CFG桩复合地基极限承载力计算模型及其验证

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New Model and Its Validation for Calculating Limiting Bearing Capacity of CFG Pile Composite Foundation

1. China Jingye Engineering Corporation Limited, Beijing 100088;
2. China Ordinance Industry Institute of Geotechnical Sruvey and Design, Beijing 100053;
3. Logistics Department Insistutc of Building Design Research, Beijing 100036 China

摘要: CFG桩因具有良好的经济性和适用性,工程中得到了越来越广泛地应用,传统的分析方法主要通过桩土承载力迭加获取,与实际施工监测结果误差比较大。在分析了CFG桩复合地基的竖向承载力特性基础上,依据CFG桩复合地基的等沉面上下部分的不同特征,提出了CFG桩复合地基的"双剪切破坏模型":等沉面以上部分看作太沙基模型的桩体的向上剪切破坏,等层面以下部分看作迈耶霍夫模型的桩体向下的剪切破坏,推导了极限承载力的有关计算模型,讨论了该模型适用条件,并结合工程实例,验证了所提模型的正确性,对CFG桩复合地基工程有一定的指导意义。
- 等沉面 /
- 双剪切破坏模型 /
- 承载力
Abstract: This article analyses vertical bearing character of CFG pile composite foundation, according to the particularity of equal settlement surface, two shear failure model about CFG pile composite foundation is brought forward, the part above equal settlement surface is considered pile's uprising shear failure of Terzaghi's mode, the part below equal settlement surface is considered pile's uprising shear failure of Meyerhof's model, through assumption, the formula of limiting bearing capacity is educed and engineering practice.
- equal settlement surface /
- two shear failure model /
- bearing capacity