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.
Highlights
The tunnel surrounding rock control has a directly impact on the underground coal mine production and safety
With the increase of mining depth, ground stress being more and more huge, tunnel deformation increasing sharply, the stability of surrounding rock and its support being more and more difficult, all of these phenomenon seriously harm the safety of coal mining [1,2]
The above analysis shows that the level 14 overall main transportation tunnel lies in the layer with secondary strength below, and the structure characteristics act as an interphase hard and soft adverse state
Summary
The tunnel surrounding rock control has a directly impact on the underground coal mine production and safety. Of the national coal mine accident, the roof failure accident occurred in tunnel accounts for a large proportion. With the increase of mining depth, ground stress being more and more huge, tunnel deformation increasing sharply, the stability of surrounding rock and its support being more and more difficult, all of these phenomenon seriously harm the safety of coal mining [1,2]. With the mining level extending in Mine Zhaogezhuang, the tunnel deformation damage increases obviously with level 14 reaching to −1200 m. Surrounding rock deformation control difficulties and tunnel frequent overhaul occupy a large manpower and material resources, deep coal mining is restricted. It’s significant to research the failure characteristics and supporting method in Mine Zhaogezhuang level 14
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