基于浸水环境的湿陷性黄土灌注桩承载力计算

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摘要 研究目的：当铁路桥梁桩基穿越大厚度湿陷性黄土场地时,目前规范按照最不利状态下的极限值进行负摩阻力计算,导致计算桩身长度过大,造成大量工程投资浪费。本文提出场地浸水环境的概念与分类,考虑地形地貌,重点分析场地的浸水条件与程度,将场地浸水环境分为完全浸水环境、长期浸水环境、短期浸水环境、综合措施环境四种状态。针对不同浸水环境,在负摩阻力计算时,湿陷性土层下限深度取值考虑折减。
研究结论：（1）现行规范在大厚度湿陷性黄土评价方面,适合湿陷性土层较薄的工业民用建筑工程,对于湿陷性土层厚度较大的铁路工程不适用;（2）对于完全浸水环境,按照目前规范推荐值进行计算;对于长期浸水环境,桩周湿陷性土层下限深度计算值可考虑10~15 m;对于短期浸水环境,桩周湿陷性土层下限深度计算值可考虑5~10 m;（3）对大厚度湿陷性黄土场地采用综合措施处理后,可不考虑负摩阻力作用,能够大幅缩短桩长,降低施工难度,节约投资;（4）本研究结果可为湿陷黄土地区的桩基工程设计提供参考。

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	张延杰
	田旺
	王旭
	杨少军
	蒋代军

关键词 ：桩基工程, 湿陷性黄土, 浸水环境, 负摩阻力, 承载力

Abstract：Research purposes: When the pile foundation of a railway bridge passes through a large-thickness collapsible loess site, the current specification calculates the negative friction resistance according to the limit value under the most unfavorable state, which leads to the length of the pile body is too long, resulting in a lot of waste of engineering investment. This paper proposed the concept and classification of a site immersion environment. Considering the topography and landforms, focusing on the analysis of the immersion conditions and degree of the site, the flooding environment of the site is divided into four states: complete immersion environment, long-term immersion environment, short-term immersion environment, and comprehensive treatment measures environment. For different immersion environments, when calculating the negative friction resistance, the lower limit depth of the collapsible soil layer is considered to be reduced.
Research conclusions: (1) In terms of evaluation of collapsible loess with large thicknesses, the current specification is suitable for industrial and civil construction projects with thin collapsible soil layers, but not for railway projects with large-thickness collapsible soil layers. (2)For a complete immersion environment, negative skin friction is calculated according to the recommended method of current specifications. For a long-term immersion environment, the calculated depth of collapsible soil layer around piles can be considered 10~15 m. For a short-term immersion environment, the calculated depth of collapsible soil layer around piles can be considered as 5~10 m. (3) For comprehensive foundation treatment in large-thickness collapsible loess sites, negative skin friction can be ignored, which can shorten pile length, reduce construction difficulty, and save investment. (4) The research results can provide a reference for pile foundation engineering design in collapsible loess regions.

Key words： pile foundation collapsible loess Immersion environment negative skin friction bearing capacity

收稿日期: 2022-03-28

PACS:

TU43

基金资助:国家自然科学基金项目（51868038）; 兰州交通大学“天佑青年托举人才计划”基金项目

作者简介: ** 张延杰,1985年出生,男,副教授。

引用本文:

张延杰, 田旺, 王旭, 杨少军, 蒋代军. 基于浸水环境的湿陷性黄土灌注桩承载力计算[J]. 铁道工程学报, 2024, 41(11): 54-58.
ZHANG Yanjie, TIAN Wang, WANG Xu, YANG Shaojun, JIANG Daijun. Calculation of Bearing Capacity of Cast-in-place Piles in Collapsible Loess Site Based on Immersion Environment. Journal of Railway Engineering Society, 2024, 41(11): 54-58.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2024/V41/I11/54

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