变刚度布桩群桩基础的承载特性  

Load Characteristics of Pile Group Foundation with Variable Stiffness

作　　者：李金良 李振宝 崔伟[2] 房凯[3] LI Jinliang;LI Zhenbao;CUI Wei;FANG Kai(Shandong Beitli Foundation Engineering Technology Co.,Ltd.,Jining 272100,Shandong,China;Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,Shandong,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266510,Shandong,China)

机构地区：[1]山东倍特力地基工程技术有限公司,山东济宁272100 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]山东科技大学能源与矿业工程学院,山东青岛266510

出　　处：《济南大学学报（自然科学版）》2020年第5期475-481,共7页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51408345,51778345)。

摘　　要：针对大规模的等刚度群桩基础中不同位置的桩易出现蝶形差异沉降、桩顶反力马鞍形分布、承台弯矩增大等问题,采用有限元模型和数值计算方法研究等刚度九桩在施加均布荷载时的沉降、桩顶反力、荷载分担比等问题;通过改变群桩桩长、桩径、桩距、承台厚度建立4组单变量模型,与等刚度群桩模型的沉降、桩顶反力、桩土荷载分担比等数据进行对比,研究变刚度群桩对于差异沉降控制的作用。结果表明,群桩模型的中心桩所受承载力及沉降最大,在变刚度设计中增加中心桩桩长及桩径时,群桩差异沉降控制效果较好。To solve the problems such as butterfly differential settlement,saddle-shaped distribution of pile-top reaction force,and increasing of pile cap bending moment,the settlement,pile-top reaction force,and load sharing ratio of nine piles with equal stiffness were studied by using finite element model and numerical calculation.Four sets of uni-variate models were established by changing length,diameter of pile,distance between piles,and pile-cap thickness of pile group,and the effect of variable stiffness pile group on differential settlement control was studied by comparing with the data of settlement,pile-top reaction force,and pile-soil load sharing ratio of equal stiffness pile group model.The results show that the bearing capacity and settlement of the central pile in the pile group model are the largest.In the design of variable stiffness,the differential settlement control effect of the pile group is better when the length and diameter of the central pile are increased.

关 键 词：群桩 承载特性 数值模拟 变刚度 差异沉降 

分 类 号：TU473[建筑科学—结构工程]