«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

《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.

参考文献/References:

[1] 费雪良,李 斌,王家澄.不同密度硫酸盐渍土盐胀规律的试验研究[J].冰川冻土,1994,16(3):245-250.
FEI Xue-liang,LI Bin,WANG Jia-cheng.Experimental Researches on Salt Heaving of Sulphate Treated Soil with Different Dry Densities[J].Journal of Glaciology and Geocryology,1994,16(3):245-250.
[2]张莎莎,杨晓华,戴志仁.基于均匀设计的砾类硫酸盐渍土盐胀特性试验研究[J].公路交通科技,2009,26(5):29-34.
ZHANG Sha-sha,YANG Xiao-hua,DAI Zhi-ren.Experimental Study on Salt Expansion of Gravel Sulfate Salty Soil Based on Uniform Design[J].Journal of Highway and Transportation Research and Development,2009,26(5):29-34.
[3]张莎莎,杨晓华,王 龙.单因素对粗粒盐渍土的盐胀规律影响效果研究[J].水利学报,2015,46(增1):129-134.
ZHANG Sha-sha,YANG Xiao-hua,WANG Long.Research on the Law of Salt Expansion of Crude Coarse Grained Saline Soil with the Changing of Single Factors[J].Journal of Hydraulic Engineering,2015,46(S1):129-134.
[4]张莎莎,谢永利,杨晓华,等.典型天然粗粒盐渍土盐胀微观机制分析[J].岩土力学,2010,31(1):123-127.
ZHANG Sha-sha,XIE Yong-li,YANG Xiao-hua,et al.Research on Microstructure of Crude Coarse Grain Saline Soil Under Freezing and Thawing Cycles[J].Rock and Soil Mechanics,2010,31(1):123-127.
[5]张莎莎,戴志仁,杨晓华,等.上覆荷载对砾砂类硫酸盐渍土路基盐胀的影响[J].中国铁道科学,2019,40(2):1-8.
ZHANG Sha-sha,DAI Zhi-ren,YANG Xiao-hua,et al.Effect of Overburden Load on Salt Expansion of Gravelly Sand Sulfate Saline Soil Subgrade[J].China Railway Science,2019,40(2):1-8.
[6]张莎莎,王旭超,杨晓华,等.含盐施工用水对路基填料工程特性的累加效应[J].交通运输工程学报,2020,20(6):71-81.
ZHANG Sha-sha,WANG Xu-chao,YANG Xiao-hua,et al.Cumulative Effect of Saline Construction Water on Engineering Properties of Subgrade Filling Material[J].Journal of Traffic and Transportation Engineering,2020,20(6):71-81.
[7]ZHANG M Y,ZHANG X Y,LAI Y M,et al.Variations of the Temperatures and Volumetric Unfrozen Water Contents of Fine-grained Soils During a Freezing-thawing Process[J].Acta Geotechnica,2020,15(3):595-601.
[8]LAI Y M,WAN X S,ZHANG M Y.An Experimental Study on the Influence of Cooling Rates on Salt Expansion in Sodium Sulfate Soils[J].Cold Regions Science and Technology,2016,124:67-76.
[9]XIAO Z A,LAI Y M,YOU Z M,et al.The Phase Change Process and Properties of Saline Soil During Cooling[J].Arabian Journal for Science and Engineering,2017,42(9):3923-3932.
[10]包卫星,张莎莎.路用砂类盐渍土盐胀及融陷特性试验研究[J].岩土工程学报,2016,38(4):734-739.
BAO Wei-xing,ZHANG Sha-sha.Experimental Study on Salt Expansion and Thawing Subsidence Properties of Sandy Saline Soil[J].Chinese Journal of Geotechnical Engineering,2016,38(4):734-739.
[11]杨晓华,张志萍,张莎莎.高速公路盐渍土地基溶陷特性离心模型试验[J].长安大学学报(自然科学版),2010,30(2):5-9.
YANG Xiao-hua,ZHANG Zhi-ping,ZHANG Sha-sha.Centrifugalize Model Test on Dissolve Collapse of Saline Soil Under Expressway[J].Journal of Chang'an University(Natural Science Edition),2010,30(2):5-9.
[12]肖泽岸,赖远明.冻融和干湿循环下盐渍土水盐迁移规律研究[J].岩石力学与工程学报,2018,37(增1):3738-3746.
