Study on creep constitutive model of loess considering hardening and damage effects

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-09-03 DOI:10.1007/s10064-025-04457-y

Nan Yang, Yahong Deng, Li Li, Huandong Mu

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Abstract

Creep deformation of loess will directly affect the long-term safety and stability of loess engineering. The creep deformation characteristics of loess under different confining pressures and loading levels were investigated by performing graded loading and unloading triaxial creep tests in order to study the creep characteristics of loess in depth. Test results show that under similar loading conditions, higher confining pressure reduces creep. Only decelerated creep occurs in loess at low and medium stress. Decelerated, steady, and accelerated creep occur in loess at high stress. The creep mechanism of loess was analysed according to the mechanical response characteristics of loess to creep loading and the microstructural evolution characteristics of typical loess creep. The creep mechanism of loess is that the creep of loess is a result of the combined effect of compression hardening and structural damage. Finally, based on Norton's creep power law and continuous damage mechanics, a new loess creep constitutive model considering hardening and damage effects is proposed. The validity and reasonability of the proposed model is verified by fitting the theoretical model to the creep test data. The research results contribute to a better understanding of the creep properties of loess. They are of great practical value for solving loess rheological problems in practical engineering.

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考虑硬化和损伤效应的黄土蠕变本构模型研究

黄土的蠕变变形直接影响到黄土工程的长期安全稳定。为深入研究黄土的蠕变特性，通过分级加卸载三轴蠕变试验，研究了不同围压和加载水平下黄土的蠕变变形特征。试验结果表明，在相同的加载条件下，较高的围压可以减小蠕变。在中、低应力条件下，黄土只发生减速蠕变。黄土在高应力作用下发生减速、稳定和加速蠕变。根据黄土对蠕变荷载的力学响应特征和典型黄土蠕变的细观结构演化特征，分析了黄土的蠕变机理。黄土的蠕变机理是黄土的蠕变是压缩硬化和结构损伤共同作用的结果。最后，基于诺顿蠕变幂定律和连续损伤力学，提出了考虑硬化和损伤效应的黄土蠕变本构模型。通过将理论模型与蠕变试验数据进行拟合，验证了该模型的有效性和合理性。研究结果有助于更好地理解黄土的蠕变特性。对解决实际工程中的黄土流变问题具有重要的实用价值。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.