Fully-mechanized caving mining process technology with large mining height in super-high seam (14-20m)

Abstract

The invention provides a coal mining method of fully-mechanized caving mining with large mining height in a super-high seam, a coal caving process, reasonable type of a support, production capacity of equipment, comprehensive control measures of coal wall spalling of working face, a technical route for improving the recovery rate of the fully-mechanized caving face with the large mining height, and feasibility evaluation indexes (thickness of the seam, top coal cavability, coal wall stability and roof pressure strength) of the fully-mechanized caving mining with the large mining height, and further forms a whole set of fully-mechanized caving mining process technology with the large mining height. The coal mining method is that the coal cutting height is 4.2-4.8m; the length of the working face is 200-280m; and the web of a coal mining machine is 0.8-1m. The process technology can increase the coal cutting quantity by 43%, shorten the coal caving time by 9%, relatively reduce the coal caving quantity by 9%, improve the resource recovery rate by 5% and reduce the mining-caving ratio to below 1:3 by increasing the coal cutting height, and can further realize the relatively balanced production of mining and caving of the working face.

Description

technical field

[0001] The invention belongs to coal mining technology. Background technique

[0002] The recoverable reserves of thick coal seams in my country account for about 43% of the country's recoverable reserves, and the coal output of thick coal seams mined underground accounts for about 40% to 50% of the country's coal production every year. The development of my country's coal industry has an important impact. Since the 1980s, my country has conducted a large number of experimental studies on mechanized coal mining methods for thick coal seams, and gradually formed a Chinese thick coal seam mining technology system. mining.

[0003] 1. Layer-by-layer fully mechanized mining is to divide the thick coal seam into several medium-thickness (2.0-3.0m) layers, and carry out longwall fully mechanized mining on each layer in turn. Layered mining is a mature technology, but the production process is complicated, the roadway excavation has a large amount of engineering, a...

Examples

Embodiment 1

[0086] Example 1 This project is used on the 8105 side of Tashan Mine of Tongmei Group

[0087] The coal mining method of large mining height and fully mechanized caving mining in extra-thick coal seams is that the coal cutting height is 4.8 meters; the length of the working face is 207 meters; the cutting depth of the shearer is 0.8 meters.

[0088] The coal discharge process is as follows: the coal discharge step is one mining and one discharge; the coal discharge method is 2 people and 2 rounds of coal discharge in sequence.

[0089] The reasonable frame type of the fully-mechanized caving support for large mining height in extra-thick coal seams is the four-column support shielding type, the maximum support height of the support reaches 5.2 meters, and the working resistance of the support is 15000KN; The top-coal caving support stabilizes the mechanism and maintains a spacious pedestrian space between the front and rear connecting rods.

[0090] The equipment production ...

Embodiment 2

[0097] Example 2 at the 8106 and 8107 sides of Tashan Mine of Tongmei Group

[0098] The coal mining method of large mining height and fully mechanized caving mining in extra-thick coal seams is that the coal cutting height is 4.2 meters; the working face length is 250 meters; the shearer cutting depth is 1 meter.

[0099] The coal discharge process is as follows: the coal discharge step is one mining and one discharge; the coal discharge method is 2 people and 2 rounds of coal discharge in sequence.

[0100] The reasonable frame type of the fully-mechanized caving support for large mining height in extra-thick coal seams is the four-column support shielding type, the maximum support height of the support reaches 5.2 meters, and the working resistance of the support is 15000KN; The top-coal caving support stabilizes the mechanism and maintains a spacious pedestrian space between the front and rear connecting rods.

[0101] The equipment production capacity is: coal shearer 2000...

Embodiment 3

[0108] Embodiment 3 is used in the 8108 face of Tashan Mine of Tongmei Group.

[0109] The coal mining method of large mining height and fully mechanized caving mining in extra-thick coal seams is that the coal cutting height is 4.5 meters; the length of the working face is 280 meters; the shearer cutting depth is 1 meter.

