市政技术2025，Vol.43Issue(11)：29-35,7.DOI:10.19922/j.1009-7767.2025.11.029
渗流侵蚀作用下土体力学性能劣化机制研究
Study on the Degradation Mechanisms of Soil Mechanical Properties Under Seepage-induced Erosion
张程1
作者信息
- 1. 长沙核工业工程勘察院有限公司,湖南长沙 410699
- 折叠
摘要
Abstract
A systematic experimental study was conducted to investigate the influence of seepage-induced erosion on the mechanical behavior of soils in order to reveal the degradation mechanisms of stress-strain characteristics,fail-ure strength,and shear strength parameters under conditions of fine particles loss.The saturated remolded speci-mens with various degrees of erosion were prepared by the salt particles substitution method and unconsolidated and undrained triaxial compression tests were conducted to systematically analyze their mechanical response patterns.The results demonstrate that:1)the seepage-induced erosion markedly alters the stress-strain curves which exhibit strain-hardening types and a systematic downward shift with the increase in the mass fraction of lost fines,indicat-ing concurrent deterioration of stiffness and strength of soils;2)The failure strength shows an approximately linear negative correlation with the fraction of particle loss,while the reinforcing effect of confining pressure gradually di-minishes with erosion intensifying;3)The shear strength parameters are highly sensitive to seepage erosion.The maximum decrease of cohesion and internal friction angle reaches up to 10.24％and 48.28％,respectively.This work quantitatively establishes the relationship between erosion degree and mechanical parameter degradation,clarifies the evolution mechanism of soil strength under the combined action of confining pressure and seepage erosion,which provides essential experimental evidence for evaluating seepage erosion hazards in engineering practice.关键词
渗流侵蚀/三轴试验/静力学特性/细颗粒流失/土体结构劣化Key words
seepage erosion/triaxial test/statics property/fine particles loss/soil structure deterioration分类
建筑与水利引用本文复制引用
张程..渗流侵蚀作用下土体力学性能劣化机制研究[J].市政技术,2025,43(11):29-35,7.
