Comparative Study on Determining Method of Vertical Bearing Capacity of Single Bored Pile in a Project in Wuhan

based on the existing inspection technical specification of building piles and the pile foundation engineering manual,The vertical bearing capacity R_a of single pile of bored pile is determined by vertical ultimate bearing capacity Q_u of pile or settlement of pile top s.The determination method of vertical ultimate bearing capacity Q_u of single pile is mainly based on vertical load-settlement(Q-s) curve,settlement-time logarithm (s-lg t) curve and settlement-vertical load logarithm (s-lgQ) curve.The value of pile top settlement s is determined by pile foundation engineering manual and design requirements.Through these four methods,there are differences in the determination results of vertical bearing capacity of single bored pile.According to the inspection technical specification of building piles and the pile foundation engineering manual,analyzing and comparing the different vertical bearing capacity R_a of single pile determined by four methods,a method is proposed of judging the vertical bearing capacity of single bored pile by using(Q-s) and(s-lg t) curves,which provides a reference method for determining the vertical bearing capacity of similar bored pile in the future.