[1]刘海翔,柴明霞,马艳霞,等.冻融循环条件下细粒硫酸盐渍土盐冻胀力学特性试验研究[J].西安建筑科技大学学报(自然科学版),2024,56(01):23-29,73.[doi:10.15986/j.1006-7930.2024.01.004]
　LIU Haixiang,CHAI Mingxia,MA Yanxia,et al. Experimental study on salt frost heaving mechanical properties of fine-grained sulfate saline soil under freeze-thaw cycle conditions [J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2024,56(01):23-29,73.[doi:10.15986/j.1006-7930.2024.01.004]
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冻融循环条件下细粒硫酸盐渍土盐冻胀力学特性试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
56
期数:
2024年01期
页码:
23-29,73
栏目:
出版日期:
2024-02-28

文章信息/Info

Title:
Experimental study on salt frost heaving mechanical properties of fine-grained sulfate saline soil under freeze-thaw cycle conditions

文章编号:
1006-7930(2024)01-0023-07
作者:
刘海翔1; 2; 柴明霞3; 马艳霞1; 2; 高英4; 张小荣1; 2
（1.青海大学 土木工程学院，青海 西宁 810016；2.青海省建筑节能材料与工程安全重点实验室，青海 西宁 810016;
3.青海大学省部共建三江源生态与高原农牧业国家重点实验室，青海 西宁 810016；4.西安交通大学 城市学院，陕西 西安 710018）
Author(s):
102;  102); background-color: rgb(255;  255;  255); font-family: Arial;  Verdana;  sans-serif; font-size: 12pt;">LIU Haixiang1; 2; CHAI Mingxia3; MA Yanxia1; 2; GAO Ying4; ZHANG Xiaorong1; 2
（1.School of Civil Engineering, Qinghai University, Xining 810016, China;
2.Qinghai Provincial Key Laboratory of Energysaving Building Materials and Engineering Safety, Xining 810016, China;
3.State Key Laboratory of Sanjiangyuan Ecology and Plateau Agriculture and Animal Husbandry Jointly Established by
Qinghai University, Xining 810016, China；4.City College, Xi′an Jiaotong University, Xi′an 710018, China）
关键词:
细粒硫酸盐渍土; 盐冻胀力; 冻融循环; 含盐量
Keywords:
fine-grained sulfate saline soil;  salt frost heaving force;  freeze-thaw cycle;  salt content
分类号:
TU445
DOI:
10.15986/j.1006-7930.2024.01.004
文献标志码:
A
摘要:
硫酸盐渍土在失水或者温度降低的情况下会产生盐胀现象，严重影响结构物的正常使用.为研究细粒硫酸盐渍土盐冻胀力学特性，选取青海乐都公路段二十里铺区沿线硫酸盐渍土，采用自制试验箱，开展室内冻融循环试验，分析含盐量及冻融循环次数对法向盐冻胀力的影响.试验结果表明：冻融循环过程中，土中盐溶液向土体上表面迁移，同时析出的盐结晶和冰结晶使土样中硫酸钠溶液浓度增大，从而引起土体膨胀变形.压实系数为0.93、含水率为20%的细粒硫酸盐渍土盐冻胀力随着含盐量和冻融循环次数的增加而增大，盐冻胀力的增长趋势随着冻融循环次数的增加逐渐降低；在一个冻融循环周期内，按照盐冻胀力中盐胀占比及冻胀占比随温度变化的规律，将盐冻胀力变化分为四个阶段：盐胀阶段、盐冻胀耦合阶段、冻胀阶段、融化阶段，并测得含盐量为1.5%~4.0%的细粒硫酸盐渍土冻结温度在2~-5 ℃内变化，且冻结温度随着含盐量的增加而降低；盐冻胀力冻结峰值与残余值随着冻融循环次数的增加而增加，表明细粒硫酸盐渍土的盐冻胀力具有累加性，且含盐量越大累加性越强.
Abstract:
Sulfate saline soil will produce the salt swelling phenomenon in the case of water loss or temperature reduction, which seriously affects the normal use of structures. In order to study the mechanical properties of salt frost heaving of fine-grained sulfate saline soil, the sulfate saline soil along the Ershilipu area of Qinghai Ledu highway section was selected, and the indoor freeze-thaw cycle test was carried out by using the self-made test box to analyze the effects of salt content and the number of freeze-thaw cycles on the normal salt-frost heave force. The experiment results show that during the freeze-thaw cycle, the salt solution in the soil migrates to the upper surface of the soil, and the salt crystals and ice crystals precipitated at the same time increase the concentration of sodium sulfate solution in the soil sample, thus causing the soil to expand and deform. The salt frost heaving force of fine-grained sulfate saline soil with compaction coefficient of 0.93 and water content of 20% increases with the increase of salt content and freeze-thaw cycles, and the growth trend of salt frost heaving force decreases with the increase of freeze-thaw cycles. In a freeze-thaw cycle, according to the law of salt expansion ratio and frost expansion ratio changing with temperature in salt frost heave force, the change of salt frost heave force is divided into four stages : salt expansion stage, salt frost heave coupling stage, frost heave stage and melting stage. The freezing temperature of fine-grained sulfate saline soil with a salt content of 1.5%~4.0% varies from 2~5 ℃,and the freezing temperature decreases with the increase of salt content. The freezing peak value and residual value of salt frost heave force increase with the increase of freeze-thaw cycles, indicating that the salt frost heave force of fine-grained sulfate saline soil is cumulative, and the greater the salt content, the stronger the accumulation.

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备注/Memo

备注/Memo:
收稿日期:2022-10-27修回日期:2022-11-02
基金项目:青海省科技厅基础研究计划项目（2023-ZJ-756）；陕西省自然科学基础研究计划项目（2021JQ-892）
第一作者:刘海翔(1997—)，女，硕士生，主要研究细粒硫酸盐渍土盐冻胀特性.E-mail：lhx15891498958@163.com
通信作者:柴明霞(1978—)，女，硕士，副教授，主要研究无机材料.E-mail：cmxwsg@163.com
更新日期/Last Update: 2024-04-08