电气化改造工程接触网基础冻结强度试验研究

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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

Received: 23 July 2021

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TU445

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	HE Fei
	WANG Xu

Cite this article:

HE Fei,WANG Xu. Experimental Research on the Freezing Strength of Catenary Foundation in Electrification Reconstruction Project[J]. Journal of Railway Engineering Society, 2023, 40(1): 5-12.

URL:

https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I1/5

[1]	吴紫汪,刘永智.冻土地基与工程建筑[M].北京:海洋出版社,2005:114-115.Wu Ziwang, Liu Yongzhi. Frozen Soil Foundation and Engineering Construction [M]. Beijing: China Ocean Press, 2005:114-115.
[2]	杨平,赵联桢,王国良.冻土与结构接触面循环剪切损伤模型[J].岩土力学,2016(5):1217-1223.Yang Ping, Zhao Lianzhen, Wang Guoliang. A Damage Model for Frozen Soil-structure Interface under Cyclic Shearing [J]. Rock and Soil Mechanics, 2016(5):1217-1223.
[3]	温智,俞祁浩,马巍,等.青藏粉土-玻璃钢接触面力学特性直剪试验研究[J].岩土力学,2013(S2):45-50.Wen Zhi, Yu Qihao, Ma Wei, etc. Direct Shear Tests for Mechanical Characteristics of Interface between Qinghai-Tibetan Silt and Fiberglass Reinforced Plastics[J]. Rock and Soil Mechanics, 2013(S2):45-50.
[4]	吕鹏,刘建坤.冻土与混凝土接触面直剪试验研究[J].铁道学报,2015(2):106-110.Lv Peng, Liu Jiankun. An Experimental Study on Direct Shear Tests of Frozen Soil-concrete Interface [J]. Journal of the China Railway Society,2015(2):106-110.
[5]	吉延峻,贾昆,俞祁浩,等.现浇混凝土-冻土接触面冻结强度直剪试验研究[J].冰川冻土,2017(1):86-91.Ji Yanjun, Jia Kun, Yu Qihao, etc. Direct Shear Tests of Freezing Strength at the Interface between Cast-in-situ Concrete and Frozen Soil [J]. Journal of Glaciology and Geocryology, 2017(1):86-91.
[6]	刘志强,王博,王涛,等.高压冻(融)土-结构接触面剪切应力-应变关系[J].哈尔滨工业大学学报,2021(5):134-140.Liu Zhiqiang, Wang Bo, Wang Tao, etc. Shear Stress-strain Relation of Frozen/thawed Soil-structure Interface under High Pressure [J]. Journal of Harbin Institute of Technology, 2021(5):134-140.
[7]	何鹏飞,马巍,穆彦虎,等.冻融循环对冻土–混凝土界面冻结强度影响的试验研究[J].岩土工程学报,2020(2):299-307.He Pengfei, Ma Wei, Mu Yanhu, etc. Experiment Study on Effects of Freeze-thaw Cycles on Adfreezing Strength at Frozen Soil-concrete Interface[J]. Chinese Journal of Geotechnical Engineering,2020(2):299-307.
[8]	王磊,朱斌,来向华. 砂土循环累积变形规律与显式计算模型研究[J].岩土工程学报,2015(11):2024-2029.Wang Lei, Zhu Bin, Lai Xianghua. Cyclic Accumulative Deformation of Sand and Its Explicit Model [J]. Chinese Journal of Geotechnical Engineering, 2015(11):2024-2029.
[9]	孙兆辉,卞汉兵,王宸宇,等.粉质黏土-混凝土衬砌接触面冻结强度影响因素显著性分析[J].冰川冻土,2020(2):508-514.Sun Zhaohui, Bian Hanbing, Wang Chenyu,etc. Significance Analysis of Factors of Freezing Strength between Silty Clay and Concrete Lining[J]. Journal of Glaciology and Geocryology, 2020(2):508-514.