采矿方法复习.ppt

Fully Mechanized Mining Technology Modern longwall mining method Self-advancing hydraulic support is employed at the face area. 普通机械化 综合机械化 Fully Mechanized Mining Technology Modern longwall mining method Breaking：Shearer/plow Loading: Shearer/plow Transporting：AFC Supporting：Self-advancing support Gob disposal：Fully caving Fully Mechanized Mining Technology Shearer Electric motor Gearhead Cutting drum Haulage unit Electric motors Gearheads Haulage Cutting drum Fully Mechanized Mining Technology Plow Haulage unit In low-seam mining, plow is widely used. Generally, through the pulling force of the haulage chain, the plow moves along and plows the coal face back and forth. Fully Mechanized Mining Technology Self-advancing hydraulic support Type: Chock/Shield/Chock-shield Bearing capacity: the Max. load per unit area that the rock can withstand before failure Fully Mechanized Mining Technology Longwall face move Steps: pre-move preparation, move preparation, move and installation and completion. With this method of extraction only a single longwall is developed at the foot of the seam. Longwall Top coal Caving is a method of extraction for underground mining of thick seams (greater than 4.5 m). It uses a longwall set-up and natural forces to aid in the winning of coal. Longwall Top Coal Caving Under the present techniques, the maximum mining height for single-slice longwall mining is approximately 5 m to 7 m. Roadway layout in District The roadway layout and production system in a single coal seam are the most simple in mining thin or medium-thick coal seams. Seams thicker than 5 m or 7 m will be extracted in multiple slices. Roadway layout in District Slicing system is used in gently inclined to inclined thick seams. In slicing mining, a coal seam is divided into slices of suitable thickness. Coal Mine Gas Mine gas Methane (CH4), CO… Major hazardous gas: CH4 (80-96%) Gas Explosion Condi