Method for reserving functional coal pillar of steeply inclined fully mechanized coal mining face
By designing functional coal columns to buffer coal blocks at the lower end of the acute inclined working surface and adjust the working surface width, the problems of coal block impact damage and equipment stability control in the mining of acute inclined coal seams are solved, and safe and efficient coal seam mining is achieved.
Patent Information
- Application Number
- CN202410914992.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2024-12-17
AI Technical Summary
During the mining of the coal seam with sharp inclination angle, the coal slid under the working surface causes significant damage to the transportation lane, and the inclination adjustment stability control of the equipment of the sharp inclination surface is time-consuming and inefficient.
The functional coal column storage method is adopted for the sharp inclined comprehensive mining working surface. By obtaining coal rock mass samples and physical and mechanical parameters, the retaining size and volume of functional coal columns are designed, and functional coal is set up at the lower end of the working surface using a coal mining machine and hydraulic support. The column serves as a buffer for coal blocks, and the length of the coal column is adjusted by downward unidirectional cutting of coal to achieve adjustment of the working surface width.
It effectively reduces the impact of coal gangues falling from the upper part of the working surface on the transportation lane, improves mining efficiency and safety, saves working time, reduces economic losses, and provides safe and efficient technical means for the mining of coal seams with sharp inclination at large angles.
Smart Images
Figure CN119145859A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of steeply inclined working face arrangement, and in particular relates to a method for setting up functional coal pillars in a steeply inclined fully mechanized mining working face. Background Art
[0002] With the rapid development of the economy, the demand for coal is also rising rapidly. my country's raw coal production has increased from 1.86 billion tons in 2004 to 3.75 billion tons in 2019. It is estimated that the annual demand for coal will reach 3.5 billion tons from 2030 to 2050, accounting for more than 60% of the energy structure. The coal production in steeply inclined coal seams in my country has generally shown an upward trend, and the coal production in steeply inclined coal seams accounts for about 10% of the total coal production in the country. In about 82% of the coal mining areas in southern my country, steeply inclined coal seams exist. About 15% of the national key coal mines and 36% of the local small coal mines in the south mine steeply inclined coal seams.
[0003] With the advancement of my country's coal mining technology and the increase in mine mining intensity, high-quality coal resources with good shallow deposit conditions are becoming increasingly exhausted, and the main coal producing areas and coal consumption areas are extremely inconsistent. In order to ensure the economic development of the region and the sustainable development of the mining areas, relatively complex deposit conditions and steeply inclined coal seams with large dips are gradually entering the vision of coal mining companies in the southwest region.
[0004] In the mining process of steeply inclined coal seams with large dips, on the one hand, coal blocks sliding down the working face will cause serious damage to the transport tunnel at the port below the working face. Most steeply inclined mines use gangue retaining plates to mitigate the impact of falling coal blocks on the tunnel. However, due to the large dip angle of the coal seam, the impact force of falling coal blocks is large, the gangue retaining plates are greatly deformed and severely damaged, and need to be replaced frequently, which not only wastes working time, but also causes huge economic losses and certain safety risks. On the other hand, steeply inclined working faces often adopt a pseudo-inclined layout, and the width of the working face is achieved by controlling the pseudo-inclined angle, so that the working face equipment can be adjusted and the stability is controlled. The actual operation process is time-consuming and inefficient. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide a method for setting up functional coal pillars in a steeply inclined fully mechanized mining working face, which can buffer the self-sliding coal blocks in the steeply inclined working face, prevent impact damage to the transport tunnel at the lower end of the working face, and can realize the width adjustment of the steeply inclined working face, thereby providing spatial conditions for the inclination stability control of the steeply inclined working face equipment.
[0006] To achieve the above object, the present invention adopts the following technical solution:
[0007] A method for setting functional coal pillars in a steeply inclined fully mechanized mining face, comprising:
[0008] Step S1, obtaining a coal rock sample;
[0009] Step S2, obtaining physical and mechanical parameters of the coal and rock mass according to the coal and rock mass sample;
[0010] Step S3, according to the parameters of the steeply inclined fully mechanized mining face and the physical and mechanical parameters of the coal and rock mass, the loss rate of the functional coal pillar is obtained;
[0011] Step S4, preliminarily design the size and volume V0 of the functional coal pillar;
[0012] Step S5, through the steeply inclined fully mechanized mining working face production, obtain the remaining size and volume Vs of the functional coal pillar after one step of the working face;
[0013] Step S6: design the size of the functional coal pillar according to the remaining size Vs of the functional coal pillar and the designed volume V0.
[0014] Preferably, the physical and mechanical parameters of the coal rock mass include: uniaxial compressive strength, tensile strength, cohesion, internal friction angle, and density physical and mechanical parameters of the coal rock mass.
