What regulations should be met in the case of wall caving mining?
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2. When mining multi-layer ore bodies or single-layer ore bodies with large changes in production, the transport lanes should be arranged outside the chassis; when the production is relatively regular single-layer mines, and the production scale is small, single-stage mining, transportation is flat. The lane can be arranged in the vein; when the multi-layer ore body is layered and recovered, the lower layer should be recovered after the upper roof rock collapses and stabilizes;
3. When the ore body and the chassis rock are not stable enough, the stage transportation roadway shall be arranged outside the chassis vein, and the pressure arch base of the empty area shall be avoided;
4. When the two adjacent stages are simultaneously harvested, the working face of the upper stage should be inclined by a working face of the working face in the lower stage, and should not be less than 20m ;
5. When the longwall caving method adopts the stepped mining face, the lower step should be 1 to 2 times longer than the upper step ;
6. When the inclination angle of the ore body is 25° to 30° , it is advisable to adopt a pseudo-tilt mining face;
7. The control top distance and top clearance should be determined by the mining method test, and can also be determined according to the spacing of the pillars. The control top distance should be 2 to 3 rows of pillar spacing; the top spacing should be 1 to 5 rows of pillar spacing;
8. In the dense pillars, every 3m ~ 5m should have a safety exit with a width of not less than 0.8m . When the dense pillar is under excessive pressure, reinforcement measures should be taken in time; the roof that cannot be self-propelled after the column is removed should be 0.5m outside the dense pillar, re-burrowing and blasting to the discharge area, forced to collapse; mechanically withdrawing the column and manually withdrawing the column, should be carried out from the bottom up, from far and near; when the ore body inclination is less than 10° , the column sequence is removed Not limited to;
9. When the thickness of the direct roof caving rock layer of the ore body is less than 6 times to 8 times the thickness of the ore body , effective control of ground pressure and roof management measures shall be taken; after the roof is placed, the falling roof area shall be closed in time;
10. Wall-type caving mining method should promote the use of hydraulic props. 