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Experimental Study on Vertical Bearing Behavior of Super-long Post-Grouting Cast-in-Place Bored Pile

Wang Zhongfu1,2,3,Liu Handong2,He Siming1,Huang Zhiquan2(1.Institute of Mountain Hazards and Environment,Chinese Academy of Sciences & Ministry of Water Conservancy,Chengdu 610041,China;2.North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011,China;3.University of Chinese Academy of Sciences,Beijing 100049,China)  
The commonly used method to determine the vertical bearing capacity is in-situ load test.Based on the static load test and axial stress measure data,the performance of bearing capacity,axial force,pile side resistance and tip resistance is analyzed.The results show that the axial force decreases with depth,and gradually increases with increasing load under vertical load.The super long post-grouting pile has the characteristics of the friction pile,its Q-S curve has no obvious breaking point and the load delivery depends mainly on the side friction;the pile side resistance and tip resistance have interaction and act non-synchronously.Based on calculation of bearing capacity,the correction of factor for side friction and tip resistance is presented,which provides a useful reference for pile foundation design.
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