Investigation, development and demonstration of a method of integral mechanisation in coal seams at an angle between 40 and 60 degrees
The integral mechanisation of semivertical and vertical seams with 40/90 degree dips was a problem not satisfactorily solved though widespread in coal mining. The aim of this project was to find equipment which helps to resolve this situation. Fourteen supports were designed and installed in an experimental face with 57 degree dip and 1.58 m mean thickness. The movement of the filling for different seam inclinations was also investigated, with the help of a scale model, a number of measurements on site and a computer program simulating its behaviour. Research resulted in the following conclusions: - The method is feasible in seams ranging between 0.90 and 2.20, with medium and even bad roofs, appropriate walls and minimum 500-600 m length. - With or without filling, failure of a considerable part of the roof occurs after the passing of the supports and for this reason - at least for the head level - a retreating method is recommended. - For seams with over 70 degree inclination, other modifications are probably needed and should be studied as a result of experience "in situ".
Bibliographic Reference: EUR 12168 ES (1989) MF, 129 pp., ECU 8, blow-up copy ECU 16.25
Record Number: 198911116 / Last updated on: 1994-12-01
Original language: es
Available languages: es