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在欠固结的软基中开挖深基坑的技术难度和风险很大。以深圳机场扩建工程轨道交通枢纽基坑工程为背景,分析了有深厚淤泥层的填海地区大型基坑的难点及相应对策,介绍了该基坑咬合桩+锚碇、锚索的支护方案;在设计中采用淤泥层排水固结强度增长规律取用强度指标,结合锚碇、锚索的受力特征对围护结构做了有限元计算分析;基坑监测结果表明计算结果与实际相符,验证了支护设计安全、合理。
It is very difficult and risky to excavate deep foundation pit in under consolidated soft foundation. Taking the excavation project of Shenzhen Airport Extension Project as a rail transit hub as the background, the difficulties and countermeasures of large-scale foundation pit with deep silt layer in reclamation area are analyzed. The supporting plan of anchoring billet and anchorage pile is introduced In the design, taking the strength index of the law of growth and consolidation of the drainage layer of muddy mud as an index, combining the mechanical characteristics of anchorage and anchor cable, the finite element analysis of the retaining structure was done. The results of foundation pit monitoring showed that the calculated results were in accordance with the actual conditions, Verify the support design is safe and reasonable.