黏性土大数据黏弹塑性本构模型研究  

Research on Viscoelasto-Plastic Constitutive Model of Cohesive Soil with Big Data

作　　者：凌跃 刘元雪 赵久彬 Ling Yue;Liu Yuanxue;Zhao Jiubin(Chongqing Key Laboratory of Geomechanics&Geoenvironmental Protection,Department of military installations,Army Logistics University of PLA,Chongqing 401311,China)

机构地区：[1]陆军勤务学院设施系岩土力学与地质环境保护重庆市重点实验室,重庆401311

出　　处：《地下空间与工程学报》2023年第3期725-736,共12页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41877219);重庆市自然科学基金(cstc2019jcyj-msxmX0585)。

摘　　要：土的动力本构模型是土动力学研究的核心问题之一,是开展重要土木工程动力数值计算的基础。一般动力本构模型存在假设多、适用范围小、不能合理反映岩土材料的动力特性等问题。从黏性系数入手,通过黏性土动力荷载作用下的大量试验数据的大数据深度挖掘,确立黏性系数的主要影响因素,建立黏性系数的大数据计算模型。在本研究团队的大数据静力广义塑性力学本构模型基础上,以黏弹塑性理论为模型框架,将黏性系数计算模型引入黏弹塑性模型中,建立黏性土大数据广义塑性力学黏弹塑性本构模型。经验证,该模型拟合程度为0.956,能够较好模拟黏性土在动荷载下的动力特性。The dynamic constitutive model of soil is one of the core issues of soil dynamics research,and it is the basis for carrying out dynamic numerical calculation of important civil engineering.The general dynamic constitutive model has many problems,such as many assumptions,small scope of application,and inable to reasonably reflect the dynamic characteristics of geotechnical materials.Starting from the viscous coefficient,through the big data deep mining of a large number of experimental data under the dynamic load of cohesive soil,the main influence coefficient of the viscous coefficient is determined,and the big data calculation model of the viscous coefficient is established.On the basis of the big data static generalized plastic mechanics constitutive model of the research team,the viscous coefficient calculation model was introduced into the viscoelasto-plastic model with the viscoelasto-plastic theory as the model framework,and the generalized plastic mechanics viscoelastoplastic constitutive model of the big data cohesive soil was established.It has been proved that the fitting degree of this model is 0.956,which can better simulate the dynamic characteristics of cohesive soils under dynamic load.

关 键 词：黏性土 动力本构模型 大数据 动力特性 广义塑性力学 

分 类 号：TU442[建筑科学—岩土工程]