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长壁孤岛工作面冲击地压机理及防冲技术研究
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摘要
本文通过现场调查分析了孤岛工作面发生冲击地压的主要诱因,总结了地质构造、工作面开采深度、煤岩体物理力学特性、工作面开采条件对冲击地压的影响规律。以开滦集团唐山矿T2193孤岛工作面为现场实例,通过顺槽巷道表面位移、顶板离层、工作面回采过程中的电磁辐射监测、巷道内钻屑量的现场监测结果确定了巷道顶板受工作面动压影响的剧烈的区域,通过支架载荷的监测确定了顶板周期来压步距。运用强度理论、能量理论研究了工作面不同埋深、不同地应力场、不同煤层厚度和煤岩体材料的各向异性对孤岛工作面冲击地压的影响特征,分析了孤岛工作面应力场和能量场的变化规律,结合现场监测结果,确定了孤岛工作面发生冲击失稳的危险区域。针对孤岛煤柱冲击失稳的动态力学状态,研究了孤岛工作面回采过程中不同煤柱宽度情况下煤柱应力场、位移场和塑性破坏区的变化规律,进一步分析了不同宽度条件下煤柱支承压力和弹性核随工作面回采的动态变化规律,对孤岛煤柱发生冲击失稳的可能性进行了动态预测。采用数值分析方法研究了在工作面回采过程中,在顺槽巷道采用超前卸压孔的卸压效果,分析了布置孔径d,孔间距a和孔深l的优化参数。本文的研究对于孤岛工作面安全开采和煤柱保护具有科学意义和工程指导价值。
According to the numerious studies on the geological structure, depth of the mining face, properties of the coal seam and coal mining technology, the incentive of coal bump in island mining face is analysed. The strength theory, energy theory and liability theory is applied to research the mechanism of coal bump which is triggered on the island mining face. Meanwhile, the different depth of mining face, groundstress and anistropic of the coal and rock are considered in the FLAC3D numerical modeling to study the factor of coal bump. The distribution of stress field and energy field is also analysed in the numerical study according the geology of T2193A mining face of Tangshan coal mine. The dynamic mechanical process of coal pillar located on the beside of island mining face is anther objective of this study. For the purpose of dynamical forecasting the coal bump of coal pillar, the abutment pressure, plastic state and energy field during the mining process is investigated. In satisfying this objective of estimate of the burst risk in island longwall mining face, T2193A mining face of Tangshan coal mine is chosen to conduct a field experiment. In this experiment, roof displacement and electromagnetic radiations in roadway are investigated to determinate the region where the deformation of the roadway roof is most intense. Numerical model is established to further verify the results of field experiment and to divide burst-prone region of island mining face and coal pillar. According to these researches, the technology of stress pre-releasing by borehole is investigated by numerical method. The effect of different length and interval of boreholes to released stress is estimated. Modeling results suggest that the abutment pressure could be released by all kinds of boreholes with different length and interval parameter. The research of this study has important academic and engineering significances to keep miner safety and efficient production of coal mines.
引文
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