管桩水泥土复合桩荷载传递规律研究

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摘要管桩水泥土复合桩是一种新桩型，可用于软土地基处理。为研究其荷载传递规律，采用现场荷载试验、桩身光纤光栅应力测试及数值模拟，分析各级荷载下管桩及水泥土桩身轴力、桩侧摩阻力及桩端阻力分布特征。研究管桩、水泥土有效复合变形协调条件及各自荷载承担比例；给出各段压缩量随桩顶荷载的变化规律；比较该桩型区别于一般管桩的沉降、抗力特点。研究表明：复合桩Q-s曲线呈缓变型；管桩是上部荷载的主要承担者，其工作特性与刚性单桩相似；桩端阻力占桩顶荷载比例较小，复合桩表现出摩擦桩的工作特性；管桩和水泥土侧摩阻力分布规律相似，其比值约为水泥土和管桩外径的比值。

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关键词 ：桩基础, 光纤布拉格光栅, 荷载传递规律, 现场试验, 数值模拟

Abstract：The composite pile composed of jet-mixing cement and PHC pipe pile with core concrete(CPCP) is a new kind of composite pile used in soft ground treatment. For practical project，the static load test associated with fiber Bragg grating(FBG) stress tests and numerical simulations was conducted to understand the load transfer mechanism of the composite pile. With the pile tests，the side friction resistance and the tip resistance were measured in terms of axial stresses under different loads. Then the compatible deformation of pipe pile and cement-soil is obtained associated with their stress distribution. The change rule of compression of each segment is also achieved with the imposed top load. Finally，the differences between general pipe pile and CPCP in terms of resistance characteristics were compared. It shows that：(1) load-displacement(Q-s) curve of pile head varies gradually；(2) pipe pile rather than cement-soil bears a majority of structural load，whilst the bearing capacity characteristics of the composite pile are similar to those of the rigidity piles；(3) pile tip resistance takes a rather smaller percentage of the top load，suggesting the same performance as that of friction piles. Distribution of pipe pile and cement-soil friction resistance is similar，about the ratio of CPCP diameter to PHC diameter.

Key words： pile foundations fiber Bragg grating(FBG) load transfer mechanism field test numerical simulations

收稿日期: 2013-08-13

引用本文:

李俊才1，张永刚1，邓亚光2，华小龙1. 管桩水泥土复合桩荷载传递规律研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3068-3076.
LI Juncai1，ZHANG Yonggang1，DENG Yaguang2，HUA Xiaolong1. LOAD TRANSFER MECHANISM OF COMPOSITE PILE COMPOSED OF JET-MIXING CEMENT AND PHC PILE WITH CORE CONCRETE. , 2014, 33(sl): 3068-3076.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3068

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