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我国现阶段四车道大断面公路隧道建设既无成熟的经验可参考,又无规范可参照,特别是大断面隧道洞口段临时支撑的拆除尤为重要,稍有不慎,极易引起坍塌。以龙头山双洞八车道高速公路隧道为依托,借助数值计算方法,重点分析了隧道洞口段临时钢支撑拆除的不同长度对围岩、隧道结构的影响,并结合现场施工情况,提出了大断面隧道洞口段临时支撑适宜的拆除长度,为类似特大断面公路隧道洞口段的施工提供参考。
At present, there is neither mature experience nor reference to the construction of four-lane large-section highway tunnel in our country. In particular, the demolition of temporary support for the tunnel section of large cross-section tunnels is especially important. It is easy to cause collapse. Based on the tunnel of Longtoushan double-lane eight-lane expressway, the influences of different lengths of temporary steel support dismantling on the surrounding rock and tunnel structure are analyzed emphatically based on the numerical calculation method. Combined with the construction conditions of the site, a large section The appropriate removal length of temporary support for the tunnel entrance section provides a reference for the construction of the tunnel entrance section similar to the oversize highway tunnel.