研究目的:为了对上硬下软双层地基土体穿刺深度进行研究,本文采用非线性有限元软件ABAQUS,基于土体弹塑性破坏理论与ABAQUS 二次开发技术,比较完善地分析了上部土层穿刺深度的影响因素,并给出了穿刺深度计算公式。
研究结论:研究结果表明,穿刺深度与上部土层厚度呈非线性关系,同时受土体弹性模量、非均匀性、基底摩擦等因素的影响; 上下土层强度比对上部土层穿刺深度影响较小。
Research purposes: To study the punch through deepth of two - layered soil foundation with hard over soft,the nonlinear finite element analysis software ABAQUS is adopted. Based on the elastic - plastic failure theory and secondary development of ABAQUS,the influence factors of punch through depth are analyzed in detail,and the formula of punch through depth is achieved.
Research conclusions: The results shows that the punch through depth is a founction of thickness of upper layer soil,which can be affected by elastic modulus,nonhomogeneous and friction of footing. The strength ration of soil can affect the ultimate bearing capacity of two - layered soil foundation greatly,but not the punch through depth.