基于Winkler模型的双向增强体复合地基沉降计算

Settlement calculation of two-direction reinforced composite foundation based on Winkler model

将加筋体和复合地基垫层作为一个整体薄板加以考虑,在考虑薄板非线性变形及加筋体水平抗力作用的基础上,基于虚功理论及Winkler弹性地基模型,建立了双向增强体复合地基加固区沉降计算方法。该方法能综合反映上部荷载、面积置换率、垫层及桩间土刚度、桩土应力比等主要因素的影响。以其为基础,设计完成了2组双向增强体复合地基室内模型试验,得到了其相应的荷载-沉降曲线及桩土应力比数据。模型试验与工程实例计算分析表明,加筋垫层的水平抗力对于降低复合地基沉降量是有利的,其影响不容忽视,同时验证了该方法的合理性和可行性。

Based on the virtual work theory and the Winkler elastic foundation model,considering nonlinear deformation of sheet and net materials and composite foundation cushions as an overall net pad as well as taking the role of the level of resistance into account in the calculation,a formula for calculating the settlement of two-direction reinforced composite foundation was deduced.The deduced formula reflects the effects of load magnitude,the replacement ratio of composite foundation,rig ties of mattress and the surrounding soil,pile-soil stress ratio,etc.Besides,two groups model tests of composite foundation are designed and a large amount of data about the load-settlement,pile-soil stress ratio are obtained.Finally,through model tests and an engineering example,the reasonableness of the formula is verified.The results indicate that the horizontal resistance of reinforced mattress helps to reduce the residual settlement;and the effects of which should be treasured.