Conception system of deep and evaluation index for deep engineering

With the increase of mining depth, the non-linear dynamic mechanical disasters, such as rock blasting, methane outburst, rheology, water outburst, etc., occur more and more. The rock mechanics problems caused by the deep mining engineering are focal problems of the field of the mining and rock mechanics field both in China and other countries. Focusing on special geological mechanical environment of deep engineering, the conception system is put forward by deepening research into non-linear mechanical characters of deep engineering rock mass, which points out that the mechanical system of engineering rock mass in depth is non-linear mechanical system but not the linear mechanical system of that in shallow. Conventional theory, design method and technology are partially or entirely invalid. Using difficulty coefficient and hazard index as the evaluation indexes to evaluate the controlling condition of surrounding rock can synthetically reflect the mechanical characters and engineering characters of rock mass in deep engineering.