电气化改造工程接触网基础冻结强度试验研究

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摘要 研究目的:为保证格拉段电气化改造工程接触网基础的正常工作和长期稳定,需重点研究接触网基础与冻土的冻结强度及其影响因素。本文采用大型应力控制式剪切仪开展多种温度和含水率条件下冻结粉土与混凝土接触面的直剪试验研究。
研究结论:(1)接触面剪切应力-位移曲线主要分为弹性变形、塑性变形和滑动破坏三个阶段;(2)接触面抗剪强度与法向应力呈正比,与冻结温度呈反比;(3)当试样含水率低于饱和含水率时,随着含水率的增大,接触面抗剪强度增大,超过饱和含水率时,接触面抗剪强度随含水率的增大略有减小;(4)温度越低,接触面内摩擦角越小,黏聚力越大,黏聚力对接触面冻结强度的作用越突显,接触面黏聚力随含水率的增大先增大后减小,内摩擦角随含水率的增大而减小;(5)本研究成果可为多年冻土区接触网基础的设计提供参考。

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	何菲
	王旭

关键词 ：冻结粉土-混凝土, 接触面, 温度, 含水率, 试验研究

Abstract：Research purposes: In order to ensure normal work and long-term stabilities of catenary foundations of the electrification reconstruction project of Golmud to Lhasa Section, it is necessary to focus on the freezing strength of the catenary foundation and frozen soil and its influencing factors. In this paper, direct shear tests of the contact surface between frozen silt and concrete under various temperatures and moisture contents were carried out by using a large stress controlled shear apparatus.
Research conclusions:(1) The shear stress-displacement curve of the contact surface is mainly divided into three stages: elastic deformation, plastic deformation and sliding failure. (2) The shear strengths of the contact surface are proportional to the normal stress, and inversely proportional to the freezing temperature. (3) When the moisture content of the sample is lower than the saturated moisture content, the shear strength of the contact surface increases with the increase of moisture content. When the moisture content of a sample exceeds the saturated moisture content, the shear strength of the contact surface decreases slightly with the increase of the moisture content. (4) With the decrease of temperature, the internal friction angle of the contact surface decreases, and the cohesion increases linearly. The effect of cohesion on the freezing strength of the contact surface is more prominent. The cohesion of the contact surface increases first and then decreases with the increase of water content, and the internal friction angle decreases with the increase of water content. (5) The research results can provide a reference for design of catenary foundation in permafrost regions.

Key words： frozen silt - concrete contact surface temperature moisture content experimental study

收稿日期: 2021-07-23

PACS:

TU445

基金资助:国家自然基金青年基金项目(41902272);中央引导地方科技发展资金项目(22ZY1QA005);甘肃省基础研究创新群体项目(21JR7RA347)

作者简介: ** 何菲,1988年出生,女,副教授;王旭,1965年出生,男,教授。

引用本文:

何菲, 王旭. 电气化改造工程接触网基础冻结强度试验研究[J]. 铁道工程学报, 2023, 40(1): 5-12.
HE Fei, WANG Xu. Experimental Research on the Freezing Strength of Catenary Foundation in Electrification Reconstruction Project. Journal of Railway Engineering Society, 2023, 40(1): 5-12.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I1/5

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