散体材料复合地基承载力分析方法研究

Study on the Calculation of Bearing Capacity of Composite Foundation on Discrete Material Pile

目的研究长短桩复合地基这一新型的地基处理技术,解决其承载力计算方法问题.方法首先从试验出发,全面分析散体材料桩复合地基的承载机理.在此基础上,引进圆孔扩张理论,充分考虑散体材料桩与桩土间相互作用.结果导出了桩体与土体承载过程中的应力应变计算公式,并针对以往承载力计算方法主观参数众多难以确定以及未能考虑布桩方式影响的缺陷,提出了一套散体材料桩复合地基面积比承载力计算方法.结论通过工程算例,验证了文中计算方法的可行性.

Based on the result of model test, the work mechanics of composite foundation on discrete material pile is studied deeply. Then, in order to simulate the mutual action between pile and soil, the theory of round-hole expansion is used to calculate the stress-strain of pile and soil in loading process, based on which, according to defect of the normal calculations which have too many subjective parameters and ignore the influence of pile arrangement, a new calculation of bearing capacity of composite foundation on discrete material pile has been derived. Finally, an engineering example is discussed to verify the method.