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以实际水下隧道为工程背景,建立数值模型,分析水下并行隧道后行洞施工对先行洞的影响.结果表明:后行洞施工主要影响距离该断面位置前后1.5倍洞径;后行洞施工后,围岩沉降分布形态发生变化,在左右拱顶较大,在两洞之间及两侧较小,即出现了“驼峰”;对于最大主应力,后行洞施工对靠近侧的右边墙影响较大;随着后行洞的施工,渗流影响范围逐渐向后行洞侧扩展,隧道周边渗流量的大小呈现拱顶和仰拱处的大于边墙的,而后行洞和先行洞之间的边墙渗流量大于外侧边墙的渗流量.
Taking the actual underwater tunnel as the engineering background, the numerical model was established to analyze the influence of the construction of the backholes in the submerged parallel tunnels on the advance tunnels. The results show that the construction of the backholes mainly affects the distance of 1.5 times the tunnel distance before and after the section; After construction, the distribution of surrounding rock subsidence changes, with larger vaults on the left and right, smaller between the two holes and on both sides, ie, “hump” appears; for the maximum principal stress, The influence of the right side wall will be greatly affected. With the construction of the backholes, the influence scope of seepage gradually expands to the side of the backward tunnel, the seepage volume of the perimeter of the tunnel is larger than the side wall at the vault and uprights, The seepage volume of the side wall between the holes is larger than that of the outer side wall.