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基于国阳一矿8907综放工作面端头顶板破断特征,建立了采空侧端头三角块结构力学模型,理论及数值模拟分析三角煤失稳机理.结果表明:三角煤区域受本工作面及相邻工作面采动共同影响,应力集中且处于弹塑性区交界处,发生塑性破坏,端头控顶范围增加.不同护巷煤柱尺寸影响采空侧端头围岩应力分布进而影响三角煤的稳定性,将护巷煤柱尺寸由12 m增加至20m能够有效地控制三角煤失稳.在已有的12 m护巷煤柱下,提出采用马丽散注浆加固三角煤及其围岩,据此在81101工作面进行工业性试验,取得了较好效果.
Based on the fracture characteristics of head roof of 8907 fully mechanized caving mining face in Guoyang Mine, a mechanics model of gob-end triangular block was established and the mechanism of triangular coal instability was analyzed theoretically and numerically.The result shows that the triangular coal area is affected by the working face And the mining face of the adjacent working face, the stress concentration and at the junction of the elastic-plastic zone, the plastic failure occurs, and the range of head control increases. The size of the coal pillar affects the triangle The stability of coal and the increase of bollards size from 12 m to 20 m can effectively control the instability of the triangular coal.Under the existing 12 m roadway retaining coal pillar, Surrounding rock, thus 81101 working face for industrial test, and achieved good results.