[0110] The coal discharge process is as follows: the coal discharge step is one mining and one discharge; the coal discharge method is 2 people and 2 rounds of coal discharge in sequence.

[0111] The reasonable frame type of the large mining height fully-mechanized caving support in extra-thick coal seams is the four-column support shielding type, the maximum support height of the support reaches 5.2 meters, and the working resistance of the support is 16500KN; The top-coal caving support stabilizes the mechanism and maintains a spacious pedestrian space between the front and rear connecting rods.

[0112] The equipment production capacity is: coal shear...

technical field

[0001] The invention belongs to coal mining technology. Background technique

[0002] The recoverable reserves of thick coal seams in my country account for about 43% of the country's recoverable reserves, and the coal output of thick coal seams mined underground accounts for about 40% to 50% of the country's coal production every year. The development of my country's coal industry has an important impact. Since the 1980s, my country has conducted a large number of experimental studies on mechanized coal mining methods for thick coal seams, and gradually formed a Chinese thick coal seam mining technology system. mining.

[0003] 1. Layer-by-layer fully mechanized mining is to divide the thick coal seam into several medium-thickness (2.0-3.0m) layers, and carry out longwall fully mechanized mining on each layer in turn. Layered mining is a mature technology, but the production process is complicated, the roadway excavation has a large amount of engineering, a...

Examples

Embodiment 1

[0086] Example 1 This project is used on the 8105 side of Tashan Mine of Tongmei Group

[0087] The coal mining method of large mining height and fully mechanized caving mining in extra-thick coal seams is that the coal cutting height is 4.8 meters; the length of the working face is 207 meters; the cutting depth of the shearer is 0.8 meters.

[0088] The coal discharge process is as follows: the coal discharge step is one mining and one discharge; the coal discharge method is 2 people and 2 rounds of coal discharge in sequence.

[0089] The reasonable frame type of the fully-mechanized caving support for large mining height in extra-thick coal seams is the four-column support shielding type, the maximum support height of the support reaches 5.2 meters, and the working resistance of the support is 15000KN; The top-coal caving support stabilizes the mechanism and maintains a spacious pedestrian space between the front and rear connecting rods.

[0090] The equipment production ...

Embodiment 2

[0097] Example 2 at the 8106 and 8107 sides of Tashan Mine of Tongmei Group

[0098] The coal mining method of large mining height and fully mechanized caving mining in extra-thick coal seams is that the coal cutting height is 4.2 meters; the working face length is 250 meters; the shearer cutting depth is 1 meter.

[0099] The coal discharge process is as follows: the coal discharge step is one mining and one discharge; the coal discharge method is 2 people and 2 rounds of coal discharge in sequence.

[0100] The reasonable frame type of the fully-mechanized caving support for large mining height in extra-thick coal seams is the four-column support shielding type, the maximum support height of the support reaches 5.2 meters, and the working resistance of the support is 15000KN; The top-coal caving support stabilizes the mechanism and maintains a spacious pedestrian space between the front and rear connecting rods.

[0101] The equipment production capacity is: coal shearer 2000...

Embodiment 3

[0108] Embodiment 3 is used in the 8108 face of Tashan Mine of Tongmei Group.

[0109] The coal mining method of large mining height and fully mechanized caving mining in extra-thick coal seams is that the coal cutting height is 4.5 meters; the length of the working face is 280 meters; the shearer cutting depth is 1 meter.

[0110] The coal discharge process is as follows: the coal discharge step is one mining and one discharge; the coal discharge method is 2 people and 2 rounds of coal discharge in sequence.

[0111] The reasonable frame type of the large mining height fully-mechanized caving support in extra-thick coal seams is the four-column support shielding type, the maximum support height of the support reaches 5.2 meters, and the working resistance of the support is 16500KN; The top-coal caving support stabilizes the mechanism and maintains a spacious pedestrian space between the front and rear connecting rods.

[0112] The equipment production capacity is: coal shear...