夯实水泥土桩复合地基桩土应力比的研究  

Study on Pile-soil Stress Ratio of Composite Foundation with Rammed Soil-cement Piles

作　　者：郭忠贤[1] 杨志红 王占雷 

机构地区：[1]石家庄铁道学院土木分院 [2]河北省建筑科学研究院,石家庄050021

出　　处：《工程勘察》2006年第6期10-13,共4页Geotechnical Investigation & Surveying

摘　　要：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。The pile-soil stress ratio n, the coefficient of stress concentration of pile body and the coefficient of stress reduction of the soil between piles are the key parameters in the design of the composition foundation with rammed soil-cement piles. Based on the in-situ loading tests of the composite foundation for single pile and four piles with different length and the composite foundation for the nine piles with different displacement ratio, the reaction of pile tip and the soil contact pressure between piles are measured by the installed special gauges. The variation laws of the parameters n, μ, and μ , for the foundation are analyzed, and the ranges of the parameters n, μ, and μ ,for beating capacity are suggested.

关 键 词：夯实水泥土桩复合地基 桩土应力比 桩间土应力减小系数 桩体应力集中系数 

分 类 号：TU472.1[建筑科学—结构工程]