TY JOUR TI MINE SHAFT INSPECTATION THE TRUNK OF MINE OPERATED IN DIFFICULT ENGINEERING-GEOLOGICAL CONDITIONS KW shaft KW combined shoring KW concrete KW tubing KW compulsory checking KW extensometer KW strain KW deformation KW load on the shoring JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Vorobev, .. AU Sergeev , S.. AU Frolov , N.. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov