Dissertation > Excellent graduate degree dissertation topics show

The Characteristics of Surrounding Rock Mass Plastic Zone to Uncovering Coal in Crosscut and Study on of Gas Extraction Drilling Parameters

Author: GuDaSheng
Tutor: XianXueFu
School: Chongqing University
Course: Safety Technology and Engineering
Keywords: Coal permeability uncovering coal in crosscut gas pressure gas extraction
CLC: TD712.6
Type: Master's thesis
Year: 2011
Downloads: 140
Quote: 0
Read: Download Dissertation

Abstract


Taking the uncovering coal in crosscut of nan tong No. 6 as the experiment specimen,through laboratory experiments by field sampling, the rules how the effective stress and different gas adsorption influenced the coal permeability were found out. At the same time through the numerical analysis and theoretical analysis,fracture of uncovering coal in crosscut regions were predicted, and established the finite deformation of the coal rock of solid -gas coupling model. Through careful analysis of drilling drainage characteristics and the law of gas flow, and some laboratory experiments ,the change law of the parameters of methane extraction were educed。To sum up, the main research results and conclusions of this paper are as follows:①Through laboratory experiments by field sampling ,the rules how the effective stress and different gas adsorption influenced the coal permeability were found out. The coal permeability and effective stress has a negative correlation. The reason is that the effective stress increasing compresses the coal rock crack so that the seepage channels are reduced. The coal matrix will swell by adsorbing gases so as the openings of fracture become small, and then the coal permeability is lowered.②Giving the rock failure criterion, and applying to the coal rock specimen validation, obtaining the fracture failure criterion of coal. Introducing the rock mass stability coefficient R, when R≥1, rock is not destroyed,through numerical simulation of uncovering coal in crosscut, research results are as follows: the region of fracture of uncovering coal seam in cross-cut on the Formation is a dynamic evolution process,when the distance between working face of rock tunnel and coal seams becomes closer and closer, the fracture area becomes larger and larger. The working face will have the sign of destruction when the distance between the rock tunnel and working face coal seam become very closer.③Established coal in gas-solid coupling model which reflects the change of porosity and permeability, by analyzing the model to educe an effect regularity of gas pressure, porosity and permeability in the gas extraction surroundings, obtained optimal design parameters of gas extraction.

Related Dissertations

  1. Hongyuan Coal Mine Methane Emission Forecast and Prevention Research,TD712
  2. Gas Geological Characteristic Research in Dayaogou Mine,TD712
  3. Technology Application of Deep Hole Presplitting Blasting to Improve the Efficiency of Gas Extraction in Liyazhuang Mine,TD712
  4. Buffer Inclination Multi-seam Mining Under the Protective Layer Design of Pressure Relief Gas Drainage,TD712.6
  5. Thermodynamic Properties of Anisotropic Fermi Gases in Confined Space,O414.1
  6. Research on Gas Occurrence and Emission of Sanjiazi Coal Mine,TD712
  7. Study on Outburst Prevention Mechanism and Injection Parameters Optimization of Hydraulic Extrusion,TD713
  8. Protective layer on the mining of coal and rock deformation and pressure relief gas drainage technology,TD712.6
  9. Research and Application in Gas Production with Foam Draining Water,TE377
  10. Study on Improving Gas Recovery of Songyuan Natural Gas Purification Plant,TE377
  11. Research of Built-in Gas Stove Burner’s Structure and How to Improve the Thermal Characteristics,TS914.232
  12. Underground Drainage with Gas Atomization Process Research,TE377
  13. Study on Pressure-transform Tumble Curing Technology in Meat Processing,TS251.4
  14. Study on Performance of Zigzag Rotating Bed,TQ05
  15. Aspen shavings laminated timber manufacturing process Factors,TS653
  16. Study on Methane Controlling Technology of the Goaf in Fully Mechanized Caving Face Characterized by Coal Seam of High-Content Methane and Easily Spontaneous Combustion,TD712
  17. Pressure Relief Functional Principle of Stope Underlying Coal-Rock Mass and Application in Gas Extraction of Protected Coal Seam,TD712.6
  18. Research on Faster Prediction Technology of Outburst Risk When a Cross-Cut or Shaft is Uncovered under Complicated Geological Conditions,TD712
  19. Study on the Scope of the "Three Zones" of Gas Pressure Relief and Extraction in Coal Seam Group Mining,TD712.6
  20. Fabrication and Characteristics of TiB2-Al2O3 Multiphase Ceramics,TQ174.75
  21. The Mechanism Research of Coal Rock Mechanics in Vertical Shaft Coal-opening Process,TD713

CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Mine Gas > Gas Drainage
© 2012 www.DissertationTopic.Net  Mobile