沿空留巷顶板非对称锚固深梁承载结构模型研究及应用  

Research and application of asymmetric anchorage deep beam bearing structure model in gob-side entry retaining roof

作　　者：谢生荣[1,2] 张晴 陈冬冬[1] 程琼[1] 祁鹏宇 肖海滨 闫志强 孙军军 朱利军 XIE Shengrong;ZHANG Qing;CHEN Dongdong;CHENG Qiong;QI Pengyu;XIAO Haibin;YAN Zhiqiang;SUN Junjun;ZHU Lijun(School of Energy and Mining Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining&Technology-Beijing,Beijing 100083,China;Hexi Coal Mine,Shanxi Fenxi Mining Industry Group Co Ltd,Liulin,Shanxi 033300,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083 [3]山西汾西矿业(集团)有限责任公司贺西煤矿,山西柳林033300

出　　处：《采矿与安全工程学报》2020年第2期298-310,共13页Journal of Mining & Safety Engineering

基　　金：中国博士后科学基金项目(2019M650895);中国矿业大学(北京)“越崎青年学者”资助计划项目(800015Z1104);中央高校基本科研业务费专项资金项目(2010QZ06);国家自然科学基金项目(51504259)。

摘　　要：针对强采动条件沿空留巷顶板非对称变形与控制难题,以贺西煤矿3302(2)沿空留巷为工程背景,采用数值模拟、理论分析及现场工程实践相结合的方法研究沿空留巷顶板非对称锚固深梁承载结构的形成机制与承载特性。基于顶板预应力场的分布特征,提出在高预应力顶板锚索和锚杆支护产生的有效预应力场作用下顶板的有效锚固区能形成非对称锚固深梁承载结构,进而构建非对称锚固深梁承载结构力学模型且根据应力叠加原理推导其最大剪应力解析式;结合MATLAB绘图阐明不同顶板载荷、非对称布置的单体支柱和顶板锚杆索的单一和复合影响因素作用下锚固深梁结构最大剪应力分布的响应特征,并分析锚固深梁结构和两帮(柔模墙体和煤帮锚固体)协同承载机理,从而揭示锚固深梁结构稳定性承载机制。基于此,结合生产地质条件和工程经验提出3302(2)沿空留巷非对称联合支护方案,实践表明留巷期间围岩移近量控制在安全范围内,沿空留巷非对称锚固深梁承载结构有效控制强采动巷道顶板的非对称变形。In order to solve the problem of asymmetric deformation and control of gob-side entry retaining roof under strong mining,with gob-side entry retaining 3302(2)in Hexi Coal Mine as the engineering background,the formation mechanism and bearing characteristics of asymmetric anchorage deep beam bearing structure of gob-side entry retaining roof have been studied through numerical simulation,theoretical analysis and field engineering practices.Based on the distribution characteristics of prestressed field in roof,it is proposed that the asymmetric anchorage deep beam bearing structure in the effective anchorage zone of the roof can be formed under the function of effective prestressed field generated by high prestressed roof anchor cables and bolts support.Furthermore,the mechanical model of an asymmetric anchorage deep beam bearing structure has been constructed,and the analytical expression of maximum shear stress has been derived according to the principle of stress superposition.The response characteristics of the maximum shear stress distribution in anchorage deep beam structure under the functions of single and compound influencing factors of different roof loads,single props asymmetrically arranged,and roof bolts and anchor cables asymmetrically arranged have been illustrated combined with MATLAB drawing.Moreover,the cooperative bearing mechanism of the anchorage deep beam structure and two ribs(flexible formwork wall and anchorage body in coal rib)has been analyzed.Thus,the stability bearing mechanism of anchorage deep beam structure has been revealed.Based on the above results,the asymmetric combined support scheme for gob-side entry retaining 3302(2)has been proposed combined with production and geological conditions,and engineering practice.Practice has shown that the convergence of surrounding rock is controlled in safety range during retaining roadway,which reflects that the asymmetric deformation of strongly mining-induced roadway roof can be effectively controlled by asymmetrical anchorage deep beam bea

关 键 词：沿空留巷顶板 高预应力锚索 非对称锚固深梁承载结构模型 最大剪应力分布 

分 类 号：TD353[矿业工程—矿井建设]