摘要
通过三维数值模拟分析认为,大采高综采工作面加长、采高加大易于发生片帮,其机理:在采动应力作用下,煤壁先发生较小的挠曲变形,达到极值时,将在煤壁上部0.35倍采高处产生破裂,之后煤壁全部片落;防治片帮可采取特种支架与合理的回采工艺.特种支架为提高支架工作阻力、缩小端面距、二级护帮机构.回采工艺:电液控制系统实现擦顶移架、及时移架,移架速度在8 s以内.
Based on 3D numerical simulation, concluded that rib tends toward spalling when working face longer and mining height higher in fully mechanized mining with great mining height. The mechanism of rib spalling was concluded. At first with mining stress, the rib had small flexure. When mining stress culminated, rib would be breached at 0.35 times of mining height, afterward all rib spalled. Using special support and reasonable mining technics can prevent and cure rib spalling. The special support included that adding the yield load, reducing distance of tip-face, increasing the secondary protecting board. Mining technics included that moving the support near- ly with roof using electro-hydraulic control, moving the support in time, time of moving the support less than 8 s.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第1期50-52,共3页
Journal of China Coal Society
关键词
大采高综采
片帮冒项
支承压力
端面距
二级护帮机构
fully mechanized mining with great mining height
rib spalling
support stress
distance of tip-face
double protecting board
