非线性广义文克尔模型探讨  

Discussion on nonlinear generalized Winkler model

作　　者：周峰[1,2] 宰金珉[1] 梅国雄[1] 

机构地区：[1]南京工业大学土木工程学院,南京210009 [2]东南大学交通学院,南京210096

出　　处：《岩土力学》2009年第6期1627-1630,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金项目资助(No.50678083);国家青年自然科学基金资助项目(No.50608038)

摘　　要：文克尔地基模型的最大缺陷是没有考虑地基土的非线性和连续性。利夫金模型虽然对其连续性进行了改进,但过分考虑了基础形状对基床系数的影响,还导致了在矩形基础长短边方向上基床系数的极不对称。为此提出非线性广义文克尔模型,对文克尔模型特征函数重新进行了定义,修正了利夫金模型的缺点,在合理考虑基础形状和尺寸对地基刚度影响的同时,还能分别模拟几种典型情况的反力分布形式。非线性广义文克尔模型还通过分段线性逼近实际p-s曲线的方法,考虑了地基土的非线性。算例分析表明,非线性广义文克尔模型具有一定的合理性和实用性。Without considering continuity and nonlinearity of subgrade is the limitation of Winkler model; and it is modified by Lifking model. However, the effect of foundation shape on coefficient of subgrade reaction considered by Lifking model is excessive. Asymmetry of coefficient of subgrade reaction along long and short sides of rectangular foundation is also caused, Nonlinear generalized Winkler model is presented to overcome the disadvantage of Lifking model, and to redefine the characteristic function of Winkler model, Nonlinear generalized Winkler model not only considers the effect of foundation shape and size on rigidity of subgrade reaction but also simulates several typical forms of subgrade reaction distributions. The nonlinear generalized Winkler model simulates the practical p-s curve by piecewise linear approximation. The nonlinearity of subgrade is also considered. The example results show that nonlinear generalized Winlder model is rational and available.

关 键 词：文克尔模型 非线性 基床系数 

分 类 号：TU4[建筑科学—土工工程]