沉井基础竖向承载特性的离心模型试验研究

发布时间：2018-04-14 10:28

本文选题：沉井基础 + 离心模型试验　；参考：《铁道标准设计》2016年12期

【摘要】：基于离心模型试验对饱和砂土地基中沉井基础在竖向荷载作用下的承载特性进行研究,初步掌握地基极限承载力随基础埋深和基础宽度变化的规律,并对试验结果进行对比分析,结果表明:(1)基础埋深不大于5 m时,荷载-沉降曲线为陡降型,有明显的拐点出现,可取拐点对应的荷载作为极限承载力;基础埋深不小于10 m时,荷载-沉降曲线为缓变型,未出现明显的拐点,建议取相对沉降量(基础的实测沉降量与基础宽度的比值)对应的荷载作为极限承载力。(2)在均质地基环境中,极限承载力随基础相对埋深的增加近似呈指数型曲线增长。(3)进一步推求沉井基础极限承载力随基础宽度和相对埋深变化的函数表达式,其成果可用于估算砂土地基中沉井基础的地基极限承载力。
[Abstract]:On the basis of centrifugal model test, the bearing characteristics of caisson foundation in saturated sand foundation under vertical load are studied, and the variation of ultimate bearing capacity with the depth of foundation and width of foundation is preliminarily understood.The results show that when the depth of the foundation is less than 5 m, the load-settlement curve is steeply descending, with obvious inflection point, and the load corresponding to the inflection point should be regarded as the ultimate bearing capacity.When the depth of the foundation is not less than 10 m, the load-settlement curve is of slow deformation, and there is no obvious inflection point.It is suggested that the load corresponding to the relative settlement (the ratio of the measured settlement of the foundation to the width of the foundation) should be taken as the ultimate bearing capacity.The ultimate bearing capacity increases exponentially with the increase of the relative buried depth of the foundation.) the functional expression of the ultimate bearing capacity of the caisson foundation varies with the width of the foundation and the relative buried depth is derived.The results can be used to estimate the ultimate bearing capacity of caisson foundation in sand foundation.
【作者单位】：西南交通大学;中铁大桥勘测设计院集团有限公司;
【基金】：中国铁路总公司科技研究开发计划(2013G001-A-2)
【分类号】：TU753.64

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