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目前,在道路复合地基设计中普遍采用建筑规范的计算公式,由于道路地基直接承受上部路堤和车辆活载,为柔性基础,而建筑基础为刚性基础,因此直接套用建筑规范计算公式会导致计算值与实测值差异较大。在柔性基础下,CFG桩受力存在负摩阻区,本文依据其受力特点对建筑规范中的单桩承载力计算公式进行改进,并将改进公式应用在足尺试验—京津二通道工程中。实践应用表明,改进公式计算结果与监测值一致,工后沉降控制较好。因此,改进公式能够很好地反应柔性基础下CFG桩的工作特点,对完善道路复合地基设计、保证工程质量具有十分重要的意义。
At present, the formula of building code is widely adopted in the design of road complex foundation. Because the road foundation is directly supported by the upper embankment and the vehicle live load, it is a flexible foundation and the building foundation is a rigid foundation. Therefore, directly applying the building code formula will result in the calculation value Difference with the measured value. Under the flexible foundation, there is a negative friction zone for the stress of CFG pile. According to the characteristics of its stress, this paper improves the calculation formula of single pile bearing capacity in building code, and applies the improved formula to full scale test - in. Practical application shows that the improved formula calculation results are consistent with the monitoring values, post-construction settlement control is better. Therefore, the improved formula can well reflect the working characteristics of CFG piles under flexible foundation, which is of great significance to improve the design of road composite foundation and ensure the project quality.