煤柱宽度对沿空巷道围岩影响分析

为了研究煤柱宽度对沿空巷道围岩的影响作用,以陈四楼煤矿深部沿空送巷为工程背景,采用二维有限差分软件FLAC2D建立二维数值模型对同一开采深度条件下不同护巷煤柱宽度对围岩的影响进行数值计算分析。分析结果表明,随着煤柱宽度的增大,沿空巷道围岩应力逐渐提高,在煤柱宽度较窄时,巷道围岩处于低应力区,当煤柱宽度达到一定程度时,低应力在煤柱中部被分割开,煤柱中部核心区域出现应力增高区。在沿空巷道下帮煤体内、深度大致在6～8m范围内,将会出现垂直应力高峰区。一般最好选择煤柱宽度在2～4m范围内。

Analysis of the impact of width of coal pillar on the surrounding rock of the gob-side entry

In order to study the impact of the width of coal pillar on the surrounding rock of the gob-side entry,taking the deep gob-side entry in Chensilou Coal Mine as the engineering background,the paper adopts the finite difference software FLAC2D to build two-dimension numerical model to calculate and analyze the impact of the coal pillar in different width on the surrounding rock in the conditions of the same mining depth.The results indicate that the surrounding rock stress of the gob-side entry will gradually rise with the coal pillar width increasing;when the pillar width is small the surrounding rock will be in low stress zone;the low stress will be segmented at the middle part of the coal pillar when the pillar width is up to a certain extent,and stress increasing zone will appear at the core area in middle part of the coal pillar.Vertical stress peak zone will emerge in a depth of 6~8m in the coal body of lying side of the gob-side entry and so it is better to remain a coal pillar in a width of 2~4m.