Research status and prospect of fault activation under coal mining conditions

Fault activation under mining conditions is easy to induce dynamic geological disasters such as rock burst and floor water inrush. How to carry out advanced prevention and early warning for a series of dynamic geological disasters caused by the activation of stope faults has always been a scientific and technical problem faced by coal mine safety mining. This paper summarizes the research status of stope fault activation at home and abroad from three aspects of numerical simulation, similar physical simulation and field test. Focusing on the monitoring and early warning methods of fault activation, including microseismic monitoring technology, acoustic emission technology, apparent resistivity monitoring technology, optical fiber sensing technology, water injection test, etc., the main existing testing and evaluation methods are summarized from the aspects of method principle, research status, technical characteristics and so on. Combined with the current coal mining in complex fault areas in China, the formation mechanism and internal relationship of several typical dynamic geological disasters induced by fault activation are analyzed. At present, the research on multi-dimensional and multi-scale whole process fine monitoring technology of fault activation induced by mining is still insufficient. Based on the requirements of precision and intelligence of coal mining, it is pointed out that the research on coal mining in complex fault area should develop in the direction of multi field coupling, fine model construction, multi means comprehensive exploration, intelligent early warning, etc. It is considered that further research on the basic theory of fault activation, fine simulation, multi-dimensional multi field multi-scale monitoring and early warning technology system can provide a solid foundation for the mine geological guarantee work under the guidance of intelligent coal mine.