CN-120444024-B - Near-vertical super-thick coal seam mining, discharging and filling process flow cooperative method

CN120444024BCN 120444024 BCN120444024 BCN 120444024BCN-120444024-B

Abstract

A collaborative method for the working procedures of the near-vertical super-thick coal seam mining and discharging includes such steps as dividing the near-vertical super-thick coal seam into multiple segments, respectively building low-position mining and discharging systems at the bottoms of segments, respectively building high-position filling systems at the horizontal positions of the top interfaces of segments, mining coal and discharging coal by coal mining machine and supporting frame in the period of coal mining, synchronously laying isolating net on goaf by supporting frame in the process of moving it along with machine, advancing a slurry-blocking cloth by supporting frame in advance, filling slurry in goaf by high-position filling process lane, filling chamber and filling hole, maintaining near-vertical surrounding rock, ensuring the safety and depth of mining, and effectively solving the problems of difficult control of surrounding rock instability, difficult control of ground cut type subsidence and low coal resource mining rate.

Inventors

ZHANG JIXIONG
ZHANG QIANG
FANG KUN
JU FENG
Zong Tingcheng
YANG KANG
CUI PENGFEI
BAI YU
DENG PANBO

Assignees

中国矿业大学

Dates

Publication Date: 20260512
Application Date: 20250627

Claims (7)

