Dissertation > Excellent graduate degree dissertation topics show

Stability Analysis of Soil Body in Slurry Shield Tunneling and Test Research

Author: WeiLiangWen
Tutor: ZhangQingHe
School: Tongji University
Course: Structural Engineering
Keywords: Slurry shield tunnel Face stability Mud Wrap Grout Out of the hole Tunnel floating construction control technology
CLC: U455.43
Type: PhD thesis
Year: 2007
Downloads: 867
Quote: 7
Read: Download Dissertation

Abstract


With the development of urbanization, it is necessary that traffic tunnels like subway become more and more important because of increasingly crowded traffic, and modern city requires higher demands on underground traffic tunnels not only in magnitude and also in quality. There consists of many problems in shield tunneling especially slurry shield tunneling contrast to the fast development and great demands of shield tunnels, in which the most important is the unstable condition of soil body. So it is of practice demand and of great theoretical significance to explore the stability rule of soil body of the slurry shield tunneling.Bases on Project East Fu-xing Road tunneling, Project Xiang-yin Road tunneling and Project South Sitsang East Road tunneling, the rules of face stability , the soil collapse after the shield tail pulled out of segment and the tunnel floating, stability of the soil body around starting shaft are investigated. The major works and results of this dissertation are as follows:(1) The microcosmic mechanism of slurry balancing face, the formation factor and course of filtercake are analyzed; Based on the unstable face forms, the ameliorated wedge model is set up. The ameliorated wedge model can synthetically consists of influences of shape of the sliding face, slurry penetrating face soil and excess pore pressure. Parameter sensitivity is analyzed about the ameliorated wedge model.(2) It is found that the polymer and the Mixed Metal Hydroxide could depress the dispersibility of the clay, reinforce the stability of the sand and improve the characters of the slurry, then developed the Polymer-MMH Shield Slurry through material choice test, serosity-make ability test, anti-pollution test and restraining dispersive drillings recycling test. Used in Project East Fuxing Road Slurry Shield Tunneling, a filtercake with low porosity, compact and larger thickness was made. So the Polymer-MMH Shield Slurry System have the good utility, and can be extensively applied in the construction of the large-diameter slurry shield tunnel.(3) 10 synchronous grout proportioning tests are carried on, and tests on slump, consistency, density, bleeding rate, shrinkage ratio and pH value. According to this 3 synchronous grout proportions with good groutability are selected. After that, simple shear tests; consolidation tests are carried to determine the cohesion c, internal friction angleφ, the compression index aν12 and modulus of compressibility Es1-2, and also uniaxial compression tests about the grout with curing age of 3d、7d、28d are carried to determine uniaxial compression strength at different curing age. Based on results of the first phase, tests are carried to determine every index of the grout with additives, and the better synchronous grout proportion is to be applied in the field.(4) The reasons of soil over shield tail losing stability and influencing factors of slurry shield tunnel floating are analyzed. A simplified elastic base beam for floating of slurry shield tunnel is put forword, and the longitudinal rigidity, foundation modulus and buoyancy to tunnel are determined respectively. It shows good effect with the elected grout to anti uplifting contrasting to the monitoring data in Project Xiang-yin Road tunneling. Lastly some effective meseases are put forward to control the floating of slurry shield tunnel.(5) The reinforcement principle, reinforcement range and common reinforcement methods are introduced briefly. It is to be analyzed the strength and stability demands of the reinforced soil body with thin board strength theory, slide theory and limit balancing theory, and checking computations are carried on a domestic slurry shield tunneling project, the computation results are compared to the FEM results.

Related Dissertations

  1. Professor Kong Guangyi academic thought Qing Xuan main Treating children cold cough,clinical research and clinical experience,R249.2
  2. Application of ANN for the Prediction of Water Content in Geophysical Exploration,P641.7
  3. New cyclone cleaning airflow inside the system state research and materials,S225.3
  4. The Study on the Stress Mechanism Which the Application of High Strength Micro Expansion of Prestressing Anchor Technique in Rock Slope,TD353.6
  5. Nonlinear Finite Element Analysis on Shear Behaviors of High-Strength Reinforced Concrete Masonry Shear Wall,TU364
  6. Research on Online Active Measurement of Diameter in Deep Processing,TP212
  7. Research on the Properties of Super Early-Strength Cement-Based Grout,TU528
  8. Experimental Study on Seismic Behavior of Pre-cast Reinforced Concrete Shear Walls,TU352.11
  9. Analysis and Control Teehnology Research on the Stability of the Tunnel Face,U455.4
  10. Mechanical Properties of Ramie Fiber Woven and Textile Structural Composites under Multi-dimensional Loadings,TB332
  11. Weight Spectrum Based Optimal RCPT Code Design and the Performance Analysis of Turbo Codes,TN911.2
  12. Acupuncture Kei Doors, Air Sea Cave Treatment of Neurogeni Curinary Retention of Clinical Research,R246
  13. Thick-walled annular sealing honeycomb seals and seal hole blade vibration characteristics and inspiratory inhibition studies,TB42
  14. The Clinical Research on Hhcy of the Risk Factor for CVD with Acupuncture Theropy,R246
  15. Observation of the Immediate Effect to the ST-T Segment on EKG by Electroacupuncturing "Lingtai" and "Shendao" Points in Inferior and Lateral Heart Wall of Coronary Heart Disease,R246
  16. Transumbilical hole Clinical application of laparoscopic techniques,R657.4
  17. Comparation of the Effect between Brilliant Blue G and Indocyanine Gren Assisted Internal Limiting Membrane Staining for Idiopathic Macular Hole,R779.6
  18. Investigation of Traumatic Retinopathy with Spectral Domain Optical Coherence Tomography,R774.1
  19. Design and Development for Deep-Fertilization Pricking Hole Mechanism of Whole Elliptical Gears,S224.21
  20. Point crab farming model proposed health research,S968.251
  21. Two-hole eight -lane highway tunnels with small spacing distance influence model test and field test,U459.2

CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Shield Law ( full- face excavation )
© 2012 www.DissertationTopic.Net  Mobile