软黏土中深埋矩形基础极限承载力探索

Bearing Capacity of Rectangular Footings in Soft Clay with Deep Embedment

主要研究了软黏土中矩形基础宽长比、深宽比对极限承载力的影响。研究范围涵盖薄板(宽长比低至0.025)在高深宽比(深宽比达150)时极限承载力。工作基于小变形有限元方法。首先通过与已有相关研究成果比较,验证采用的有限元模型可靠性。在此基础上,计算不同宽长比及不同深宽比矩形基础在软黏土中的极限承载力。进而提炼出一个可计算不同宽长比、不同深宽比矩形基础极限承载力的简易公式。使已有的计算矩形基础极限承载力经验公式适用范围得到扩展。

This paper is concerned with the undrained bearing capacity of rectangular footings with various aspect ratios and embedment ratios in uniform clay.It covers thin plate foundations with low aspect ratios and high embedment depth with embedment ratio up to 150.The work is based on small strain finite element analysis(FEA).After verification of the FEA model against existing solutions of the bearing capacity factors of rectangular footings,a series of FEA results are obtained.Based on the FEA results,a simple formulation is proposed to calculate the bearing capacity factors for rectangle footings with different aspect ratios in any embedment depth,extending the existing solutions to cover a wider ranges of footing aspect ratios and embedment ratios.