铁路桥梁桩基优化计算方法研究

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摘要 研究目的:铁路工程总承包项目设计时,桥梁桩基础体量庞大、控制因素繁多,存在较大优化空间。本文从桩基类型、桩长、桩身配筋等方面进行研究,在满足桩基设计安全和质量要求的前提下,提出桩基优化计算方法。
研究结论:(1)构建了旋挖挤扩灌注桩的具体计算方法和流程,增加了桩基类型的比选方案;(2)提出了地震荷载下桩长优化的联动迭代算法,准确计算出桥墩摩擦桩基础的最优桩长;(3)提出等效地质参数法模拟上覆淤泥层较厚时的桩基计算,优化桩身配筋量效果明显;(4)提出了三次坐标转换的计算方法,解决了桥墩与基础产生扭角时计算精度不够的问题;(5)以上算法纳入桩基计算系统,大规模应用于多条铁路总承包项目,实现了铁路桥梁桩基础的精细化计算,满足了高经济性、高安全性与高质量的设计需求,为各项目节约了0.5亿~1.8亿不等的工程造价,可为铁路桥梁桩基结构优化设计提供借鉴。

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	廖立坚
	杨新安
	王雨权
	王秀艳

关键词 ：铁路工程总承包, 桩基类型比选, 桩长优化, 桩身配筋优化

Abstract：Research purposes:In the design of railway engineering general contracting project, the bridge pile foundation has a large volume and many control factors, so there is a large space for optimization. In this paper, the type of pile foundation, pile length, pile body reinforcement and other aspects are studied, on the premise of meeting the requirements of design safety and quality of pile foundation, the optimization calculation method of pile foundation is put forward.
Research conclusions:(1)The concrete calculation method and flow of cast-in-place piles with rotary expanded bulbs were constructed, and the comparison and selection scheme of pile foundation type was added. (2)A linkage iterative algorithm for pile length optimization under seismic load was proposed to accurately calculate the optimal pile length of friction pile foundation of bridge pier. (3)The equivalent geological parameter method was proposed to simulate the pile foundation calculation when the overburden silt layer is thick, and the optimization effect of pile reinforcement is obvious. (4)The calculation method of cubic coordinate transformation was proposed to solve the problem of insufficient calculation accuracy when the bridge pier and foundation produce torsion angle. (5)The above algorithms were incorporated into the pile foundation calculation system and applied in a large number of railway general contracting projects, realizing the fine calculation of railway bridge pile foundation, meeting the design requirements of high economy, high safety and high quality, and saving the engineering cost ranging from 50 million to 180 million for each project. The research results can provide reference for the optimization design of railway bridge pile foundation structure.

Key words： general contracting of railway engineering pile type comparison and selection pile length optimization pile reinforcement optimization

收稿日期: 2022-09-26

PACS:

U24

基金资助:中国铁路设计集团有限公司科技开发课题(2021A240602);中国国家铁路集团有限公司科技研究开发计划(N2022G064)

作者简介: ** 廖立坚,1982年出生,男,高级工程师。

引用本文:

廖立坚, 杨新安, 王雨权, 王秀艳. 铁路桥梁桩基优化计算方法研究[J]. 铁道工程学报, 2023, 40(2): 53-58.
LIAO Lijian, YANG Xinan, WANG Yuquan, WANG Xiuyan. Research on the Optimization Calculation Method of Railway Bridge Pile Foundation. Journal of Railway Engineering Society, 2023, 40(2): 53-58.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I2/53

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