Abstract
The shotcrete technology (application of a concrete layer) is widely used in coal mines. The applied layer of shotcrete to the underground workings support, changes the load capacity of the entire supporting system (and its elements). The coating of shotcrete is several times cheaper, faster and safer compared to the traditional reconstruction of the roadways - replacement of the supports. Appropriate selection of shotcrete parameters will allow applying shotcrete to places previously dedicated for reconstruction, and thus reduce the financial resources consumed in the mines for the reconstruction of underground workings. The article presents a method of testing steel arch supports covered with shotcrete, a station for weighting support section and a test plan.
Highlights
IntroductionThe mines are able to choose the appropriate support section due to the purpose of the underground working, the required dimensions, as well as the expected tension from the rock mass and possibly resulting from the suspension of machinery and equipment, and determine the required spacing of the support sections
Underground roadways in polish coal mines are developed mainly with use of steel arch supports made of V-bar sections V29 (29 kilograms per linear meter) and V32 (32 kilograms per linear meter), and recently more often sections V36 (36 kilograms per linear meter) [16]
Proper load capacity of mixed underground roadway support – steel arch supports covered with shotcrete layer – is very important for providing stability of underground workings and safety of employees
Summary
The mines are able to choose the appropriate support section due to the purpose of the underground working, the required dimensions, as well as the expected tension from the rock mass and possibly resulting from the suspension of machinery and equipment, and determine the required spacing of the support sections This ability to shape parameters of the steel arch supports is its undoubted advantage. When choosing a steel supports, it is necessary to take into account its durability, resulting primarily from the corrosion of steel elements [10,12,18] (sections, clamps, stretchers, steel mesh lining) caused by the aggressiveness of the mine environment [13,14] This is an extremely important factor, especially in the case of excavations with a long service life of up to several or several dozen years
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