Mechanism Analysis and Control Technology for Strong Strata Behaviors in Shallow Depth Seams While Mining out of the Concentrated Coal Pillar in Upper Room and Pillar Goaf
- Organization:
- Canadian Institute of Mining, Metallurgy and Petroleum
- Pages:
- 10
- File Size:
- 1195 KB
- Publication Date:
- Jan 1, 2015
Abstract
Presently,Many long-wall fully-mechanized faces in shallow depth coal seams are below room and pillar goaf in Shendong mining area. When the working face is advanced out of concentrated coal pillar in upper room and pillar goaf, strong strata behaviors often cause support crushing accident. Aiming at a support crushing accident which happened in Shigetai coal mine of Shenhua group in Shendong mining area, this paper analyses the stress transfer process while mining out of concentrated coal pillar by numerical simulation software FLAC3D. According to the feature, simplifying the roof of upper room and pillar goaf as supporting-beam structure explains mechanism of large area collapse in room and pillar goaf roof. Based on the feature of supporting-beam structure, deep-hole blasting concentrated coal pillar technology is proposed to control the strong strata behaviors in Shigetai coal mine. The blasting control effect is confirmed through characteristics of strata behaviors, growth circumstance of ground crack and multi-point extensometer monitoring results. By using control technology, Shigetai coal mine has been successfully avoided support crushing accident.
Citation
APA: (2015) Mechanism Analysis and Control Technology for Strong Strata Behaviors in Shallow Depth Seams While Mining out of the Concentrated Coal Pillar in Upper Room and Pillar Goaf
MLA: Mechanism Analysis and Control Technology for Strong Strata Behaviors in Shallow Depth Seams While Mining out of the Concentrated Coal Pillar in Upper Room and Pillar Goaf. Canadian Institute of Mining, Metallurgy and Petroleum, 2015.