Experimental study on bearing behavior of super-long bored piles in the riverside area of Yangtze River in Wuhan
In order to study the load-bearing deformation characteristics of large-diameter and super-long bored piles in the riverside area of Yangtze River in Wuhan,the test data of three bored piles with pile diameter of 1 200 mm and pile length of 57.5 m were analyzed in combination with the static load test of Wuhan Yangtze River Gate Building construction site.The results show that the load-settlement curves of the three piles are of steep descent type,the ultimate bearing capacity is 40 000 kN,and the settlement of the top of the pile is mainly caused by the compression of the pile body,accounting for more than 90％.In the sand soil layer,the pile side grouting reduces the relative displacement of the pile and soil required for the exertion of the ultimate side friction resistance.In the rock formation,the pile side friction reaches the limit value with a small relative displacement.The relationship curve between resistance and displacement of the test pile tip is shown as a double fold line model with pressure hardening.Under the ultimate load,the test piles are characterized as friction piles.The resistance at the end of the test pile is not fully developed,and the resistance at the end of the pile should be multiplied by the corresponding coefficient when calculating the bearing capacity.The test results can provide information for the project pile design,and also provide theoretical and practical reference for similar pile foundation projects in this area.
super-long bored pileultimate bearing capacityshaft frictionpile-soil relative displacementpile tip resistance
NETL
NSTL
万方数据
维普
