中南大学学报（自然科学版）2024，Vol.55Issue(4)：1654-1664,11.DOI:10.11817/j.issn.1672-7207.2024.04.033
红层泥岩填料蠕变特性及分数阶五元件非线性蠕变模型研究
Study of creep characteristics of red mudstone filling and fractional five-element nonlinear creep model
摘要
Abstract
In order to reveal the creep mechanical characteristics of red mudstone filling,triaxial CU creep test with graded loading of red mudstone filling in Gansu Province was carried out,and the creep characteristics such as the axial creep,creep rate and stress-strain isochronous curves of red mudstone filled with different moisture contents and stress levels were analyzed.Based on the characteristic analyses of creep curves of red mudstone filling,fractional calculus was introduced to construct a fractional five-element nonlinear creep model suitable for red mudstone filling in Gansu Province,and the model parameters were identified and analyzed.The results show that the red mudstone filling in Gansu Province has obvious creep characteristics,showing nonlinear attenuation creep,and the creep deformation increases significantly with the increase of moisture content and deflection stress.The stress-strain isochronous curves show nonlinear characteristics and obvious inflection point,and the long-term strength of the Gansu red mudstone filling is 0.6-0.8 times the instantaneous strength.The constructed model can accurately describe the creep characteristics of Gansu red mudstone filling,and the fitting effect on the experimental results is significantly better than those of the Burgers and Merchant models.关键词
红层泥岩填料/三轴CU蠕变试验/蠕变特性/分数阶微积分/非线性蠕变模型Key words
red mudstone filling/triaxial CU creep test/creep property/fractional calculus/nonlinear creep model分类
建筑与水利引用本文复制引用
余云燕,杜乾中,罗崇亮,丁小刚,李永鹏..红层泥岩填料蠕变特性及分数阶五元件非线性蠕变模型研究[J].中南大学学报（自然科学版）,2024,55(4):1654-1664,11.基金项目
甘肃省科技计划项目(21YF5GA050) （21YF5GA050）
甘肃省教育厅产业支撑计划项目(2021CYZC-28) （2021CYZC-28）
甘肃省交通运输厅科技研发项目(2021-12)(Project(21YF5GA050)supported by the Science and Technology Plan of Gansu Province （2021-12）
Project(2021CYZC-28)supported by the Department of Education Industry Support Program of Gansu Province （2021CYZC-28）
Project(2021-12)supported by the Science and Technology Research and Development Program of Department of Transportation of Gansu Province) （2021-12）
