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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。
Taking the safety of mining face with large coal pillar left under the condition of huge coal seam in Gaochuan coal mine in Jining, Shandong Province, this paper studies the coordinated deformation model and its stability of huge thick rock pillars system by theoretical analysis and engineering practice . Main research contents and conclusions: (1) Under the condition of satisfying the fracture line factors and bearing strength factors of coal seam roof rock strata, the coal pillar can “isolate” the goaf and form the “ (2) Based on the deformation of huge thick strata and the vertical ”compression“ deformation of coal pillar, a mechanics model of coordinated deformation of huge rock strata-coal pillar was established to analyze the stress of vertical deformation of coal pillar Source, form and overall coordinate deformation mechanism, get the stress-strain relationship of the coordinated deformation of huge rock-coal pillar system; (3) investigate the type and criterion of instability and influence on underground dynamic disasters , Proposed disaster prevention and control technology. Based on the research results, the stability of pre-mining thick coal seam-pillar system in No. 1102 working face 3 and the prediction of the disaster are analyzed. According to the microseismic monitoring results and dynamic manifestations in the recovery stage, the rationality of the study is verified preliminarily. Preventive measures, and ultimately achieve the face of ”earthquake without disaster," the purpose of safe recovery.