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在夯实水泥土桩复合地基设计中,桩土应力比n、桩体应力集中系数μp、桩间土应力减小系数μs是非常重要的设计参数。本研究基于不同桩长的单桩及四桩复合地基,不同面积置换率的九桩复合地基现场载荷试验,通过测试元件量测复合地基的桩顶反力、地基土反力。分析了夯实水泥土桩复合地基的n、μs、μp的变化规律,并给出承载力特征值时n、μs、μp的取值范围及其影响因素。
In the design of rammed cement-soil pile composite foundation, the pile-soil stress ratio n, the pile stress concentration coefficient μp and the soil stress reduction coefficient μs between piles are very important design parameters. The present study is based on the field load test of nine pile composite foundation with different length of single pile and four composite foundations with different area replacement rates. The test element is used to measure the top reaction force of foundation and the reaction force of foundation soil. The variation law of n, μs and μp of rammed cement-soil pile composite foundation is analyzed. The range of n, μs, μp and its influencing factors are given when the bearing capacity characteristic value is given.