Mine pressure causes do support work in coal mine
Date:2013-11-29 Hits:
Mine pressure in no prior to mining is in a state of equilibrium, mining activity underground coal mine broke the balance leads to the deformation, fracture, displacement of surrounding rock, until the collapse, and even cause coal mine safety accident. A correct understanding of mine pressure, make effective support to ensure safe production of coal mine.
The formation of coal mine pressure in different places to form different, to seriously understand why every place is formed, the corresponding support measures.
1 top pressure formation
Roadway, roof exposed to form a rock beam. Because the rock beam upper strata and rock beam weight function, will produce bending, the bending is often larger in the roadway in the middle, two sides roadway roof and small; from the roof near the upper strata bending, from the upper strata roof far bending, due to bending, rock layer is will produce tensile, fracture in section bending will be big. When further increasing pressure, between the upper and lower strata there will be cracks, called separation. Immediately after the laneway support, support with its own capacity to prevent or reduce the rock deformation and movement. This part of the rock pressure on the support force, called the top pressure.
The formation of the lateral pressure
Side refers to the two sides roadway to support pressure, it is due to the two to help rock or coal roadway within the compression and the formation of. Tunnel digging, in two to help form the support pressure, when the bearing pressure exceeds the strength, will to tunnel middle extrusion. The deformation of the roadway two help gradually moved closer, if the two sides roadway supporting or not supporting the filling defect. The deformation is not controlled, it will cause to continue. Help, the newly exposed two gangs continue to drift out intermediate, which continue to help, at this time, the pressure will increase rapidly. If the rigid support roadway use cannot be compressed, to control the two sides roadway near, the deformation is not serious, this kind of bracket can obtain good results; and when the pressure exceeds the awning leg or walls can withstand the pressure, the awning leg will be deformed, broken or damaged walls.
The formation of the bottom pressure
In the tunnel under the action of internal pressure, the bottom will produce lateral pressure, and generates the upward bottom pressure, the bottom up, separation, bent or broken. Some rocks such as tuff, argillaceous rock, when the tunnel water there, or the air is humid, will make the rock swelling and floor heave in bottom pressure. On the floor, in addition to the rock bottom weight itself is to prevent the floor to muster the strength, often bracket bottom beam to stop the bottom drum. So sometimes the floor to take to sink, two for near far more easily than the roof, is much more serious.
Have a clear understanding of the mine pressure on coal mine, for different reasons to use way support, ensure the safety of coal mine. Know the unstable factors of coal mine safety.
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