Analysis Of Nenjiang Bridge Cast-in-place Pile Vertical Bearing Capacity

The core problem of pile foundation design is sedimentation and bearing, two aspects. The traditional way is the destructive load testing, but the field load testing is very costly, because these testing need too much test loading, so the loading condition and the test technology is very difficult too. Based on the field testing material to determine the bearing capacity of the single pile by using the simulation analysis, how to determine the vertical bearing capacity is a problem which is worthy to attention.At present, the most reliable and direct way to determine the vertical compression of the cast-in-place pile ultimate bearing capacity is still vertical compression static load test.The paper makes the overview of foreign and domestic study information on the carrying capacity of vertical pile foundation as the basis,combinig paragraph of Nenjiang-river Bridge project on NenJiang highway from striker farm to light segment,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 landed on a pile.In order to analysis the capacity of bored piles in the Nenjiang of china, for the nenjiang bridge engineering piles, considering the lateral pressure coefficient, ABAQUS software is used to simulate interaction between pile and soil, Drucker-Prager have been adopted as the elastoplastic constitutive model of the soil by model analysis,while the elastic constitutive is used for pile and master-slave surface model is used for pile-soil contact surface, concerning the influence of initial geostress,the result is consistent with the one in real situation. In model results was analyzed on the basis of pile body Elastic modulus, pile diameter and pile end grouting effect, the pile length change the influence of pile foundation bearing capacity, which has important reference value, which under the same geological conditions of pile foundation design provides scientific basis.