摘要
在对刚性桩复合地基的工作机理及受荷过程中刚性桩与桩间土的受力特性进行分析探讨的基础上,引入Mylonakis & Gazetas模型模拟桩与桩及桩与土之间的相互作用,充分考虑桩侧土体的非线性特性,假定桩侧土剪应力与剪应变的弹塑性关系,应用剪切位移法分别导出弹性阶段及弹塑性阶段的桩顶荷载与桩顶位移的显式关系式.在此基础上,考虑垫层作用的影响,提出一种能综合考虑桩-土-垫层体系共同作用的刚性桩复合地基沉降计算方法.结合某模型试验实测结果对文中理论计算进行了验证,其结果表明该计算方法是可行的.
The working mechanism of rigid-pile composite foundation was discussed and the working performance of rigid-piles and surrounding soil in the loading process was analyzed. Mylonakis ＆ Gazetas model was introduced to simulate the interaction of pile and pile, pile and soil. Due to the nonlinear characteristic of surrounding soil, the relationship between its shear stress and shear strain was assumed to be elastic-plastic. By employing the shear displacement method, the different explicit relational equations between the load and the displacement at the top of pile in either elastic or elastic-plastic period were presented. Considering the effect of cushion, a settlement calculation method of rigid-pile composite foundation was developed, which can take the interaction of piles, soil and cushion into account. Finally, an example was analyzed which shows that the calculated results are in good agreement with that of the test model. It is verified that the settlement calculation method in this paper is reliable.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2007年第6期965-969,共5页
Journal of Shanghai Jiaotong University
基金
国家高技术研究发展计划(863)项目(2006AA11Z104)
关键词
刚性桩复合地基
沉降计算
剪切位移法
rigid-pile composite foundation
settlement calculation
shear displacement method
