Research And Control Of Hard Roof Of Common Mining Work Face

The article passes site of investigation,reconnaissance,sampling,rock of mechanical assay, establish mathematical model,theory analyse and site actual measurement record analyses methods as well,mainly to study the characteristics of surrounding rock, relations between support and surrounding rock, reasonable support pattern, reasonable methods and parameters of overhead caving in working faces of strong roof.The main study results of this Paper include several accepts below:1) Relations between support and surrounding rock in working face of strong roof.Enlarging support will reduce the sub fubsidence of roof,but it can't limit the ultimately subsidence of roof.Due to rigid roof can bear a lot of stresses,if it want to through the holding power of bearer to limit the subsidence of roof,it lack of enough strength and stiffness.2) It is harmful that in the roof break roof rotating and subsidence,to bearer,it create level acting force pointing to coal wall and bear lots of impulse type push with bearing vertical loading weight.3 ) If it want to control rigid roof reasonable and effective,work face must adopt most reasonable and effective support method to make sure that work face...