哈尔滨工程大学学报2025，Vol.46Issue(2)：197-204,209,9.DOI:10.11990/jheu.202210035
不同初始剪应力下饱和珊瑚砂的液化特性
Liquefaction characteristics of saturated coral sand under various initial shear stresses
摘要
Abstract
Due to the unique marine environment,coral sands experience intricate stress conditions when subjected to seismic or wave in geological settings such as slopes.To investigate the impact of initial static shear stress on the liquefaction characteristics of saturated coral sand,a series of cyclic triaxial tests were conducted using a dynamic triaxial apparatus on coral sand specimens with varying relative densities(Dr).The test results indicate that the ax-ial strain(εa)of saturated coral sand primarily manifests in two modes:cyclic flow deformation and plastic cumula-tive deformation.The initial shear stress hinders the development of excess pore water pressure(ue),while ue2.5%(ue corresponding to εa=2.5%)shows insensitivity towards the cyclic stress ratio(CSR).Empirical equations for ue2.5%in saturated coral sands based on consolidation ratios(Kc)and Dr have been established.A stress parameter CSR/K1.5c is proposed which considers the effect of Kc,revealing a negative power function relationship with the number of cycles required to reach εa=2.5%at identical Dr.Additionally,a stressed excess pore water pressure model applicable to the increase in excess pore water pressure ratio with cycle ratio under different initial shear stresses was developed.The findings of this study not only enhance our understanding of the influence of initial stat-ic shear stress on the liquefaction characteristics of saturated coral sands but also provide valuable guidance for ma-rine infrastructure construction projects.Because of the special marine environment,coral sands are subject to com-plex stresses when subjected to earthquakes or wave action under geological conditions such as slopes.关键词
饱和珊瑚砂/初始剪应力/固结比/相对密度/动三轴试验/超静孔压/轴向应变/抗液化强度Key words
saturated coral sand/initial shear stress/consolidation ratio/relative density/dynamic triaxial test/ex-cess pore water pressure/axial strain/liquefaction strength分类
土木建筑引用本文复制引用
秦悠,杜歆宇,马维嘉,吴琪,陈国兴..不同初始剪应力下饱和珊瑚砂的液化特性[J].哈尔滨工程大学学报,2025,46(2):197-204,209,9.基金项目
国家自然科学基金项目(52278503,52208350). （52278503,52208350）
