Theoretical frontiers of in-situ rock mechanics under multi-physics-phase coupling in deep exploration of fluidized coal mining
摘要
As shallow energy resources on Earth are progressively depleted, enhancing the capability to extract deep coal resources has become an inevitable trend in global scientific frontiers and technological development, as well as a strategic choice to ensure China’s long-term energy security. The solid fossil resource nature and inherent energy attribute of coal endowment. Coal-fluidized mining is a disruptive technology that aims to break through the depth limits of solid mineral resource extraction. Its key lies in establishing a new theoretical and technical foundation for deep engineering science that can account for the influence of the in-situ occurrence environment in solid-mineral-resource-fluidized mining. Existing rock mechanics theories and methods struggle to incorporate the effects of the deep in-situ environment (current strength criteria, constitutive equations, etc., are depth-independent and unrelated to the deep in-situ environment), making them inadequate for effectively guiding the development of fluidized mining technologies and disaster prevention and control. There is an urgent need to develop new theories and methods for in-situ rock mass mechanics that consider the multi-physics and multi-phase environmental influences in fluidized mining of deep coal resources. Establishing a theory of in-situ multi-physics and multi-phase rock mass mechanics is fundamental to achieving solid-mineral-resource-fluidized mining. Regarding the new theoretical system of rock mechanics that accounts for the influence of the in-situ occurrence environment in fluidized mining of deep coal resources, four key scientific issues have been identified: ① The differential laws of the intrinsic parameters of the occurrence environment at different depths in solid-mineral-resource-fluidized mining and the physical-mechanical behavior of rock masses; ② In-situ rock mass mechanics theory that considers the multi-physics and multi-phase environmental influences in solid-mineral-r