Systems of Support for Junctions of Mine Shafts and Roadways in Salt Rocks

Alternative systems of support for junctions of mine shafts and roadways in salt rock mass include monolithic concrete lining, concrete lining with a yielding layer and supplementary reinforcement. It is shown that traditional non-yielding concrete lining needs periodical basic repair every 5-10 years during operating life. An increase in the thickness of such support is not a guarantee of repair-free operation. It is proved to be expedient to support junctions with mine shafts with reinforcement systems of rock bolts or frames with yielding elements. This conclusion is based on the data of instrumental monitoring of adjacent rock mass and on the results of ANSYS-based simulation of evolution of stress state and damaged rock zones in time.