Estimation Procedure of Influence Exerted by Trigger Effects in Rock Mass on Technical Condition of Long-Term Operated Underground Structures

Physical processes are initiated in rock mass by long-term induced vibration loads which give rise to triggering factors the neglect of which can result in instability of underground structures. The methodical characteristics of the trigger effect monitoring are described for the specific operating conditions of an underground powerhouse hall of a hydroelectric plant in the Kola Peninsula in Russia.