1.北京建筑大学 土木与交通工程学院,北京,100044
2.北京工业大学 城市与工程安全减灾教育部重点试验室,北京,100124
梁靖宇(1988-),男,博士,副研究员,主要从事冻土工程特性及其本构模型的研究。E-mail: liangjy@bucea.edu.cn
路德春(1977-),男,博士,教授,主要从事岩土塑性力学与城市地下工程研究。E-mail: dechun@bjut.edu.cn
收稿:2025-11-03,
网络首发:2026-04-20,
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梁靖宇, 胡晓霞, 何林泓, 等. 冻土单轴力学行为的温度与应变率效应及本构关系研究[J/OL]. 防灾减灾工程学报, 2026,1-13.
LIANG Jingyu, HU Xiaoxiao, HE Linhong, et al. Study on Temperature‑Strain Rate Effects and Constitutive Relationship of Frozen Soil under Uniaxial Mechanical Behavior[J/OL]. Journal of Disaster Prevention and Mitigation Engineering, 2026, 1-13.
梁靖宇, 胡晓霞, 何林泓, 等. 冻土单轴力学行为的温度与应变率效应及本构关系研究[J/OL]. 防灾减灾工程学报, 2026,1-13. DOI: 10.13409/j.cnki.jdpme.20251103001.
LIANG Jingyu, HU Xiaoxiao, HE Linhong, et al. Study on Temperature‑Strain Rate Effects and Constitutive Relationship of Frozen Soil under Uniaxial Mechanical Behavior[J/OL]. Journal of Disaster Prevention and Mitigation Engineering, 2026, 1-13. DOI: 10.13409/j.cnki.jdpme.20251103001.
冻土作为一种由土颗粒、冰、水及气体组成的多相复合岩土材料,其单轴力学行为具有显著的温度和应变率敏感性。本研究通过开展12组不同温度(-5 ℃、-10 ℃、-15 ℃、-20 ℃)和应变率(10
-3
s
-1
、10
-4
s
-1
、10
-5
s
-1
)组合条件下的冻土单轴压缩试验,系统分析了冻土单轴力学特性演化规律,包括温度条件降低与应变率条件增大导致的强度提升与延性变形骤降的变形规律,以及峰值应力、峰值应变以及残余应力受温度-应变率耦合作用的显著调控。针对温度-应变率耦合行为建模难题,基于平移变换应引入了三向抗拉强度
σ
T
,推导了黏聚效应修正的剑桥模型应变硬化表达式,并类比构建了冻土的单轴压缩应变硬化表达式。通过构建潜在单轴抗压强度的应变驱动劣化函数,获得了能够描述不同温度与应变率条件下冻土单轴压缩力学行为的应变硬化/软化特征的本构关系。结合温度-应变率相关试验结果分析确定了5个模型参数,并进行了试验验证。结果表明,该模型能有效捕捉温度与应变率耦合影响下的冻土力学响应,为冻土力学相关工程的设计与分析提供理论支撑。
Frozen soil
as a multiphase geomaterial composed of soil particles
ice
unfrozen water
and air
exhibits pronounced temperature and strain rate dependence on its uniaxial mechanical behavior. This study conducted uniaxial compression tests under 12 combinations of temperatures (-5 ℃
-10 ℃
-15 ℃
-20 ℃) and strain rates (10
-3
s
-1
10
-4
s
-1
10
-5
s
-1
)
systematically revealing the evolution of mechanical behavior
including strength enhancement and ductility reduction with decreasing temperature or increasing strain rate
along with significant coupling effects of temperature-strain rate on peak stress
peak strain
and residual stress. To address the challenge in modeling the coupling behavior of temperature and strain rate
the transformed stress incorporating the triaxial tensile strength (
σ
T
) is adopted to derive the strain hardening expression based on the Cambridge model incorporating the cohesive effect. This expression is analogously extended to formulate a uniaxial compressive hardening expression. Furthermore
a strain-driven degradation function for potential compressive strength is proposed to complete the uniaxial constitutive relationship for frozen soil. Five parameters of the model were determined by analyzing the experimental rules relating to temperature and strain rate
and model verification was also conducted. The results demonstrate that the model effectively captures the mechanical response of frozen soils under the coupled effects of temperature and strain rate
thereby providing a theoretical basis for the design and analysis of engineering projects involving frozen soils.
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