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在大倾角煤层走向长壁工作面综放开采沿倾斜方向能形成老顶稳定结构的理论基础上,建立了一种能够描述较破碎老顶结构的力学模型,通过引入相似材料模拟实验得到的煤岩体参数,求解得到了本研究中的老顶稳定结构的力与位移关系式,可用于分析评价老顶结构的阻水性能。现场工作面以及采空侧的出水监测数据揭示了老顶稳定结构具有阻水性,验证了本文建立的老顶结构力学模型的合理性。计算结果显示老顶稳定结构的阻水效果受到煤层倾角的影响,推导了35°~55°倾角较破碎煤层老顶结构起到阻水作用所需的最小采深关系式,可为现场地表水害分区段治理提供理论依据。
Based on the theory that the fully mechanized top-caving mining with long inclined face to longwall face can form a stable roof structure along the slope, a mechanical model capable of describing the crushed roof structure was established. By introducing similar materials to simulate the experiment, The relationship between the force and displacement of the roof stabilized structure in this study is obtained by solving the rock mass parameters and can be used to analyze and evaluate the water blocking performance of the roof structure. The monitoring data of the working face and the gob-side outlet water reveal that the stable structure of the old roof has water-blocking property and verified the rationality of the mechanical model of the old roof structure established in this paper. The calculated results show that the water blocking effect of the stabilized structure of old roof is affected by the dip of coal seam. The minimum depth of cut necessary for the water blocking effect of the old roof structure with the angle of 35 ° ~ 55 ° compared with that of the broken coal seam is deduced. Sub-section provides a theoretical basis for governance.