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Is it allowed to drill footage without anchor cable in coal mine?
It is not allowed to drill footage in coal mine without anchor cable.
The function of anchor cable is to support the roof and two sides. The basic principle of rock-soil anchorage is to transfer the tensile force of the structure by using the shear strength of the rock-soil around the anchor cable to maintain the stability of the excavation face. Because of the use of anchor cable, it can provide resistance acting on the structure to bear external loads.
Footage refers to the driving footage (driving distance) of coal mine, which is a term in coal mine industry. Another organization corresponds to the mining footage, which refers to the progress of a coal mine's mining face.
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