巨厚岩层–煤柱系统协调变形及其稳定性研究

以山东济宁高庄煤矿巨厚岩层条件下留设大煤柱的工作面回采安全性为背景,采用理论分析和工程实践等方法,研究巨厚岩层–煤柱系统的协调变形模型及其稳定性。主要研究内容和结论:(1)在满足煤柱顶板岩层断裂线因素和支承强度因素的情况下,煤柱能够"隔离"采空区并对巨厚岩层及其覆岩结构形成"支撑"作用;(2)以巨厚岩层挠曲变形和煤柱竖直方向"压缩"变形为基础,建立巨厚岩层–煤柱协调变形力学模型,分析煤柱竖直变形的应力来源、形式和整体协调变形机制,得到巨厚岩层–煤柱系统协调变形的应力–应变关系;(3)探讨巨厚岩层–煤柱系统失稳类型、判据和对井下动力灾害发生的影响,提出灾害防治技术。运用研究成果分析3上1102工作面采前巨厚岩层–煤柱系统稳定性,并对灾害进行预测,根据回采阶段微震监测结果与动力显现情况,初步验证了研究的合理性,通过实施针对性预防措施,最终实现了工作面"有震无灾"的安全回采目的。

Study of the compatible deformation and stability of the system of super thick strata and coal pillars

This study investigated the compatible deformation model and the stability of the system of super-thick strata and coal pillars based on the recoverability safety of a longwall panel with large coal pillars under super-thick strata in Gaozhuang mine in Jining，Shandong province，China. The coal pillar was found to be able to isolate the gob and support the super thick strata and the overburden structure. The compatible deformation model for super-thick strata and coal pillars was established on the basis of the flexural deflection of super-thick strata and the vertical compressive deformation of coal pillars. The stress source，form as well as the entire compatible deformation mechanism of the vertical deformation of coal pillars were analyzed. The stress-strain relation of the compatible deformation for the system was deduced. The mode and criterion of system instability and its impact on dynamic disasters under mines were discussed. The disaster prevention and control techniques were proposed. The research results were applied to analyze the system stability of 3up1102 Longwall Panel before mining，and the disasters were forecasted. The rationality of the research was initially verified according to the micro-seismic monitoring results and the dynamic stress conditions at the recoverability stage. The purpose of quake without disasters has achieved through implementing the targeted preventive measures.