柔性基础下复合地基沉降规律研究  

STUDY ON THE SETTLEMENT LAW OF THE COMPOSITE GROUND UNDER A FLEXIBLE FOUNDATION

作　　者：吕文志[1,2] 李春智 俞建霖[1] 刘超[1] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,杭州310058 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [3]山东滨州市建筑设计研究院设计一所,山东滨州256600

出　　处：《工业建筑》2010年第9期58-65,57,共9页Industrial Construction

基　　金：国家自然科学基金项目(50708093);东南大学混凝土及预应力混凝土结构教育部重点实验室项目(200608)

摘　　要：柔性基础下复合地基已广泛应用于公路和铁路路堤、水利土石坝、尾矿坝及各类堆场等工程领域,但其理论尚落后于工程实践。结合解析法研究现状分析,对所推导的柔性基础下复合地基沉降的简化解析解给予介绍,并通过工程实例对该解析解的可靠性进行验证。然后,基于该解析解和标准算例,对系统8个影响因素与等沉面高度、中性点位置、向上和向下的刺入变形及桩和土的沉降等内在联系作了分析。结果表明:系统8个因素对各沉降特性指标都有不程度的影响,必须重视对系统上、下部共同作用的深入研究。The theory lags far behind the engineering practice,though the composite ground under flexible foundation has been widely applied to several engineering fields,such as embankments of highway and railway,dams,tailing dams,stack yards.Combined with the present situation analysis of analytical method,the settlement characteristics of the composite ground under flexible foundation was summarized firstly.Then,a simplified analytical solution was presented briefly.The fellowing verification by an engineering case indicates that the solution can more accurately reflect the working behavior of the composite ground under a flexible foundation.And then,on a basis of a standard example,the relationships among eight influence factors and the height of the equal settlement plane,the depth of the neutral point,the stab deformation,the settlement of pile and soil etc.were studied through the solution.It can be concluded that the factors of the four components of the system can all affect the settlement characteristics more or less.It is necessary to pay more attention to the composite ground under flexible foundation based on super-sub structure interaction.

关 键 词：柔性基础下复合地基 解析解 沉降特性 影响因素 共同作用 

分 类 号：TU433[建筑科学—岩土工程]