工程地质学报2024，Vol.32Issue(3)：800-810,11.DOI:10.13544/j.cnki.jeg.2023-0255
冻融循环下罗布泊盐渍土的累积变形特性研究
ACCUMULATIVE DEFORMATION CHARACTERISTICS OF SALINE SOILS IN LOP NUR UNDER FREEZE-THAW CYCLES
摘要
Abstract
The accumulative deformation characteristics of soils are crucial for designing subgrade structures and maintaining the long-term dynamic stability of the subgrade.Due to the effects of freeze-thaw cycles in saline soil re-gions,liquid soluble salt solutions and solid crystalline salt particles undergo crystallization-dissolution and salt ac-cumulation-desalination.These processes not only cause changes in soil structure and physical properties but also influence the dynamic properties of saline soil.Based on freeze-thaw cycle tests,dynamic triaxial tests with different dynamic stress levels were conducted to study the accumulative deformation characteristics of saline soils in the Lop Nur region under the dynamic load of railway.Criteria for plastic behavior and a prediction model of accumulated plastic strain were established.The results show that accumulative deformation increases with both the number of freeze-thaw cycles and the increase in dynamic stress level.Under the simulated dynamic load of railway,the accu-mulative deformation behavior of saline soil in the study area is mainly characterized by plastic shakedown and plastic creep phases.The relationship between the accumulated plastic strain rate of saline soil and the number of loading cy-cles can be well described by a power function.Based on this,an accumulated plastic strain model considering freeze-thaw cycles and dynamic stress is proposed.These research results can provide references for settlement prediction and dynamic stability evaluation of saline soil subgrades under freeze-thaw effects and cyclic dynamic loads.关键词
盐渍土/动三轴试验/冻融循环/累积变形Key words
Saline soil/Dynamic triaxial test/Freeze-thaw cycle/Accumulative deformation分类
天文与地球科学引用本文复制引用
廖昕,范茂基,陈治良,白净钞,朱磊,杨丹..冻融循环下罗布泊盐渍土的累积变形特性研究[J].工程地质学报,2024,32(3):800-810,11.基金项目
国家自然科学基金项目(资助号:42090051),四川省重点研发项目(资助号:2022YFWZ0009),四川省自然科学基金青年学者(资助号:2022NSFSC1117).感谢西南交通大学分析测试中心提供动三轴试验测试与西南交通大学地质工程与测绘工程创新实践基地(YJG-2022-JD04)的大力支持.This research is supported by the National Natural Science Foundation of China(Grant No.42090051),Key R&D Program of Sichuan(Grant No.2022YFWZ0009)and Natural Science Foundation of Sichuan Province for Young Scholars(Grant No.2022NSFSC1117). （资助号:42090051）
