摘要
为解决古城煤矿N1302工作面切顶参数与充填墙体参数不合理的问题,基于深孔爆破切顶卸压的原理与技术,通过理论计算确定爆破切顶的高度及角度,利用UDEC数值模拟分析不同切顶高度、切顶角度条件下的巷道围岩变形和应力分布特征。数值模拟结果显示,随着切顶高度的增加,巷道的变形量和充填体的垂直应力先减小后稳定;随着切顶角度的增加,巷道变形量和垂直应力不断增大。综合考虑安全生产和采煤效率等因素,最终确定的切顶优化参数为切顶高度20.5 m,切顶角度20°。现场应用结果显示,切顶后顶底板移近量分别为730 mm和710 mm,两帮移近量分别为450 mm和460 mm,表明通过对顶板进行深孔预裂爆破,可以较好地维护沿空留巷的稳定。研究结果为厚煤层沿空留巷的切顶卸压作业和巷道稳定提供了技术支持。
In order to address the unjustified issues with the top-cutting parameters and filling wall parameters in N1302 operating face of Gucheng Coal Mine,based on the principle and technology of deep-hole blasting and roof cutting pressure relief,the height and angle of blasting roof cutting were determined by theoretical calculation,and the deformation and stress distribution characteristics of roadway surrounding rock under different roof cutting heights and roof cutting angles were analyzed by UDEC numerical simulation.The numerical simulation results show that with the increase of roof cutting height,the deformation of roadway and the vertical stress of filling body decrease first and then become stable.With the increase of roof cutting angle,the deformation and vertical stress of roadway increase continuously.Taking into account factors such as safety production and coal mining efficiency,the final optimized parameters for roof cutting are a top cutting height of 20.5 m and a top cutting angle of 20°.The on-site application results show that the displacement of the roof and floor after roof cutting is 730 mm and 710 mm,respectively,and the displacement of the two sides is 450 mm and 460 mm,respectively.It is indicated that the stability of gob-side entry retaining can be well maintained by deep-hole pre-splitting blasting of roof.The research results can provide a technical support for roof cutting and pressure relief operation and roadway stability of gob-side entry retaining in thick coal seam.
作者
王艳军
张晨
许志军
WANG Yanjun;ZHANG Chen;XUZhijun(Gucheng Coal Mine,Shanxi Lu'an Mining(Group)Co.,Ltd.,Changzhi,Shanxi 046008 China;Coal Industry Taiyuan Design and Research Institute Group Co.,Ltd.,Taiyuan,Shanxi 030001,China;China University of Mining and Technology,Xuzhou,Jiangsu 221008,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第12期103-111,共9页
Mining Research and Development
关键词
厚煤层
深孔爆破
切顶卸压
沿空留巷
围岩控制
Thick coal seam
Deep-hole blasting
Roof cutting pressure relief
Gob-side entry retaining
Surrounding rock control
