中国标准与AASHTO标准的预制桩计算对比分析
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摘要
为研究国内外桩基设计差异,结合伊朗德黑兰至伊斯法罕高速铁路建设,开展了中国《建筑桩基技术规范》与美国AASHTO 《Design and Construction of Driven Pile Foundations》的桩基设计区别分析,采用两种标准进行盐湖段预制桩的承载力与沉降计算。结果表明:在承载力计算方面,中国标准和AASHTO标准分别采用安全系数法与作用抗力系数法,但二者的计算原理是相同的;在沉降计算方面,中国标准和AASHTO标准均采用分层总和法,中国标准采用Boussinesq理论且沉降计算为压缩模量法,主要适应于应力历史影响小的地基沉降设计;而AASHTO标准采用应力扩散角法分析附加应力传递规律且沉降计算为e-logp曲线法,其特征在于可有效考虑地层应力历史,采用中国标准和AASHTO计算的盐湖段预制桩承载力与沉降结果差异较小,且反算桩长也基本一致。
To study the differences in pile foundation design at home and abroad and combined with the construction of Tehran to Isfahan high-speed railway in Iran,differential analysis of pile foundation design between Technical Code for Building Pile Foundation of Chinese standards and Design and Construction of Driven Pile Foundations of AASHTO are carried out and two standards are adopted to calculate the bearing capacity and settlement of precast piles in salt lake.The results indicate that:in terms of the calculation of bearing capacity,Chinese standards and AASHTO adopt safety factor method and action resistance factor method respectively,but the calculation principles of the two standards are the same;in terms of settlement calculation,AASHTO and Chinese standards adopt layerwise summation method.The Chinese standards adopt Boussinesq theory and the settlement is calculated by compression modulus method,which is mainly suitable for foundation settlement design with little influence on stress history.While AASHTO adopt the Stress Diffusion Angle method to analyze the extra-stress transfer rules and the settlement is calculated by e-logp curve method,which can be characterized by the effective consideration of the history of stratigraphic stress.The bearing capacity and settlement of precast pile in salt lake calculated by Chinese standard and AASHTO have no significant difference,and the length of pile calculated by inverse methods is basically the same.The research results can provide references for the foundation treatment on subgrade design of overseas high-speed railway.
To study the differences in pile foundation design at home and abroad and combined with the construction of Tehran to Isfahan high-speed railway in Iran,differential analysis of pile foundation design between Technical Code for Building Pile Foundation of Chinese standards and Design and Construction of Driven Pile Foundations of AASHTO are carried out and two standards are adopted to calculate the bearing capacity and settlement of precast piles in salt lake.The results indicate that:in terms of the calculation of bearing capacity,Chinese standards and AASHTO adopt safety factor method and action resistance factor method respectively,but the calculation principles of the two standards are the same;in terms of settlement calculation,AASHTO and Chinese standards adopt layerwise summation method.The Chinese standards adopt Boussinesq theory and the settlement is calculated by compression modulus method,which is mainly suitable for foundation settlement design with little influence on stress history.While AASHTO adopt the Stress Diffusion Angle method to analyze the extra-stress transfer rules and the settlement is calculated by e-logp curve method,which can be characterized by the effective consideration of the history of stratigraphic stress.The bearing capacity and settlement of precast pile in salt lake calculated by Chinese standard and AASHTO have no significant difference,and the length of pile calculated by inverse methods is basically the same.The research results can provide references for the foundation treatment on subgrade design of overseas high-speed railway.
引文
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[8]American Association of State Highway and Transportation Officials(AASHTO).Design and Construction of Driven Pile Foundations:Volume I[S].Woodbury,NY:Ryan R.Berg Associates,Inc.,2016:316-325.
[2]韩信.中欧(法)岩土工程标准规范体系差异研究[J].铁道工程学报,2011,28(11):117-121.HAN X.Research on Differences between Chinese and European(French)standard systems for geotechnical engineering[J].Journal of Railway Engineering Society,2011,28(11):117-121.
[3]田国英,高建敏,翟婉明.高速铁路轨道不平顺管理标准的对比分析[J].铁道学报,2015,37(3):64-71.TIAN G Y,GAO J M,ZHAI W M.Comparative analysis of track irregularity management standards for high-speed railways[J].Journal of the China Railway Society,2015,37(3):64-71.
[4]韩鹏飞.中德高速铁路路基设计主要技术标准对比分析[J].铁道工程学报,2017,34(4):21-24.HAN P F.Comparison and analysis of main technical standards of Germany and China high speed railway subgrade[J].Journal of Railway Engineering Society,2017,34(4):21-24,50.
[5]陈伟志,李安洪,李楚根,等.无砟轨道粗颗粒盐渍土路基设计方法[J].水文地质工程地质,2017,44(6):58-63.CHEN W Z,LI A H,LI C G,et al.Design methods of coarse grained saline soil subgrade in ballastless track[J].Hydrogeology&Engineering Geology,2017,44(6):58-63.
[6]吴沛沛,陈伟志,丁兆锋.高烈度区盐湖软弱盐渍土地基加固关键技术[J].高速铁路技术,2018,9(2):37-42.WU P P,CHEN W Z,DING Z F.Key technology of soft saline soil foundation reinforcement of saline lake in High Intensity Area[J].High Speed Railway Technology,2018,9(2):37-42.
[7]JGJ 94-2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.JGJ 94-2008 Technical Code for Building Pile Foundations[S].Beijing:China Architecture&Building Press,2008.
[8]American Association of State Highway and Transportation Officials(AASHTO).Design and Construction of Driven Pile Foundations:Volume I[S].Woodbury,NY:Ryan R.Berg Associates,Inc.,2016:316-325.