冻融循环条件下盐渍土路基水盐迁移及结晶规律研究

邢俊杰, 张致龙, 伊帕丽亚·阿布都维力, 刘柱, 刘广, 付庭

结构工程师 ›› 2024, Vol. 40 ›› Issue (6) : 173-180.

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PDF(1441 KB)
结构工程师 ›› 2024, Vol. 40 ›› Issue (6) : 173-180.
地基基础

冻融循环条件下盐渍土路基水盐迁移及结晶规律研究

  • 邢俊杰1, 张致龙3,*, 伊帕丽亚·阿布都维力2, 刘柱2, 刘广3, 付庭2
作者信息 +

Study on Water-Salt Migration and Crystallization Law of Saline Soil Subgrade under Freeze-Thaw Cycle Conditions

  • XING Junjie1, ZHANG Zhilong3,*, YIPALIYA·Abuduweili2, LIU Zhu2, LIU Guang3, FU Ting2
Author information +
文章历史 +

摘要

盐渍化冻土广泛分布于南疆地区,剧烈的温差以及冻融交替,使土体极易发生盐冻胀变形,尤其是焉耆盆地绿洲及边缘带地下水位较高,使盐渍土路基发生盐胀、冻胀、融沉、翻浆等病害。为模拟焉耆盆地地下水位较高且矿化度较高情况下的盐渍化冻土路基水盐迁移及盐结晶规律,结合相关焉耆盆地农二师21-24团公路工程地温及土层实测数据,建立了一个开放条件下的盐渍化冻土路基模型,通过路基温度实测数据验证了路基温度场的合理性。在此基础上,分析了开放条件下硫酸盐渍土水盐迁移聚集规律和盐分结晶情况以及氯盐渍土水盐迁移聚集规律,研究结果表明:盐分浓度升高仅延缓路基温度场的变化过程,对最终分布影响较小;氯化钠盐水盐聚集位置最大相差约0.4 m;地基初始含水率越高,水盐迁移越快。

Abstract

Saline frozen soil is widely distributed in southern Xinjiang, and the severe temperature difference and freeze-thaw alternation make the soil body prone to salt frost heave deformation, especially the high groundwater table in the oasis and edge zone of Yanqi Basin, so that salt swelling, frost heave, thaw sinking, pulp turning and other diseases occur in the saline soil roadbed. In order to simulate the salt migration and salt crystallisation law of salinized permafrost roadbed in Yanqi Basin under the condition of high water table and high mineralisation, this paper established a model of salinized permafrost roadbed under open conditions by combining the ground temperature and soil layer measurement data of the highway project of 21-24 corps of the Second Agricultural Division in the relevant Yanqi Basin, and verified the reasonableness of the temperature field of roadbed through the measured data of roadbed temperature. On this basis, the water salt migration and aggregation law and salt crystallisation of sulphate salted soil and the water salt migration and aggregation law of chloride salted soil were analysed under open conditions, and the results of the study showed that: the increase of salt concentration only retarded the process of changing the temperature field of the roadbed, and had a small influence on the final distribution; the maximum difference in the location of the water salt aggregation of sodium chloride salts was about 0.4 m; and the higher the initial water content of the foundation was, the faster the water salt migration was.

关键词

盐渍化冻土 / 水热盐耦合 / 路基 / 盐结晶量

Key words

saline frozen soil / hydrothermal salt coupling / roadbed / amount of salt crystallization

引用本文

导出引用
邢俊杰, 张致龙, 伊帕丽亚·阿布都维力, 刘柱, 刘广, 付庭. 冻融循环条件下盐渍土路基水盐迁移及结晶规律研究. 结构工程师. 2024, 40(6): 173-180
XING Junjie, ZHANG Zhilong, YIPALIYA·Abuduweili, LIU Zhu, LIU Guang, FU Ting. Study on Water-Salt Migration and Crystallization Law of Saline Soil Subgrade under Freeze-Thaw Cycle Conditions. STRUCTURAL ENGINEERS. 2024, 40(6): 173-180

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基金

自治区科技计划项目-自然科学基金(2020710004); 批准号(2020D01C025)
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