考虑温度效应的冻结膨胀土统计损伤模型

doi:10.13229/j.cnki.jdxbgxb.20211151

吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (8): 2339-2349.doi: 10.13229/j.cnki.jdxbgxb.20211151

• 交通运输工程·土木工程 • 上一篇

考虑温度效应的冻结膨胀土统计损伤模型

李新宇^1,^2,³(),凌贤长^1,^2,³(),曲娜¹

^1.哈尔滨工业大学土木工程学院，哈尔滨 150090
^2.哈尔滨工业大学重庆研究院，重庆 401135
^3.哈尔滨工业大学黑龙江省寒区轨道交通工程技术研究中心，哈尔滨 150090

收稿日期:2021-11-02 出版日期:2023-08-01 发布日期:2023-08-21
通讯作者: 凌贤长 E-mail:18B933025@stu.hit.edu.cn;lingxianzhang@hit.edu.cn
作者简介:李新宇（1991-），女，博士研究生.研究方向：寒区冻土工程和特殊岩土工程.E-mail：18B933025@stu.hit.edu.cn
基金资助:
国家自然科学基金项目(42101125);中国博士后科学基金面上项目(2021M690840)

Statistical damage model of frozen expansive soil considering temperature effect

Xin-yu LI^1,^2,³(),Xian-zhang LING^1,^2,³(),Na QU¹

^1.School of Civil Engineering，Harbin Institute of Technology，Harbin 150090，China
^2.Chongqing Research Institute，Harbin Institute of Technology，Chongqing 401135，China
^3.Heilongjiang Research Center for Rail Transit Engineering in Cold Regions，Harbin Institute of Technology，Harbin 150090，China

Received:2021-11-02 Online:2023-08-01 Published:2023-08-21
Contact: Xian-zhang LING E-mail:18B933025@stu.hit.edu.cn;lingxianzhang@hit.edu.cn

摘要/Abstract

摘要：

为研究高寒深季节冻土区膨胀土的低温力学特性，开展考虑试验温度、含水率和冻融循环次数影响的低围压固结不排水剪切试验。结果表明：温度和含水率的降低均会使冻结膨胀土的偏应力-轴应变曲线类型由硬化型逐渐向软化型改变；冻融循环作用会加剧软化效应，同时促进围压对试样的敏感度；试验温度在已冻结区温度范围内时冻结膨胀土剪切过程可依次分为4个阶段：弹性阶段、塑性剪缩阶段、塑性剪胀阶段和破坏阶段；冻结膨胀土的弹性模量随试验温度的降低而线性增大。建立了考虑温度影响的低温冻结膨胀土统计损伤模型，揭示了冻结膨胀土宏观力学特性劣化规律。

关键词: 冻结膨胀土, 弹性模量, 应力-应变关系, 损伤阈值, 统计损伤模型

Abstract:

In order to study the low temperature mechanical properties of expansive soil in the alpine deep seasonal permafrost region， the consolidation undrained shear tests under low confining pressure in different freezing temperatures， moisture content and freeze-thaw cycles were carried out. The results show that the stress-strain curves of the frozen expansive soil change from hardening to softening with the decrease of freezing temperature and initial water content. The effect of freeze-thaw cycles intensifies the softening effect and promotes the sensitivity of confining pressure. When the freezing temperature is within the frozen zone， the shear process of frozen expansive soil can be divided into four stages with the increase of axial strain： elastic stage， plastic shear shrinkage stage， plastic dilatancy stage and failure stage. The elastic modulus of frozen expansive soil increases with decreasing temperature and presents a good linear correlation. The statistical damage model of frozen expansive soil considering the influence of temperature was deduced， and the law of macroscopic mechanical properties deterioration of frozen expansive soil was revealed.

Key words: frozen expansive soil, elastic modulus, stress-strain relation, damage threshold, statistical damage model

中图分类号:

TU443

李新宇,凌贤长,曲娜. 考虑温度效应的冻结膨胀土统计损伤模型[J]. 吉林大学学报(工学版), 2023, 53(8): 2339-2349.

Xin-yu LI,Xian-zhang LING,Na QU. Statistical damage model of frozen expansive soil considering temperature effect[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(8): 2339-2349.

图/表 13

表1

图1

图2

图3

图4

图5

图6

图7

图8

图9

表2

冻结膨胀土统计损伤模型参数"

温度/℃	围压/kPa	$α$	m	F₀
-4	30	0.19	0.43	1048.36
	45		0.53	1577.71
	60		0.43	1313.84
-7	30	0.19	0.36	686.85
	45		0.39	1002.69
	60		0.40	1162.08
-10	30	0.20	0.33	817.41
	45		0.35	993.12
	60		0.33	890.87

表2

图10

图11

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考虑温度效应的冻结膨胀土统计损伤模型

Statistical damage model of frozen expansive soil considering temperature effect

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参考文献 27

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试样编号	试验温度/℃	含水率/%	冻融循环次数	围压/kPa
1#	-1	21	0	30
2#	-4	21	0	30
3#	-7	21	0	30
4#	-10	21	0	30
5#	-1	21	0	45
6#	-4	21	0	45
7#	-7	21	0	45
8#	-10	21	0	45
9#	-1	21	0	60
10#	-4	21	0	60
11#	-7	21	0	60
12#	-10	21	0	60
13#	-4	18	0	45
14#	-4	24	0	45
15#	-4	21	10	30
16#	-4	21	10	45
17#	-4	21	10	60
18#	20	21	0	30
19#	20	21	0	60
20#	20	21	0	90
21#	-4	21	0	150
22#	-4	21	0	250

试样编号	试验温度/℃	含水率/%	冻融循环次数	围压/kPa
1#	-1	21	0	30
2#	-4	21	0	30
3#	-7	21	0	30
4#	-10	21	0	30
5#	-1	21	0	45
6#	-4	21	0	45
7#	-7	21	0	45
8#	-10	21	0	45
9#	-1	21	0	60
10#	-4	21	0	60
11#	-7	21	0	60
12#	-10	21	0	60
13#	-4	18	0	45
14#	-4	24	0	45
15#	-4	21	10	30
16#	-4	21	10	45
17#	-4	21	10	60
18#	20	21	0	30
19#	20	21	0	60
20#	20	21	0	90
21#	-4	21	0	150
22#	-4	21	0	250

试样编号	试验温度/℃	含水率/%	冻融循环次数	围压/kPa
1#	-1	21	0	30
2#	-4	21	0	30
3#	-7	21	0	30
4#	-10	21	0	30
5#	-1	21	0	45
6#	-4	21	0	45
7#	-7	21	0	45
8#	-10	21	0	45
9#	-1	21	0	60
10#	-4	21	0	60
11#	-7	21	0	60
12#	-10	21	0	60
13#	-4	18	0	45
14#	-4	24	0	45
15#	-4	21	10	30
16#	-4	21	10	45
17#	-4	21	10	60
18#	20	21	0	30
19#	20	21	0	60
20#	20	21	0	90
21#	-4	21	0	150
22#	-4	21	0	250