筏板基础下薄层土地基承载力研究  

Ground bearing capacity of thin layer soil under raft foundation

作　　者：杨光华[1,2,3] 廖汉阳 YANG Guang-hua;LIAO Han-yang(Department of Civil Engineering,South China University of Technology,Guangzhou,Guangdong 510640,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou,Guangdong 510610,China;The Geotechnical Engineering Technology Center of Guangdong Province,Guangzhou,Guangdong 510610,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]广东省水利水电科学研究院,广东广州510610 [3]广东省岩土工程技术研究中心,广东广州510610

出　　处：《岩土力学》2023年第12期3405-3414,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52078143)。

摘　　要：筏板基础下薄层土地基的承载力与均匀地基的承载力不同,不能简单地按通常的天然地基承载力方法来确定。通过现场压板载荷试验确定薄层土地基的强度指标和变形参数,把筏板基础分为若干网格。采用切线模量分层总和法计算各网格的地基刚度,把筏板基础看作为各网格支承下的弹性地基板,计算各网格共同作用下板底的压应力;将各网格的压应力与用薄层土地基强度参数计算的极限承载力比较,以判断地基强度承载力的安全性;再依据筏板的沉降变形,由薄层土地基的强度承载力和筏板基础变形控制确定这种含薄层土地基的允许承载力;通过与有限元方法进行比较,证明其是一种较合适的确定筏板基础下薄层土地基承载力的方法。The ground bearing capacity of thin layer soil under raft foundation is different from that of uniform ground,and cannot be simply determined by using the usual natural ground bearing capacity method.This article determines the strength index and deformation parameters of the thin layer soil ground through field plate loading tests,and divides the raft foundation into several grids to calculate the foundation stiffness of each grid employing the tangent modulus layerwise summation method.The raft foundation is considered as an elastic foundation plate supported by each grid,and the compressive stress at the bottom of the plate under the joint action of each grid is calculated.The compressive stress of each grid is compared with the ultimate ground bearing capacity predicted using thin layer soil ground strength parameters to judge the safety of the ground bearing capacity,and then according the settlement deformation of the raft,the allowable bearing capacity of this thin layer soil ground is determined by the strength bearing capacity of the thin layer soil ground and the deformation control of the raft foundation.Compared with the finite element method,it has been proven that this is a more suitable method for determining the ground bearing capacity of the thin layer soil under the raft foundation.

关 键 词：筏板基础 切线模量法 地基承载力 薄层土 压板载荷试验 

分 类 号：TU470[建筑科学—结构工程]