摘要
针对厚煤层切顶护巷围岩矿压显现较为剧烈的工程问题,采用理论分析、FLAC3D数值模拟和巷道围岩变形现场试验,对韩城矿区桑树坪二号井厚煤层切顶卸压护巷关键参数进行探究,得出:切顶导致基本顶原有应力传递路径发生改变,使得压力转移到采空区,从而减轻采空区的侧向实体围岩应力,围岩应力越发均匀缓和;通过理论分析和数值模拟的方法,对切顶高度为10.5、12.5、14.5、16.5 m及切顶角度为55°、65°、75°、85°的巷道围岩应力及其分布进行了分析,结果表明:最佳切顶高度14.5 m和切顶角度75°不仅能有效切断采空区顶板岩层与巷道之间的应力传递路径,迫使应力集中区域向实体煤深处转移,还能使得顶板岩层在工作面回采后及时垮落并充填至采空区,进而改善巷道围岩应力环境;通过现场试验对3308工作面二号回风平巷进行了表面位移观测,巷道围岩变形量小,护巷效果良好。
In view of the engineering problem that rock pressure of thick coal seam cutting and protecting roadway is more severe,the key parameters of rock pressure relieving and protecting roadway of thick coal seam in Sangshuping No.2 well in Hancheng mining area are explored by theoretical analysis,FLAC 3D numerical simulation and field test of roadway surrounding rock deformation.The results are as follows:The cutting of the top causes the change of the original stress transfer path of the basic top,which makes the pressure transfer to the goaf,thus reducing the lateral solid surrounding rock stress of the goaf,and the surrounding rock stress becomes more uniform.By means of theoretical analysis and numerical simulation,the surrounding rock stress and its distribution of roadway with cutting height of 10.5,12.5,14.5,16.5 m and cutting Angle of 55°,65°,75°and 85°are analyzed.The results show that:The optimal cutting height of 14.5 m and the cutting angle of 75°can not only effectively cut off the stress transfer path between the goaf roof strata and the roadway,forcing the stress concentration area to transfer to the deep coal,but also make the roof strata collapse and fill to the goaf in time after the mining face,thus improving the stress environment of the roadway surrounding rock.The surface displacement of No.2 return air roadway at 3308 working face was observed through field tests.The surrounding rock deformation of the roadway was small and the effect of roadway protection was good.
作者
王春斌
李军岐
邸广强
冯磊
陈龙
WANG Chunbin;LI Junqi;DI Guangqiang;FENG Lei;CHEN Long(Shaanxi Coal Hancheng Mining Co.,Ltd.,Hancheng 715400,China;School of Energy,Xi′an University of Science and Technology,Xi′an 710054,China)
出处
《煤炭技术》
CAS
2024年第3期75-80,共6页
Coal Technology
关键词
动压巷道
数值模拟
切顶卸压
关键参数
dynamic pressure roadway
numerical simulation
roof cutting and pressure relief
key parameters
