摘要
针对区段煤柱留设宽度过大,造成矿井资源损失的问题,以韩家洼煤矿为研究背景,分别考虑巷道及采空区侧向支承压力对煤柱影响的差异,运用理论分析的方法,得到了煤柱中部弹性区宽度及两侧边缘极限平衡区宽度。运用FLAC;软件模拟研究了超前工作面5 m围岩屈服破坏特征以及不同煤柱宽度垂直应力分布曲线,并结合现场观测所得巷道顶底板及两帮移近量对合理煤柱宽度进行了实证。研究结果得到:理论计算的合理区段煤柱宽度为11.8 m;超前工作面5 m时,12 m煤柱中部存在约3 m的弹性区;煤柱所受垂直应力总体上呈现为马鞍形,随着煤柱宽度的增加,整体所受垂直应力减小,最终确定留设12 m的区段煤柱。现场观测得到顶底板移近量最大值为117 mm,两帮移近量最大值为215 mm,处于可控范围内,进一步证实了12 m宽度煤柱的合理可行。
Excessive width of section coal pillars could cause the loss of mine resources. Therefore, taking Hanjiawa Coal Mine as the research background, based on the influence of roadway and goaf lateral support pressure on coal pillars, this study uses theoretical analysis to obtain the width of the elastic zone in the middle and the width of the limit equilibrium zone on both sides of the coal pillars. FLAC;software was used to simulate the yield failure of 5-meter surrounding rock in the advanced working face and vertical stress distribution curves at different coal pillar widths. In addition, the reasonable coal pillar width was verified based on the roof-to-floor and two-side convergence obtained by field observation. The results showed that, the reasonable section coal pillar width is 11.8 m by the theoretical calculation;at 5 m ahead of the working face, there was an about 3-meter elastic zone in the middle of the 12 m coal pillar;the generally saddle-shaped vertical stress decreased with the increase of the coal pillar width;finally, a 12 m section coal pillar was determined. Field observation showed it was under control with the maximum roof-to-floor convergence 117 mm and the maximum two-side convergence 215 mm, which could further confirm the feasibility of the 12-meter coal pillar.
作者
王治文
白雪文
王常兴
任云峰
刘一扬
WANG Zhiwen;BAI Xuewen;WANG Changxing;REN Yunfeng;LIU Yiyang(Hanjiawa Coal Industry Co.,Ltd.,Shanxi Coal Import and Export Group,Zuoyun037199,China;Institute of Technology Research,Shanxi Coal Import and Export Group,Taiyuan030032,China;Key Laboratory of In-Situ Property-Improving Mining,Taiyuan University of Technology,Taiyuan030024,China)
出处
《山西煤炭》
2021年第4期34-39,共6页
Shanxi Coal
关键词
煤柱宽度
理论计算
屈服破坏
应力分布
coal pillar width
theoretical calculation
yield failure
stress distribution
