单向冻结下粉煤灰路基水-热-力耦合特性研究

doi:10.16552/j.cnki.issn1001-1625.2025.0454

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (11): 4048-4059.DOI: 10.16552/j.cnki.issn1001-1625.2025.0454

单向冻结下粉煤灰路基水-热-力耦合特性研究

惠迎新^1,2, 顾士周¹, 郭聚坤³, 郑立阳¹, 陈伟^4,5, 董旭光¹

1.宁夏大学土木与水利工程学院,银川 750021;
2.宁夏交通建设股份有限公司,银川 750021;
3.山东交通职业学院公路与建筑系,潍坊 261206;
4.新疆交通建设集团股份有限公司,乌鲁木齐 830000;
5.新疆交建规划勘察设计有限公司,乌鲁木齐 830000

收稿日期:2025-04-30 修订日期:2025-07-07 出版日期:2025-11-15 发布日期:2025-12-04
通信作者: 郭聚坤,博士,副教授。E-mail:gjk_1986@126.com
作者简介:惠迎新(1985—),男,博士,教授。主要从事固废资源利用方面的研究。E-mail:huiyx@seu.edu.cn
基金资助:
丝绸之路经济带创新驱动发展试验区、乌昌石国家自主创新示范区科技发展计划(2023LQ03002);宁东能源化工基地本级重点支持领域科技项目(20250301NDKJ020)

Thermo-Hydro-Mechanical Coupling Characteristics of Fly Ash Subgrade in Condition of Unidirectional Freezing

HUI Yingxin^1,2, GU Shizhou¹, GUO Jukun³, ZHENG Liyang¹, CHEN Wei^4,5, DONG Xuguang¹

1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China;
2. Ningxia Communications Construction Co., Ltd., Yinchuan 750021, China;
3. School of Highway and Architecture, Shandong Transport Vocational College, Weifang 261206, China;
4. Xinjiang Communications Construction Group Co., Urumqi 830000, China;
5. Xinjiang Transportation Construction Planning Survey and Design Co., Ltd., Urumqi 830000, China

Received:2025-04-30 Revised:2025-07-07 Published:2025-11-15 Online:2025-12-04

摘要/Abstract

摘要： 冻胀是造成季冻区路基破坏的一项重要诱因,为了研究粉煤灰路基在季冻地区服役内部温度、含水率和冻胀力的变化,本文利用自主研发的一维土柱固结试验设备开展粉煤灰柱单向冻结试验,并建立粉煤灰路基的水-热-力(THM)耦合模型,分析冻结过程中粉煤灰柱内部水分、温度迁移规律及冻胀力变化特征。结果表明:粉煤灰路基内部温度变化可按降温速率分为快速冻结、过渡冻结和稳定冻结三个阶段;冻结锋面随冻结时间不断下移,水分在冻结锋面处产生突变;通过有限元软件有效模拟了试验中的冻胀量变化及温度和水分的传递过程,并将试样划分为冻结区、正冻区和未冻区,试验结束后正冻区的范围明显增大,冻结区的范围逐渐趋于稳定;以冻结过程中路基含冰量来表征冻结对路基的损伤效应,发现路基损伤主要分布于路基表面,越接近路基内部,损伤程度越小。本文模拟了粉煤灰路基在季冻区长期服役的冻胀量变化,并解释了内部含水率与温度相互作用的机理。

关键词: 季节性冻土, 粉煤灰, 一维土柱, 单向冻结, 水-热-力耦合, 含冰量

Abstract: Frost heave is a key factor contributing to subgrade damage in seasonally frozen regions. To investigate the changes of internal temperature, water content and frost heave force of fly ash subgrade in seasonally frozen areas, the one-dimensional soil column consolidation test equipment developed independently was used to carry out the unidirectional freezing test of fly ash column. A thermo-hydro-mechanical (THM) coupling model for fly ash subgrade was established to analyze the migration patterns of water and temperature, inside fly ash column and the change characteristics of frost heave force during the freezing process. The results show that the internal temperature changes of fly ash subgrade can be divided into three stages based on the cooling rate: rapid freezing, transitional freezing and steady freezing. As freezing time increases, the freezing front progressively descends, and a sharp water variation occurs at freezing front. Finite element software simulations effectively simulate the frost heave displacement and the transfer processes of temperature and water observed in the test. The specimen is divided into frozen zone, actively freezing zone and unfrozen zone. By the end of the test, the actively freezing zone significantly expands, while the frozen zone gradually stabilizes. The damage to the subgrade is characterized by the ice content during freezing process, showing that damage is primarily concentrated at the surface of the subgrade, and the closer to the interior of the subgrade, the smaller the damage degree. In this paper, the change of frost heave displacement of fly ash subgrade in long-term service in seasonal frozen area is simulated, and the mechanism of interaction between internal water content and temperature is explained.

Key words: seasonally frozen soil, fly ash, one-dimensional soil column, unidirectional freezing, thermo-hydro-mechanical (THM) coupling, ice content

中图分类号:

U416

惠迎新, 顾士周, 郭聚坤, 郑立阳, 陈伟, 董旭光. 单向冻结下粉煤灰路基水-热-力耦合特性研究[J]. 硅酸盐通报, 2025, 44(11): 4048-4059.

HUI Yingxin, GU Shizhou, GUO Jukun, ZHENG Liyang, CHEN Wei, DONG Xuguang. Thermo-Hydro-Mechanical Coupling Characteristics of Fly Ash Subgrade in Condition of Unidirectional Freezing[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4048-4059.

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单向冻结下粉煤灰路基水-热-力耦合特性研究

Thermo-Hydro-Mechanical Coupling Characteristics of Fly Ash Subgrade in Condition of Unidirectional Freezing

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