南京工业大学学报（自然科学版）2026，Vol.48Issue(2)：231-238,8.DOI:10.3969/j.issn.1671-7627.2026.02.010
固结条件与层状结构对互层土力学特性的耦合影响
Coupled effects of consolidation conditions and layered structure on the mechanical properties of interbedded soils
摘要
Abstract
Interbedded soil is a special type of structured soil formed by the alternating deposition of different soil types.Its mechanical behavior is strongly affected by the combined influence of the initial consolidation state and the layered structure.Most studies focus on isotropic consolidation.However,the mechanical responses of interbedded soil under anisotropic consolidation have not been systematically investigated.In this study,interbedded soil specimens composed of silty clay and silt were prepared.Undrained triaxial compression tests were conducted under conditions of isotropic and anisotropic consolidation.The effects of the initial consolidation state on the stress-strain relationship,development of pore water pressure,effective stress path,and failure mode were systematically investigated.The results indicate that the mechanical behavior of interbedded soil lies between that of silty clay and silt and is closer to that of silty clay.Anisotropic consolidation significantly enhances soil dilatancy.It suppresses the formation and development of shear bands.As a result,barreling failurebecomes more likely.Both the absolute layer thickness and the thickness ratio jointly control the deformation and strength of interbedded soil.The secant modulus of anisotropically consolidated specimens is generally lower than that of isotropically consolidated specimens.This result indicates that the initial shear stress weakens the shear resistance of the soil skeleton.These findings provide a theoretical basis for geotechnical engineering design in foundations composed of interbedded soil.关键词
互层土/不排水三轴压缩/等压固结/偏压固结/破坏模式/应力路径/割线模量Key words
interbedded soil/undrained triaxial compression/isotropic consolidation/anisotropic consolidation/failure mode/stress path/secant modulus分类
建筑与水利引用本文复制引用
王小耿,朱晓峰,余越,胡东康,胡楠,秦从宇,王志华,申志福..固结条件与层状结构对互层土力学特性的耦合影响[J].南京工业大学学报（自然科学版）,2026,48(2):231-238,8.基金项目
国网江苏省电力有限公司省管产业科技项目(JC2025073) （JC2025073）
国家自然科学基金面上项目(52478346) （52478346）
