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基于剪切位移法,引入Mylonakis&Gazetas桩-土相互作用及Winkler地基模型,导出了复合地基中桩-桩、桩-土及土-土相互作用柔度系数;在此基础上,提出了一种综合考虑桩-土-垫层共同作用的复合地基分析方法,并利用Matlab软件编制了相应的计算程序。为了验证该方法的可行性,对楔形桩和圆柱形桩复合地基进行了模型对比试验,并利用该方法对两个模型试验进行了计算分析,试验及理论结果均表明,桩顶平面处的桩间土反力保持着类似天然地基的马鞍形分布,圆柱形桩复合地基的承载力明显低于楔形桩复合地基的承载力,同时,圆柱形桩复合地基的桩土平均应力比明显高于楔形桩复合地基的桩土平均应力比,楔形桩对缓解复合地基中桩顶应力集中,充分利用天然地基的承载能力具有良好的调节作用。
Based on the shear displacement method, the pile-soil interaction and Winkler foundation model of Mylonakis & Gazetas are introduced to derive the flexibility coefficient of pile-pile, pile-soil and soil-soil interaction in composite foundation. On this basis, Considering the pile-soil-cushion interaction of composite foundation analysis method, and the use of Matlab software developed corresponding calculation program. In order to verify the feasibility of the method, the model comparison test of wedge-shaped pile and cylindrical pile composite foundation is carried out. The two model tests are calculated and analyzed by using the method. The test and theoretical results show that the pile The soil-soil reaction maintains a saddle-shaped distribution similar to that of a natural foundation. The bearing capacity of the cylindrical pile composite foundation is obviously lower than that of the wedge-shaped pile composite foundation. Meanwhile, the average pile-soil stress ratio of the cylindrical pile composite foundation is obviously higher than that of the wedge Pile-composite foundation pile average stress ratio, wedge-shaped piles to ease the stress in the composite foundation pile stress, take full advantage of the natural foundation bearing capacity has a good regulatory role.