应用离散单元法软件UDEC对压缩波作用下的节理岩体中不同节理性质、不同埋置深度条件下隧道围岩的稳定进行数值模拟分析.监测隧道埋深由5 m增加到45 m,分析节理不同刚度、间距、倾角时隧道洞顶的峰值质点速度(PPV).结果表明:随着隧道埋深增加,隧道洞周峰值质点速度降低,隧道稳定性增强.随着节理刚度的提高,隧道顶部峰值质点速度上升;随着节理间距增加,隧道顶部峰值质点速度下降;随着节理倾角增大,隧道顶部峰值质点速度有上升的趋势.总体而言,埋深增加会对隧道稳定有明显提升效果,并且在节理岩体中节理刚度低、间距大、倾角小的围岩条件更安全.%A numerical simulation analysis applies to the stability of tunnel-surrounding rock with different joint properties and buried depths under compressive wave by using UDEC software (discrete element method). The peak particle velocity (PPV) at top of the tunnel changes with different stiffness, spacing and inclination of the joints while the tunnel depth increases from 5m to 45m. The results show as follows. The peak particle velocity around the tunnel decreases and the tunnel becomes more stabilized with the increment of the tunnel buried depth. The peak particle velocity at top of the tunnel increases with the increment of joint stiffness. The peak particle velocity at top of the tunnel decreases with the increment of joint spacing. The peak velocity at top of the tunnel tends to increase with the increase of joint inclination. In general, the increase of buried depth may effectively stabilize the tunnel, which is more applicable for the surrounding rock with low stiffness, large spacing and small inclination of joint.
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