缓倾斜煤层沿空留巷围岩破坏规律与控制技术研究  

Research on the Failure Law and Control Technology of Surrounding Rock in the Goaf of Gently Inclined Coal Seams

作　　者：田立立 董柏林 TIAN Lili;DONG Bailin

机构地区：[1]遵义市播州区工业能源和科学技术局,贵州遵义563000 [2]中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京100083 [3]中国矿业大学(北京)力学与土木工程学院,北京100083

出　　处：《中国矿山工程》2024年第6期19-28,33,共11页China Mine Engineering

基　　金：贵州省科技计划项目(黔科合成果[2020]2Y019)无煤柱自成巷110工法关键技术及应用。

摘　　要：本文以西南地区试验矿井1811采煤工作面为工程背景,通过理论分析、数值模拟以及现场工业性试验等手段,建立了缓倾斜煤层沿空留巷围岩结构力学模型,研究了不同因素下缓倾斜煤层沿空留巷围岩变形破坏规律,并相应提出了柔性支护技术,进行了现场应用。研究表明:提高煤岩层交界面强度参数或提高支护强度是缩小极限平衡区的最有效方式。随着切顶角度、煤层倾角、巷道高宽差以及煤层埋深的增加,巷道围岩变形破坏越显著,巷道收缩率进一步加大,基本顶断裂程度明显增加。而随着基本顶厚度的增加,巷道围岩变形破坏程度越低。划分了巷道煤壁侧垂直应力及巷道覆岩演变的三阶段,可通过监测煤壁的应力变化进行巷道来压判别,实现巷道围岩灾害预控。研究结果可为西南地区缓倾斜煤层沿空留巷围岩控制提供参考。This article takes the 1811 coal mining face in the southwest region as the engineering background.Through theoretical analysis,numerical simulation,and on-site industrial testing,a mechanical model of the surrounding rock structure of the inclined coal seam along the goaf was established.The deformation and failure laws of the surrounding rock of the inclined coal seam along the goaf were studied under different factors,and flexible support technology was proposed accordingly,which was applied on site.Research has shown that increasing the strength parameters of the coal rock interface or enhancing the support strength is the most effective way to narrow the limit equilibrium zone.As the cutting angle,coal seam inclination angle,height width difference of the roadway,and coal seam burial depth increase,the deformation and damage of the surrounding rock of the roadway become more significant,the shrinkage rate of the roadway further increases,and the degree of basic roof fracture significantly increases.As the basic roof thickness increases,the degree of deformation and damage of the surrounding rock in the tunnel decreases.The three stages of vertical stress on the coal wall side of the roadway and the evolution of overlying rock in the roadway have been divided,and the roadway can be judged by monitoring the stress changes of the coal wall to achieve pre control of surrounding rock disasters in the roadway.The research results can provide reference for controlling the surrounding rock of the roadway along the goaf of gently inclined coal seams in the southwest region.

关 键 词：沿空留巷 破坏规律 缓倾斜煤层 柔性支护 

分 类 号：TD823[矿业工程—煤矿开采]