黏土与固化土冻胀融沉试验研究  

EXPERIMENTAL STUDY ON FREEZE-THAW BEHAVIOR OF CLAY AND STABILIZED SOIL

作　　者：张正 吴葵 马涛 张扬三 马晓旭 张会梅 ZHANG Zheng;WU Kui;MA Tao;ZHANG Yangsan;MA Xiaoxu;ZHANG Huimei(Ningxia Water Conservancy and Hydropower Engineering Bureau Co.,Ltd.,Yinchuan 750004,China;China Institute of Water Resources and Hydropower Research,Key Laboratory of Engineering Materials of Ministry of Water Resources,Beijing 100038,China;Beijing IWHR-KHL Co.,Ltd.,Beijing 100038,China)

机构地区：[1]宁夏水利水电工程局有限公司,银川750004 [2]中国水利水电科学研究院,水利部水工程材料重点实验室,北京100038 [3]北京中水科海利工程技术有限公司,北京100038

出　　处：《低温建筑技术》2024年第9期69-72,共4页Low Temperature Architecture Technology

基　　金：宁夏回族自治区重点研发计划(2022BEG03057);宁夏水利水电工程局有限公司科研项目“严寒地区渠道防渗防冻胀材料与措施研究”。

摘　　要：为降低渠道土体的冻胀融沉变形,减少渠道衬砌混凝土开裂,文中采用自制试验装置研究了宁夏黏土和水泥固化土冻融过程的温度、变形规律,并测试了多循环冻融变形曲线。结果表明黏土冻融变形经历了6个阶段:快速冻胀、降温收缩、冻胀稳定、升温膨胀、缓慢融沉和融沉稳定,验证了冰融化过程存在温度平台。经历多次冻融,黏土累积膨胀量随着冻融次数增加呈线性增加的趋势。固化土表现为冻缩融胀,变形幅度较小,多次冻融后累积变形基本为零。因此,若采用水泥固化土部分替换黏土,将有效减小渠道的冻胀融沉变形,有利于混凝土衬砌的结构防裂。To reduce frost heave and thaw settlement deformations in channel soils and minimize cracking in channel lining concrete,this study uses a custom experimental setup to investigate the temperature and deformation patterns of Ningxia clay and cement-stabilized soil during freeze-thaw cycles,and measures deformation curves across multiple freeze-thaw cycles.The results show that clay undergoes six stages of freeze-thaw deformation:rapid heave,cooling shrinkage,stable heave,warming expansion,slow thaw settlement,and stable settlement,confirming a temperature plateau during ice melting.With multiple freeze-thaw cycles,the cumulative heave of clay increases linearly with the number of cycles.In contrast,cement-stabilized soil exhibits frost shrinkage and thaw expansion with minimal deformation,and cumulative deformation is nearly zero after several cycles.Therefore,replacing part of the clay with cement-stabilized soil can effectively reduce freeze-thaw deformation in channels and benefit the structural crack resistance of concrete linings.

关 键 词：水泥固化土 冻胀融沉 渠道衬砌 黏土冻融变形 

分 类 号：TU411[建筑科学—岩土工程]