With the mining depth and the complexity of the condition increasing, and more and more engineerings with the great depth, concerning water conservation and hydropower station, communications, national defence, basic physical tests and so on, being constructed in the area with great tectonic background, great loss has been induced by the disasters such as severe rockburst, continued large deformation and great landslip. From 2001 to 2007, 13000 accidents in deep metallic mines caused 16000 deaths and great loss of the resources. In recent years, in the fields of conservation and hydropower station and communications, there were thousands of deep disaters, which caused lots of deaths and great economic loss. Furthermore, with the development of the depth of the engineerings, possibility of the deep disasters and the loss will obviously increase.

The key problems to cause the failure on eliminating the great disasters in deep engineerings are absence of research on the mechanics of these disasters, also theories and methods to forecast and control them. In order to solve these problems, this project will focus on four scientific issues as follows:

(1) Rock mass structure and complicated stress and their domination on great disasters.

(2) Mechanical evolution disciplinarian of cracked rock mass under intensive unload in deep engineering.

(3) Dynamical process and mechanics of great disasters in deep engineerings.

(4) Time-space forecast and dynamical control of great disasters in deep engineerings.

This project is divided into 6 tasks as:

(1) Characteristics of rock structure and insitu stress for the deep underground openings.

(2) Macromeso mechanical behaviour of multi-cracks rock mass under the coupled effects of high stress and high unload.

(3) Study on mechanism of zonal disintegration and its time effect in deep rock mass engineering.

(4) Studies on mechanism of rock-burst induced by blasting excavation and its energy transition to rock fragmentation in deep hard rock mass.

(5) Deformation evolution and disaster inducing for rock at great depth and under fast stress releasing.

(6) Space-time forecasting and dynamic contolling theories for great deep engineerings disasters.

This project concerns main academic groups in the research field of deep engineering safety in our country such as Institute of Rock and Soil Mechanics(CAS), PLA University of Science and Technology, Central South University, Sichuan University, China University of Minning and Technology( Beijing), Institute of Geology and Geophysics( CAS), Wuhan University, Shandong Univrsity, 4 State Key laboratories and 3 Department Key laboratories. Based on the underground of several deep great engineering in our country, multi-subjected and inter-subjected researches are sytemicly and deeply conducted to reveal conditions and evolution mechanism, setup time-space forecast and dynamical control of great disasters in deep engineerings. Efforts of this project will provid the basic theoretical support to construction safty, operation and safe deep mining with high efficiency.