1. The process flow cooperative method for the near-vertical super-thick coal seam mining and discharging and charging is characterized by comprising the following steps of: Dividing a near-vertical super-thick coal seam into a plurality of horizontal sections, respectively establishing a low-level mining and releasing system at the bottoms of the plurality of horizontal sections, and respectively establishing a high-level filling system at the horizontal positions of the top interfaces of the plurality of horizontal sections; The method comprises the following steps of coal mining time period and filling time period, after the low-level mining and releasing system is established, coal mining and coal releasing are carried out on horizontal segments through a coal mining machine and a top coal filling mining lapping slurry blocking support in the coal mining time period, an isolation net is paved on a goaf through the top coal filling mining lapping slurry blocking support in the advancing process of the coal mining machine, a filling step distance is pushed, the top coal filling mining lapping slurry blocking support is unfolded to block slurry, then three-dimensional detection is carried out on the goaf through a detection device in the filling time period to obtain the spatial profile shape, the volume and the coal yield of the goaf, pulping work is carried out according to the obtained information, and slurry is sequentially injected into the goaf through a high-level filling process roadway, a filling chamber and a filling detection hole in the filling time period; The low-level mining and discharging system comprises a coal mining machine, a front scraper conveyor, a rear scraper conveyor and a top coal discharging, filling, mining, lapping and slurry blocking support, wherein the coal mining machine is used for carrying out coal mining work on coal in horizontal sections, the top coal discharging, lapping and slurry blocking support is used for discharging coal in horizontal sections, and a goaf bottom plate formed after coal discharging is paved with a separation net, and the slurry blocking and separating cloth is unfolded in the process of filling the goaf so as to ensure that slurry cannot leak in the filling process and influence a working face; The high-level filling system comprises a high-level filling process roadway, a filling chamber, filling detection holes and a pulping system, wherein the filling chamber is uniformly arranged in the high-level filling process roadway, the filling detection holes are communicated with the filling chamber and the goaf, the pulping system is respectively connected with the filling chamber through the high-level filling process roadway, and the pulping system is used for preparing filling pulp, and transporting the pulp to the filling chamber through the high-level filling process roadway so as to fill the goaf; The low-level mining and discharging system is configured to sequentially perform cyclic work of bottom coal cutting, top coal discharging and net laying on horizontal sections by a coal cutter in a coal mining period, and spread slurry blocking cloth by a net laying slurry blocking bracket after the coal mining period is completed; The high-level filling system is arranged before the corresponding horizontal section coal mining, the high-level filling system is configured to perform three-dimensional detection on the goaf through a filling detection hole at first in a filling period, the pulping system receives detection information of the detection device and then sequentially injects filling slurry into the goaf through a high-level filling process roadway, a filling chamber and the filling detection hole, and the filling detection hole is sealed and the goaf slurry is subjected to standing solidification after grouting is completed; the method comprises the steps of establishing a low-level mining and releasing system, wherein a cutting hole, a conveying roadway, a return air roadway, a connecting roadway, an auxiliary conveying roadway, a conveying cis-slot and a return air cis-slot are dug at the bottom of a current horizontal section, the conveying cis-slot is communicated with the conveying roadway and the current horizontal section, the return air cis-slot is communicated with the auxiliary conveying roadway and the return air roadway and the current horizontal section, the connecting roadway is communicated with the return air cis-slot, a protection coal pillar is reserved between the conveying cis-slot and the return air cis-slot, and the cutting hole is positioned at the boundary of the protection coal pillar.
2. The collaborative method for the process flow of the near-vertical ultra-thick coal seam mining and discharging charging procedure according to claim 1, wherein the horizontal section height is 20-40m, the machine mining height of a coal mining machine is 2.5-4m, and the charging step distance is one time charging after the bottom coal is mined by 3-8 cutters and the top coal discharging is completed.
3. The collaborative method for the process flow of the near-vertical ultra-thick coal seam mining and discharging and filling process according to claim 1, wherein the low-level mining and discharging system detects the slurry filled in the previous filling period before coal mining, ensures that the slurry filled in the previous filling period is solidified, and controls the stability of the filling body through a displacement monitoring optical fiber.
4. The collaborative method for the mining and discharging filling process flow of the near-vertical ultra-thick coal seam according to claim 1, wherein the adjacent horizontal segments adopt a staggered filling process, so that the segmented filling bodies form a staggered block structure, and the widths of the blocks are 3-8 m.
5. The near-vertical ultra-thick coal seam mining, discharging and filling process flow collaborative method according to claim 1, wherein the caving coal filling, mining, lapping and slurry blocking bracket comprises a caving coal hydraulic bracket, an automatic lapping device and an isolating and slurry blocking device; The hydraulic support for caving the roof is composed of a reverse four-bar support main body, a split type shield beam mechanism and a coal caving mechanism; The anti-four-bar support main body comprises a bearing beam, an anti-four-bar mechanism, two groups of hydraulic upright posts and a base, wherein the anti-four-bar mechanism is hinged with the bearing beam, the hinge angle is designed to be 15-45 degrees, and the two groups of hydraulic upright posts comprise two front upright posts and two rear upright posts which are respectively hinged with the bearing beam and the base.
6. The near-vertical extra-thick coal seam mining and filling process flow collaborative method according to claim 5, wherein the split type shield beam mechanism comprises a shield beam, a shield Liang Shengjiang upright post, a shield Liang Shengjiang oil cylinder and a shield beam swing angle oil cylinder, wherein the shield beam lifting upright post is hinged with the shield beam, and the shield beam lifting oil cylinder and the shield beam swing angle oil cylinder are respectively hinged with the shield beam and a base; the coal discharging mechanism comprises a plugboard and a plugboard telescopic cylinder, wherein the plugboard is inserted into the shield beam after the plugboard is inserted into the shield beam, and the plugboard can be telescopic through the plugboard telescopic cylinder.
7. The collaborative method for the near-vertical ultra-thick coal seam mining and discharging filling process flow according to claim 1 is characterized by further comprising a filling device which is fixed in a filling chamber and comprises a telescopic pipeline for conveying filling slurry to a goaf, wherein the telescopic pipeline is provided with a flow sensor, a high-definition camera, a pressure sensor and an explosion-proof monitor, the flow sensor is used for monitoring slurry flow in real time so as to regulate and control slurry concentration and diffusivity, the high-definition camera is used for monitoring grouting state in real time and collecting filling state images, the pressure sensor is used for monitoring the pressure of the telescopic pipeline, and the explosion-proof monitor is used for integrally controlling flow and pressure parameters.

