摘要
为弱化宏岩煤矿10106工作面顺槽顶板,降低矿压显现程度,针对性采取了切顶爆破技术。根据材料力学理论,将顶板悬臂梁挠度模型划分为弯曲作用部分与剪切作用部分,建立了切顶前后顶板悬臂梁结构力学模型的挠度方程,分析了悬臂梁长度与巷旁侧位移的关系,通过数值模拟分析了不同切顶高度和切顶角度条件下的覆岩应力变化特征,确定切顶高度15 m和切顶角度20°为最佳参数配置,在10106工作面顺槽开展工程应用与监测分析。钻孔窥视与围岩变形量监测表明:裂缝多以沿钻孔排列方向的对称裂缝形式出现,裂缝形成率超过75%,裂缝扩展效果良好,巷道围岩位移量存在初始变形阶段、快速变形阶段、变形稳定阶段3阶段变化趋势,巷道围岩变形量在滞后工作面60 m后趋于稳定,有效地控制了巷道围岩的变形。
In order to weaken the crossheading roof of the 10106 working face in Hongyan Coal Mine and reduce the degree of mine pressure manifestation,targeted roof cutting blasting technology is adopted.According to the theory of material mechanics,the deflection model of the roof cantilever beam is divided into bending action part and shear action part.The deflection equation of the mechanical model of the roof cantilever beam structure before and after roof cutting is established.The relationship between the length of the cantilever beam and the lateral displacement of the roadway side is analyzed.The stress change characteristics of the overlying rock under different cutting heights and angles are analyzed through numerical simulation.The optimal parameter configuration is determined to be a cutting height of 15 m and a cutting angle of 20°.Engineering application and monitoring analysis are carried out in the 10106 working face crossheading.The drilling peeking and monitoring of surrounding rock deformation amount show that cracks mostly appear in the form of symmetrical cracks along the arrangement direction of drilling,with a crack formation rate of over 75%.The crack propagation effect is good,and the displacement amount of the roadway surrounding rock has a three-stage change trend of initial deformation stage,rapid deformation stage,and stable deformation stage.The deformation amount of the roadway surrounding rock tends to stabilize after lagging behind the working face by 60 m,effectively controlling the deformation of the roadway surrounding rock.
作者
王剑辉
Wang Jianhui(Shanxi Liliu Coking Coal Group Hongyan Coal Mine,Shanxi Lüliang 033000)
出处
《山东煤炭科技》
2024年第5期25-30,共6页
Shandong Coal Science and Technology
关键词
预裂爆破
切顶卸压
悬臂梁
数值模拟
presplitting blasting
roof cutting pressure relief
cantilever beam
numerical simulation
