淤泥固化土动力特性及在直立护岸抗震分析中的应用  

Dynamic characteristics of silt-solidified soil and its application in seismic analysis of vertical bank revetment

作　　者：赵杰[1] 向田一 王浩 ZHAO Jie;XIANG Tianyi;WANG Hao(College of Civil Engineering and Architecture,Dalian University,Dalian 116622,Liaoning,China;Shanghai Construction Engineering Group Co.,Ltd.,Shanghai 200080,China)

机构地区：[1]大连大学建筑工程学院,辽宁大连116622 [2]上海建工集团股份有限公司,上海200080

出　　处：《地震工程学报》2024年第5期1032-1042,共11页China Earthquake Engineering Journal

基　　金：国家自然科学基金重点项目(51738010);大连市科技创新基金计划项目(2021JJ13SN83)。

摘　　要：以大连临空产业园填海造地项目为背景,开展淤泥固化土动力特性试验研究。运用FLAC^(3D)有限元软件对不同地基处理方案的直立沉箱护岸在地震作用下进行动力响应模拟。从加速度响应、孔压与有效应力、残余变形等方面定量评价直立沉箱护岸结构的抗震安全性。动力特性试验结果表明:阻尼比与剪切应变和固化剂掺量呈正相关,且围压越高,阻尼越小。数值分析结果表明:在地震作用下,不同的地基条件下加速度放大系数呈现出不同的峰值;沉箱下方砂土层不液化;淤泥固化土地基上沉箱的残余变形小于原状淤泥地基且高水位能减小残余变形,提高沉箱的安全性。研究成果可为类似港口工程抗震设计提供参考。This paper investigates the dynamic characteristics of silt-solidified soil based on the land reclamation project at Dalian Linkong Industrial Park.The finite element software FLAC^(3D) was used to simulate the dynamic response of vertical caisson revetment structures with different foundation treatment schemes under earthquake action.The seismic safety of these revetment structures was quantitatively evaluated by analyzing factors such as acceleration response,pore pressure,effective stress,and residual deformation.The test results for the dynamic characteristics show that the damping ratio of silt-solidified soil increases with shear strain and the content of the curing agent.Additionally,higher confining pressures result in lower damping ratios.Numerical analysis results show that under earthquake action,the acceleration amplification coefficient shows a different peak value under different foundation conditions.The sand layer below the caisson does not experience liquefaction.Further findings reveal that the residual deformation of a caisson placed on a silt-solidified soil foundation is significantly smaller compared to one on an undisturbed silt foundation.Moreover,high water levels contribute to reducing residual deformation and improving the caisson safety.These insights can provide valuable references for the seismic design of similar port projects.

关 键 词：沉箱护岸 淤泥固化土 动力特性 抗震安全性 残余变形 

分 类 号：TU411.8[建筑科学—岩土工程]