长江科学院院报2023，Vol.40Issue(12)：147-153,7.DOI:10.11988/ckyyb.20220713
循环荷载作用下土石混填料的蠕变模型研究
Creep Modeling of Soil-Rock Mixed Fill under Cyclic Loading
摘要
Abstract
To investigate the cumulative deformation characteristics of soil-rock mixed fill under cyclic loading,a comprehensive large dynamic triaxial test was conducted.The objective was to determine the influence of different dynamic stress amplitudes and confining pressures on the axial cumulative strain of the fill,as well as the variation of dynamic pore water pressure.Additionally,a cumulative strain prediction model was analyzed.The test results revealed that the axial cumulative strain of the soil-rock fill can be categorized into three types:plastic stability,plastic creep,and incremental damage,according to stability theory.The specimen's axial cumulative strain in-creased with larger dynamic stress amplitudes,but decreased with greater confining pressures.The dynamic pore water pressure curve and the corresponding axial accumulated strain curve displayed the same developmental char-acteristics.In consideration of the development characteristics of creep-type cumulative strain in soil-rock mixed fill,a modified and improved model was proposed.The feasibility of the model was verified,and it can be effective-ly applied to strain curves exhibiting plastic creep behavior.关键词
土石混填料/大型动三轴试验/轴向累积应变/动应力幅值/动孔隙水压力/改进模型Key words
soil-rock mixed fill/large dynamic triaxial test/axial cumulative strain/dynamic stress amplitude/dy-namic pore water pressure/improved model分类
建筑与水利引用本文复制引用
刘家光,宋杨,王清洲,张志彬,齐子怡..循环荷载作用下土石混填料的蠕变模型研究[J].长江科学院院报,2023,40(12):147-153,7.基金项目
国家自然科学基金项目(51978237) （51978237）
河北省自然科学基金项目(E2018412002) （E2018412002）
河北省高等学校科研重点项目(ZD2021068) （ZD2021068）
河北省大学生科技创新能力培育专项 （）
