Research On Vertical Bearing Capacity Tests And Settlement Calculation Methods Of Super Long Bored Pile

With the rapid development of the national economy,pile foundation as a basic form has been more and more widely used in engineering practice.The design of most Bridge engineering use large-diameter super long bored piles as its basic form.However,due to the complexity of pile foundation and soil heterogeneity,today there is still not a very accurate theory reasonablely determined the bearing capacity and deformation of a pile foundation.At present,the most direct and reliable way to determine the vertical compression of asingle pile ultimate bearing capacity is still vertical compression static load test.The paper makes the overview of domestic and foreign study information on the carrying capacity of vertical pile foundation as the basis,combinig paragraph of Nenjiang-river Bridge project on QiBai highway from DaXing to AiLunSuo,developes the static pile load test program and makes the actual observation of the embedded components at the scene.Through the collation and analysis of test data,systematically studies the mechanism of force at the time of a vertical force loaded on a pile.The paper uses the load transfer method,shear displacement method,standardized method to calculate the settlement of the test piles,Through comparison and analysis,the method of load transfer is in line with the test results,so it is suitable for super long bored piles' settlement calculation.The research results of the paper verifies the reliability of the pile foundation's design of Nenjiang river Bridge project on QiBai highway from DaXing to AiLunSuo.It also provides a useful method of large-diameter bored piles for the settlement calculation.