岩土力学2025，Vol.46Issue(5)：1489-1500,1510,13.DOI:10.16285/j.rsm.2024.0936
横观各向同性非饱和黄土蠕变特性及沉降预测
Creep characteristics and settlement prediction of transversely isotropic unsaturated loess
摘要
Abstract
Upon completing large-area layered filling,the foundation soil exhibits transverse isotropy and is predominantly unsaturated,making post-construction settlement prediction challenging.Additionally,the creep model considering transverse isotropy and unsaturated characteristics has not been proposed.Therefore,the true triaxial apparatus for unsaturated soil was enhanced,and transversely isotropic unsaturated loess samples were prepared.The relationship between matrix suction and moisture content at various depths in transversely isotropic unsaturated loess was determined using soil-water characteristic curve tests.The creep characteristics of loess fill under varying moisture content,degree of compaction,deviatoric stress,and net confining pressure were examined using a consolidation drainage test system.According to the creep curve,the expressions for six parameters in the modified Burgers element model were determined,establishing a post-construction settlement prediction method for transversely isotropic unsaturated loess fill foundations.The results show that the transversely isotropic unsaturated loess exhibits distinct creep characteristics,primarily nonlinear attenuation creep.The degree of compaction,moisture content,deviatoric stress and net confining pressure significantly affect its creep characteristics.Creep stability strain is linearly related to the degree of compaction.Enhancing soil compaction can effectively reduce post-construction settlement of the fill foundation.A prediction algorithm based on the modified Burgers model,which reflects the influence of degree of compaction,moisture content,and stress level,and accurately describes the post-construction settlement behavior of transversely isotropic unsaturated loess fill foundations,is established.Actual engineering monitoring results demonstrate that the proposed settlement prediction algorithm is simple,practical,and effective.The research results can enrich and advance the creep model of unsaturated soil,and provide a scientific basis for solving the problem of deformation calculation of high fill foundation.关键词
横观各向同性/非饱和黄土/填方地基/三轴蠕变试验/修正Burgers模型/工后沉降预测Key words
transverse isotropy/unsaturated loess/fill ground/triaxial creep test/modified Burgers model/post construction settlement prediction分类
土木建筑引用本文复制引用
杨校辉,赵子毅,郭楠,钱豹,朱彦鹏..横观各向同性非饱和黄土蠕变特性及沉降预测[J].岩土力学,2025,46(5):1489-1500,1510,13.基金项目
国家自然科学基金项目(No.52368049,No.52168051,No.42462028) （No.52368049,No.52168051,No.42462028）
兰州市青年科技人才创新项目(No.2023-QN-27,No.2023-QN-52).This work was supported by the National Natural Science Foundation of China(52368049,52168051,42462028)and Lanzhou Young Scientific and Technological Talents Innovation Project(2023-QN-27,2023-QN-52). （No.2023-QN-27,No.2023-QN-52）
