Study On Mechanized Top-caving Extraction And Gas Preventing Technique In Nantun Deep Uphill Soft Seam

After the Coal Mine of Nantun enters to the deth explore of soft coal bed mining, the mine pit mining condition had changed and the arrangement of the synthesis working surface had changed too. In order to ensure the mine pit's safety in the course of production, we must study and make effectual measures on the changes of the gas government and the ventilation system aspect.According to the ventilation system's parameter that was got from the research of the mine ventilation measure of resistance and the main ventilator performance determination, this thesis aims at grasp the rule and the characteristic of the gas from the upswept working surface and make optimization plan for the ventilation system and gas control. The implementation result indicated that the formulation ventilation system plan and the government measure of gas had guaranteed the mine pit depth explore of soft coal bed return picks. That's made a example for other synthesis working surface and will be meaningful to the production course of the coal mine!...