Research On Stability Of Surrounding Rock And Stress Redistribution Of Deep Shaft Connection Caverns

In construction of coal mines, often we need a lot of excavation tunnel and cavern, forming the structure of complex system of underground chambers. Underground caverns system shafts, tunnel and cavern complex distribution and overlapping each other, especially in the Horsehead site, changes in rock stress situation is more complicated. In order to ensure the construction and use of safety, the need for a complex system of underground caverns structure more in-depth study. This article use numerical simulation method studied the Huainan Mining Group Pan I easter mine auxiliary shaft connected caverns rock stability and stress redistribution. The main research contents and results are as follows:(1) Based on generalized Hoek-Brown criterion for rock mechanical parameters were estimated using MIDAS/GTS finite element software, three-dimensional numerical simulation of surrounding rock stability Deep Shaft connection caverns, cave reveals Rock around the room displacement field and stress field distribution and characteristics of the force of supporting structure under conventional bolting and shotcrete lining and two composite Bracing situation and pointed out the importance of the deep mine shaft connecting chamber group selected position, while according to numerical analysis, proposed to strengthen support design deep Shaft connection caverns.(2) Using the ABAQUS finite element software for Deep shaft ingate at the stress distribution analysis, drawing stress path stress variation curve and Lambe notation, revealing the stress distribution ingate part and stress redistribution process provide a reference for monitoring the safety of the construction process.(3) Stress path indicated by observing the measuring point of principal stress curve and Lambe law just to see the impact of the excavation process of measuring point stress, obtained according to step excavation key trends, to provide reference for the construction of mine safety.(4) Describes a two-dimensional stress path regularization process, and the regularization of traditional two-dimensional stress paths and stress path Lambe comparing both stress redistribution process can be represented, but the former is considered the intermediate principal stress off dig that affect security. Therefore, security analysis utilizing both stress path method, should pay attention to distinguish.