沿空掘巷小煤柱稳定性分析

doi:10.11799/ce201405006

煤炭工程 ›› 2014, Vol. 46 ›› Issue (5): 18-20.doi: 10.11799/ce201405006

沿空掘巷小煤柱稳定性分析

刘飞,花锦波,神文龙

中国矿业大学矿业工程学院

收稿日期:2013-06-04 修回日期:2013-07-22 出版日期:2014-05-15 发布日期:2014-05-10
通讯作者: 刘飞 E-mail:fliucumt@163.com

Analysis on Stability of Coal Pillar when Keeping Small Coal Pillar to Dig the Lane along the Gob-side Entry Retaining

Received:2013-06-04 Revised:2013-07-22 Online:2014-05-15 Published:2014-05-10

摘要/Abstract

摘要：

摘要:沿留巷边缘留小煤柱沿空掘巷时巷道围岩的应力分布与稳定性都与典型条件下沿空掘巷有所不同。高强度的沿空留巷充填墙对采空区顶板起到支撑作用，有利于增加小煤柱的稳定性，减小合理煤柱留设宽度。本文采用数值计算软件FLAC3D，研究了不同煤柱宽度及锚杆支护强度对沿空留巷侧小煤柱稳定性及掘巷巷道围岩变形的影响，得出煤柱宽度是影响煤柱稳定性与巷道围岩变形的决定性因素,高系统支护强度能有效的控制巷道围岩变形的结论。针对朱集矿沿1111(1)工作面轨道平巷的工程背景，煤柱宽度为3m时，煤柱内垂直应力集中系数低，应力集中影响范围小，煤柱与掘巷巷道变形量最小，稳定性最好。在此基础上确立的高强度锚杆支护方案，成功保持了小煤柱的稳定性并控制住掘巷阶段巷道围岩的大变形。

关键词: 关键词：沿空留巷, 煤柱宽度, 沿空掘巷, 数值模拟, 锚杆支护

Abstract:

Abstract: The stress distribution and the stability of the roadway surrounding rock is deferent from the typical gob-side entry driving when keeping small coal pillar to dig the lane along the gob-side entry retaining. It will benefit to the stability of the coal pillar and decrease the width of the coal pillar because of the high strength filling wall of the gob-side entry retaining works to support the roof of the goaf. In this paper numerical calculation software was used to research the stability of small coal pillar along the gob-side entry retaining and the effect on the deformation of the surrounding rock in driving tunnel with different width of coal pillar and different anchoring strength of rock bolts, a conclusion was drawn that the width of the coal pillar is the decisive factor which affects the stability of the coal pillar and the deformation of surrounding rock, and the high system support strength can control the deformation of surrounding rock efficiently. According to the engineering background of the 1111(1) working face’s track drift in ZhuJi coal mine, the vertical stress of the coal pillar is low with a small influence circle and the deformation of the coal pillar and the roadway, it’s stability is best of all when the coal pillar is 3m wide. The high strength bolt supporting scheme was determined based on that basis. The stability of coal pillar and the big driving tunnel deformation were successfully controlled.

Key words: Key words: gob-side entry retaining, width of coal pillar, driving roadway along goaf, numerical simulation, bolt support

刘飞，花锦波，神文龙. 沿空掘巷小煤柱稳定性分析[J]. 煤炭工程, 2014, 46(5): 18-20.

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沿空掘巷小煤柱稳定性分析

Analysis on Stability of Coal Pillar when Keeping Small Coal Pillar to Dig the Lane along the Gob-side Entry Retaining

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