摘要
通过对土材料模型及参数的确定方法的相关现状进行分析总结,发现用于表征桩基关系的土材料模型及材料参数,无论在试验方法、本构模型遴选,还是模型参数的确定方面都存在不合理现象,同时这也是导致桩基关系不合理的主要成因。保证有限元仿真设计的桩基关系符合抗撞结构的使用要求,并与实际试验安装现场的桩基关系基本一致,即要保证土材料模型及参数与实际试验使用的回填土材料类型及参数的一致性。为此,桩基关系的研究需从桩基试验方法、土材料模型遴选以及模型参数反演3个方面进行完善。针对这3个方面研究存在的具体问题,分别给出了各自潜在的解决方案和未来可能的研究方向。首先,完善子结构级模型的桩基约束条件试验系统,为设计合理的桩基关系提供试验基础;其次,以试验为基础,选择或开发合适的土材料模型后,研究新的反演识别方法,以获取材料模型参数。综合试验到仿真分析的一系列措施,完善桩基关系匹配研究,研究成果对道路交通安全的提升具有极为重要的现实意义。
The current situation that the determination methods for soil material models and material parameters is analyzed and summarized.It is found that the soil material models and material parameters used to characterize the relation between pile and foundation is unreasonable in the experimental method,constitutive model selection and the model parameters determination.At the same time,it is the main cause that contributed to the irrationality of relation between pile and foundation.It is necessary to ensure the pile foundation relation designed by FE simulation meets the using requirements of the anti-collision structure and keeps consistent with the pile foundation relation in the actual test installation site.In another word,it is necessary to ensure the consistency of soil material model and parameters with backfill material type and parameters used in the actual test.Therefore,the research on pile foundation relation should be improved from 3 aspects:pile foundation test method,soil material model selection and model parameter inversion.Aiming at the specific problems existing in these 3 aspects,the potential solutions and possible future research directions are presented respectively.First,the test system for pile foundation constraints of substructure model is improved to provide the test basis for designing reasonable pile foundation.Then,on the basis of experiment,after selecting or developing applicable soil material model,a new inversion identification method is studied to obtain the material model parameters.The study of pile foundation relation matching is improved by combining the countermeasures of test and simulation analysis.The research result is of great practical significance to the improvement of road traffic safety.
作者
雷正保
刘博
LEI Zheng-bao;LIU Bo(School of Vehicle and Mechanical Engineering,Changsha University of Science and Technology,Changsha Hunan 410114,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2020年第2期47-54,共8页
Journal of Highway and Transportation Research and Development
基金
湖南省重点领域研发计划项目(2019SK2174).
关键词
道路工程
抗撞结构
桩基关系
材料模型参数
桩基试验
road engineering
anti-collision structure
pile foundation relation
material model parameter
pile foundation test
