大采高沿空留巷围岩分位控制对策与矿压特征分析

采矿与安全工程学报 ›› 2012, Vol. 29 ›› Issue (4): 466-473.

大采高沿空留巷围岩分位控制对策与矿压特征分析

1．中国矿业大学安全工程学院，江苏徐州 221116；2．深部煤炭开采与环境保护国家重点实验室，
安徽淮南 232001；3．中国矿业大学矿业工程学院，江苏徐州 221116

收稿日期:2011-11-17 出版日期:2012-07-15 发布日期:2012-05-23
作者简介:薛俊华（1963-），男，江苏省泰州市人，教授级高工，博士，从事煤与瓦斯共采理论及技术研究。 E-mail：xuejunhua2003@163.com Tel：0554-7624616
基金资助:
国家重点基础研究发展计划（973）项目（2010CB735506）

Strata Behavior and Control Countermeasures for the Gob-Side Entry Retaining in the Condition of Large Mining Height

Received:2011-11-17 Online:2012-07-15 Published:2012-05-23

摘要/Abstract

摘要： 结合沙曲矿24207工作面的生产条件，运用理论分析和数值模拟方法探讨了采高因素影响下沿空留巷顶板应力的分布特性，得到了4.2 m大采高条件下留巷全断面变形分布特征。沿空留巷处于采空区侧向支承应力区的应力降低带；工作面采高越大，则其对岩层活动的影响幅度及范围就越广；大采高沿空留巷采动期间将发生剧烈变形，断面收缩率达到55.3%，需针对留巷各个边位的变形特征分别采取有效的支护控制对策；留巷断面选择最优跨高比并采用以高初撑力为核心的高强支护体系，能够合理控制围岩变形。工业性试验及观测数据表明，留巷受采动剧烈影响范围为工作面至后方200 m，与工作面倾斜长度相当，该范围内巷道变形持续增长，顶板压力不断增加，工作面后方250 m以外，矿压显现趋于稳定。

关键词: 大采高, 沿空留巷, 围岩控制, 矿压显现

Abstract: Combined with the production conditions of 24207 working face in Shaqu mine, distribution characteristics of roofs stress for gob-side entry retaining influenced by mining height was studied by the method of theoretical analysis and numerical simulation. Gob-side entry retaining is in the area of stress decreasing zone of bearing pressure area. The impact scope and range to the rock gets more widely with the increase of mining height of working face. Acute deformation will occur during the mining period for gob-side entry retaining, and the contraction of area will reach to 55.3% in the condition of large mining height. Effective supporting measures are required according to the deformation characteristics of each side in gob-side entry retaining. The optimal cross-height ratio and the high strength supporting system with the core of high pre-stress could be helpful to control the deformation of surrounding rock reasonably. The observation data shows that the violent mining influence extent to gob-side entry retaining is the ranges from working face to the rear of 200 m, which is similar to the length of working face in the industrial experiment. The deformation continues to grow and roof pressure continues to increase until the length extents 250 m the strata behaviors tends to stable.

Key words: large mining height, gob-side entry retaining, surrounding rock control, strata behaviors

薛俊华, 韩昌良. 大采高沿空留巷围岩分位控制对策与矿压特征分析[J]. 采矿与安全工程学报, 2012, 29(4): 466-473.

XUE Jun-Hua, HAN Chang-Liang. Strata Behavior and Control Countermeasures for the Gob-Side Entry Retaining in the Condition of Large Mining Height[J]. Journal of Mining & Safety Engineering, 2012, 29(4): 466-473.

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