巷道围岩-锚杆-锚索协同锚固结构研究

Study on the co-anchoring structure within roadway surrounding rock, bolt and anchor cable

为解决煤矿巷道大变形、常修复等现场问题和难题,通过构建巷道围岩-锚杆-锚索协同锚固结构,采用理论分析、相似模拟和数值模拟等方法,研究锚固结构应力场分布规律与协同特征。结果表明:对锚杆施加预紧力后,在不同方向上的应力分布规律趋于一致,只是应力值大小和衰减情况不同;当锚杆锚固参数合理时,在锚固结构中会产生协同作用和协同效应,其分布范围呈现近椭圆形,且在轴向的分布范围更广;有锚网、钢带的共同作用,锚固结构内所产生的协同效应范围更大;在多条新掘、修复巷道实施该锚固结构后,巷道返修率下降98%以上。巷道围岩-锚杆-锚索协同锚固结构能够显著提高其承载能力和抗变形性能,增强其稳定性、适应性和适用性。

In order to solve the field problems and difficulties such as large deformation and regular repair of coal mine roadway,the anchoring structure synergized within roadway surrounding rock-boltcable was constructed.Theoretical analysis,similarity simulation and numerical simulation were adopted to study the distribution law of stress field and synergic characteristics of the anchoring structure.Results show that the stress distributions in different directions tend to be consistent after the preload is applied to the bolt,but not the stress value and attenuation.When the anchoring parameters of bolt are designed to be reasonable,the synergistic action and effect will be working in the anchoring structure,and the distribution range forms to be nearly elliptical and to be wider in the axial direction.With the joint action of anchor net and steel belt,the range of synergistic effect in the anchoring structure is larger.After such anchorage structure was implemented in several new excavation and repaired roadways,the repair rate of roadways decreased by more than 98%.The synergic anchoring structure of roadway surrounding rockbolt-cable could significantly improve its bearing capacity and deformation resistance,enhance its stability,adaptability and applicability.