带围压冻融循环下滨海重塑软土力学特性试验研究

doi:10.16285/j.rsm.2022.1211

岩土力学 ›› 2023, Vol. 44 ›› Issue (7): 1863-1874.doi: 10.16285/j.rsm.2022.1211

• 基础理论与实验研究 • 下一篇

带围压冻融循环下滨海重塑软土力学特性试验研究

张建新^{1, 2}，马昌虎²，郎瑞卿^{1, 2}，孙立强³，杨爱武⁴，李迪²

1. 天津城建大学天津市软土特性与工程环境重点实验室，天津 300384；2. 天津城建大学土木工程学院，天津 300384； 3. 天津大学建筑工程学院，天津 300072；4. 东华大学环境科学与工程学院，上海 201620

收稿日期:2022-08-05 接受日期:2023-01-08 出版日期:2023-07-17 发布日期:2023-07-16
通讯作者: 郎瑞卿，男，1991年生，博士，副教授，主要从事地基处理等方面的教学与研究。E-mail: tculrq@163.com E-mail:zh-jianxin@126.com
作者简介:张建新，男，1966年生，博士，教授，主要从事城市地下工程方面的教学与研究。
基金资助:
国家自然科学基金（No.52008286，No.52078336）；天津市研究生科研创新项目（No.2021YJSS345）

Experimental study on mechanical properties of coastal remolded soft soil subjected to the freeze-thaw cycle under confining pressure

ZHANG Jian-xin^{1, 2}, MA Chang-hu², LANG Rui-qing^{1, 2}, SUN Li-qiang³, YANG Ai-wu⁴, LI Di²

1. Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin, Tianjin Chengjian University, Tianjin 300384, China; 2. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China; 3. School of Civil Engineering, Tianjin University, Tianjin 300372, China; 4. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China

Received:2022-08-05 Accepted:2023-01-08 Online:2023-07-17 Published:2023-07-16
Supported by:
This work was supported by the National Natural Science Foundation of China (52008286, 52078336) and Tianjin Postgraduate Scientific Research Innovation Project (2021YJSS345).

摘要/Abstract

摘要： 滨海软土地区人工冻结工程中土体通常在一定围压下受到冻融作用进而力学性能发生改变，因此开展带围压冻融作用下土体力学特性研究具有重要意义。以天津滨海地区典型淤泥质土为研究对象，通过自主改进的温控应力路径仪，对比分析了常规无围压冻融和带围压冻融下淤泥质土力学特性差异，揭示了冻融围压、冷端温度、冻融循环次数对其超孔隙水压力、应力−应变曲线、强度及变形指标的影响，并通过电镜扫描试验揭示了冻融围压对其力学特性的影响机制。在此基础之上，采用指数函数建立了淤泥质土冻融循环作用下抗剪强度和弹性模量折减系数与上述因素的关系。结果表明：冻融围压降低了冻融后土体内孔隙大小和数量，能够在一定程度上减弱冻融对土体结构的破坏，但对其应力−应变曲线模式影响较小；随着冷端温度的降低和冻融循环次数的增加，冻融后土体强度和模量均大幅度降低；超孔隙水压力随冻融围压和冷端温度的升高及冻融次数的降低而降低。

关键词: 冻融围压, 冻融循环, 应力?应变关系, 冷端温度

Abstract: Mechanical properties of soft soil will change under freeze-thaw cycle with a certain confining pressure in artificial freezing engineering in coastal soft soil area. Therefore, it is of a great significance to study the influence of freeze-thaw cycle under different confining pressures on the mechanical properties of soft soil. This paper takes the typical muddy soil in Tianjin coastal area as the research object. Through a self-improved temperature controlled triaxial apparatus, the differences of mechanical properties of soft soil under conventional freeze-thaw without confining pressure and freeze-thaw with confining pressure are compared and analyzed. Furthermore, the effects of freezing temperature, number of freeze-thaw cycles and freezing-thawing confining pressure on excess pore pressure, stress-strain characteristics, strength and deformation index of soft soil are revealed. The influence mechanism of freeze-thaw confining pressure on the mechanical properties is explored by SEM. Then, the relationship of shear strength, reduction coefficient of elastic modulus of muddy soil and above influence factors is established by using an exponential function. The results show that the freezing and thawing confining pressure reduces the size and number of pores in the soil after freezing and thawing, which can weaken the damage of freezing and thawing to the soil structure to a certain extent. However, the freeze-thaw confining pressure has little effect on the stress-strain curve. With the decrease of freezing temperature and the increase of the number of freeze-thaw cycles, the strength and moduli of soil are greatly reduced. With the increase of freezing-thawing confining pressure, the freezing temperature and the decrease of the number of freeze-thaw cycles, the excess pore pressure decreases.

Key words: freezing-thawing confining pressure, freeze-thaw cycles, stress-strain characteristics, freezing temperature

中图分类号:

TU447

张建新, 马昌虎, 郎瑞卿, 孙立强, 杨爱武, 李迪, . 带围压冻融循环下滨海重塑软土力学特性试验研究[J]. 岩土力学, 2023, 44(7): 1863-1874.

ZHANG Jian-xin, MA Chang-hu, LANG Rui-qing, SUN Li-qiang, YANG Ai-wu, LI Di, . Experimental study on mechanical properties of coastal remolded soft soil subjected to the freeze-thaw cycle under confining pressure[J]. Rock and Soil Mechanics, 2023, 44(7): 1863-1874.

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带围压冻融循环下滨海重塑软土力学特性试验研究

Experimental study on mechanical properties of coastal remolded soft soil subjected to the freeze-thaw cycle under confining pressure

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