[1]吴 鄂,李明俐*,张丰述,等.藏南地区冰碛土在冻融循环下动力特性劣化规律[J].山地学报,2025,(5):709-722.[doi:10.16089/j.cnki.1008-2786.000924]
　WU E,,et al.Degradation Law of Dynamic Properties of Glacial Till in Southern Xizang of China under Freeze-Thaw Cycles[J].Mountain Research,2025,(5):709-722.[doi:10.16089/j.cnki.1008-2786.000924]
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藏南地区冰碛土在冻融循环下动力特性劣化规律()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2025年第5期
页码:
709-722
栏目:
山地灾害
出版日期:
2025-12-30

文章信息/Info

Title:
Degradation Law of Dynamic Properties of Glacial Till in Southern Xizang of China under Freeze-Thaw Cycles
文章编号:
1008-2786-(2025)5-709-14
作者:
吴 鄂1; 2; 3; 李明俐4*; 张丰述1; 2; 3; 杨 帆5; 6; 王纳纳1; 2; 3
(1. 四川省地质环境调查研究中心,成都 610036; 2. 四川省九一五建设集团有限公司,成都 620020; 3. 四川省地质灾害防治工程技术研究中心,成都 610036; 4. 成都理工大学 地质灾害与环境保护国家重点实验室,成都 610054
Author(s):
WU E1;  2;  3;  LI Mingli4*;  ZHANG Fengshu1;  2;  3;  YANG Fan5;  6;  WANG Nana1;  2;  3
(1. Sichuan Geological Environment Survey and Research Center, Chengdu 610036, China; 2. Sichuan 915 Construction Group CO., LTD., Chengdu 620020, China; 3. Sichuan Province Engineering Technology Research Center of Geohazard Prevention, Chengdu 610036, China; 4. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610054, China; 5. Institute of Sichuan Metal Geology Survey, Chengdu 611700, China; 6. Sichuan Shushui Geological Environment Research CO., LTD., Chengdu 611700, China)
关键词:
冰碛土;  冻融-动载耦合;  动力参数劣化;  滞回特性;  阻尼比
Keywords:
glacial moraine;  freeze-thaw and dynamic loading coupling;  dynamic parameter degradation;  hysteresis behavior;  damping ratio
分类号:
TU41
DOI:
10.16089/j.cnki.1008-2786.000924
文献标志码:
A
摘要:
冻融循环与动荷载的耦合作用导致冰碛土动力特性持续劣化,严重威胁寒区交通基础设施的长期稳定性,但其耦合损伤机制尚未明晰。本研究以青藏高原藏南奴觉沟典型冰碛堤为对象,通过控制排水条件模拟天然冻融过程,对表层土与30 cm深度冰碛土开展冻融-动三轴耦合试验,系统揭示冻融循环次数(N=0～10)与动荷载共同作用下土体动力参数的演化规律。主要结论如下:(1)动应力-动应变滞回曲线呈非对称塑性主导特征,表现出显著滞后性、非线性及应变累积效应,土体结构损伤持续累积35%,变形抵抗能力衰减速率达-10%/kPa。(2)冻融前期(N≤5)动力参数劣化最为剧烈。冻融5次循环后,动弹性模量(Ed)与动剪切模量(Gd)分别衰减21%和30%,当循环至N=10时,Ed损伤率高达90.81%,土体已无法有效抵抗变形。(3)阻尼比(λ)在20次冻融后累计降幅达25.21%,其衰减速率由初期的每周期2.85%降至后期的每周期0.24%,表明土体通过颗粒摩擦耗散振动能量的能力持续衰退,导致更多能量转化为结构破坏功。研究成果可为青藏高原高寒区抗震工程设计和地质灾害监测预警提供关键参数依据。
Abstract:
The coupling effect of freeze-thaw cycles and dynamic loading leads to continuous degradation of the dynamic properties of glacial till, posing a serious threat to the long-term stability of transportation infrastructure in cold regions of China. However, the underlying coupled damage mechanism remains unclear.
This study investigated typical glacial moraine deposits from the Nujuego Gully in southern Qinghai-Tibet Plateau. By simulating natural freeze-thaw processes under controlled drainage conditions, coupled freeze-thaw and dynamic triaxial tests were conducted on surface and 30 cm deep glacial till samples to systematically reveal the evolution of soil dynamic parameters under varying numbers of freeze-thaw cycles(N=0-10)combined with dynamic loading. The main findings are as follows:
(1)The dynamic stress-strain hysteresis loops exhibited an asymmetric, plasticity-dominated behavior, characterized by significant hysteresis, nonlinearity, and strain accumulation, the continuous accumulation of soil structure damage has reached 35%, and the rate of decline in deformation resistance capacity has reached -10%/kPa.
(2)The most drastic deterioration of dynamic parameters occurred during the early freeze-thaw stages(N≤5). After 5 freeze-thaw cycles, the dynamic elastic modulus(Ed)and the dynamic shear modulus(Gd)damped by 21% and 30%, respectively. When the number of cycles reached N=10, the damage level of Ed reached as high as 90.81%, indicating that the soil had lost its ability to effectively resist deformation.
(3)The damping ratio(λ)accumulated a total reduction of 25.21% after 20 freeze-thaw cycles, with its decay rate decreasing from an initial 2.85% per cycle to 0.24% per cycle in later stages, indicating a sustained decline in the soil's ability to dissipate vibrational energy through particle friction — resulting in more energy being converted into structural damage work.
These findings provide essential parameter support for seismic engineering design and geological hazard monitoring and early warning systems in the alpine regions of the Qinghai-Tibet Plateau.

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相似文献/References:

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备注/Memo

备注/Memo:
收稿日期(Received date): 2025- 05- 08; 改回日期(Accepted date):2025- 09-19
基金项目(Foundation item): 四川省科技计划(2025YFNH0008)。[Sichuan Provincial Science and Technology Plan Funding(2025YFNH0008 )]
作者简介(Biography): 吴鄂(1983-),男,硕士,高级工程师,主要研究方向:地质灾害。 [WU E(1983-), male, M.Sc., senior engineer, research on geological disasters] E-mail: 645991204@qq.com
更新日期/Last Update: 2025-10-20