Research On Stress And Deformation Mechanism Of Inclined Pile In Foundation Pit Support

Nowadays,due to the needs of construction technology and engineering,the probability of inclined piles appearing in construction projects is getting higher and higher,such as foundation pits,wharfs,bridges and other projects have been widely used.In the past,due to the constraints of construction technology and related conditions,the domestic foundation pit row pile support has always adopted a vertical form.However,related research shows that the inclined supporting structure is more conducive to controlling the deformation of the soil in the foundation pit.The inclined pile has the advantages of effectively reducing the bending moment of the pile body and controlling the displacement of the soil.Although the inclined pile technology has been more and more popularized and applied,there are still many unclear and need to improve the basic theoretical research of inclined supporting structure.In this paper,based on the excavation construction process of the foundation pit project supported by inclined rows of piles,through the indoor model test combined with the numerical simulation method of the finite element software Midas GTS NX,the design of the foundation pit excavation model working conditions of multiple inclined angle supporting structures is designed Simulate the deformation process of the soil and supporting structure of the foundation pit during the excavation of the foundation pit.Through the analysis of the test data and numerical simulation results,the mechanical deformation performance of the inclined pile is studied.The main work of this article is briefly described as follows:(1)Review and summarize the literature about inclined piles at home and abroa d,draw on research methods and numerical simulation establishment methods,and formulate reasonable research methods through comparison.(2)Carry out indoor model test of inclined piles,introduce relevant test theory and test plan,including model composition,required equipment and related data acquisition instruments,etc.The data of excavation depth-supporting structure deformation and excavation depth-earth pressure of supporting structure measured in the experiment are analyzed to study the deformation mechanism of inclined piles during the excavation of the foundation pit at different tilt angles.(3)Using finite element software for numerical simulation,first establish a model consistent with the size and parameters of the laboratory model test materials to verify the reliability of the finite element model parameters in this study;through the verified parameters,establish a variety of different inclination angles The foundation pit model of single-row inclined supporting piles simulates the ex cavation process of the foundation pit,analyzes the calculation results,and compares the horizontal displacement of the top of the inclined pile,the lateral displacement of the pile body,and the bending moment of the pile body at different inclination angles(0 ° ～ 15 °),Soil pressure on the side of the pile,soil displacement of the foundation pit and other parameters,to study the law of deformation and deformation of inclined piles.(4)Calculate the lateral deformation of the inclined pile theoret ically,and use the "m" method to calculate the pile top level of the inclined pile;according to the theoretical calculation formulas of Rankine earth pressure and Coulomb earth pressure,the lateral soil pressure of the inclined pile And the internal for ce of the pile body is calculated and analyzed.