procedures for the interception of the roof and to ensure the streckensaums in the face of untertagebergbaus

摘要

The system is used in transitional areas in underground mining on seam-type mineral deposits esp. coal for intercepting roof layers and securing gallery edges. A slit (6) of greater depth (b) and height (a) is made in the adjacent rock (9), parallel to its plane, in the lengthways area of the gallery (1) above the seam (5). The slit filled with reinforced concrete (7), forming a continuous load bearing strip (8). It enables roof layers to be directly underpinned along the whole area, in the course of striding working. This is secure and widely applicable.