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工业建筑  2010 

黏性土中静压桩挤土时效性的室内应变保持试验研究

DOI: 10.13204/j.gyjz201005013, PP. 62-69

Keywords: 黏性土,静压桩承载力,时效性,应变保持试验

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Abstract:

许多学者基于圆孔扩张理论,采用挤土应力不变的假设给出了黏性土中挤土桩承载力时效性的解析解答,但是原位试验表明作用在桩壁上的挤土应力是不断衰减的。通过利用应力路径三轴仪进行应变保持试验,模拟沉桩及随后的桩周土体的应力状态和物理性质的改变。试验结果表明沉桩后作用在桩壁上的作用力近似呈对数衰减,桩周土体有效应力先减小后增大,固结完成后有效应力增量仅为(0.2~0.27)倍的超静孔隙水压力。因而,采用挤土应力不变的假设将导致过高估计桩基承载力的时效性。

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