|本期目录/Table of Contents|

[1]张莎莎,刘亚超,杨晓华,等.粗粒盐渍土区既有高铁路基变形特性试验研究[J].建筑科学与工程学报,2022,39(02):135-142.[doi:10.19815/j.jace.2021.04026]
 ZHANG Sha-sha,LIU Ya-chao,YANG Xiao-hua,et al.Experimental Study on Deformation Characteristics of Existing High-speed Railway Subgrade in Coarse Saline Soil Area[J].Journal of Architecture and Civil Engineering,2022,39(02):135-142.[doi:10.19815/j.jace.2021.04026]
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粗粒盐渍土区既有高铁路基变形特性试验研究(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
39卷
期数:
2022年02期
页码:
135-142
栏目:
基础工程
出版日期:
2022-03-30

文章信息/Info

Title:
Experimental Study on Deformation Characteristics of Existing High-speed Railway Subgrade in Coarse Saline Soil Area
文章编号:
1673-2049(2022)02-0135-08
作者:
张莎莎1刘亚超1杨晓华1陈伟志2金好乾1
(1. 长安大学 公路学院,陕西 西安 710064; 2. 中铁二院工程集团有限责任公司,四川 成都 610031)
Author(s):
ZHANG Sha-sha1 LIU Ya-chao1 YANG Xiao-hua1 CHEN Wei-zhi2 JIN Hao-qian1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Railway Eryuan Engineering Group Co.Ltd, Chengdu 610031, Sichuan, China)
关键词:
高速铁路 路基工程 溶陷特性 冻融循环 模型试验
Keywords:
high-speed railway subgrade engineering collapse characteristic freeze thaw cycle model test
分类号:
TU448
DOI:
10.19815/j.jace.2021.04026
文献标志码:
A
摘要:
为了探究某既有高速铁路路基变形特性,对路基填料进行了基础物理化学试验,得到了颗粒级配、最大干密度、最佳含水率和易溶盐含量等基本工程性质,然后选取典型标段路基填料,分别开展室内单次降温盐胀试验、溶陷试验、冻融循环试验和现场大型溶陷试验。结果表明:该段路基土体在单次降温试验中的最大盐胀率为0.96%,最大盐胀变形量与土样不均匀系数之间存在线性关系,土样最终盐胀量在很大程度上取决于土样级配和硫酸根离子含量; 在最不利工况下土样的最大溶陷系数为0.012,K87+950标段土样最终溶陷量最大,为5.67 mm,最大变形率为4.7%; K87+950标段路基变形量随温度变化呈现V形下降趋势,在第5次冻融循环周期相对融沉量达到最大,7次冻融循环后硫酸根离子沿土样高度呈现M形分布; 土样顶部接近制冷头部位的含水率明显增加,底部含水率减少,20~40 cm高度范围内土样含水率无明显变化,距土样顶部15~30 cm层位范围盐胀变形量最大; 由现场溶陷试验可知,注水量达到30 mm时,K31+000试验点路基溶陷量可达到最终溶陷量的80%,极端降雨不会引起该既有路基发生较大溶陷变形。
Abstract:
In order to explore the deformation characteristics of an existing high-speed railway subgrade, the basic physical and chemical tests of the subgrade filler were carried out, and the basic engineering properties such as particle size distribution, maximum dry density, optimum moisture content and soluble salt content were obtained. Then, the typical subgrade filler was selected to carry out indoor single cooling salt expansion test, collapse test, freeze-thaw cycle test and field large-scale collapse test. The results show that the maximum salt expansion rate of the subgrade soil in a single cooling test is 0.96%. There is a linear relationship between the maximum salt expansion deformation and the soil sample coefficient of uniformity. The final salt expansion of soil sample depends on the grading of soil sample and the content of sulfate ion to a large extent. The maximum collapse coefficient of soil sample under the most unfavorable condition is 0.012, the final collapse of K87+950 section is the largest, which is 5.67 mm, and the maximum deformation rate is 4.7%. The subgrade deformation of K87+950 section presents a V type downward trend with the change of temperature, and the relative thaw settlement reaches the maximum in the fifth freeze-thaw cycle. The sulfate ion presents a M type distribution along the soil sample height after the seventh freeze-thaw cycle.The moisture content at the top of the soil sample near the refrigeration head increases obviously, while the moisture content at the bottom decreases. The moisture content of the soil sample has no obvious change in the height range of 20-40 cm, and the salt expansion deformation is the largest in the range of 15-30 cm from the top of the soil sample. According to the field collapse test, when the water injection amount reaches 30 mm, the collapse amount of K31+000 test point subgrade can reach 80% of the final collapse amount, and extreme rainfall will not cause large collapse deformation of the subgrade.

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相似文献/References:

[1]吕志涛.高速铁路桥梁建设中的结构问题[J].建筑科学与工程学报,2006,23(03):1.
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备注/Memo

备注/Memo:
收稿日期:2021-04-13
基金项目:陕西省自然科学基础研究计划项目(2019JM-147); 中铁重大科研项目(2017-重大-11-04)
作者简介:张莎莎(1982-),女,山西运城人,副教授,工学博士,E-mail:zss_lx@126.com。通信作者:刘亚超(1995-),男,山东滨州人,工学硕士研究生,E-mail:583396948@qq.com。
更新日期/Last Update: 2022-03-20