承压水下临界开采提高回采上限技术实践

Practice on Raising Upper Extraction Limit in Critical Mining Under Confined Water

为了提高煤炭采出率,新庄煤矿在三2煤上限风氧化带附近回采时,科学设计露头煤柱尺寸,将露头原设计防水岩柱由50 m改为16 m,开采上限倾向提高300多m,使11采区多回收煤炭56.4万t。在保证安全的基础上,最大限度地提高了回采上限,创造了良好的经济效益。

When stoping work was developed near efflorescent oxygenized belts of upper Ⅲ2 Coal Seam in Xinzhuang Coal Mine,in order to improve coal recovery,the size of outcrop barrier pillar was altered from 50 m to 16 m by scientific design,and upper extraction limit was raised 300 m in tendency,0.564 million tones′coal was recycled in 11 mining area.Based on ensuring the safety,upper extraction limit was raised maximizely,and good economic benefit were realized.