After the quasi-alignment, firstly, in the center of the nugget, a cutting trough is opened at the full height of the bottom as a free surface for the bottom; then in the rock tunnel and the pull tunnel, the horizontal blasthole and the fan-shaped blasthole are respectively used. Drilling and blasting work can form a flat bottom.
Another construction method for forming a flat bottom structure is to use a medium-deep hole excavation method as shown in the following figure. (B) Deep hole construction method for water use: (shallow water combined with medium and deep holes)
Another method is to cut copper mine Redhill example (a few lines, the level of combined method of deep digging flat bottom).
(a) Characteristics of the flat-bottom structure - the level of the bottom of the flat-bottom structure is at the same level as the level of secondary crushing. The collected ore forms a triangular heap at the level of the bottom. The above ore is slid into the electric roadway by the heavy ore discharge. (In essence, the flat-bottom structure always expands on the basis of the trench.)
(ii): Advantages and disadvantages of flat-bottom structure:
<Advantages>: 1 simplifies the bottom structure; 2 reduces the amount of mining work; 3 improves the efficiency of cutting work; 4 improves the conditions of ore mining; 5 reduces the amount of bottom column.
<Disadvantages>: 1 The triangular ore pile on the bottom column cannot be recovered in time, and it can be recycled when the next stage is returned to the mining pile. With this form, the ore loss is increased. 2 The cutting of the bottom column is very powerful.
(iii): Applicable conditions - When the ore is fairly stable, a flat bottom structure can be used.
(c) A method of excavating with a vertically upward fan-shaped blasthole.
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