Tunnel Surrounding Rock Deformation Characteristics and Control in Deep Coal Mining
- 1 Faculty of Resources and Safety Engineering, China University of Mining and Technology, Beijing, China
- 2 Faculty of Resources and Safety Engineering, China University of Mining and Technology, Beijing, China
- 3 Faculty of Resources and Safety Engineering, China University of Mining and Technology, Beijing, China
- 4 Faculty of Resources and Safety Engineering, China University of Mining and Technology, Beijing, China
Abstract
In order to study the failure characteristics and control method of deep tunnel surrounding rock, based on the stress test, the structure and stress state of the main transportation tunnel surrounding rock in Mine Zhaogezhuang level 14 was analyzed, and it shows that the surrounding rock is exposed to an interphase hard and soft disadvantageous structure state and complex high stress repeated addition area; Through the theoretical analysis and the statistical data, the relation between the tunnel stress transformation and the surrounding rock deformation was proposed; Through the numerical simulation of the tunnel surrounding rock failure process with the help of RFPA procedure, the results show that the damage of the transportation tunnel level 14 mainly occurs in the bottom and the two coal ribs, and the failure process is spreading from the bottom to the two coal ribs, and the effect of the surrounding rock deformation control is obvious by using the way of 2.5 m anchor with 1.0 m grouting strengthening.
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