摘要
以鄂尔多斯地区浅埋煤层房柱式采空区下煤层长壁开采为主要研究对象,通过理论分析、现场矿压实测等方法,得出房柱式采空区上部覆岩在一定的采高范围内存在叠合梁结构,并且上位基本顶结构为固定梁,下位基本顶结构为悬臂梁,房柱式采空区煤柱及以下顶板构成直接顶;在上位固定梁的回转力矩作用下,下位悬臂梁周期性折断,其动载荷通过房采区煤柱传递给采场支护结构。上位悬臂梁与下位悬臂梁失稳的不同周期性,会引起工作面周期来压的不等距和来压强度的不等强性,是长壁采场支架失稳的主要原因。
The study focused on shallow coal seam long-wall mining under room-and-pillar goaf by using the theory analysis and field mine pressure observation etc, in Ordos, it holds that upper overburden on the room-and-pillar goaf have composite beam structure in certain caving height range. The upper basic roof structure is fixed beam and the under is cantilever beam, the room-and-pillar mining goaf and the downside strata become the immediate roof. Under cantilever beam is periodically by upper fixed beam gyroscopic moment, the dynamic load transfer to support structure in mining stope by passing through the pillars in room and pillar goaf. Different instability periodicity of upper fixed beam and under cantilever beam will cause weighting length and ground pressure strength unequal in working face, which is main cause of support buckling in long-wall mining stope.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第6期898-902,共5页
Journal of China Coal Society
基金
国家"十一五"科技支撑计划资助项目(2008BAB36B11-03)
关键词
浅埋煤层
房柱式采空区
长壁开采
顶板结构
周期来压
shallow seam
room-and-pillar mining goaf
longwall mining
roof structure
periodical pressure
