Dissertation > Excellent graduate degree dissertation topics show

Numerical Simulation with FLAC3D on the Reasonable Value of Lime-soil Cushion Thickness, Cohesion and Friction Angle of Rigid Pile Composite Foundation in Collapsible Loess Areas

Author: LiuWenBin
Tutor: ZengGuoHong
School: Taiyuan University of Technology
Course: Geotechnical Engineering
Keywords: CFG pile composite foundation lime-soil cushion numerical simulation cushion thickness cohesion angle of internalfriction reasonable value
CLC: TU473.1
Type: Master's thesis
Year: 2012
Downloads: 183
Quote: 0
Read: Download Dissertation

Abstract


With the continuous improvement of composite foundation theory, the rigid-pile composite foundation in collapsible loess regions has been widely applied, specially the CFG (Cement Fly-ash Gravel) pile composite foundation, because the CFG pile has the effects of pile body and replacement. The CFG pile together with the soil between piles and cushion can form a composite foundation, the cushion design is the core content of composite foundation. The cushion has the effect of guaranteeing pile-soil interaction, adjusting the load distribution ratio and the horizontal load between pile and soil, reducing stress concentration at the base bottom. The researchers have a more profound understanding of behavior and failure modes of cushion, but the reasonable value of lime-soil cushion thickness, cohesion and friction angle of rigid pile composite foundation in collapsible loess areas has been up in the air. Based on the existing research, the numerical analysis software FLAC3D was used in this paper to establish a calculation model of lime-soil cushion of CFG pile composite foundation, to study the effect of thickness, cohesion and angle of internal friction of lime-soil cushion on the stress ratio of pile and soil, pile stress, the settlement of composite foundation and pile penetration in different deformation modulus of soil between piles. The conclusions can be drawn out as follows and the reasonable values of three parameters of lime soil cushion are given.(1) The lime-soil cushion has effects of adjusting the load distribution ratio and reducing the stress concentration of pile top.(2) The thickness of lime-soil cushion has more great influences than the cohesion and angle of internal friction of lime-soil cushion have on the stress ratio of pile and soil, pile stress, the settlement of composite foundation and pile penetration.(3) The reasonable value of lime-soil cushion thickness is related to the value of deformation modulus of the soil between piles. The soil is more softer, and the reasonable value of lime-soil cushion thickness is more larger.(4) In collapsible loess regions, when using lime soil cushion CFG pile composite foundation, cushion thickness is proposed from200to 300mm, cohesion and angle of internal friction of cushion from20to30kPa and21to30degrees.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  6. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  7. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  8. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  9. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  10. Numerical Simulation of Biomass Direct Reburning,TK16
  11. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  12. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  13. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  14. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  15. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  16. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  17. The convergence of mathematics teaching in primary and secondary schools under the new curriculum with the problem representation,G633.6
  18. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  19. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3
  20. Analysis of the Impact of Tailings Dam Stability under Seepage Role,TV649
  21. Research for Social Interaction of Interest-related Groups,C912

CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
© 2012 www.DissertationTopic.Net  Mobile