关键词: 极限承载力, 载荷试验, 三维有限元

Abstract: Based on the cited data of loading tests and calculation, 3-D finite element analysis is conducted with the software ABAQUS. Comparison of 3 theoretical prediction formulas for ultimate bearing capacity is carried out, which are Vesic's, Hansen's and Meyerhof's. This paper discusses the impact on prediction results of foundation size, foundation embedded depth and soil properties. The results show that: (1) The prediction errors of these three formulas are relatively low when they are used for shallow foundation (D<B) of cohesive soils. However, none of these three formulas is applicable for deep foundation (D>B) of cohesive soils. (2) For shallow foundation of cohesive soils, the ultimate bearing capacity is totally overestimated with these three formulas. In general, prediction result of Meyerhof's formula is largest, and Vesic's is closest; when the soils' properties meet the condition of φ<25° and c<20 kPa, the prediction errors of these formulas are no more than 10% generally; the prediction errors of these formulas increase with the increasing of the frictional angle and cohesion of foundation soils.

Key words: ultimate bearing capacity, loading test, 3-D finite element analysis