大采高大断面沿空巷道围岩控制技术研究  

Surrounding rock control technology for large section gob-side entry in high-cutting working face

作　　者：郅荣伟 ZHI Rong-wei(Shanxi Engineering Vocational College,Taiyuan 030001,China)

机构地区：[1]山西工程职业学院,山西太原030001

出　　处：《煤炭工程》2022年第4期27-33,共7页Coal Engineering

基　　金：山西省自然科学基金面上项目(201701D121136)。

摘　　要：针对大采高、大断面沿空巷道变形大及难以控制问题,以红庆河煤矿3402工作面为背景,建立沿空掘巷顶板岩梁力学模型,采用理论计算推导出采空区侧向基本顶破断位置计算公式,得出3402工作面侧向基本顶位于煤壁内3~3.5m处破断,利用FLAC;模拟软件分析沿空巷道不同煤柱宽度、不同工作面采高、不同巷道跨度的巷道应力特征,揭示了大采高沿空掘巷围岩变形破坏机理。结果表明:煤柱小于等于6m时煤柱峰值承载应力相对较小,工作面采高增加煤柱内稳定承载区域逐渐收缩减小,巷道跨度增加顶底板偏应力低值区范围扩大,顶板稳定性降低,根据深部大采高大断面沿空巷道应力分布特征,确定了煤柱宽度为6m,通过实施支护优化方案,取得了较好的现场效果。In view of the large deformation and control difficulty of the large section gob-side entry in high-cutting working face,taking the 3402 working face of Hongqinghe Coal Mine as the research background,the formula is deduced by theoretical calculation for the breaking position of lateral main roof of the gob.It is concluded that the lateral basic roof of 3402 working face broke at 3~3.5 m inside of the coal wall.FLAC;simulation software is used to analyze the stress characteristics of gob-side entry with different coal pillar width,mining height and entry span,the results show that the peak bearing stress of coal pillar is relatively small when the coal pillar is less than or equal to 6 m;as the mining height of the working face increases,the stable bearing area in the coal pillar gradually shrinks;as the entry span increases,the range of low partial stress area expands in the roof and floor,and the stability of roof decreases.According to the stress distribution characteristics,the width of coal pillar is determined to be 6 m,and through optimizing the support scheme,favorable field effect is achieved.

关 键 词：大采高 大断面 沿空巷道 围岩控制 

分 类 号：TD353[矿业工程—矿井建设]