大倾角煤层综放开采老顶力学结构阻水性探讨

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。

Discussion on the Water Resistance of the Broken Main Roof Structure of the Steep Coal Seam with Fully-mechanized Mining

The main broken roof of the steep long-wall coal seam with full-mechanized caving mining can perform a stable structure in the direction of inclination.The relationship between force and displacement of this stable structure was obtained by introducing the parameters of coal and rock mass from similar material simulation experiments,which can evaluate and analyze the water resistance performance of the main roof.Water monitoring data of working face and goaf side reveals the water resistance of the main roof structure and verifies the rationality of the main roof structure.Calculation results show that the water resistance effect of the main roof is affected by the dip angle of coal seam.The relationship between dip angle and the minimum mining depth of the coal seam with angle from 35° to 55° is deduced,which can provide a theoretical basis for governing surface water disasters according to different periods.