Method for chemically softening rock to allow fully mechanized coal face to pass collapsed column

A technology of fully mechanized mining face and chemical softening, applied in surface mining, earthwork drilling, underground mining, etc., can solve the problems of poor economy and practicability, large amount of engineering, low work efficiency, etc., and achieve strong promotion and application value. , to ensure normal advancement and eliminate the effect of bracket movement
CN102720497BInactive Publication Date: 2014-08-27TAIYUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TAIYUAN UNIV OF TECH
Publication Date
2014-08-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for chemically softening rock to allow a fully mechanized coal face to pass a collapsed column. The method includes: drilling rock of the collapsed column, and filling chemical solution to dissolve and corrode mineral components of the rock of the collapsed column, thereby changing internal structure of the rock of the collapsed column, reducing inter-particle action of the rock of the collapsed column, lowering internal cohesion of the rock of the collapsed column and weakening mechanical strength of the rock of the collapsed column to soften the rock of the collapsed column; and selecting reasonable coal cutter web and work face cycle advance to allow the fully mechanized work face to pass the collapsed column. By the method, tunneling and supporting amount, coal loss amount and conveyance amount when the fully mechanized work face is subject to skipping, bypassing and directly passing through the collapsed column are reduced, difficulty in moving and replacement of a support and abutting of work faces, equipment damage caused by direct passage and the like are eliminated, and normal advance of the fully mechanized work face is guaranteed. The method is economic, practical, simple, quick, safe and reliable, guarantees low coal loss and has high popularization and application value.
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Description

technical field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for chemically softening rocks so that a fully mechanized mining face passes through a collapsed column. Background technique

[0002] The underlying limestone layer of the coal seam is dissolved by groundwater for a long time to form a cave, and the cave collapses under the action of the geological tectonic force and the gravity of the overlying strata to form a collapse column (also known as a carbon-free column). Karst collapse columns are widely distributed in the Carboniferous Permian coal measure strata in North my country, and are a common geological hazard in coal mine production. The collapse column runs through between the karst-developed Austrian ash and the coal-measure strata, and often becomes the connection channel between the Austrian ash and the coal-measure strata. Once the shaft or the coal mining face approaches or exposes the collapse...

Claims

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