黏土地基中斜向荷载作用下吸力式沉箱的承载性能试验研究  

Experiment study on bearing performance of suction caisson under oblique load in clay

作　　者：戴国亮[1,2] 黄琚琦 候晓愉 Dai Guoliang;Huang Juqi;Hou Xiaoyu(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [2]东南大学土木工程学院,南京211189

出　　处：《东南大学学报（自然科学版）》2023年第6期1034-1043,共10页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52078128,52178317)。

摘　　要：为了研究黏土地基中斜向荷载作用下吸力式沉箱的承载性能,开展了一系列室内模型试验,分析了斜向荷载作用下吸力式沉箱基础在不同角度和不同加载位置的极限承载力及荷载-位移变化规律.通过ABAQUS建立了吸力式沉箱基础的斜向受荷三维数值模型,分别采用长径比为3和6的模型探究了加载位置对基础极限承载力的影响,进而确定了沉箱基础最优系泊点的位置,并基于极限包络线方法提出了斜向荷载作用下吸力式沉箱基础极限承载力的计算方法.结果表明:当荷载方向与水平向的夹角小于30°时,加载位置深度对基础极限承载力的影响较大;当荷载方向与水平向的夹角大于45°时,加载位置深度对基础极限承载力的影响较小.在基础承载力受加载位置影响较大的斜向荷载角度范围内,随着荷载角度增加,其对应的最优系泊点位置有所上移.In order to study the bearing capacity of suction caisson under oblique load in clay foundation,a series of laboratory model tests were carried out to analyze the ultimate bearing capacity to study the ultimate bearing capacity and load-displacement of suction caisson foundation under oblique loads at different angles and loading positions.The three-dimensional numerical model of suction caisson foundation under oblique load was established by ABAQUS.The effects of length-diameter ratio and loading position on the ultimate bearing capacity of the foundation were explored.The location of the optimal mooring point of caisson foundation was determined,and a method for calculating the ultimate bearing capacity of suction caisson foundation under oblique load was proposed based on the limit envelope method.The results show that when the angle between the load direction and the horizontal direction is less than 30°,the burying depth of the loading position has a great influence on the ultimate bearing capacity of the suction caisson foundation.When the angle between the load direction and the horizontal direction is more than 45°,the buried depth of the loading position has little influence on the ultimate bearing capacity of the foundation.In the range of oblique load angle where the bearing capacity of foundation is greatly affected by the loading position,the position of the corresponding optimal mooring point moves upward with the increase of the loading angle.

关 键 词：吸力式沉箱基础 斜向荷载 软黏土 极限承载力 

分 类 号：TU473.2[建筑科学—结构工程]