Dissertation > Excellent graduate degree dissertation topics show

Study on Numerical Simulation of Mechanical Response and Creep Characteristic for Coal-Pillar in Thick Seam Mining

Author: ChenHui
Tutor: WangXuChun
School: Qingdao Technological University
Course: Geotechnical Engineering
Keywords: Mechanical response Flowing deformation Time effect FLAC3D Long-term strength Creep characteristic Stability
CLC: TD32
Type: Master's thesis
Year: 2008
Downloads: 158
Quote: 0
Read: Download Dissertation

Abstract


The underground mining is an important way to acquire the mineral resources in our country currently. The mining area of the environment is constantly changing, increasingly mined-out area, and the stability of stope is more important with the face of mining completed in the deep coal mining. The coal-pillar is a pivotal stope unit and it supports stope, so, it not only ensures stability of roof beam and wall rock, but also stability coal-pillar increases the mining rate of coal body obviously. Among them, the coal rock body flows is to determine the long-term pillar of strength, is fundamental evaluation of mining an important basis for long-term stability. The paper carried out the research deeply and systematicly on the creep characteristics of the coal rock in the thick seam of coal mining, long-term strength and damage features, and the coal rock structure and confining pressure changes and time dependence. The specific contents are as follows:（1） In the coal-pillar mechanical response, summarized the various basic theories of the coal-pillar strength and deformation law, comprehensive analysis the coal-pillar destruction mechanism, getting that the coal-loading and strength is the coal-pillar stabilities analytical foundation.（2） Evolution through coal theoretical study, it is determined for the deep coal seam to adopt the improvement Burgers model-cvisc model as the coal-rock creep model. Preliminary study on the time factor to the stability of coal-pillar.（3） With the main 3-thick coal seam in Xinglong Coal Mine as the study object, using FLAC3D achieve the numerical simulation of the mining process, keep the view ground announce to public the distribution condition of the cover and coal-pillar, in displacement, stress and knuckling under area. Through summary of stress and strain law of the coal-pillar and analysis of long-term stability, reproduction the process of deformation and damage of the cover rock and coal in mining area, while initially discussing the destroy characteristic of the coal-pillar at the same time.（4） According to creep theoretical analysis, build the corresponding creep model, combining the experimental results identified the coal-rock creep parameters. And then using numerical simulation of coal to accept the long-term strength index and evaluate it.（5） Through study the creep characteristic of coal-pillar, select the stress, strain and state zone for the evaluation, determine the stability of coal-pillar in distroct, providing guidance and protection bases for coal mining and mining stope stability after maintaining.In fact, the deformation of mining rock, breaking, moving entire dynamic mechanical process is one kind of the flowing deformation learning phenomenon having a characteristic alone completely. And be only analyzing the various deformation of stope from elastic-plastic aspect currently still. This paper passes to treat the coal-rock as visco-plasticity, making use of numerical analysis to get necessary conditions and parameters with keeping coal-pillar stability, providing theory and actuality directive function for the long-term stability analysis in subsidence area.

Related Dissertations

  1. The Study on Structural Calculation and Analysis Method of Lattice-type Crane with Variable Cross-section Boom,TH21
  2. Power System Dynamic Voltage Stability Simulation Study Based on Precise Integration Method,TM712
  3. Synthesis and Application of the chloro- methoxy fatty acid methyl esters,TQ414.8
  4. Analysis of the Impact of Tailings Dam Stability under Seepage Role,TV649
  5. Characterization and Properties of capsaicin / CD system,TQ450.1
  6. Preparation and Properties of lead-free glass powder,TQ171.6
  7. Self-reported Psychosomatic Pathological Status among Adolescent Students: a School-based Cohort Study,B844.2
  8. The DNA Cloning and RNA Interference of Some Functional Genes in Laodelphax Striatellus (Fallen),S435.112.3
  9. The Reform and Study Ofsite-directed Mutagenesis of Acid Xylanase XynⅢ from Aspergillus Niger,TQ925
  10. The new central collective leadership of thinking about social stability,D61
  11. High hydrothermal stability of nickel-based catalyst and hydrogenation of butyne diol,TQ223.162
  12. Basal Heave Stability Analysis of Deep Founation Pits in Anisotropic Soft Clays,TU447
  13. Stability analysis of Pantograph Equations,O241.8
  14. Synthesis of 2-methyl-4-methoxylaniline by Pt/C Catalytic Hydrogenation,TQ246.31
  15. Mixed H2/H∞ Optimal Control Problems for Singular Systems,TP13
  16. Robust H_∞ Control for Nonlinear Descriptor System Based on LMI Methods,TP13
  17. The Evaluation on Stability, Individual Differences and Gender Correlation with Liver Cancer Related MicroRNAs,R735.7
  18. Research and Simulated Vehicle Stability Control on Turning and Braking Maneuvers,U463.5
  19. Synchronization of the Four Unbalanced Rotors in a Non-Resonant Vibrating System,TH113.1
  20. Self-Synchronization of Two Coupled Exciters in a Vibrating System of Spatial Motion,TH237.6
  21. Study on the Stability and Technology of the Catalyst for Heavy Aromatics Hydrogenation,TE624.4

CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Rock pressure and rock movement
© 2012 www.DissertationTopic.Net  Mobile