刍议多桩型复合地基的设计方法  

Design Method of Multi-Columns Composite Foundation

作　　者：彭良泉 PENG Liangquan(Changjiang Surveying,Planning,Design and Research Co.,Ltd.,Wuhan 430010;National Dam Safety Engineering Technology Research Center,Wuhan 430010)

机构地区：[1]长江勘测规划设计研究有限责任公司,武汉430010 [2]国家大坝安全工程技术研究中心,武汉430010

出　　处：《土工基础》2023年第5期802-806,815,共6页Soil Engineering and Foundation

基　　金：国家大坝中心自主创新项目(CX2015Z33)。

摘　　要：目前多桩型复合地基设计中,由于桩与桩间土承载能力修正系数取值经验性较强导致承载力计算结果主观性较大,加固区采用复合压缩模量导致沉降计算值与实测值相差较大。利用桩土变形协调方法从理论上得到了真实的桩土应力比和承载能力修正系数,避免了主观确定承载能力修正系数的缺陷,使复合地基的沉降和承载力计算更加准确和科学;根据复合地基的形成条件,提出了垫层的定量设计方法,避免了定性设计的缺陷。In view of the problems existing in the design of multi-columns composite foundation,such as the large subject of the estimation results due to the empirical value to the bearing capacity correction coefficient of soils and columns,as well as the large difference between the estimated and the measured settlement values when the composite compression modulus is used in the improvement area for the composite foundation.By using the column-soil deformation conformity method,the real column-soil stress ratio and bearing capacity correction coefficient are obtained theoretically,which avoids the defect of determining the bearing capacity correction coefficient subjectively and makes the settlement and bearing capacity estimation of the composite foundation more accurate and scientific.In the view of the problems that the composite foundation cannot be formed and the building foundation and the natural ground are separated due to the qualitative design of the composite foundation cushion layer,a quantitative design method of the cushion layer is proposed according to the formation conditions of the composite foundation,which avoids the defects of qualitative design.

关 键 词：复合地基 变形协调 沉降 承载力 垫层 

分 类 号：TU472[建筑科学—结构工程]