Strata mechanics of hydraulic sub-level coal mining
Strata mechanics have been studied by monitoring and observing underground mines, and by means of digital and physical models. On the basis of these integrated investigations three principal phenomena have been evaluated: Coal strata are displaced by roof movement along planes of stratification and differential shearing of coal pillars, and floor strata mainly by heave deformations. Within sub-level structures are stress-concentration zones, stress-relaxed zones with pushes of abutment stress of more than 50 m, and the influence of mining stresses for 150-300m. Bed separation and sagging, and strata breaks, are caused by caving of the immediate roof by block rotation, and the main roof by block crushing. Strata mechanics of sub-level hydraulic coal mining still are not well understood and require further investigation.
- Research Organization:
- Univ. of Alberta, Edmonton, Canada
- OSTI ID:
- 7072931
- Journal Information:
- Int. J. Rock Mech. Min. Sci.; (United States), Vol. 19:3
- Country of Publication:
- United States
- Language:
- English
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