水利学报2025，Vol.56Issue(7)：844-852,9.DOI:10.13243/j.cnki.slxb.20250117
考虑加载历史的粗粒土蠕变过程通用数学模型
General mathematical model for creep process of coarse grained soil considering loading history
摘要
Abstract
The multi-stage loading-creep history before the creep process was distinguished and described.Based on large-scale compression creep experiments of rockfill materials and literature data,the influence mechanism of the loading history on the creep process was analyzed.The prior loading rate immediately preceding the creep has a sig-nificant impact on the initial relaxation creep stage of the creep and little effect on the later equilibrium creep stage.When there is a large incremental loading process between the current creep process and the historical creep process,the historical creep process and earlier loading rates have no effect on the current creep.A model was proposed sug-gesting that equilibrium creep in the middle and later stages of creep develops along the inherent straight creep base-line in the logarithmic creep rate-logarithmic time coordinate system.The mechanism of low prior loading rate on the reduction of creep rate in the relaxation creep stage was explained.The calculation methods for relaxation creep rates and relaxation times were clarified.A general form of creep-time mathematical relationship,including both seg-mented and continuous types,considering loading history and applicable to different creep processes,was suggested.The experimental data proved that the proposed creep-time mathematical relationship can be well applied to the description of creep processes with different prior loading histories.关键词
粗粒土/加载历史/蠕变/数学模型/弛豫蠕变阶段/平衡蠕变阶段Key words
coarse grained soil/load history/creep/mathematical model/relaxation creep stage/equilibrium creep stage分类
建筑与水利引用本文复制引用
邓刚,张茵琪,张延亿,苏羽,孙向军..考虑加载历史的粗粒土蠕变过程通用数学模型[J].水利学报,2025,56(7):844-852,9.基金项目
国家重点研发计划项目(2022YFC3005501) （2022YFC3005501）
中国水科院基本科研业务费项目(GE0145B032021) （GE0145B032021）
