明挖隧道高低坑设计计算方案研究

Study on Design and Calculation Schemes for Excavation of High and Low Pits of Tunnel

结合上海市诸光路通道工程隧道主线与下层匝道并行形成高低坑的工程实例,对基坑支护不同的计算方案进行比选研究,采用了一种合理的高低坑计算方案,同时在满足了基坑各项稳定性的指标要求的前提下,对比选取了高低坑工况下基坑所需的围护桩长,对今后类似工程具有一定参考价值。

Combined with the engineering example of the high and low pits formed by the parallel of mainline tunnel and the lower ramp in Shanghai Zhuguang Road Tunnel Project, the article compares, selects and studies the different calculation schemes of pit support. A suitable calculation scheme of high and low pits is used. On the premise of meeting the requirements of stability indexes of the foundation pit, the article compares and selects the length of retaining piles required for the foundation pit under the constructing condition of high and low pits, which can be referred for the similar projects.