叠加开采下浅埋煤层裂隙演化与连通特征
发布时间：2019-06-22 14:11
【摘要】：浅埋近距离煤层群上覆岩层受重复采动影响,裂隙叠加发育易形成采空区与地表连通。以典型近距离开采煤层群为例,采用物理模拟实验和数值分析的方法对上、下煤层开采过程中上覆岩层的裂隙演化时空规律和应力分布特征进行了模拟。结果表明:两煤层开挖结束后,裂隙高度呈驼峰式分布,沿倾向和走向方向的两侧上方形成了较为明显的应力集中区;上部煤层开挖结束后,最大竖向裂隙发育高度为75 m,但并未连通地表;随着下部煤层开挖,裂隙重复发育,裂隙高度随工作面推进逐渐增加,两侧裂隙率先与地表连通。
[Abstract]:The overlying strata of shallow buried and close distance coal seam group are affected by repeated mining, and the goaf is easy to be connected with the surface by the superimposed development of fissures. Taking the typical close mining coal seam group as an example, the temporal and spatial law of fracture evolution and stress distribution characteristics of overlying strata in the process of upper and lower coal seam mining are simulated by means of physical simulation experiment and numerical analysis. The results show that after the excavation of the two coal layers, the crack height is humped, and an obvious stress concentration area is formed along both sides of the tendency and strike direction; after the excavation of the upper coal seam, the maximum vertical fracture development height is 75 m, but it is not connected to the surface; with the excavation of the lower coal seam, the crack development is repeated, the crack height increases gradually with the advance of the working face, and the cracks on both sides are first connected to the surface.
【作者单位】： 西安科技大学能源学院;西部矿井开采及灾害防治教育部重点实验室;中国矿业大学安全工程学院;煤矿瓦斯与火灾防治教育部重点实验室;
【基金】：国家自然科学基金重点资助项目(51134019);国家自然科学基金青年科学基金资助项目(51404195)
【分类号】：TD31;TD752.2
，
本文编号：2504657
[Abstract]:The overlying strata of shallow buried and close distance coal seam group are affected by repeated mining, and the goaf is easy to be connected with the surface by the superimposed development of fissures. Taking the typical close mining coal seam group as an example, the temporal and spatial law of fracture evolution and stress distribution characteristics of overlying strata in the process of upper and lower coal seam mining are simulated by means of physical simulation experiment and numerical analysis. The results show that after the excavation of the two coal layers, the crack height is humped, and an obvious stress concentration area is formed along both sides of the tendency and strike direction; after the excavation of the upper coal seam, the maximum vertical fracture development height is 75 m, but it is not connected to the surface; with the excavation of the lower coal seam, the crack development is repeated, the crack height increases gradually with the advance of the working face, and the cracks on both sides are first connected to the surface.
【作者单位】： 西安科技大学能源学院;西部矿井开采及灾害防治教育部重点实验室;中国矿业大学安全工程学院;煤矿瓦斯与火灾防治教育部重点实验室;
【基金】：国家自然科学基金重点资助项目(51134019);国家自然科学基金青年科学基金资助项目(51404195)
【分类号】：TD31;TD752.2
，
本文编号：2504657
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