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在运营地铁高架桥下方承载地层中实施深基坑开挖是一项高难度的工程,为确保上方地铁的正常运营,须严格控制基坑开挖对紧邻桥墩的位移影响,这就需要明确其影响规律,并预先制定相应的保护控制措施。以上海12号线龙漕路车站基坑工程为依托,结合数值模拟和施工监测,分析了基坑开挖过程中紧邻高架桥墩较为“异常”的位移响应—紧邻桥墩发生了一定的上抬,明确了深基坑开挖引起紧邻长短桩的位移规律,提出了制定控制保护措施时的原则和方法。
It is a very difficult project to carry out deep foundation pit excavation in the bearing stratum beneath the subway viaduct. To ensure the normal operation of the subway above, the influence of excavation on the displacement of the adjacent abutment must be strictly controlled, which needs to be clearly defined Laws, and pre-formulated the appropriate protection and control measures. Based on the foundation pit project of Longcao Road Station in Shanghai Line 12, combined with numerical simulation and construction monitoring, the displacement response of the adjacent abutment viaduct adjacent to the viaduct during excavation is analyzed. Lift, clear the deep foundation pit excavation caused by the displacement of the short and long piles, put forward the principles and methods for the development of control and protection measures.