| 高铁CFG桩-筏复合地基固结解析解及特性 |
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| 引用本文： | 商拥辉,徐林荣,陈钊锋.高铁CFG桩-筏复合地基固结解析解及特性[J].中国铁道科学,2021(1):1-8. |
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| 作者姓名： | 商拥辉 徐林荣 陈钊锋 |
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| 作者单位： | 黄淮学院建筑工程学院;中南大学土木工程学院;中南大学高速铁路建造技术国家工程实验室 |
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| 基金项目： | 国家自然科学基金资助项目(51778634);中国博士后科学基金资助项目(2020M682589);河南省科技攻关项目(202102310264);河南省教育厅重点项目(20B580003)。 |
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| 摘 要： | 考虑桩—土在刚度、渗透性等方面的差异,建立端承型CFG桩—筏复合地基轴对称固结模型,推导桩间土的固结方程,并给出“单级等速加载”情况下固结方程的解析解;应用该解析解结合工程实例进一步研究置换率、桩—土压缩模量比、加荷速率地基设计参数对固结特性的影响。结果表明:桩的作用增大复合地基等价固结系数,固结速率随置换率、桩—土压缩模量比、加荷速率的增大而提升,该工程软土地基的置换率和桩—土压缩模量比适宜范围分别为0.03~0.06和100~150。
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| 关 键 词： | 高速铁路 桩—筏复合地基 解析解 固结特性 设计参数 |
Analytical Solution and Consolidation Features of CFG Pile-Raft Composite Foundation for High-Speed Railway |
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| SHANG Yonghui,XU Linrong,CHEN Zhaofeng.Analytical Solution and Consolidation Features of CFG Pile-Raft Composite Foundation for High-Speed Railway[J].China Railway Science,2021(1):1-8. |
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| Authors: | SHANG Yonghui XU Linrong CHEN Zhaofeng |
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| Affiliation: | (School of Architecture and Civil Engineering,Huanghuai University,Zhumadian Henan 463000,China;School of Civil Engineering,Central South University,Changsha Hunan 410075,China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha Hunan 410075,China) |
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| Abstract: | Considering the differences between pile and soil in stiffness and permeability,the axisymmetric consolidation model of the end-bearing CFG pile-raft composite foundation was established.The consolidation equation of soil between piles was derived,and the analytical solution of the consolidation equation under the condition of“single-stage constant velocity loading”was given.Based on the analytical solution,the influence of foundation design parameters such as replacement ratio,pile-soil compression modulus ratio and loading rate on consolidation characteristics was further explored with engineering examples.Results show that the equivalent consolidation coefficient of composite foundation increases with the effect of pile.The consolidation rate of composite foundation increases with the increase of replacement ratio,pile-soil compression modulus ratio and loading rate.The appropriate ranges of replacement ratio and pile-soil compression modulus ratio for the soft soil foundation of the project are 0.03—0.06 and 100—150,respectively. |
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| Keywords: | High-speed railway Pile-raft composite foundation Analytic solution Consolidation features Design parameters |
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