Comparative Study On Strata Pressure Behavior Law By Use Of Large Mining Height When Under The Original Formation And In The Under Goaf

Longwanggou colliery is located in north part of Zhun Ge Er coalfield,Erdous Coal-seam of north C hina strata. The Longwanggou mine 6# coal seam has two remarkable characteristics: extra thick and nearly flat coal seam. In order to comparative study extra thick and nearly flat seam by use of large mining height when under the original formation and in the under goaf.Strata pressure behavior law,this paper combines method including theory analysis,physical simulation and numerical simulationTheory analysis :on the basis of overlying strata thick and lithology the calculation method is confirmed immediate roof,main roof and key stratum the height and position。Calculation first weighting span and cycle weighting interval These analyzes calculate theoretically explained overlying strata movement regularity and mine pressure behave law of 6# coal mine.Physical simulation: by laboratory physical simulation had measured under the original formation and in the under goaf mine coal seam first roof weighting pace cycle weighting interval coal floor abutment pressure and overlying strata movement.physical simulation combine theory analysis more clearly mine pressure behave law of under the original formation and in the under goaf.Numerical simulation:by the use of UDEC software,simulation overlying strata movement when 6# coal seam si mined of under the original formation and in the under goaf combine physical simulation correct result about immediate roof main roof first weighting and main cycle weighting interval key stratum fracture position.By numerical simulation more clearly mine pressure behave law.By Three research methods learning from each other contact and the amendment,finally the completion of a comparative study about longwanggou colliery extra thick seam large mining height strata pressure behavior law when under the original formation and in the under goaf.