[0015] Preferably, in step S3, based on the parameters of the steeply inclined fully mechanized mining face and the physical and mechanical parameters of the coal and rock mass, a functional coal pillar impact loss rate test is performed to obtain the functional coal pillar loss rate.
[0016] As a preference, a corresponding steeply inclined working face simulation model is established, and the measured physical and mechanical parameters of the coal and rock mass are set to monitor the functional dimensions of the emergency inclined working face before and after a shift step, calculate the volume ratio of the functional coal pillar before and after a shift step, and obtain the functional coal pillar loss rate.
[0017] As a preferred option, if the remaining size V of the functional coal pillar is s If the remaining volume V0 of the functional coal pillar is less than 1 / 4 of the designed volume V0, then the size of the functional coal pillar is reasonable and does not need to be adjusted. s If it is greater than 1 / 4 of the design volume V0, the design functional coal pillar size will be updated, and the updated functional coal pillar volume V1 is the initial design functional coal pillar volume V0 minus the measured functional coal pillar volume V s The volume of the part that is in excess of 1 / 4 of the design volume and the size of the updated functional coal pillar are adjusted proportionally.
[0018] Preferably, the dimensions of the functional coal pillar include length, width and thickness; wherein the thickness is the coal mining thickness, the length is the dimension length along the working face advancement direction, and the width is the dimension length in the direction perpendicular to the working face.
[0019] Preferably, the functional coal pillar is located at the lower end of the working face and at the junction of the transport tunnel and the working face.
[0020] As a preferred method, the way to set up functional coal pillars in actual production is: use a coal mining machine to cut coal to the lower end of the working face and stop without cutting through the lower end, leaving the width direction of the functional coal pillar on the coal wall side of the lower end of the working face; and control the length direction of the functional coal pillar by adjusting the pushing distance of the scraper conveyor at the lower end of the working face.
[0021] This invention is applied to the mining of steeply inclined coal seams under complex geological conditions, realizing safe and efficient mining of steeply inclined coal seams with large dip angles. The working face is arranged in a downward pseudo-inclined manner. A functional coal pillar is left on the side of the working face close to the transport lane to buffer the coal gangue blocks sliding down from the upper part of the working face and provide space for the adjustment of the width change of the steeply inclined working face. The method adopts downward one-way coal cutting. The design of this method realizes safe and efficient mining of steeply inclined coal seams with large dip angles, improves the mining efficiency of the mine, and maintains the safety of the working face under such complex geological conditions. After adopting this technical solution, the mining technology system of steeply inclined coal seams with large dip angles is enriched, new technical ideas are proposed for the mining of steeply inclined coal seams, the impact of the coal gangue blocks sliding down from the upper part of the working face on the transport lane of the working face is reduced, working time is saved, and economic benefits are improved. It provides safer protection for workers when performing work such as moving frames and pushing slides, realizing safe and efficient mining of steeply inclined double-outburst coal seams with large dip angles, and providing important technical reference for the mining of similar steeply inclined coal seams in my country. It has a large prospect for promotion and application, and its scientific and engineering significance is huge. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0023] Figure 1 It is a flow chart of the method for setting up functional coal pillars in a steeply inclined fully mechanized mining working face according to the present invention;
[0024] Figure 2 It is a schematic diagram of the working plane of the present invention.
[0025] Among them, 1 is a coal mining machine, 2 is a hydraulic support, 3 is a functional coal pillar, 4 is a working face, 5 is a return air tunnel, 6 is a transport tunnel, and 7 is a single hydraulic support. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0028] Embodiment 1:
[0029] like Figure 1 As shown, an embodiment of the present invention provides a method for setting functional coal pillars in a steeply inclined fully mechanized mining working face, comprising:
[0030] Step S1, obtaining a coal rock sample;
[0031] Step S2, obtaining physical and mechanical parameters of the coal and rock mass according to the coal and rock mass sample;
[0032] Step S3, according to the parameters of the steeply inclined fully mechanized mining face and the physical and mechanical parameters of the coal and rock mass, the loss rate of the functional coal pillar is obtained;
[0033] Step S4, preliminarily design the size and volume V0 of the functional coal pillar;
[0034] Step S5: Obtain the remaining size and volume V of the functional coal pillar after one step of the working face through steeply inclined fully mechanized mining face production s ;
[0035] Step S6: According to the remaining size V of the functional coal pillar s And the design volume V0, the design size of the functional coal pillar.
