夯实水泥土楔形桩复合地基中桩的合理楔角范围研究  

Study of the rational wedge angle range in a composite foundation with rammed soil-cement tapered piles

作　　者：刘杰[1] 何杰[1] 闵长青[1] 

机构地区：[1]湖南工业大学,湖南株洲412008

出　　处：《土木工程学报》2010年第6期122-127,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(50578169)

摘　　要：基于剪切位移法,引入Mylonakis & Gazetas桩-土相互作用及E.Winkler地基模型,导出复合地基中桩-桩、桩-土及土-土相互作用柔度系数;在此基础上,考虑垫层的影响,提出一种综合考虑桩-土-垫层共同作用的复合地基分析方法,并利用Matlab软件编制相应的计算程序。为了验证该方法的可行性,对夯实水泥土楔形桩和圆柱形桩复合地基进行模型对比试验,并利用该方法对模型试验进行计算分析,试验及理论结果均表明,对于夯实水泥土楔形桩复合地基,在置换率相同的条件下,夯实水泥土楔形桩复合地基的承载力随楔角的增大而增大,但从平均直径与圆柱形桩直径相等的夯实水泥土楔形桩复合地基的承载力同夯实水泥土圆柱形桩复合地基的承载力相比提高的幅度来看,存在一个合理的楔角,合理的楔角范围约1°～3.5°。Based on the shear displacement method, the Mylonakis ＆ Gazetas model for mutual action between pile and soil, and the E. Winkler foundation model were introduced. Flexibility factors for mutual action between piles, between pile and soil, and between soils were provided. Considering the performance of cushion, a method is derived for analysis of pile-soil-cushion mutual action in the composite foundation. In order to validate the feasibility of the proposed approach, static load model tests for the composite foundation with rammed soil-cement tapered piles and cylindrical piles were conducted in the laboratory. The method was employed to analyze the models, and the experimental and theoretical results indicated that, for the composite foundations with rammed soil-cement tapered piles under the condition of constant replacement ratio, when the wedge angle increases, the bearing capacity of the composite foundation increases. To increase the bearing capacity of the composite foundation as opposed to the composite foundation with rammed soilcement cylindrical piles, the rational range of the wedge is 1° -3.5° approximately.

关 键 词：夯实水泥土楔形桩复合地基 剪切位移法 承载力 Mylonakis&Gazetas及E.Winkler模型 

分 类 号：TU473.12[建筑科学—结构工程]