基于混凝土损伤模型的灌注桩水平承载性状分析

doi:10.13722/j.cnki.jrme.2014.s2.080

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摘要单桩水平承载力是抵抗建筑物水平变形、桩基抗震计算的重要参数。水平静载荷试验一般为桩顶自由状态，而实际工程中筏形或者条形基础对桩顶有较强的约束作用；此外，现有设计方法基于弹性反力假设，桩身结构基于线弹性假定，未考虑桩身混凝土开裂对承载力的影响。采用混凝土塑性损伤模型，选取上海典型场地软土试桩验证后，进一步分析竖向荷载、配筋率、桩顶固接条件以及对灌注桩水平承载力影响。分析表明：竖向荷载对桩身混凝土的压应力有利于提高单桩水平承载力；提高配筋率能在一定程度上提高单桩水平承载力，改善后期变形以及桩身延性；桩顶固接约束能够有效提高单桩水平承载力。弹性地基反力m法计算得到桩顶固接与自由状态水平承载力比值与本文差异较大，桩顶固接对水平承载力提高程度有待试验进一步验证。

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	蔡忠祥1
	刘陕南2
	高承勇1
	侯胜男1

关键词 ：桩基础, 灌注桩水平承载性状, 混凝土塑性损伤模型, 竖向荷载, 配筋率, 桩顶固接

Abstract：The lateral bearing capacity of piles is an important parameter for horizontal deformation of building and seismic checking of piles. The determination of test pile is under free-head condition. However，the widely used pile-raft foundations provide a strong constraint for the rotation of pile head. Linear solutions of differential equation for single piles are available and implemented in the traditional design methods. Thus，a numerical analysis is presented to study the behavior of laterally loaded pile based on the concrete damaged plasticity model. After validation with the in-situ test of bored piles in shanghai typical soft soil，the vertical load，reinforcement ratio and fixed-head constraint are considered for the lateral bearing capacity of bored piles. The analysis show that vertical load is benefit for the lateral bearing capacity of piles due to compressive stress. The increment of reinforcement ratio can increase the lateral bearing capacity to some extern，and mainly improve the ductility of piles. The constraint of pile head can increase the bearing capacity to a large extern. The increment factor from the numerical simulation has a significant difference with the m method based on elastic reaction assumption，and further study is hoped in the in-situ test.

Key words： pile foundations lateral response of bored piles concrete damaged plasticity model vertical load reinforcement ratio fixed-head pile

引用本文:

蔡忠祥1，刘陕南2，高承勇1，侯胜男1. 基于混凝土损伤模型的灌注桩水平承载性状分析[J]. 岩石力学与工程学报, 2014, 33(S2): 4032-4040.
CAI Zhongxiang1，LIU Shannan2，GAO Chengyong1，HOU Shengnan1. ANALYSIS OF LATERAL RESPONSE OF BORED PILES BASED ON CONCRETE DAMAGED PLASTICITY MODEL. , 2014, 33(S2): 4032-4040.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.s2.080 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/IS2/4032

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