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特厚煤层沿空掘巷围岩变形失稳机理及其控制对策
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摘要
特厚煤层沿空掘巷围岩稳定性问题是国内外岩石力学和采矿学界关注的焦点问题。本文以神华宁夏煤业集团公司汝箕沟矿为工程背景,针对太西煤特厚煤层综采面沿空掘巷围岩变形失稳机理及其控制对策进行了深入系统的研究,对于特厚煤层开采减少煤炭损失、降低巷道支护成本、提高经济效益、保证矿井安全生产具有重要意义,对于汝箕沟矿区及我国中西部特厚煤层安全开采具有一定的借鉴意义和工程实用价值。
     本文以“实用矿山压力控制理论”为指导,综合运用岩石力学、采矿学、软岩工程力学、材料力学、工程地质学等多学科理论,采用理论分析、室内实验、数值模拟和现场试验相结合的研究方法,建立了汝箕沟矿特厚煤层的覆岩运动和支承压力分布的围岩动态“结构力学模型”,确定其相关结构参数;揭示了其沿空巷道侧向应力分布时空规律,确定了内外应力场范围、峰值,内应力场小煤柱沿空掘巷的最佳位置、时间和合理尺寸;得出了在内应力场范围内掘巷,小煤柱主要以隔离采空区为主,承载为辅的重要结论;揭示了特厚煤层分层同采不同采动时空条件下,沿空掘巷围岩失稳机理,提出了相应的控制对一策。本文研究为特厚煤层无煤柱开采工作面区段煤柱留设与上覆岩层防控技术、采场布置合理参数与安全全正常接续方案的确定提供了重要的科学依据。
The surrounding rock stability control of the gob-side entry driving in the extra-thick coal seam is the focal point question of rock mechanics and mining academic at home and abroad. With the engineering background of Rujigou Coal Mine of Ningxia Shenhua Coal Group Company, this paper carry out systematical research in extra-thick coal seam compound mining along goaf roadway deformation instability mechanism and control countermeasures of Taixi Coal. It has a significance for extra-thick coal seam to reduce coal loss and the cost of roadway support,enhance economic efficiency and ensure mine production safety. It also has certain reference significance and practical value for extra-thick seam security exploitation of Rujigou Coal Mine area and central and western China.
     With the guidance "practical mine pressure control theory", This article integrated applies rock mechanics, mining science, soft rock engineering mechanics, material mechanics, engineering geology science theory and so on, adopts combining research method of theoretical analysis, indoor experiment, numerical simulation and field test, established the "structure mechanics model" of the overlying strata rock movement of the extra-thick coal seam and the support pressure distribution rule of the mine,and confirmed the relevant parameter, through the research route of theoretical study, numerical simulation computation, field observation and various other methods, proclaim the
     space-time regular pattern of the side direction stress distribution in the gob-side entry retaining,as well as the inside and outside stress field, peak, the paper established the elastic-plastic soften model, and determined the optimum position, time and rational space of the gob-side entry driving with small pillars under the inner stress field. It obtained a major consequence that small pillars were used to seclude the gob area primarily and support as auxiliary under the range of the inner stress field. It also revealed the instability and stability mechanism of the gob-side entry driving in the extra-thick coal seam in the different time and space high seam, and put forward corresponding control measures. As an consequence it could provide an important scientific basis for the coal pillar set for the mining work face area of the extra-thick coal seam, the technology of the overlaying strata technology, the reasonable parameters for the stope decorate and the determination of a safe normal continuous project.
引文
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