摘要
坚硬顶板抗拉抗压强度大、弹性模量高、节理裂隙发育程度不明显、单层岩体厚度大、整体性及自承能力强,在工作面回采过程中不易自然垮落,大面积悬顶严重。通过在开切眼顶板上深孔预裂爆破破坏顶板的完整性,能够减小直接顶初次垮落步距和顶板悬露面积,保证工作面安全、高效生产。
Hard foof tensile compressive strength, high elastic modulus, joint and fissure degree of development is not obvious, large single rock thickness, strong integrity and self-supporting capacity in the mining face difficult process of natural collapse, large hanging top serious.Cut through the open roof hole pre-splitting blast destroyed the integrity of the roof, it is possible to reduce the immediate roof breaking down and step away from the exposed area of the roof overhang, face guarantee safe and efficient production.
出处
《煤矿现代化》
2015年第4期20-22,共3页
Coal Mine Modernization
关键词
坚硬顶板
爆破预裂
初次垮落步距
Hard roof
Blasting presplit
Step distance of first collapse
