中国标准与AASHTO标准的预制桩计算对比分析  

Comparison and Analysis of Precast Piles Based on Chinese Standards and AASHTO

作　　者：胡会星[1] 陈伟志[1] 吴沛沛[1] 郭在旭[1] HU Huixing;CHEN Weizhi;WU Peipei;GUO Zaixu(China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《路基工程》2019年第1期126-130,共5页Subgrade Engineering

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 -log p 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.

关 键 词：盐湖 预制桩 中国标准 AASHTO标准 承载力 沉降 

分 类 号：TU473.13[建筑科学—结构工程]