Experimental Research on Bearing Capacity of Cast-in-place for Large-diameter and Rock-socketed Bridge Pile with Self-balanced Method

According to the project of No.1 bridge in Tianshui economic clevelopment zone,the bearing capacity test for 3 bored piles(diameter is 1.2 m,length is 35 m,47 m and 35 m,respectively) is carried out by using self-balanced method.On the basis of collecting and analyzing the test data,the bearing behavior of foundation pile and pile side resistance features are studied to obtain the necessary technical data,verify the design parameter and provide reliable parameters for pile design of the similar project in this area.The result indicates that the self-balanced method is an effective and simplified testing method in pile foundation static test,and it has attained excellent engineering effect and can be used widely in the similar project.