�������ɻ����ش��ź������չ�����, ����ֱ��2 m����50 m����׹�ע׮Ϊ����, ��׮����������������ƽ����ԡ�ѡȡ����5-1#��6-2#��6-3#��׮ʵ������, �Ӻ���-������ϵ��׮�IJ�Ħ�����ֲ���׮-�������λ�ƹ�ϵ���������ķ��ӵȷ���, �����˴�ֱ���г���ע׮�ij������Ժͺ��ش��ݻ����Լ�Ӱ����������Ե����ء��������: 5-1#׮���޳�����Ϊ68 917 kN, 6-2#׮���޳�����Ϊ62 316 kN, 6-3#׮���޳�����Ϊ75 234 kN��

In construction of the main pier of Songhua River super large bridge channel in Lanqi, the bored pile with 2 m in diameter by 50 m long is used as base for self-balancing testing the bearing capacity of pile foundation. Collecting the experimental data of 5-1#, 6-2#, 6-3# test piles, the authors analyze the bearing characteristics and load transfermechanism of large-diameter and mid-long bored piles and the influencing factors on bearing characteristics, in the aspects of load-settlement relationship, distribution of side friction of pile, pile-soil relative displacement and performance of tip resistance. The results show that ultimate loads of 5-1#, 6-2#, 6-3# are 68 917 kN, 62 316 kN and 75 234 kN, respectively.

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