集中荷载作用下复合顶板工作面围岩失稳机理与控制  

Instability mechanism and control of surrounding rock in compositeroof working face under concentrated load

作　　者：张学亮 ZHANG Xueliang(CCTEG Coal Industry Planning Institute,Beijing 100120,China)

机构地区：[1]煤炭工业规划设计研究院有限公司,北京100120

出　　处：《煤炭科技》2024年第3期7-10,18,共5页Coal Science & Technology Magazine

基　　金：国家自然科学基金面上项目(52274161);煤炭工业规划设计研究院有限公司科技发展基金(博士创新基金)项目(GHYKY-ZL-2023-0002)。

摘　　要：多煤层逐层下行开采方式,在煤层距离较近或下煤层顶板为复合顶板时,上煤层遗留的煤柱集中载荷会对下煤层工作面顶板控制造成重大影响。通过理论分析、数值模拟、现场测试及验证,得出了集中荷载作用下复合顶板工作面矿压显现特征,认为采空区下方工作面存在大小周期来压现象,而煤柱下方区域压力普遍偏低,来压特征不明显。进一步分析认为,松散复合顶板围岩控制的核心在于控制顶板的早期离层和变形,支架对该类直接顶的给定变形压力应远大于其完整状态。提出了集中载荷作用下复合顶板工作面支护强度确定方法和针对煤柱应力影响区的浅孔注浆等围岩控制技术,为集中载荷作用下复合顶板工作面围岩控制提供了依据。The downward mining method of multiple coal seams layer by layer,when the distance between the coal seams is relatively close or the roof of the lower coal seam is a composite roof,the concentrated load of the residual coal pillars in the upper coal seam will have a significant impact on the control of the roof of the lower coal seam working face.Through theoretical analysis,numerical simulation,on-site testing and verification,the characteristics of mine pressure manifestation in the composite roof working face under concentrated load were obtained.It was believed that there was a phenomenon of large and small periodic pressure in the working face below the goaf,while the pressure in the area below the coal pillar was generally low,and the pressure characteristics were unclear.Further analysis suggested that the core of controlling the surrounding rock of loose composite roof was to control the early separation and deformation of the roof,and the given deformation pressure of the support on this type of direct roof should be much greater than its intact state.A method for determining the supporting strength of composite roof working face under concentrated load and shallow hole grouting technology for surrounding rock control in the stress affected area of coal pillars were proposed,providing a basis for controlling the surrounding rock of composite roof working face under concentrated load.

关 键 词：集中载荷 复合顶板 围岩控制 片帮冒顶 支护强度 

分 类 号：TD322[矿业工程—矿井建设]