防灾减灾工程学报2025，Vol.45Issue(2)：317-328,12.DOI:10.13409/j.cnki.jdpme.20241227001
基于CPTu数据的阳江海域黏土循环强度评价方法研究
Evaluation Method for Cyclic Strength of Marine Clay in Yangjiang Offshore Area Based on CPTu Data
摘要
Abstract
The cyclic force characteristics of seabed foundation soils and their evaluation methods are recognized as critical scientific issues in the design and stability analysis of marine engineering struc-tures such as dikes,offshore wind turbines,subma-rine pipelines,offshore oil platforms,and break-waters.To systematically investigate the cyclic strength of marine clay and its evaluation method,und-rained cyclic triaxial tests and in-situ cone penetration test CPTu were conducted on clay from the Yangjiang offshore area.The primary objective of this study is to provide more reliable geotechnical in-vestigation guidance for the rapid development of offshore wind farms.The results showed that the cy-clic characteristics of marine clay significantly differed from those of onshore Fujian standard sand.Ma-rine clay mainly exhibited tensile failure under cyclic loading.The double-amplitude axial strain(εda)of samples under cyclic loading showed two development patterns:slow-sudden and rapid-stable.The power-law relationship between εda and the number of cycles(N),and that between excess pore pres-sure ratio and cyclic ratio(N/NL)conformed to a hyperbolic relationship.The applicability of existing liq-uefaction evaluation methods based on CPTu data for undisturbed marine fine-grained soils was an-alyzed.Based on the correlation between field and laboratory stress conditions of unit soil,an evalua-tion method for the cyclic strength of ma-rine clay was developed using CPTu data and burial depth(H).关键词
海洋黏土/循环强度/原位孔压静力触探/孔压/轴向应变Key words
marine clay/cyclic strength/in-situ cone penetration test/pore pressure/axial strain分类
土木建筑引用本文复制引用
毛健伟,高尚,吴琪..基于CPTu数据的阳江海域黏土循环强度评价方法研究[J].防灾减灾工程学报,2025,45(2):317-328,12.基金项目
国家自然科学基金项目(52378346)资助 （52378346）
