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对于软岩大跨度小净距隧道,由于软岩工程性质差,且隧道施工工序较多,隧道围岩稳定性受施工扰动的影响更为显著,隧道净距对围岩稳定性的影响更为直接;分析软岩大跨度小净距隧道的净距对隧道施工力学行为的影响,确定最小净距有着重要的现实意义。以二广高速公路西岸大跨度小净距隧道为实例,以隧道Ⅴ级围岩为研究对象,在模型概化、参数综合选取的基础上,通过ANSYS数值模拟分析了隧道不同净距对隧道围岩应力、变形及塑性区分布的影响,并确定此类隧道的最小净距不宜小于0.45倍的单洞跨度,该结论对软弱围岩大跨度小净距隧道的净距选择有一定的指导意义。
For the small soft-shelled long-span tunnel with small span, due to poor engineering properties of soft rock and more tunnel construction procedures, the stability of surrounding rock of tunnel is more affected by construction disturbance, and the effect of tunnel clearance on the stability of surrounding rock is more Directly; It is of great practical significance to analyze the influence of the clear distance of the large-span and small-span soft-rock tunnel on the tunnel construction mechanics behavior and determine the minimum clearance. Taking the large-span small-span tunnel in the west coast of Erguang Expressway as an example, taking Grade V surrounding rock of tunnel as the research object, based on the generalization of the model and the comprehensive selection of the parameters, numerical simulation of the tunnel clearance Rock stress, deformation and distribution of plastic zone, and the minimum spacing of such tunnel should not be less than 0.45 times the single-hole span, the conclusions of the weak span of large-span small clear-distance tunnels clear choice of some guidance .