基于正交试验的采空区下单轨吊巷道支护参数优化研究

Study on optimization of support parameters of monorail crane roadway under goaf based on orthogonal test

潘二矿18124工作面顶板条件复杂,岩层强度较低,易出现顶板垮落等安全事故,给单轨吊大件运输留下安全隐患。为解决此类安全问题,以潘二矿18124工作面单轨吊运输巷道为工程背景,在单轨吊轨道梁受力分析的基础上,采用正交试验与极差分析法系统研究了采空区下复杂顶板条件影响巷道变形的敏感性因素,对比探究了不同参数下锚杆锚索协同支护作用。研究结果表明,影响巷道顶底板及两帮变形的敏感性因素排序:锚杆间排距A>锚杆长度B>锚杆直径C(锚索间排距D>锚索长度E>锚索直径F);确定了实验条件下的最优支护方案,即锚杆间排距800 mm×900 mm,锚杆长度2.5 m,锚杆直径22 mm,锚索间排距1000 mm×1800 mm,锚索长度9.3 m,锚索直径22 mm。研究结果可为单轨吊在类似地质条件的工作面安装与使用提供理论依据。

The roof conditions of 18124 working face in Pan’er Coal Mine are complex,the strength of rock strata is low,and safety accidents such as roof collapse are easy to occur,which leaves potential safety hazards for large-scale transportation of monorail crane.In order to solve such safety problems,taking the monorail crane transportation roadway of 18124 working face in Pan’er Coal Mine as the engineering background,based on the stress analysis of monorail crane track beam,the orthogonal test and range analysis method are used to systematically study the sensitivity factors of complex roof conditions affecting roadway deformation under goaf,and the synergistic support effect of anchor bolts and cables under different parameters is compared and explored.The results show that the sensitivity factors affecting the deformation of the roof and floor of roadway and the two sides are ranked as follows:the row spacing between anchor bolts A>the length of anchor bolt B>the diameter of anchor bolt C(the row spacing between anchor cables D>the length of anchor cable E>the diameter of anchor cable F).The optimal support scheme under the experimental conditions is determined,that is,the row spacing between anchor bolts is 800 mm×900 mm,the length of anchor bolt is 2.5 m,the diameter of anchor bolt is 22 mm,the row spacing between anchor cables is 1000 mm×1800 mm,the length of anchor cable is 9.3 m,and the diameter of anchor cable is 22 mm.The research results can provide theoretical basis for the installation and use of monorail crane in working face with similar geological conditions.