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Abstract Through the analysis of stress state of the soil plug，the condition of generating squeezing effect and squeezing mechanism for the process of jacked-in steel pipe is analyzed. The results show that：the condition of generating squeezing effect is that the stress at the bottom of the soil plug is greater than the bearing capacity of foundation at the end of the steel pipe；the jacked-in steel pipe can be regarded as displacement pile，non-displacement pile and incomplete displacement pile according to the relevance of the stress at the bottom of the soil plug and the bearing capacity of foundation；the extruding ratio can be used as the assessing index for the squeezing degree of the incomplete displacement pile. Besides，theoretical calculating methods for the stress at the bottom of the soil plug and bearing capacity of foundation at the end of the steel pipe have been analyzed and summarized. At last，through the measured data and implement result of the construction of the protective steel pipe for the bored pile，the rationality and practical applicability of the theoretical analysis for the jacked-in steel pipe have been demonstrated.
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Received: 22 May 2012
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2013, Vol. 32 
