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In this paper, a new rock mass classification system named Q HLW system is proposed with the purpose of evaluating the suitability of the host rock for high-level radioactive waste (HLW) disposal. In the system, the rock suitability evaluation of two different scales is considered, namely the repository and tunnel scales. The system is developed on the basis of Q-system, and considers both...
Knowledge of the in-situ stress field in the rock mass at depth is important to provide stress boundary conditions for underground excavation design, stability evaluation, and the optimization of ground support systems. In the present study, in-situ stress measurement using hydraulic fracturing method is conducted in the Beishan area in Gansu Province, China, a preferred candidate site for China's...
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