Surface air leakage of fully-mechanized top coal caving mining in shallow depth seam affected to abandoned coal spontaneous combustion and control

According to the surace air lealage problems of thefill-mnechanized top coal caving mining in the shallow depth sean in Pingshu Mining Area.the paper analyzed the ground suface alr leakage causes and the damage to the abandoned coal spontanecus combustion in the ge af Each parameter of the ground sura:air eakage was detemined with"aifference between the ground surace atmospheric pressure and the goaf atmospheic pressure in underground mine,th air fow diffrence between theair income gateway and air retuning gateway in the coal mining face racer gas instantaneouesly released at the ground surface melhod The ail fowof the air retuning gatewa in No.9203 coal mining face was higher than theail fow of theair incomegateway and the dfferential as 1 m8f min. Theair from the ground surface fowed nto the goaf through the ground surace cracks and the minair velocityof theair leakage wias .097 m / .according to the test resuts of the air leakage.comprehensive prevention and control measures with "the air lealage prevention with the ground surace crack sealing + thefie prevenion and conrol ith ntrogen injecion in goaf t reform of mining technology and organization managementf'were provided. Th site practices showed that the above measures could efectv ly ontrol the ground surtace air leakage of thefally mechanized top cal caving mining in the shallow deph seam and the abandoned cal spontaneus combustion in tegoaf and could ensure the safety mining of the coal mining face.