METHOD FOR THE PROTECTION OF A DEVELOPMENT WORKING

摘要

A method for the protection of a development working involves arrangement of a two-layer belt of calculated width and use of the upper layer of concrete as backfill material, with addition of self-expanding solution. As backfill material of the lower layer one uses concrete with addition of curing accelerators, and the thickness of the upper layer is 20-30 % of the seam height, and time of bringing it into operation corresponds to instant of coming to 68-72 % of the end strength of material of the lower layer.