Study On The Influence Of Deep Foundation Pit With Convex Angle On Supporting Pile And Surrounding Environment

In the context of the rapid development of my country’s urbanization process,the requirements for architectural space are not only higher and higher,but the demand for underground space is becoming more and more urgent.Therefore,a large number of deep foundation pit projects have also appeared.The complexity of deep foundation pits with external angles also brings a lot of technical problems to the engineering design and construction.How to control the supporting piles of special-shaped deep foundation pits with external angles and their surrounding environment Displacement has become an important issue.This article will take an example of a deep foundation pit project with a sun angle as the background,and analyze the impact of the deep foundation pit excavation process based on the project site monitoring data and combined with numerical simulation.The influence of adding channel steel outside the foundation pit and the distance between the external angle and the external angle on the deformation of the deep foundation pit is discussed.This paper conducts statistical analysis on the results of the numerical simulation of MIDAS GTS/NX finite element software,and compares and analyzes with the monitoring data.The conclusion is as follows: The horizontal displacement of the supporting structure pile shows a small bow at both ends and a large middle.,The displacement at the connection node between the internal support concrete beam and the pile is smaller than other measurement points,and the horizontal displacement of the pile at the sun corner of the deep foundation pit is not the largest;the internal support beams with the largest axial force in the three-layer internal support appear On the second floor;the settlement of adjacent buildings and the ground surface increases with the progress of excavation.Due to the pit corner effect,the ground settlement at the monitoring point at the pit corner is smaller than that of other locations.The application of internal supports will cause displacement of the surrounding environment.Inhibition.Although there is a certain deviation between the numerical simulation result and the actual monitoring value,the development trend of the displacement curve is consistent.The addition of channel steel has a significant effect on reducing the deep horizontal displacement of the supporting pile and the settlement of adjacent buildings.The channel steel has a good reinforcement effect on the supporting structure of deep foundation pits with positive angles under the present geological conditions.In the actual project,the distance between the brace and the external corner of the special-shaped deep foundation pit should be strictly controlled to avoid hidden dangers to the safety of the project.