长江科学院院报2024，Vol.41Issue(7)：132-138,7.DOI:10.11988/ckyyb.20230149
考虑非饱和土基质吸力-回弹指数相关性的弹塑性本构模型及有限元实现
Swelling Index and Matric Suction Relations for Unsaturated Soil Elasto-plastic Constitutive Model in FEM
摘要
Abstract
The swelling index,a crucial parameter for soil deformation,holds significant importance in the critical state elasto-plastic constitutive model.Unlike the compressibility index,which has been extensively reported in lit-erature,the variation of the swelling index with matric suction has often been overlooked in theoretical studies of unsaturated soil constitutive models.To address this gap,oedometer tests were conducted on remolded silt speci-mens sourced from Hangzhou,China.Under suction-controlled conditions,utilizing an oedometer equipped with a GDS direct shear chamber,the experimental program comprised three tests conducted at matric suction levels of 50,100,and 200 kPa.The relationship between matric suction and the swelling index,denoted as κ(s),was estab-lished and fitted.Validation was performed by comparison with previous experimental studies.Furthermore,this κ(s)relationship was incorporated into an unsaturated soil-extended Cam-clay elasto-plastic model.An explicit inte-gration with a substepping error control algorithm was implemented within the ABAQUS finite element method(FEM)UMAT subroutine.The numerical modeling results of the silt oedometer tests,coupled with the UMAT sub-routine,exhibited high agreement with laboratory tests.关键词
非饱和土/基质吸力/回弹指数/本构模型/有限元模型Key words
unsaturated soil/matric suction/swelling index/constitutive model/finite element method分类
建筑与水利引用本文复制引用
程昊,熊大生,唐辉明,张抒..考虑非饱和土基质吸力-回弹指数相关性的弹塑性本构模型及有限元实现[J].长江科学院院报,2024,41(7):132-138,7.基金项目
中铁第四勘察设计院集团有限公司科研课题(2020k158) （2020k158）
湖北巴东地质灾害国家野外科学观测研究站开放基金课题(BNORSG202213) （BNORSG202213）
