坝下深部煤层开采坝体移动变形规律的数值模拟
Numerical simulation on dam movement and deformation law of deep coal seam mining under dam
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摘要: 针对坝体下深部煤层综放开采坝体结构小、煤层埋藏深度大，坝体结构高度与煤层埋藏深度比值较大，常规方法难以推算坝体结构的移动变形规律的问题，提出将地表和坝体结构的移动变形分开研究，定量分析地表移动变形下坝体结构的移动变形，获取了坝体结构随工作面不同推进长度下的移动变形规律，建立了坝下深部煤层开采坝体结构局部放大的时空序列反演机制。以某矿坝下工作面开采为例，研究结果表明：数值模拟得到坝体的最大下沉值为7.17 m，与实测结果7.077 m相比，绝对误差为0.093 m。Abstract: In view of the problems of small dam structure, large buried depth of coal seam and large ratio of dam structure height to buried depth of coal seam, it is difficult to calculate the movement and deformation law of dam structure by conventional methods. It is proposed to separate the movement and deformation of the surface and the dam structure, quantitatively analyze the movement and deformation of the dam structure under the surface movement and deformation, obtain the movement and deformation law of the dam structure with different advancing lengths of the working face, and establish the space-time sequence inversion mechanism of local amplification of the dam structure in deep coal seam mining under the dam. Taking the mining of the working face under the dam of a mine as an example, the research results show that the maximum subsidence value of the dam body obtained by numerical simulation is 7.17 m, and the absolute error is 0.093 m compared with the measured result of 7.077 m.
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Keywords:
- dam /
- deep coal seam /
- movement deformation /
- numerical simulation /
- local amplification
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