薄煤层石灰岩顶板巷旁充填沿空留巷关键参数研究与应用

doi:10.11799/ce201807002

摘要/Abstract

摘要： 以南屯煤矿3602工作面巷旁充填沿空留巷为工程背景，对薄煤层石灰岩顶板巷旁充填沿空留巷关键参数进行研究。通过室内试验测试石灰岩顶板的物理力学性质，并分析留巷过程中石灰岩顶板垮落形式，建立巷旁充填沿空留巷切顶力学模型，确定薄煤层石灰岩顶板巷旁充填沿空留巷的关键参数为巷旁充填体的切顶阻力和宽度，并给出相应的切顶阻力计算式。研究结果表明：当直接顶厚度远大于煤厚时，巷旁充填体应具有足够的切顶阻力和适当的宽度，满足直接顶在采空侧被整体切落的要求。研究成果在现场实践中成功应用，对于巷旁充填沿空留巷技术在薄煤层开采中的推广应用具有重要借鉴意义。

关键词: 薄煤层, 沿空留巷, 石灰岩顶板, 切顶阻力

Abstract: Based on the engineering background of gob-side entry retaining with roadside backfill in panel 3602 of Nantun Colliery, the key parameters of gob-side entry retaining with roadside backfill in thin coal seams with the limestone roof (GERRB-TCS-LR) were studied. The caving style of the limestone roof during the retaining stage was analyzed based on testing the physical and mechanical properties of limestone roof in the laboratory. Considering the caving style, the roof-cutting mechanical model of gob-side entry retaining with roadside backfill was established, the roof-cutting resistance and width of the roadside backfill body were determined as the key parameters for GER-TCS-LR, and the roof-cutting resistance formula was derived. The research results show that if the immediate roof height is greater than the seam height, the roof-cutting resistance and width of the roadside backfill body should meets the requirement of the immediate roof being totally cut along the goaf. The roof-cutting resistance and width of the roadside backfill body were confirmed based on those research results by theoretical calculation and numerical calculation. The research results are applied into the engineering practice successfully, which have great significance to popularize the technique of gob-side entry retaining with roadside backfill in thin coal seams.

中图分类号:

TD322

王玉峰. 薄煤层石灰岩顶板巷旁充填沿空留巷关键参数研究与应用[J]. 煤炭工程, 2018, 50(7): 5-9.

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