A: Access to the ditch is the channel that connects the upper and lower levels;
Open trenches are trenches that provide initial working space for the mining of new steps.
The main parameters of the trench:
(1) The width of the bottom of the ditch. The width of the bottom of the ditch depends on the method of transporting the trench, the number of lines in the trench, the physical and mechanical properties of the rock, and the specifications of the mining equipment;
(2) the depth of the trench;
(3) The slope angle of the trench. The slope angle of the ditch depends on the physical and mechanical properties of the rock mass and the length of the damp slope retention time;
(4) The longitudinal slope of the ditch. The longitudinal slope of the access trench is determined according to the type of transport equipment used in the trench and the use of the trench;
(5) The length of the groove. The length of the access groove depends on the height of the step and the longitudinal slope of the access groove.
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