Reaearch And Its Application Of Coordination Mining Considering Disaster Reduction Prevention Bangladesh Barakupuria Mine With All Thick Coal Seam,Loosen Aquier Zone And Sadstone Roof

Bangladesh Barakupuria Minewhich strata belong to typical gondwana strata structure.It constracted by Barakupuria project consortium andsponsible for the main production and management.There are certain differences in the whole overlying strata with Chinese Jurassic and carboniferous permian strata.Carry out research in the Bangladesh Barakupuria Mine on coordination of mining technology under the thick unconsolidated confined aquifer has great theoretical significance andengineering application value in safe mining under water body system.Based on the engineering background of actual geological and mining condition of the mine,based on the mining principle of coordination and reduction losses,the damage degree to rock mass form extraction was reduced.The integrated use of laboratory simulation experiments and field detection and theoretical analysis method,The development law of the frac-tured zone and the stability of the key layer and the key layer of the water barrier in slice min-ingwas studied under the condition of gondwana formation,and the appropriate coordination detract from mine mining plan was made,the main results are as follows(1)On the basis of comprehensive analysis of mine geological and mining conditions,expounds the "three thick" features of strata structure,namely the special thick coal seam,the thick roof and thick loose aquifer,analysis to determine the "three thick" is the important factor result in mine disasters,it is concluded that the special thick coal seam layering slice mining limit high coordination loss is an effective way to keep the mine safety.(2)Based on the analysis of coal mine mining water-resisting layer,aquifer,the spatial distribution characteristics of geological structure,determine the Barakupuria Mineexist within water and sand inrush type and thin bedrock water inrush type and geological structure water inrush type from three types of water disasters,and has carried on the division according to the types of mine water disasters,determines the southern mining field is the mining disaster control area,for coordinated mining laid the foundation of the overall arrangement of the mine(3)Through numerical simulation,physical similar material simulation and field detection,the hierarchical mining overburden rock failure characteristics and development rule of the water flowing fractured zone were studied.Analysis show that extraction under the condition of gondwana formation,the overburden damage is large and the deformation is violent,growth altitude ofwater flowing fractured zone higher and a higher growth rate.This paper gives the prediction formula of the high level of the fracture zone in the layered mining overburden of gondwanana strata,and provides the scientific basis for the stratified limit mining.(4)Post-buckling theory is used to analyze the structure stability of key strata,and based on the energy criterion is given the necessary and sufficient condition on the stability of key strata structure,set up the role of the main key stratum in the overburden rock load limit damage condition,a reference to determine the reasonable width of working face was offered.(5)By theoretical analysis and the surface observation,analyzes the law of strata movement,the strata movement parameters,and by probability integral,the bedrock of main influencing angle is 76?,the influence angle of the loose layer.is 52°,the main effect of the slicing the strata movement range has been cleared,provides a basis for the determination of interstratified interval coordination between layers.(6)The reasonable width and height of the working surface are determined based on the fracture of the thick and hard roof of the coal seam and the reduction of the energy of the hard top plate and the subtraction of the bedrock water.,on the basis of the principle of coordination of mining to avoid one,two layer mining boundary tensile stress superposition damage LDT of waterproof performance,two layer mining,to destroy a layered segment the whole flat steady-state strata subsidence,coal pillar and control two layered mining overburden rock lead water crack bring not affected LDT,identified the two layered coordinated mining layout and mining height control calculation method,constructed the coordinate mining suited to the characteristics of the meng and mine disasters loss design method(7)Coordination of mining design method,gives a coordinated impairment of mine mining plan,determine layer one mining height 3m,layer two mining height according to crack than 20 calculation,layered boundary fault distance based on0.8 times ofthe major effectbed-rock top boundaryradius.Engineering practice shows that the hierarchical mining to mining height limit times hard thick coal seam roof,the roof strata is weakened effectively overall breaking energy release,to avoid the mine flooding and rock-burst disaster accident;the height of water flowing fractured zoneis controled,LDT's damage is avoided,protect the LDT effect-tively,layer one section pillar was destroyed,gentle and steady subsidence strata whole imple-ments hierarchical coordinate offset arrangement,the superposition of the mining boundary tensile stress areawas avoided.By limiting layer two mining heigth,protect the stability of water-resisting layereffectively,the Barakupuria Mine complex safety mining under complex water bodieswas implemented.