Mine exploitation based on stoping, separation and filling control

Patent metadata

Field	Value
Publication number	US-11143025-B2
Application number	US-201916608920-A
Country	US
Kind code	B2
Filing date	Apr 1, 2019
Priority date	Sep 30, 2018
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A mine exploitation method based on stoping, separation and filling control is disclosed herein. The method includes deploying a gangue-less coal mining system; choosing a suitable coal and gangue separation method according to a separation requirement; choosing a suitable filling method according to mine geology, production conditions and rock stratum control requirement; reversely calculating a filling rate according to gangue discharge requirement and control indexes by utilizing theoretical calculation, simulation and experiment; determining a filling process and a separation process according to the filling rate; and feeding back and adjusting the filling process and separation process parameters by monitoring filling and control effect indexes.

First claim

What is claimed is:

1. A method of exploiting a mine, comprising:
step 1: mining, using a shearer of a gangue-less coal mining system, along an edge of a coal seam to reduce gangue generated during mining in a working face, and excavating more coal roadways than rock roadways in number to reduce an output of gangue;
step 2: choosing a coal and gangue separation method according to a sorting capacity of the mine, precision requirement, a coal gangue grain size range, size limitation of a separation chamber, complexity of separation processes and equipment cost;
step 3: choosing a filling method according to geological conditions of the coal seam, mine production capability requirement, rock stratum control requirement, supply quantity of filling materials and an economic budget;
step 4: calculating filling rate control requirements according to gangue discharge requirement and theoretical calculation, numerical simulation and physical simulation of equivalent mining height, height of a water flowing fractured zone to be reached and immediate roof deflection, wherein a belt weigher and a roof dynamic monitor are arranged to monitor a filling rate;
step 5: determining a filling process and a separation process according to the filling rate control requirements obtained in the step 4; and
step 6: further feeding back and adjusting filling process parameters and separation process parameters, the filling process parameters comprising tamping force, the number of times of tamping, gangue grain size grading and tamping angle, and the separation process parameters comprising separable grain size, by monitoring a mass ratio of filling to mining, roof subsidence, a height of mining induced water-conducting fissures, coal and rock mass strain energy density and ground subsidence; adjusting the filling process parameters and the separation process parameters as determined by monitoring the filling rate via the belt weigher and the roof dynamic monitor.

2. The mine exploitation method according to claim 1 , wherein, an underground coal and gangue separation method comprises a moving sieve jigging method, a water-medium cyclone separation method, and any combination thereof.

3. The mine exploitation method according to claim 2 , wherein, the gangue filling method in the step 3 comprises gangue-throwing filling, mechanized dense solid filling, cemented filling, and filling-coordinated caving type mixed fully-mechanized mining.

4. The mine exploitation method according to claim 3 , wherein, the value ranges of the filling process parameters are as follows: the number of times of tamping is two to six, and when the filling rate is high, a higher than 85%, a value higher than 3 is chosen; the natural repose angle of a filling body is 34° to 60°, and is determined by the filling material; the tamping force is 2 MPa to 4 MPa, and when the filling rate is higher than 85% a value higher than 3 is chosen; a discharge height is expressed as: (coal mining height−bottom dumping type scraper conveyer suspension height)×pilling coefficient, wherein, the mining height and the bottom dumping type scraper conveyer suspension height are determined by specific mine conditions and specific equipment size, and the value range of the pilling coefficient is 0.6 to 0.9.

5. The mine exploitation method according to claim 2 , wherein, the value ranges of the filling process parameters are as follows: the number of times of tamping is two to six, and when the filling rate is high, a higher than 85%, a value higher than 3 is chosen; the natural repose angle of a filling body is 34° to 60°, and is determined by the filling material; the tamping force is 2 MPa to 4 MPa, and when the filling rate is higher than 85% a value higher than 3 is chosen; a discharge height is expressed as: (coal mining height−bottom dumping type scraper conveyer suspension height)×pilling coefficient, wherein, the mining height and the bottom dumping type scraper conveyer suspension height are determined by specific mine conditions and specific equipment size, and the value range of the pilling coefficient is 0.6 to 0.9.

6. The mine exploitation method according to claim 1 , wherein:
(a) when ground subsidence is to be controlled, the step 4 further comprises: analysis of ground subsidence control requirement, collection of mine geology, prediction of ground subsidence consequences under different filling rates, and reverse calculation of a filling rate value according to the ground subsidence control requirement;
(b) when rock burst is to be controlled, the step 4 further comprises: analysis of the influence of a filling rate on the deflection, fracture distance and strain energy density of a roof ahead of a working face by a mechanical analysis, physical analog simulation or numerical simulation method, obtainment of a critical filling rate capable of reducing the intensity of rock burst and a critical filling rate capable of preventing the roof from being fractured, and determination of a filling rate in consideration of filling efficiency and control effect; and
(c) when an aquifer is to be controlled, the step 4 further comprises: determination of a maximum height of mining induced water-conducting fissures allowed to be produced, creation of a filling mining numerical simulation model, a mechanical model or a physical analog simulation model according to collected mine data, analysis of the height of mining induced water-conducting fissures under different filling rates, and obtainment of the height of mining induced water-conducting fissures and the filling rate.

7. The mine exploitation method according to claim 6 , wherein, the value ranges of the filling process parameters are as follows: the number of times of tamping is two to six, and when the filling rate is high, a higher than 85%, a value higher than 3 is chosen; the natural repose angle of a filling body is 34° to 60°, and is determined by the filling material; the tamping force is 2 MPa to 4 MPa, and when the filling rate is higher than 85% a value higher than 3 is chosen; a discharge height is expressed as: (coal mining height−bottom dumping type scraper conveyer suspension height)×pilling coefficient, wherein, the mining height and the bottom dumping type scraper conveyer suspension height are determined by specific mine conditions and specific equipment size, and the value range of the pilling coefficient is 0.6 to 0.9.

8. The mine exploitation method according to claim 1 , wherein, the value ranges of the filling process parameters are as follows: the number of times of tamping is two to six, and when the filling rate is higher than 85%, a value higher than 3 is chosen; the natural repose angle of a filling body is 34° to 60°, and is determined by the filling material; the tamping force is 2 MPa to 4 MPa, and when the filling rate is higher than 85% a value higher than 3 is chosen; a discharge height is expressed as: (coal mining height−bottom dumping type scraper conveyer suspension height)×pilling coefficient, wherein, the mining height and the bottom dumping type scraper conveyer suspension height are determined by specific mine conditions and specific equipment size, and the value range of the pilling coefficient is 0.6 to 0.9.

Assignees

• Univ China Mining
• Xuzhou Zhongkuang Backfilling & Mining Tech Co Ltd

Inventors

• Zhang Jixiong
• Zhang Qiang
• Wu Zhongyu
• Ju Feng
• Wang Jiaqi
• Chen Yang

Classifications

• E21F15/00

  Methods or devices for placing filling-up materials in underground workings (dams E21F17/103 {; chocks made of flexible containers filled with backfilling material E21D15/483}) · CPC title

• E21F15/06

  Filling-up mechanically · CPC title

• E21C41/18 Primary

  for brown or hard coal · CPC title

• E21F15/005

  characterised by the kind or composition of the backfilling material · CPC title

• E21C41/00 Primary

  Methods of underground or surface mining (E21C45/00 takes precedence); Layouts therefor (for peat E21C49/00) · CPC title