冲击地压巷道桁架锚索支护原理与实践  

The supporting principle of truss cable in the rockburst roadway and its application

作　　者：姚精明[1,2] 王路[1,2] 闫永业[3] 何富连[4] 蹇伦 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学资源及环境科学学院,重庆400044 [3]河南科技学院机电学院,河南新乡453003 [4]中国矿业大学(北京)资源与安全工程学院,北京100083 [5]万海隆矿业集团股份有限公司甘家沟煤矿,贵州水城553600

出　　处：《采矿与安全工程学报》2017年第3期535-541,共7页Journal of Mining & Safety Engineering

基　　金：中央高校基本科研业务费专项资金项目(CDJZR13240025)

摘　　要：针对冲击地压巷道围岩难以控制的问题,提出采用桁架锚索-锚杆联合支护冲击地压巷道。采用理论分析、现场实践相结合的方法,研究桁架锚索支护冲击地压巷道的原理。运用材料力学、岩体力学理论,建立锚索支护巷道的力学模型,对比研究普通单体锚索和桁架锚索支护冲击地压巷道抗冲效果。研究表明:普通单体锚索难以适应巷道围岩和锚杆的变形而先行破坏,锚索-锚杆支护体系被各个击破,从而导致冲击地压发生;相对于单体锚索,桁架锚索锚固区围岩最大拉应力降低Fsinα+F,最大剪应力降低Fsinα,变形量增加ckcosα,并一定程度上能够实现桁架锚索-锚杆协同防冲支护;能量理论分析表明,桁架锚索支护系统比普通锚索支护系统要多吸收D(22 2a/cosa+2c-2a)能量,抗冲震级也加大。现场应用表明,桁架锚索-锚杆联合支护能够有效地防止巷道冲击地压的发生。In view of the problem of controlling surrounding rocks in the rockburst roadway, the com- bined support of truss cable and bolt was put forward. The principle of truss cable supporting in the rockburst roadway is studied through theoretical analysis and in-situ practice, the mechanical model of cable supporting was set up based on the theory of material mechanics and rock mechanics, and anti-rockburst effect between supporting with single anchor cable and supporting with truss cable was studied comparatively. The result has shown that not adapted to the deformation of surrounding rocks of roadway and bolts, the common single cable always fails first, and thus the supporting system is dividedand conquered, which leads to rockburst; compared against the single anchor cable supporting, the maximum tensile stress of surrounding rocks supported by truss cable reduces by Fsin a＋F, the maxi- mum shear stress reduces by Fcos a, and the maximum deformation increased by ckcos a, and to a cer- tain extent the coordinated supporting against rockburst can be realized with the truss cable and bolt system. Energy theory analysis has shown that the truss cable supporting system absorbs D（2a/cos a＋ 2c-2a） more energy than the common single cable supporting system, and its anti-rockburst ability is stronger. The field application has shown that combined supporting of truss cable and bolt can effec- tively prevent and control rockburst.

关 键 词：冲击地压 桁架锚索 支护原理 现场应用 

分 类 号：TD323[矿业工程—矿井建设]