Abstract：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．
张其一，王青华，王琦. 上硬下软双层地基上条形基础穿刺深度研究[J]. 铁道工程学报, 2011, 28(11): 36-39.
ZHANG Qi － yi，WANG Qing － hua，WANG Qi. Study on Punch through Depth of Two － layered Soil Foundation under Strip Footing. 铁道工程学报, 2011, 28(11): 36-39.
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2011, Vol. 28 
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