CRITICAL VALUE DETERMINATION OF GAS PRESSURE THAT CAN CAUSE GAS-DYNAMIC PHENOMENA OUT OF THE ROOF AT SYLVINITE LAYER EXTRACTION AT THE VERKHNEKAMSKOE DEPOSIT
In carrying out the work geomechanical modeling of strain-stress state of entry roof rocks is conducted and the critical value stability of gas pressure in the free gas near-contact accumulation that can cause gas-dynamic phenomena out of the entry roof in sylvinite layer is conducted