流塑状软土复合地基桩土相互作用机理的研究

发布时间：2018-04-11 04:28

本文选题：高速铁路 + 流塑状软土　；参考：《铁道建筑》2015年12期

【摘要】：为解决流塑状软土地基处理中存在的问题,对单根桩在流塑状软土中的工作机理进行了有限元分析,研究了桩土模量比、桩体与滑弧切线夹角、土体抗剪强度对桩体的抗剪特性、破坏模式及桩土相互作用机理的影响。研究结果表明:桩体刚度、桩土模量差异、土体抗剪强度、桩体与滑弧切线间夹角等是影响桩体视抗剪强度(地基所提供的抗滑力减去土体提供的抗滑力)的主要因素;随着桩土模量比及桩体与滑弧切线间夹角的减小,桩体视抗剪强度逐渐增加;随着桩土模量差异逐渐增大,桩体可能发生的破坏模式依次为抗剪切破坏、受拉(压)破坏、弯曲破坏、土体绕流破坏、桩体倾倒破坏和桩体整体侧移破坏,对应不同破坏模式桩体具有不同的视抗剪强度。
[Abstract]:In order to solve the problems existing in the treatment of fluid-plastic soft soil foundation, the working mechanism of single pile in fluid-plastic soft soil is analyzed by finite element method, and the ratio of pile-soil modulus and the angle between pile and slip arc tangent line are studied.The influence of soil shear strength on the shear resistance of pile, failure mode and pile-soil interaction mechanism.The results show that the stiffness of pile, the difference of modulus of pile and soil, the shear strength of soil, the angle between pile and slip arc tangent are the main factors that affect the apparent shear strength of pile (the anti-slide force provided by the foundation minus the anti-slip force provided by the soil).With the decrease of the modulus ratio of pile to soil and the angle between pile and slip arc tangent, the apparent shear strength of pile increases gradually, and with the difference of modulus of pile and soil, the possible failure mode of pile is shear failure and tensile (compression) failure.Bending failure, soil flow failure, pile toppling failure and pile whole lateral displacement failure have different apparent shear strength corresponding to different failure modes.
【作者单位】：中国铁道科学研究院;中国铁道科学研究院铁道建筑研究所;
【基金】：中国铁路总公司科技研究开发计划课题(2014G003-B,2014G003-D,2015G006-D) 中国铁道科学研究院基金项目(2015YJ141) 国家自然科学基金(51308547)
【分类号】：TU470

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