砂土中裙式吸力基础上拔过程的反向端部承载力与土体变形规律  

Soil deformation and bearing capacity of reverse end for modified suction caissons in sand under uplift loading

作　　者：马士力 李大勇[1,2,3] MA Shili;LI Dayong(Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Civil Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点试验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590 [3]福州大学土木工程学院,福州350116

出　　处：《中国科技论文》2018年第19期2178-2182,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(51379118)

摘　　要：为了探究砂土中裙式吸力基础上拔过程中的承载特性,通过上拔模型试验,研究了裙式吸力基础在裙封闭状态下的抗拔承载力以及考虑不同上拔速率下裙式吸力基础反向端部承载力和基础周围土体的变形规律,探讨上拔速率和裙结构尺寸分别对裙式吸力基础反向端部承载力和周围土体变形的影响。结果表明:随着上拔速率的增大,裙式吸力基础的主桶反向端部承载力与裙结构反向端部承载力逐渐增大;裙宽是影响裙式吸力基础反向端部承载力的主要因素;裙结构尺寸和拔出速率对基础周围土体变形影响显著。In order to explore the uplift behavior of the modified suction caisson(MSC)in sand,model tests on the MSCs with closed skirt structure under uplift loading were conducted.The MSCs were polluted out from the sand bed under various uplift loading rates.The soil deformation around foundation and the reverse end bearing capacity of the modified suction caisson were both studied.Influences of the uplift loading rate and the external structure size on the reverse bearing capacity and the soil deformation around foundation were investigated as well.Results showed that bearing capacities of the reverse end for the internal structure and the skirt structure increased with the increased uplift loading rate and the external skirt structure dimension.The external skirt structure width dominated the reverse end bearing capacity.The external structure width and the pullout rate had a significant influence on the soil deformation around the modified suction caisson.

关 键 词：裙式吸力基础 模型试验 上拔速率 反向端部承载力 土体变形 

分 类 号：TU476[建筑科学—结构工程]