Engineering Research Papers
ABSTRACT:
This paper reports the results of a research study which was carried out in order to analyze the stability of a tunnel at Glandroud coal mine, which is situated in northern Iran. The tunnel, with dimensions of 3 x 3.2 meters, was excavated at a depth of 150 meters below the surface. A numerical method was used to analyze the stability of the tunnel. Due to the structural, features and geology of the area, the distinct element method was used and the code utilized according to this method was UDEC. The results obtained from the numerical analysis show that instability in the tunnel is due to block falls from the roof and sidewalls. In view of this, various support systems were analyzed. This analysis shows that a combination of grouted rock bolt and shotcrete is the most suitable support system in Glandroud coal mine tunnel.
1 INTRODUCTION
The excavation of tunnels in coal mines causes instability, which may occur as a result of roof falls, wall failures or a combination of both. Therefore, in order to conduct safe mining operations, the stability of such tunnels is very important The prime concern in excavations is the control of displacements in the rock surrounding the excavation. In each excavation the design objective is to ensure that displacements of the rock around the excavation do not interfere with specified engineering activities (Pan et al. 1991).
Computer modeling for strata control and in rock mechanics has developed significantly in recent years. There are various numerical methods and codes available for stability analysis of tunnels. One of these methods İs the distinct element method, which has been developed for deformation and stability analysis of multiple-jointed rock masses around underground structures. Due to the structural features and geology of the Glandroud area, the distinct element method was used for stability analysis. The code utilized according to this method was UDEC. Many researchers have found UDEC to be a very powerful code when analyzing underground structures in various rock masses.
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ABSTRACT:
This paper reports the results of a research study which was carried out in order to analyze the stability of a tunnel at Glandroud coal mine, which is situated in northern Iran. The tunnel, with dimensions of 3 x 3.2 meters, was excavated at a depth of 150 meters below the surface. A numerical method was used to analyze the stability of the tunnel. Due to the structural, features and geology of the area, the distinct element method was used and the code utilized according to this method was UDEC. The results obtained from the numerical analysis show that instability in the tunnel is due to block falls from the roof and sidewalls. In view of this, various support systems were analyzed. This analysis shows that a combination of grouted rock bolt and shotcrete is the most suitable support system in Glandroud coal mine tunnel.
1 INTRODUCTION
The excavation of tunnels in coal mines causes instability, which may occur as a result of roof falls, wall failures or a combination of both. Therefore, in order to conduct safe mining operations, the stability of such tunnels is very important The prime concern in excavations is the control of displacements in the rock surrounding the excavation. In each excavation the design objective is to ensure that displacements of the rock around the excavation do not interfere with specified engineering activities (Pan et al. 1991).
Computer modeling for strata control and in rock mechanics has developed significantly in recent years. There are various numerical methods and codes available for stability analysis of tunnels. One of these methods İs the distinct element method, which has been developed for deformation and stability analysis of multiple-jointed rock masses around underground structures. Due to the structural features and geology of the Glandroud area, the distinct element method was used for stability analysis. The code utilized according to this method was UDEC. Many researchers have found UDEC to be a very powerful code when analyzing underground structures in various rock masses.
Download
*