Research and development the criterion of stability for deep rock

Strength theory is the foundation of deep space utilization and disaster prevention and control. Nevertheless, because of the initial property of the ‘three high’ occurrence environment of the deep earth, it is necessary to establish strength theory, which is different from the classical strength theories, and describe the disasters with high energy level frequently occur in deep rock body. Compared with the traditional model, a generalized unified strength theory was proposed considering the intrinsic relations between energy conversion and substance physical process. The geological parameters including rock integrity designation, elasticity modulus, and earthquake energy release level and resistance strain energy of the supporting and protecting system were adopted to establish the model. In terms of five grades of deep rock mass movement, i.e., dilation, failure, and weak, moderate, intense rockbursts, four boundary values were presented as 0.9，1.0，1.2 and 1.9. The generalized unified strength theory (GUST) is realized to achieve a unification in three areas:dilation criterion，strength criterion and rockburst criterion. The GUST was used to verify the Byerlee theory and the good agreements were obtained. The problems of deep ground dilation and time，rockburst and time were solved. The effect of the release strain energy of earthquake and resistance energy of supporting system was studied in terms of dilation，failure and rockburst of deep ground，and the design and calculation of deep ground with resistance strain energy of the supporting and protecting system were proposed.