Dissertation > Excellent graduate degree dissertation topics show

Study on Structure Characteristics of Overlying Strata in Shallow Coal Seam under Longwall Mining

Author: RenYanFang
Tutor: QiQingXin
School: CCRI
Course: Mining engineering
Keywords: Shallow coal seam Overlying strata structure Pressure arch Numerical simulation Rock pressure
CLC: TD32
Type: Master's thesis
Year: 2008
Downloads: 450
Quote: 19
Read: Download Dissertation

Abstract


Aiming at the actural situation of shallow coal seam mining in ordos region, relying firmly on the subject of overlying strata structure characteristics and based on the geological survey for shallow coal seam and the mine pressure observation in the experiment face, the thesis analyzed the forms and movement characteristic of overlying strata structure and investigated the key factors on overlying strata structure stabily in shallow coal seam through the method that combined theory analysis with computer numerical simulation. Combining with the mining practice of 1203 and 20601 faces in daliuta mine, the project proof analysis was carried out at last.The conlusions indicated that whether the pressure arch structure could form in the overlying strata of shallow coal seam under longwall mining and keep the structure stable was the key factor on shallow coal seam definition. The key influencing factors on shallow coal seam mine pressure and overlying strata structure stability were mining height and face length. The critical height of "pressure arch" structure in overlying strata would be different under the mining condition of different mining height and different face length. The face length plays a greater impact on overlying strata structure stability too. But after the face length reached a certain value, the increase of face length would not make greater imparct on structure stability. When the mining height reached a certain value, the "pressure arch" structure would not form in overlying strata. The definition of shallow coal seam was conditional and relative. A coal seam under the certain face length and mining height may belong to the shallow coal seam, when the face length and mining height changed, it may no longer belong to. The crux was lay on the basic characteristics and stability situation of "pressure arch" structure in overlying strata under different promoting stage of the working face, namely whether the stable and dynamic "pressure arch" structure could form in overlying strata. The above conclusions was proved by the mining practice of 1203 and 20601 faces in Daliuta mine, and provided a certain example for mining methods selection and solving problems in the production technology and security issues of shallow coal seam mining in Ordos region.

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. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  18. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3
  19. Analysis of the Impact of Tailings Dam Stability under Seepage Role,TV649
  20. Study on Hydraulic Fracturing of Low Permeability Reservoir,P618.13
  21. Numerical Simulation and Experimental Study of Air-Assisted Sprayer of Orchard,S491

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