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针对深圳葵坝路偏压隧道出口段下穿葵坝高速立交桥进行了二维仿真分析,通过对台阶法,预留核心土,CD法,CRD法4种工法条件下围岩-结构及既有构筑物的力学行为特征进行分析,探明了各工法开挖过程中围岩应力和位移情况以及对既有桥梁的影响。研究表明:隧道开挖,将导致桥墩出现不均匀沉降,使桥墩和桥面产生附加应力,其中对6#墩影响最为明显;各种工法中,CRD法为最优工法,台阶法开挖最为不利;预加固桥墩和围岩能有效减小沉降和附加应力,确保桥梁安全。
According to the two-dimensional simulation analysis of the Kuai-Pa Expressway underpass at the outlet section of the bi-pressure tunnel in Kui-Ba Road, Shenzhen, by the step method, reserving the core soil, CD method and CRD method, The mechanical behaviors of the structures are analyzed, and the stress and displacement of the surrounding rock and the influence on the existing bridges during the excavation of each working method are proved. The results show that tunnel excavation will lead to uneven settlement of pier and additional stress on bridge piers and decks, of which the impact on Pier 6 is the most obvious. Among all the methods, the CRD method is the best method and the step method is the most Unfavorable; Pre-reinforced piers and surrounding rock can effectively reduce the settlement and additional stress to ensure the safety of the bridge.