板支护强度使围岩形成有效承载体是保持迎采动面沿空掘巷整体稳定的关键,据此提出了合理的围岩控制技术:1)合理确定窄煤柱宽度,使邻近工作面采动影响稳定后巷道处于应力降低区；2)高强度大延伸率锚杆控制围岩变形；3)加强窄煤柱、顶板支护,提高关键部位承载能力.棋盘井煤矿工程实践表明,该技术有效控制了该类巷道围岩变形量,取得了良好效果.

The Surrounding Rock Deformation Rule and Control Technique of the Roadway Driven Along Goaf and Heading for Adjacent Advancing Coal Face

The roadway driven along goaf and heading for adjacent advancing coal face was in full procedure influenced by the dynamic pressure occurred by the lateral main roof broken,turned and stabilized of the upper sectional coal face,the surrounding rock would occur large deformation and difficult to maintain.This paper researched the surrounding rock deformation rule and control technique by theoretical analysis,numerical calculation and field test.The result shows that this roadway would occur asymmetrical deformation,small coal pillar and roof deformed greatly,improve support strength of small coal pillar and roof was the key to remain the roadway stable.According to the research,the better supporting technology is shown as follows: 1)Reasonably determine the width of small coal pil-lar,kept roadway in stress decreasing zone;2)High strength and large elongation anchor controlled deformation of surrounding rock;3)Reinforced support of the small coal pillar and roof to improve the carrying capacity of key parts.According to the engineering application in Qipanjing Mine,the sup-porting technology effectively controlled the deformation of surrounding rock of roadway,and achieved good results.