深置矩形刚性基础承载特性的理想弹塑性分析  

Perfect elastoplasticity analysis of load-carrying behavior of deeply embedded rectangular rigid foundations

作　　者：洪鑫[1] 雷国辉[1] 施建勇[1] 

机构地区：[1]河海大学岩土工程研究所,江苏南京210098

出　　处：《岩土力学》2004年第9期1379-1384,共6页Rock and Soil Mechanics

基　　金：教育部留学回国人员科研启动基金

摘　　要：当前主导控制变形的基础工程设计方法,必然要求合理地计算基础的荷载与位移关系。针对这类问题,现存的许多基于线弹性理论的解答或计算图表的作用显然是非常有限的,而复杂的数值方法又不便于工程应用。为分析深置矩形刚性基础的承载特性,笔者利用 Mindlin 位移解,考虑地基土的有限压缩层深度,提出了一种简单的理想弹塑性计算方法,用于分析基础的沉降、基底的压力分布、基础的荷载-沉降关系及其影响因素。结果表明,矩形刚性基础的埋置深度在适当的范围内能有效降低基础的沉降;当基底土屈服时,塑性区由短边边缘向中央开展,即基底地基承载力的发挥程度是不一致的。The current prevailing serviceability limit state method of foundation design necessitates reasonable calculation of the load movement relationship of the foundation. Many existing solutions and calculation charts and tables based on the elasticity theory are obviously of very limited use for such problems, and sophisticated numerical analysis may be inconvenient for engineering applications. In order to investigate the load-carrying behavior of deeply embedded rectangular rigid foundations, a simple perfect elastoplasticity calculation method is proposed using Mindlin's displacement solution and taking into consideration of a finite compressible layer of ground soil. The proposed method is used to analyze the foundation settlement, the contact pressure, the load-settlement relationship of the foundation, and their influencing factors. It is shown that over a suitable range the embedment depth of the rectangular rigid foundation effectively reduces the foundation settlement. At yielding of the ground soil beneath the foundation, plastic zone develops from the edge to the center of the foundation. This means that the mobilization degree of the load-carrying capacity of the ground is inconsistent.

关 键 词：矩形刚性基础 承载特性 理想弹塑性 MINDLIN位移解 有限压缩层 

分 类 号：TU473[建筑科学—结构工程]