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为探究预应力锚杆对岩体板裂化破坏的控制机制,首先进行了岩体板裂化破坏的室内物理模型试验,并运用FLAC数值模拟技术,模拟了平面应变状态下板裂化破坏的形成过程;在此基础上,通过3种不同的预应力锚杆施加方案,进行预应力锚杆对岩体板裂化破坏控制机制的数值试验。研究结果表明:预应力锚杆的作用削弱了裂隙尖端应力集中现象,有效地抑制了岩体内裂隙的扩展与贯通、板裂化破坏的形成;作用在板裂区边界的预应力锚杆,不仅能够抑制板裂化破坏的形成,而且能在一定程度上控制板裂化破坏的范围;作用在板裂破坏区内的预应力锚杆,可有效限制板裂岩体向临空面的位移,体现出提高板裂岩体整体变形刚度的作用。研究结果对认识深埋隧洞围岩板裂化破坏的形成机制、板裂化破坏的合理支护控制以及岩爆防治具有重要指导价值。
In order to explore the control mechanism of prestressed anchor on the cracking and failure of rock mass plate, the physical model test of rock mass plate cracking and failure was first carried out. The formation process of plate cracking under plane strain was simulated by FLAC numerical simulation. On this basis, three different prestressed anchor application schemes are used to carry out numerical tests on the control mechanism of prestressed anchor on the cracking and failure of rock mass. The results show that the effect of prestressed anchor weakens the stress concentration at the crack tip and effectively suppresses the propagation of crack propagation and perforation and plate cracking in the rock mass. The prestressed anchor acting on the boundary of the crack zone not only Which can restrain the formation of plate cracking and destroy the range of plate cracking. The prestressed anchor that acts on the plate crack failure area can effectively limit the displacement of the plate crack rock mass to the surface, Improve the overall deformation of slab rock stiffness effect. The results of the study have important guiding significance in understanding the formation mechanism of the cracking of surrounding rockmass in deep tunnels, the reasonable support control of plate cracking and the prevention and control of rockburst.