XIAO Ze-an,LAI Yuan-ming.Study on Water and Salt Transfer Mechanism in Saline Soil Under Freezing-thawing and Dry-wet Conditions[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(S1):3738-3746.
[13]肖泽岸,赖远明,尤哲敏.冻融循环作用下含盐量对Na₂SO₄土体变形特性影响的试验研究[J].岩土工程学报,2017,39(5):953-960.
XIAO Ze-an,LAI Yuan-ming,YOU Zhe-min.Experimental Study on Impact of Salt Content on Deformation Characteristics of Sodium Sulfate Soil Under Freeze-thaw Conditions[J].Chinese Journal of Geotechnical Engineering,2017,39(5):953-960.
[14]ZHANG S S,ZHANG J S,GUI Y L,et al.Deformation Properties of Coarse-grained Sulfate Saline Soil Under the Freeze-thaw-precipitation Cycle[J].Cold Regions Science and Technology,2020,177:103121.
[15]ZHANG S S,YANG X H,XIE S J,et al.Experimental Study on Improving the Engineering Properties of Coarse Grain Sulphate Saline Soils with Inorganic Materials[J].Cold Regions Science and Technology,2020,170:102909.
[16]文 桃,米海珍,马连生,等.硫酸钠盐渍土击实特性与压实度评价试验研究[J].岩土力学,2016,37(12):3455-3462,3471.
WEN Tao,MI Hai-zhen,MA Lian-sheng,et al.Experiment and Evaluation of Compaction Characteristics of Sodium Sulfate Saline Soil[J].Rock and Soil Mechanics,2016,37(12):3455-3462,3471.
[17]张建渊,胡海东,沈 鑫.兰新高速铁路沿线盐渍土地基的溶陷特性[J].铁道建筑,2018,58(3):59-63.
ZHANG Jian-yuan,HU Hai-dong,SHEN Xin.Collapsibility Characteristics of Saline Soil Foundation in Lanzhou-Xinjiang High Speed Railway[J].Railway Engineering,2018,58(3):59-63.
[18]张沛然,黄雪峰,杨校辉,等.盐渍土水-热场耦合效应与盐胀变形试验[J].岩土力学,2018,39(5):1619-1624.
ZHANG Pei-ran,HUANG Xue-feng,YANG Xiao-hui,et al.Experiment on Coupling Effect of Water and Thermal Field and Salt-expansion Deformation of Salty Soil[J].Rock and Soil Mechanics,2018,39(5):1619-1624.
[19]WAN X S,YANG Z H.Pore Water Freezing Characteristic in Saline Soils Based on Pore Size Distribution[J].Cold Regions Science and Technology,2020,173:103030.
[20]周凤玺,周立增,王立业,等.温度梯度作用下非饱和盐渍土水盐迁移及变形特性研究[J].岩石力学与工程学报,2020,39(10):2115-2130.
ZHOU Feng-xi,ZHOU Li-zeng,WANG Li-ye,et al.Study on Water and Salt Migration and Deformation Properties of Unsaturated Saline Soil Under Temperature Gradient[J].Chinese Journal of Rock Mechanics and Engineering,2020,39(10):2115-2130.
[21]许 健,张明辉,李彦锋,等.Na₂SO₄盐渍原状黄土冻融过程劣化特性试验研究[J].岩土工程学报,2020,42(9):1642-1650.
XU Jian,ZHANG Ming-hui,LI Yan-feng,et al.Experimental Study on Deterioration Behavior of Saline Undisturbed Loess with Sodium Sulphate Under Freeze-thaw Action[J].Chinese Journal of Geotechnical Engineering,2020,42(9):1642-1650.
[22]杨晓华,张莎莎,刘 伟,等.粗颗粒盐渍土工程特性研究进展[J].交通运输工程学报,2020,20(5):22-40.
YANG Xiao-hua,ZHANG Sha-sha,LIU Wei,et al.Research Progress on Engineering Properties of Coarse-grained Saline Soil[J].Journal of Traffic and Transportation Engineering,2020,20(5):22-40.

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.
　LV Zhi-tao.Structural Problems in High-Speed Railway Bridge Construction[J].Journal of Architecture and Civil Engineering,2006,23(02):1.

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。

常用功能

更新日期/Last Update: 2022-03-20