不同初始含水率条件下欠固结软黏土地基单桩负摩阻力模型试验研究

doi:10.13722/j.cnki.jrme.2022.0135

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摘要海涂围垦形成的软黏土地基一般为欠固结土地基。为了研究垦区欠固结软黏土地基中的桩基负摩阻力规律，考虑不同桩周土初始含水率，以及自重固结和堆载2种工况，开展4组单桩模型试验，基于试验结果分析摩擦型管桩的桩土位移、桩身轴力、桩侧负摩阻力及中性点位置等特性。试验结果表明，不论在堆载还是自重固结条件下，随着桩周土含水率的提高，桩身沉降、土体沉降、桩身轴力及桩侧负摩阻力总体成增大趋势，桩周土初始含水率的降低引起的中性点位置的升高。在堆载条件下，中性点位置随着荷载等级的提高而下移；自重固结条件下，中性点位置随固结时间变化不大。在工程实际中，桩周土初始含水率的增加会扩大负摩阻力范围，增大负摩阻力峰值和桩身轴力，因此需要注意其对欠固结软黏土地基桩基负摩阻力的影响。

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	谷川1
	2
	王林伟1
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	王军1
	2
	张婷婷3
	蔡袁强4
	林刚5

关键词 ：桩基础, 欠固结土, 负摩阻力, 模型试验, 中性点

Abstract：The soft clay foundation formed by tideland reclamation is generally unconsolidated. To study the behavior of negative skin friction of a pile in unconsolidated soft clay foundation，4 single-pile model tests were performed，in which different initial water contents of soft clay and two working conditions including self-weight consolidation and surcharge were considered. The characteristics of relative displacement between pile and soil，axial force of pile，negative skin friction and neutral plane position were investigated based on the test results. In both self-weight consolidation and surcharge conditions，the increase of the initial water content leads to the increase of pile settlement，clay settlement，axial force of pile and negative skin friction，and the decrease of the initial water content induces the rise of neutral plane position. In the condition of surcharge，the increase of vertical load leads to the drop of neutral plane position，while in the condition of self-weight consolidation the consolidation time has little effects on the position of neutral plane. In engineering practice，the initial water content of clay foundation should be pained attention since it would cause the increase of negative skin friction and pile axial force.

Key words： pile foundation unconsolidated clay negative skin friction model test neutral point

引用本文:

谷川1，2，王林伟1，2，王军1，2，张婷婷3，蔡袁强4，林刚5. 不同初始含水率条件下欠固结软黏土地基单桩负摩阻力模型试验研究[J]. 岩石力学与工程学报, 2022, 41(12): 2554-2566.
GU Chuan1，2，WANG Linwei1，2，WANG Jun1，2，ZHANG Tingting3，CAI Yuanqiang4，LIN Gang5. Model tests on the negative skin friction of a pile in unconsolidated soft clay foundation with various initial water contents. , 2022, 41(12): 2554-2566.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0135 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2554

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