Numerical Simulation And Analysis Of Bearing Capacity Of Bridge Rock Socketed Pile Foundation

Rock-socketed pile is a bored pile with a considerable length embedded in hard bedrock at the end of the pile.The characteristic of rock-socketed pile is that the bearing capacity of rock-socketed pile is large under vertical load,and the settlement is relatively small in the foundation,which is suitable for many kinds of foundations,so designers usually consider the type of rock-socketed pile when designing pile foundation.However,the mechanical characteristics of rock-socketed pile are more complicated,and there are many kinds of design specifications.The design methods and testing standards are not different,so the designers often adopt the idea of insurance in the design.In turn,it creates unnecessary waste in the economy.In response to the national proposal to save resources,protect the environment,high With the call of quality engineering,it is very important to study the bearing capacity of rock-socketed pile under vertical load.Based on the theoretical basis,the Finite element numerical simulation software of geotechnical engineering is used to focus on the cross-section of the pile bottom of rock-socketed pile.Numerical simulation and comparative analysis on the bearing capacity of rock-socketed pile are made in the aspects of hole expansion at the bottom of pile and embedding depth under the same square concrete.The main conclusions obtained in this paper are as follows:1.When the ratio of pile bottom diameter to pile body diameter is less than 2.5,the bearing capacity can be increased by increasing pile bottom diameter when the ratio of pile bottom diameter to pile body diameter is less than 2.5,and when the ratio of pile bottom diameter is greater than 2.5,the bearing capacity can be improved by increasing pile diameter.2.Under the condition of selecting the pile with equal section,the bearing capacity of the pile can be increased by the belled bottom,and the method of belled bottom is very effective.When the displacement is the same,the bearing capacity of pile decreases with the increase of the depth of the reamed base,and the decreasing range increases with the increase of the depth.In the allowable settlement range,the bearing capacity of pile increases with the increase of the embedding depth of the constant cross-section,which plays a great role in the lateral resistance between the pile and the rock layer at the bottom of the pile.3.With the decrease of the embedded depth or the ratio of the embedded depth to the pile diameter,the maximum external load of the four piles of the same square concrete pile can be reduced with the decrease of the embedded depth or the ratio of the embedded depth to the pile diameter.The greater the reduction in the embedded depth,the greater the reduction of the bearing capacity.