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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。
Aiming at the problem that the surrounding rock of rockburst is difficult to be controlled, the roadway with impact and pressure of truss and anchor-bolt combined support is proposed. The theory of truss anchor cable supporting roadway with impact pressure is studied by the method of theoretical analysis and field practice. The mechanics model of roadway supported by anchor cable is established by using mechanics of materials and mechanics of rock mass, and the anti-impact effect of impacting and pressured roadway with common single cable and truss and anchor cable is comparatively studied. The results show that ordinary single cable can not meet the deformation of the surrounding rock and bolt of the roadway, and can be destroyed first. The supporting system of the anchor cable and bolt is broken by each, resulting in the impact of rock burst. Compared with the single cable, The maximum tensile stress of cable anchorage zone decreases Fsinα + F, the maximum shear stress decreases Fsinα, the deformation increases ckcosα, and to a certain extent can achieve the truss anchor cable-anchor synergistic anti-scuffing support. The energy theory analysis shows that the truss anchor cable The support system absorbs D (22 2a / cosa + 2c-2a) energy more than ordinary anchor support system, and the shock magnitude also increases. The field application shows that the truss cable-anchor joint support can effectively prevent the occurrence of rock burst.