A Comparative Study On Soil Foundation Reinforcement Methods For The Ends Of Shield Tunnel Entry And Exit In Clay Layer

This paper makes a comparative study of the common reinforcement methods for the end soil of clay stratum.Using PFC particle flow software,Analysis of the Reinforcement Scheme of End Soil.The failure state of soil is reflected by the ball.The main research contents of this paper are as follows:(1)Three-axis experiments are simulated by PFC3 D software.The displacement of wall is realized by servo principle.(2)Conducting indoor triaxial experiments.The physical and mechanical properties of soil are obtained.Through numerical simulation,the relationship between the particle parameters and the macroscopic quantity of physical model is obtained.When the bond strength is 10 pa,the mechanical properties of the simulated soil and the actual soil are similar.(3)Using PFC particle flow software to establish the end model.Monitoring the position and mechanical properties of the ball.Analyzing the different reinforcement schemes,The effects of different reinforcement schemes and failure modes of soil are obtained.(4)Establishing indoor model tests.Use image recording to reinforce the effect.Comparing with the numerical simulation scheme.(5)Comprehensive comparison.The reinforcement effect of five reinforcement schemes is discussed.It is concluded that under the same soil condition,the equilateral triangular pile arrangement with high pressure jet grouting pile has the best reinforcement effect.The deformation and displacement of soil are small.High-pressure rotary jet grouting pile and plain concrete pile have the advantage of economic reinforcing.The reason why it is widely used in engineering practice is explained.