Medium-depth hole V-shaped detonating method suitable for underground sill-pillar-free segmented caving method

Abstract

The invention discloses a medium-depth hole V-shaped detonating method suitable for an underground sill-pillar-free segmented caving method, relates to the technical field of mining and solves the problems that medium-depth holes in existing ore mining are limited in use due to in-row sequential millisecond blasting, are liable to cause secondary blasting and a suspended top. The medium-depth holeV-shaped detonating method comprises the following steps: forming several rows of medium-depth holes for blasting in the top of a tunnel; determining a first blasting hole according to the line of least resistance; in the blasting direction, setting the first blasting hole as a starting point, and sequentially enabling several rows of medium-depth holes to be along a blasting route for blasting according to a V-shaped line; filling a detonator tube in each medium-depth hole by selecting blasting delay time between adjacent V-shaped lines according to the blasting route; and filling the medium-depth holes for blasting the detonator tubes. After blasting, ore is uniform in lumpiness and low in large lump rate, so that the secondary blasting cost is reduced, a suspended top rate is effectively reduced, an ore recovery rate is increased, and stability of a top plate on the operation site is ensured.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a V-shaped detonation method used for medium-deep hole blasting in underground pillar-less segmented caving methods. Background technique [0002] At present, in mining, medium and deep hole blasting operations all adopt the method of row-to-row sequential differential blasting, that is, the medium and deep holes are blasted in row by row. [0003] However, in mining, there are many limitations in the application of inter-row sequence differential blasting. For example, in the recovery of roadways along veins and the closure of cutting roadways, the use of conventional sequential differential blasting methods between rows can easily produce large pieces of ore and cause ore mining. The mouth of the roadway along the vein is blocked; when continuous pushing and rowing occurs during the withdrawal process of the roadway along the vein or when a fault crack is encountered, the normal...

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Problems solved by technology

[0004] The object of the present invention is: in order to solve the problems of limited use of row-to-row sequential micro-difference blasting in medium and deep holes in the existing ore mining, and easy to cause secondary blasting and abnormal problems such as suspended ceilings, the present invention provides an underground pillar-less submersible Medium-deep hole V-shaped detonation method of segmental caving method

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