Study on simulation of caving and evolution law of roof strata of large mining height workface in shallow thick coal seam
Abstract：Based on the condition of No.1-2 coal seam of Shendong minging area Shangwan Coal Mine,the caving characteristics,the fracture position and caving zone and fracture zone ＂two belts＂height of the 5.5 m large mining height workface＇s roof were studied by similar simulation test,with geometric similarity ratio 1∶50.The results show that the immediate roof caves stratified to loose blocks,and the goaf can not be full of these loose blocks;because of the increasing of mining height at one time,and the original immediate roof is far from full of goaf,the lower basic roof can not form hinge structure after it collapse,and the increasing of mining height evolves into the increasing of immidiate roof;before periodic weighting,fracture position of roof usually advance beyond working face 7.65 m;the height of two belts presents step increasing.
Keywords：shallow coal seamlarge mining height workfacethe height of two beltssimilar simulation testlaw of evolution
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 366-371 )