Shenhua Shendong Coal Group Corporation Limited

针对浅埋近距离综采工作面过上覆房采采空区和集中煤柱时易发生动压事故,并导致大面积切顶压架事故的问题,结合石圪台矿31号煤层综采工作面动压防治实践,分析可知采动影响导致上覆采空区集中煤柱失稳引发其上覆基岩关键块突然回转失稳,进而破坏下煤层基岩关键块的铰接结构,使其由回转失稳变为破坏性的滑落失稳,上下基岩层关键块体失稳产生的冲击载荷作用直接导致动压事故。结合顶板运动规律,提出了提前采取爆破集中煤柱、缩短工作面长度等技术,避免了上下煤层基岩失稳冲击叠加,减少了覆岩运动影响范围和程度,并在现场采用微震监测、地面钻孔多点位移计和地表下沉量观测等手段进行指导和验证,有效解决浅埋近距离综采工作面过上覆房采采空区和集中煤柱时易发生动压事故的问题。

According to dynamic pressure accident easily occurred when the fully mechanized coal mining face in shallow depth seam and contiguous seams group passed through goaf of the overburden strata and concentrated coal pillars and large area roof cutting and powered supports jammed accident occurred, in combination with the dynamic pressure prevention and control practices in the fully mechanized coal mining face in No.31 seam of Shigetai Mine, the paper analyzed the known min ing affected to the concentrated coal pillar lose stability in the goaf of the overburden strata and to cause the key block of the overburden base rock suddenly rotary and stability lost. Thus the articulation structure of the base rock key block in the low seam would be destroyed and the rotary stability lost would be changed to failure slidin g stability lost. The mine pressure bump load role from the stability lost of the key block in the top and low base rocks would directly cause the dynamic accident. In co mbination with the roof movement law, the centralized coal pillars blasting, mining face length reduction and other technology conducted in advance could avoid the bas e rock stability lost and bump overlied in the top and low seam and could reduce the overburden strata movement influence scope and degree. At the site, the micro-sei smic monitoring and measuring, multi point displacement gauge in the surface boreholes, surface ground subsidence observation and other means were applied to guid e and verify and could effectively solve the dynamic pressure accident easily occurred when the fully mechanized coal mining face in the shallow depth seam and contig uous seams passed through the goaf in the overburden strata and concentrated coal pillars.

“十二五”国家科技支撑计划资助项目(2012ABC10B00)；