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介绍了武广铁路客运专线路基典型断面变形、应力监测方案,对CFG桩复合地基中桩身压缩量、不同深度范围内桩间土压缩量的监测结果进行整理分析,探讨了路基填筑、停载、超载预压、超载卸除等施工过程中CFG桩复合地基的变形发展规律。现场实测结果表明:在施工过程中,CFG桩复合地基中的桩、土变形并不协调,其变形差随着复合地基中应力不断调整而逐步减小;基于复合地基压缩变形的93.4%发生在CFG桩加固深度内,准确计算加固区沉降是提高复合地基沉降计算精度的关键。
This paper introduces the typical section deformation and stress monitoring program of the subgrade of Wuhan-Guangzhou passenger dedicated railway line. The monitoring results of the amount of pile compression in the CFG pile composite foundation and the amount of soil compression between piles in different depths are analyzed and analyzed. Load, overloading preloading, overloading and other construction process of CFG pile composite foundation deformation and development. The field test results show that during the construction process, the deformation of pile and soil in CFG pile composite foundation is not coordinated, and the deformation difference decreases with the continuous adjustment of stress in the composite foundation. 93.4% of the compressive deformation based on composite foundation occurs in Within the CFG pile reinforcement depth, the accurate calculation of the settlement of the reinforcement zone is the key to improve the calculation accuracy of the settlement of the composite foundation.