Study on design method of pile foundation bearing capacity based on pile test in the Yellow River alluvial and pluvial formation

Taking aproject in Dongying as an example, and based on the test results of test piles in the Yellow River flood alluvial formation, the relation curve between the measured average value of the ultimate bearing capacity of single pile and the height of the pile bottom (which can be converted into pile length) under the condition of the same pile top elevation (-5.7 m) is set up.Analysis is made of the test pile test and the big difference (6.36%~20.19%) between the measured value and the predicted value of the ultimate bearing capacity of the single pile.The reasons and the optimal design method of pile foundation bearing capacity are introduced.According to the test results of the pile foundation, the measured value of the ultimate bearing capacity of the single pile under the same length and diameter of the pile is about 10% greater than the predicted bearing capacity, which can exploit the potential of the geological conditions, reduce the number of piles and save the cost of the project.Relevant test methods and methods of optimizing the pile bearing capacity design can provide reference for engineering design under similar geological conditions and the establishment of regional pile bearing capacity database.