基于压缩曲线的非线性弹性地基上结构内力与沉降分析  

Analysis of Structural Internal Force and Settlement on Nonlinear Elastic Foundation Based on Compression Curve

作　　者：高兴和 张峰 吕犇 李灿 Gao Xinghe;Zhang Feng;Lv Ben;Li Can(Jiangsu Research Institute of Water Conservancy Planning and Design for Taihu Lake Co.,Ltd.,Suzhou 215100,Jiangsu,China;College of Mechanics and Materials,Hohai University,Nanjing 210000,Jiangsu,China)

机构地区：[1]江苏省太湖水利规划设计研究院有限公司,江苏苏州215100 [2]河海大学力学与材料学院,江苏南京210000

出　　处：《岩土工程技术》2023年第5期590-594,共5页Geotechnical Engineering Technique

基　　金：江苏省水利科技项目(2022087)。

摘　　要：地基过大沉降和不均匀沉降不仅对建筑物有较大危害,也是上部结构应力分布和变形的主要影响因素之一。工程上沉降计算采用的分层总和法,以压缩曲线(e-p曲线或e-lgp曲线)为输入,能较好体现土体变形的非线性,具有较高的精度,积累了大量的实践经验。提出一种弹性地基的数值计算方法,该方法基于压缩曲线,通过弹性理论推导获取切线弹模,采用非线性有限元方法进行计算。工程实践与具体算例表明,该方法在建筑物沉降计算上与分层总和法本质相同,但避免了繁琐的手算过程,计算结果全面丰富,更切合实际,对上部结构的应力变形分析也能较好地反应弹性地基的影响。基于压缩曲线的非线性弹性地基计算方法不需要复杂的土工试验,同时避免了简单的线弹性本构的缺点,具有一定的实用价值。Foundation settlement is not only harmful to buildings,but also one of the main factors affecting the stress and deformation of superstructure.The layerwise summation method used in engineering settlement calculation takes the compression curve(e-p curve or e-lgp curve)as the input,which better reflects the nonlinearity of soil deformation and has good accuracy.A numerical calculation method of elastic foundation was developed in this research.Based on the compression curve,the tangent elastic modulus was obtained through the derivation of elastic theory,and the nonlinear finite element method was used for calculation.The example shows that this method is essentially the same as the layerwise summation method in the calculation of foundation settlement,and obtains rich results without the cumbersome manual calculation process.The stress and deformation analysis of superstructure can also better reflect the influence of elastic foundation.The calculation method of nonlinear elastic foundation based on compression curve does not need complex geotechnical test,and avoids the disadvantage of simple linear elastic constitutive model,so it has strong practical value.

关 键 词：压缩曲线 分层总和法 沉降 应力变形分析 弹性地基 

分 类 号：TU470[建筑科学—结构工程]