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中岩柱单边落地法是利用中岩柱将大跨度隧道分解为小断面隧道,以降低隧道开挖的风险。以某大断面公路隧道为背景,通过建立三维数值模型,主要分析了围岩加固、中岩柱材料、中岩柱宽度、中岩柱高度等参数变化对隧道变形和稳定性的影响。由计算结果可知,围岩加固、采用钢筋混凝土中岩柱、增加中岩柱宽度、降低中岩柱高度具有正面影响。最后,通过实际工程的应用,验证了数值计算结果的正确性,同时也证实了该方法具有一定的推广价值。
In the rock pillar unilateral landing method is the use of rock columns will be long-span tunnel broken down into small sections of the tunnel, in order to reduce the risk of tunneling. Taking a large section of highway tunnel as a background, through the establishment of three-dimensional numerical model, mainly analyzes the influence of the surrounding rock reinforcement, the material of the middle rock pillar, the width of the middle rock pillar, the height of the middle rock pillar and other parameters on the deformation and stability of the tunnel. From the calculation results, we can see that the surrounding rock reinforcement, the use of reinforced concrete columns, increasing the width of the middle column, reducing the height of the middle column has a positive impact. Finally, the correctness of the numerical results is verified through the application of the practical engineering. At the same time, it also proves that the method has certain promotion value.