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基于数值模拟方法,对隧道在逆断层下盘开挖时,隧道与断层之间的距离对隧道围岩的影响进行了研究。研究发现,隧道的开挖导致了断层的活化;随着隧道边界与断层边界之间的距离L变大,围岩的最大位移和最大增量位移逐渐由隧道的向断层一侧转向隧道的顶部,且随着L的增大,围岩最大位移和最大增量位移非线性减小,最后趋于稳定值;当L较小时,隧道两侧应力不均衡,随着L的增大,隧道两侧的应力逐渐变得均衡;断层对变形和应力有屏蔽作用;隧道稳定安全系数开始时随L的增大而增大,但当L增加到一定值后安全系数就不再增大。结果表明,随着隧道离断层距离的不同,断层对隧道围岩的影响也不同;本文的研究结论可为隧道的布置和施工措施提供重要依据。
Based on the numerical simulation method, the influence of the distance between the tunnel and the fault on the surrounding rock of the tunnel when the tunnel is under excavation of the reverse fault is studied. It is found that the excavation of the tunnel leads to the activation of the fault. As the distance L between the tunnel boundary and the fault boundary becomes larger, the maximum displacement and the maximum incremental displacement of the surrounding rock gradually shift from the tunnel to the top of the tunnel , And with the increase of L, the maximum displacements and the maximum displacements of the surrounding rock decrease non-linearly and finally reach a steady value. When L is small, the stresses on both sides of the tunnel are not balanced. As L increases, The stress on the side gradually becomes balanced; the fault shields the deformation and stress; the safety factor of tunnel increases with the increase of L at the beginning, but the safety factor will not increase when L increases to a certain value. The results show that the influence of the fault on the surrounding rock of the tunnel is also different with the distance from the tunnel to the fault. The conclusion of this paper can provide an important basis for the tunnel layout and construction measures.