Meitan kexue jishu (Jan 2023)
Geo-dynamic division and its application in study of rock burst
Abstract
Rock burst, one of the major dynamic disasters in coal mine, which is the energy sudden release accumulated in coal and rock under elastic deformation. According to the academic viewpoint of geo-dynamic division, the internal dynamic action such as modern geological tectonic movement and tectonic stress field have an important influence on the preparation, occurrence and development of dynamic disasters in coal mines. Geo-dynamic division method is mainly used to research the impact of internal dynamic geological processes on human activities in engineerings, and it is mainly used to research dynamic disasters such as rock burst under the influence of modern tectonic movements in the field of coal mining. According to the characteristics of tectonic movement and tectonic form in the mainland of China, the geo-dynamic division researching team, Liaoning Technical University, has expanded the content of geo-dynamic division after the research and practical application on the basis of the geo-dynamic division method with fault block structure division as the core content extensively for more than 30 years, which was established by academicians I.M. Batugina and I.M. Petukhov in Russia. After that, the evaluation method of geo-dynamic environment, the analysis method of coal-rock dynamic system and energy characteristics, and the multi-factor pattern recognition method of dynamic disasters in coal mines were established. The research team developed the rock mass stress analysis system and the geo-dynamic division information management system, which enriched and deepened the theory and methods of geo-dynamic division, and further created a new system of geo-dynamic division, which providing a new research method for the risk prediction and prevention of dynamic disasters in coal mines such as rock burst, coal and gas outburst. The geo-dynamic division method and some application results in rock burst were introduced. Firstly, based on the analysis method of coal-rock dynamic system in geo-dynamic division, the “upper limit value of damage zone radius” was determined as the reference value of advance support range in working faces with rockburst risk, which provided a basis for determining the advance support range of rockburst mines. The “upper limit value of influence zone radius” was determined as the reference value of influence range of working face mining in rockburst mines, which provided a basis for the determination of the distance between two working faces. Secondly, based on the multi factor pattern recognition method of geo-dynamic division, with the support of the geo-dynamic division information system, we have realized the refined prediction of rockburst risk by units. We can provide more accurate spatial location of rockburst risk area and more accurate prediction results of rockburst risk degree for the mines, thus improving the accuracy and timeliness of rockburst risk prediction in coal mines. The geo-dynamic division method has been widely used in the risk prediction and prevention of dynamic disasters in more than 40 coal mines, such as Yima, Hebi, Hegang, Shuangyashan and other mining areas in China.
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