西北地质2026，Vol.59Issue(2)：72-82,11.DOI:10.12401/j.nwg.2025140
冻融-湿干循环作用下伊犁重塑黄土力学特性劣化及本构模型研究
Study on the Deterioration of Mechanical Properties and Constitutive Model of Ili Remolded Loess under Freeze Thaw Wetting Drying Cycles
摘要
Abstract
As the core node of the"belt and road"Central Asia land route,the engineering geological stability of Ili region in Xinjiang is crucial to regional development.The mechanical properties of Quaternary loess,which is widely distributed in the region,are continuously deteriorated under the complex climatic conditions such as seasonal freeze-thaw,dry wet cycle,heavy rainfall and the continuous effect of engineering activities,thus inducing frequent regional loess landslides.Therefore,it is of practical significance to further study the ef-fect of freeze-thaw-wetting-drying(FTWD)cycle on the mechanical properties and nonlinear degradation law of Ili remolded loess.Based on the consolidated undrained triaxial shear test and microscopic test under FTWD cy-cle,the stress-strain response,strength parameter evolution and damage mechanism were revealed from the macro and micro scale.On this basis,assuming that the micro element strength of loess obeys the Log-logistic distribution function,the damage model of loess is established and its applicability is verified.The results showed that the shear strength decreased by 22.9％with the increase of the number of cycles,and the cohesion attenuation(45.2％)was significantly higher than the internal friction angle(7.27％).In the microscopic image,it can be seen that the compacted loess presents the characteristics of aggregate structure.The deviatoric stress-strain relationship curve of Ili loess sample is mainly strain hardening type.The cohesion of Ili loess decreases significantly with the increase of FTWD cycles,while the internal friction angle changes slightly.Combining the traditional Duncan-Chang model with the statistical damage theory,a constitutive model which can uniformly characterize the strain hardening and strain softening characteristics under different FTWD cycles is established,and the model parameters are solved.The model verification shows that it has good predictability for the test re-sults under different confining pressures and cycles.关键词
伊犁黄土/冻融-湿干循环/力学特性/Log-logistic分布/损伤模型Key words
Ili loess/freeze-thaw-wetting-drying cycle/mechanical properties/log-logistic distribution/damage model分类
天文与地球科学引用本文复制引用
黄翀垚,蹇永明,张智勇,李栓宁,段方伟,张冲,岳宗鹏..冻融-湿干循环作用下伊犁重塑黄土力学特性劣化及本构模型研究[J].西北地质,2026,59(2):72-82,11.基金项目
中交第二公路工程局有限公司重点科技项目(2020X-1-20),陕西省自然科学基础研究计划面上项目(2021JM-180)联合资助. （2020X-1-20）