Description

Near-vertical super-thick coal seam mining, discharging and filling process flow cooperative method Technical Field The invention belongs to the technical field of coal mining, and particularly relates to a near-vertical super-thick coal seam mining and filling process flow collaborative method. Background In the existing horizontal sectional fully-mechanized caving mining method, bottom coal is mechanically cut and top coal is discharged, an oversized high-suspension space is formed, near-vertical surrounding rock is out of support, and the hidden surrounding rock suddenly unstably causes great disaster hidden trouble along with the increase of mining depth. The problems of difficult control of instability of surrounding rock in large space, difficult control of ground surface cutting type subsidence and difficult guarantee of coal resource mining rate exist, and the source mining method is urgently required to be changed so as to realize strategic high-quality coal resource safe mining. Filling mining is a reliable way to solve the problems, but the important difficulty of how efficient matching of the mining and filling process is required to be solved. Disclosure of Invention In order to overcome some of the above-mentioned problems, the present invention provides a method for cooperating the process flows of the mining and filling of the near-vertical ultra-thick coal seam, so as to at least partially solve the above-mentioned problems. According to the technical scheme, the invention provides a near-vertical ultra-thick coal seam mining, placing and filling process flow cooperative method, which comprises the following steps of: Dividing the nearly vertical super-thick coal seam into a plurality of horizontal sections, respectively establishing a low-level mining and releasing system at the bottoms of the plurality of horizontal sections, and respectively establishing a high-level filling system at the horizontal positions of the top surfaces of the plurality of horizontal sections; The method comprises the following steps of coal mining and coal discharging in a horizontal section through a coal mining machine and a top coal discharging and filling mining hydraulic support after the low-level mining and discharging system is established, paving an isolation net on a goaf through a top coal discharging and filling mining net-paving slurry blocking support in the advancing process of the coal mining machine, spreading slurry blocking cloth through the top coal discharging and filling mining net-paving slurry blocking support after the next filling step distance is reached and the coal mining machine stops working, then three-dimensionally detecting the goaf through a detection device in the filling period to obtain the spatial profile shape, the volume and the coal quantity of the goaf, performing slurry making work according to the obtained information, and sequentially injecting slurry into the goaf through a high-level filling process roadway, a filling chamber and a filling detection hole in the filling period; The low-level mining and discharging system comprises a coal mining machine and a top coal discharging and filling mining lapping slurry blocking support, wherein the coal mining machine and the top coal discharging and filling mining lapping slurry blocking support are used for mining coal and discharging coal in horizontal sections, the top coal discharging and filling mining lapping slurry blocking support is used for paving an isolation net on a goaf bottom plate formed after the coal discharging of the horizontal sections, and the slurry blocking isolation cloth is unfolded in the process of filling the goaf so as to ensure that slurry cannot leak in the filling process and influence the coal mining machine; the high-level filling system comprises a high-level filling process roadway, a filling chamber, filling detection holes and a pulping system, wherein the filling chamber is uniformly arranged in the high-level filling process roadway, the filling detection holes are communicated with the filling chamber and the goaf, the pulping system is respectively connected with the filling chamber through the high-level filling process roadway, and the pulping system is used for preparing filling pulp, and transporting the pulp to the filling chamber through the high-level filling process roadway so as to fill the goaf. Further, the horizontal sectional height is 20-40m, the mechanical mining height of the coal mining machine is 2.5-4m, the mining and filling step distance is (3-8): 1, namely, the filling step distance is 3-8 cutter coals, the coal discharging step distance is usually 2-3 cutter bottom coals, then the top coals are discharged once, namely, the goaf is filled once after 3-8 cutter coals are discharged, and the cooperation of the mining and discharging and filling procedures is realized. Further, the low-level mining and discharging system is configured to sequentially perform b