Research on Vertical Bearing Capacity of Bridge Pile Foundation under Complex Geological Condition
It is very important to explore the vertical bearing capacity characteristics of bridge pile foundation under complex geological conditions to ensure the safety and stability of the bridge.Based on a bridge pile foundation construction project,the loading test is conducted on the pile foundation in the project,the load-displacement curve of the test pile during loading and unloading is analyzed,the three-dimensional pile foundation analysis model is established by numerical simulation method,and the pile axial force,pile side friction and pile settlement law in the loading process are analyzed on the basis of the basic agreement between the simulation data and the test data.The results show that the ultimate bearing capacity of the test pile is 38 629 kN,which meets the design requirements,after the loading is terminated,the maximum upward displacement of the test pile is 10.76 mm,and the maximum downward displacement is 7.07 mm;with the increase of the pile depth,the axial force of the pile decreases gradually and the decrease amplitude increases;under different graded loads,the maximum value of pile side friction appears at the depth of 35 m.
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