摘要
针对厚顶煤矩形断面巷道顶板两侧肩角锚杆易剪切破断、顶煤易离层破碎等支护难题,以唐家会矿61201综放工作面运输巷为工程背景,通过数值模拟对矩形和直墙平顶肩角微拱形厚顶煤巷道应力分布特征进行了对比分析。结果显示:直墙平顶肩角微拱形厚顶煤巷道顶板两侧肩角无应力集中、顶帮煤体松动范围相对于矩形厚顶煤巷道均有所减小,尤其顶煤松动范围减小明显,说明直墙平顶肩角微拱形断面有利于厚顶煤巷道围岩稳定性控制。在此基础上,提出了相应的巷道围岩控制对策,并进行了支护参数优化,经过现场应用,不仅顶板两侧肩角未发生锚杆剪断现象,而且掘进期间顶板下沉量达到15 mm时就趋于稳定,回采期间顶底板累计移近量仅220 mm,两帮移近量仅150 mm,支护效果显著。
In view of the supporting problems such as the bolt at the shoulder angle on both sides of rectangular section roadway roof with thick top coal was easy to shear and break,and the top coal was easy to separate and break,the transportation roadway of the 61201 fully-mechanized caving face in Tangjiahui Mine was taken as the engineering background,the stress distribution characteristics of the thick top coal roadway with micro arch at the shoulder angle of the rectangular and straight wall flat top were compared and analyzed by numerical simulation.The results showed that there was no stress concentration in the shoulder angles of both sides of the roof of the micro arch thick top coal roadway with straight wall and flat top,and the range of the top coal body loosening was smaller than that of the rectangular thick top coal roadway,especially the range of the top coal loosening was obviously reduced,which shows that the micro arch section of the straight wall and flat top shoulder was conducive to the stability control of the surrounding rock of the thick top coal roadway.On this basis,the corresponding surrounding rock control measures were put forward and the support parameters of the roadway were optimized.The field application shows that after the optimization of the scheme,not only the anchor bolt cutting phenomenon does not occur at the shoulder angles of both sides of the roof,but also the roof subsidence tends to be stable when it reaches 15 mm during the excavation period.During the mining period,the total displacement of the roof and floor was only 220 mm,and the displacement of the two sides was only 150 mm,so the support effect was significant.
作者
李晓斌
杨张杰
翟恩发
刘念全
王庆牛
Li Xiaobin;Yang Zhangjie;Zhai Enfa;Liu Nianquan;Wang Qingniu(Tangjiahui Mine,Huaxing Energy Co.,Ltd.,Ordos 017006,China;Anhui Province Coal Science Research Institute,Hefei 230001,China)
出处
《能源与环保》
2021年第4期243-248,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
安徽省重点研究与开发计划项目(1704a0802130)。
关键词
厚顶煤
断面形状
微拱形
围岩稳定
应力分布
thick coal top
section shape
micro arch
stability of surrounding rock
stress distribution
