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

Inactive Publication Date: 2014-08-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] The present invention provides a method for chemically softening rocks so that the fully mechanized mining face passes through the collapsed column, and aims to solve the problems of complicated process, large engineering workload and low work efficiency in the method of passing the fully mechanized mining face through the collapsed column provided by the prior art. It is difficult for the coal mining unit to efficiently cut the collapse column, waste of coal resources, poor economy and practicability

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

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Embodiment approach 1

[0054] I. Reference figure 2 and image 3 , Through geophysical prospecting, it is determined that the shape of the subsidence column 4 of a certain mine is approximately elliptical, with a major axis of 94m and a short axis of 80m, and the shortest distance between the subsidence column 4 and the returning wind trough 3 is 42.5m;

[0055] II. Drilling and sampling the collapsed column rocks. According to rock mechanics test procedures, the natural uniaxial compressive strength of the collapsed column rocks is 46.61MPa, the porosity is 3.57%, the water content is 2.45%, and the permeability coefficient is 6×10 -3 cm / s, using X-ray diffractometer to determine the mineral composition of the collapsed pillar rock: 76% of quartz, 11% of muscovite, 4% of kaolinite, and 9% of pearl clay;

[0056] III. According to the natural compressive strength and mineral composition of the collapsed pillar rock measured in the above II, the mass fraction of the collapsed pillar rock sample is ...

Embodiment approach 2

[0061] I. Reference Figure 4 and Figure 5 , Through geophysical prospecting, it is determined that the shape of the subsidence column 4 of a mine 2 is approximately elliptical, with a major axis of 114.5m and a short axis of 75m.

[0062] II. Drilling and sampling the collapsed column rocks, according to the rock mechanics test regulations, the natural uniaxial compressive strength of the rocks is 53.86MPa, the porosity is 2.36%, the water content is 2.49%, and the permeability coefficient is 2×10 -3 cm / s, using X-ray diffractometer to determine the mineral composition of the collapsed pillar rock: 79% of quartz, 14% of muscovite, 5% of kaolinite, and 2% of pearl clay;

[0063] III. According to the natural compressive strength and mineral composition of the collapsed column rocks measured by the above II, the mass fraction of the rock samples is 0.1% CaCl 2 Solution immersion test, the uniaxial compressive strength test was carried out on the standard specimens of the col...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 康天合赵国飞郭俊庆张文阳郭帅
Owner TAIYUAN UNIV OF TECH
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