A special place among the problems of rock pressure is occupied by the fixing and management of the roof in the cleaning space. Domestic and foreign researchers have studied these issues on models and in mine conditions. In this case, the main importance was attached to the depth of development, the power and strength of coal and side rocks, the length of the face, the speed of movement of the face, as well as the choice of the type of fastening and roof management. Although many scientists and mining practitioners recognize the significant importance of the time factor and its impact on the reliability of the support, but in research it is almost not taken into account. At shallow depths, with negligible mining pressure, the time factor and reliability do not play a significant role. With the depth of development, a significant increase in mining pressure leads to changes in the physical and mechanical properties of rocks. The tendency to heaving increases, their plasticity, creep and fluidity increases. These processes, as well as the processes of rock destruction proceed in time differently. Therefore, it is impossible to study mining processes without taking into account the time factor and its influence on the reliability of production schemes ...

With the development of theoretical and experimental studies increasingly clear the general picture of manifestations of rock pressure, the mechanism of deformation and destruction of rocks in time and space. It is established that one of the main acting factors is not short-term, as previously thought, and long-term strength. The issues of stability, reliability of fixing of cleaning and preparatory workings and many others cannot be satisfactorily solved without taking this factor into account. Specificity of solving these issues (short life of many mine workings, changes in mining and geological conditions, etc.) makes it necessary to obtain the characteristics of long-term strength in the shortest possible time. The existing method of determining these characteristics with the help of special equipment during testing under constant load requires a long time (from several months to several years) and does not satisfy the necessary conditions ...