粉砂质泥岩蠕变特性与非线性黏弹塑性本构模型
Creep characteristics of silty mudstone and nonlinear viscoelastic-plasticity constitutive model
摘要
Abstract
In order to guarantee the long-term stability of silty mudstone in slope and tunneling projects,the DZSZ-150 multi-field coupling rock triaxial pressure testing machine was used to conduct creep tests on silty mudstone specimens of similar materials under different surrounding pressures.Based on the testing results,a nonlinear viscoelastic-plastic constitutive model describing the whole creep process of silty mudstone was established,and the proposed creep model was verified for its rationality and feasibility by taking the results at a confining pressure of 7 Mpa as an example.It show that the steady-state creep rate of the specimen is related to the magnitude of the deviatoric stress,and with increase of the deviatoric stress,the steady-state creep rate and the deviatoric stress conform to an exponential function relationship;the creep rate in the accelerated creep stage is significantly greater than that in the decelerated creep and steady-state creep at low stress levels,and the creep damage occurs in a very short time;a nonlinear viscoelastic-plastic constitutive model is proposed to describe the whole creep process of the silty mudstone,which can describe the creep-deformation law of the whole process of creep-damage of silty mudstone,reflecting the creep characteristics of silty mudstone under different levels of deviatoric stress,and avoiding the problem that the classical model cannot accurately describe the accelerated creep process.关键词
粉砂质泥岩/蠕变试验/加速蠕变/蠕变特性/本构模型Key words
silty mudstone/creep test/accelerated creep/creep characteristics/constitutive model分类
建筑与水利引用本文复制引用
付宏渊,戚双星,史振宁,高乾丰,匡波,曾铃..粉砂质泥岩蠕变特性与非线性黏弹塑性本构模型[J].土木与环境工程学报（中英文）,2024,46(3):1-8,8.基金项目
国家自然科学基金(51838001、51908069、52078066、52078067) （51838001、51908069、52078066、52078067）
湖湘青年科技创新人才项目(2020RC306) （2020RC306）
湖南省重点领域研发项目(2019SK2171) （2019SK2171）
长沙市杰出创新青年培养计划(kq1905043) （kq1905043）
国家级大学生创新创业训练项目(202120536003) （202120536003）
长沙理工大学公路养护技术国家工程实验室开放基金(kfj170103) National Natural Science Foundation of China(Nos.51838001,51908069,52078066,52078067),Youth Scientifc and Technological Innovation Talents of Hunan Province(No.2020RC306),Research and Development Projects in Key Fields of Hunan Province(No.2019SK2171),Outstanding Innovative Youth Training Program of Changsha City(No.kq1905043),College Students Innovation and Entrepreneurship Program of China(No.202120536003),Open Fund of National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science&Technology(No.kfj170103) （kfj170103）
