岩土工程学报2026，Vol.48Issue(2)：301-310,10.DOI:10.11779/CJGE20241101
不排水条件下饱和黏土界面强度特性影响规律研究
Interface strength behaviors of saturated clay under fully undrained condition
摘要
Abstract
The interface strength between the suction bucket and the clay is a critical parameter in evaluating the penetration resistance during installation.Since the seabed is completely submerged,factors such as saturation degree,drainage conditions,and pore water pressure significantly influence the development of interface strength.Current interface testing devices fail to provide accurate measurement and control of interface saturation,drainage status,and pore water pressure,which limits their ability to reflect the soil-structure interface characteristics in ocean engineering.By modifying traditional strain-controlled triaxial instruments,this study achieved fully undrained interface shear and accurate measurement of pore pressure in saturated clay.Interface shear is evaluated at three shear rates,three roughness levels,and four consolidation pressures.During the tests,interfacial shear stress,deviatoric stress,pore water pressure,friction angle,and stress path are analyzed.The results indicate that as the shear rate increases,both the effective stress ratio and effective stress friction angle increase.Additionally,the maximum pore water pressure increases with increasing structural surface roughness.The interface shear characteristics are primarily influenced by the rate effect.As shear rate increases,the axial strain required to stabilize the interface pore water pressure also increases.Hence,careful control of clay saturation and undrained conditions is essential for accurate measurement of interface shear strength,which is crucial for reliable calculation of frictional resistance and suction pressure during suction foundation installation.关键词
界面强度/剪切速率/饱和黏土/排水状态/孔隙水压力Key words
interface strength/shearing rates/saturated clay/drainage condition/pore water pressure分类
建筑与水利引用本文复制引用
廖晨聪,黄骋驰,苏新斌,叶冠林,郑东生..不排水条件下饱和黏土界面强度特性影响规律研究[J].岩土工程学报,2026,48(2):301-310,10.基金项目
国家自然科学基金面上项目(52279106) （52279106）
上海市教委科研创新计划项目(2021-01-07-00-02-E00089)This work was supported by the National Natural Science Foundation of China(Grant No.52279106) （2021-01-07-00-02-E00089）
and Innovation Program of Shanghai Municipal Education Commission(Grant No.2021-01-07-00-02-E00089). （Grant No.2021-01-07-00-02-E00089）