[0036] As an implementation method of the present invention, the functional coal pillar is located at the lower end of the working face and at the junction of the transport tunnel and the working face, specifically, as follows: Figure 2 As shown,
[0037] The working face 4 is a steeply inclined working face, which adopts a pseudo-inclined arrangement, that is, the return air tunnel 5 is arranged ahead of the transport tunnel 6. The upper end of the working face is the intersection of the return air tunnel 5 and the working face 4, and the lower end of the working face is the intersection of the transport tunnel 6 and the working face 4. The working face is arranged with a coal mining machine 1, a hydraulic support 2, a functional coal pillar 3 near the lower end of the working face, and a single hydraulic support 7 for supporting the roof.
[0038] As an implementation method of an embodiment of the present invention, the physical and mechanical parameters of the coal rock mass include: uniaxial compressive strength, tensile strength, cohesion, internal friction angle, and density physical and mechanical parameters of the coal rock mass.
[0039] As an implementation method of an embodiment of the present invention, in step S3, based on the parameters of the steeply inclined fully mechanized mining working face and the physical and mechanical parameters of the coal and rock mass, a functional coal pillar impact loss rate test is performed to obtain the functional coal pillar loss rate.
[0040] As an implementation method of an embodiment of the present invention, a corresponding steeply inclined working face simulation model is established, and the measured physical and mechanical parameters of the coal and rock mass are set to monitor the functional dimensions of the emergency inclined working face before and after a shift step, calculate the volume ratio of the functional coal pillar before and after a shift step, and obtain the functional coal pillar loss rate.
[0041] As an implementation method of the present invention, if the remaining size V of the functional coal pillar is s If the remaining volume V0 of the functional coal pillar is less than 1 / 4 of the designed volume V0, then the size of the functional coal pillar is reasonable and does not need to be adjusted. s If it is greater than 1 / 4 of the design volume V0, the design functional coal pillar size will be updated, and the updated functional coal pillar volume V1 is the initial design functional coal pillar volume V0 minus the measured functional coal pillar volume V s The volume of the part that is in excess of 1 / 4 of the design volume and the size of the updated functional coal pillar are adjusted proportionally.
[0042] Preferably, the dimensions of the functional coal pillar include length, width and thickness; wherein the thickness is the coal mining thickness, the length is the dimension length along the working face advancement direction, and the width is the dimension length in the direction perpendicular to the working face.
[0043] As an implementation method of an embodiment of the present invention, the way to set up a functional coal pillar in actual production is: use a coal mining machine to cut coal to the lower end of the working face and stop, do not cut through the lower end, and leave the width direction of the functional coal pillar on the coal wall side of the lower end of the working face; by adjusting the pushing distance of the scraper conveyor at the lower end of the working face, the length direction of the functional coal pillar is controlled.
[0044] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A method for setting up functional coal pillars in a steeply inclined fully mechanized mining face, characterized in that: include: Step S1, obtaining a coal rock sample; Step S2, obtaining physical and mechanical parameters of the coal and rock mass according to the coal and rock mass sample; Step S3, according to the parameters of the steeply inclined fully mechanized mining face and the physical and mechanical parameters of the coal and rock mass, the loss rate of the functional coal pillar is obtained; Step S4, preliminarily design the size and volume V0 of the functional coal pillar; Step S5: Obtain the remaining size and volume V of the functional coal pillar after one step of the working face through steeply inclined fully mechanized mining face production s ; Step S6: According to the remaining size V of the functional coal pillar s And the design volume V0, the design size of the functional coal pillar.
2. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 1, characterized in that: The physical and mechanical parameters of coal rock mass include: uniaxial compressive strength, tensile strength, cohesion, internal friction angle, and density physical and mechanical parameters of coal rock mass.
3. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 2, characterized in that: In step S3, based on the parameters of the steeply inclined fully mechanized mining face and the physical and mechanical parameters of the coal and rock mass, a functional coal pillar impact loss rate test is performed to obtain the functional coal pillar loss rate.
4. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 3, characterized in that: A corresponding steeply inclined working face simulation model is established, and the measured physical and mechanical parameters of the coal and rock mass are set. The functional dimensions of the emergency inclined working face before and after a shift step are monitored, the volume ratio of the functional coal pillar before and after a shift step is calculated, and the loss rate of the functional coal pillar is obtained.
5. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 4, characterized in that: If the remaining size of the functional coal pillar V s If the remaining volume V0 of the functional coal pillar is less than 1 / 4 of the designed volume V0, then the size of the functional coal pillar is reasonable and does not need to be adjusted. s If it is greater than 1 / 4 of the design volume V0, the design functional coal pillar size will be updated, and the updated functional coal pillar volume V1 is the initial design functional coal pillar volume V0 minus the measured functional coal pillar volume V s The volume of the part that is in excess of 1 / 4 of the design volume and the size of the updated functional coal pillar are adjusted proportionally.
6. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 5, characterized in that: The dimensions of the functional coal pillar include length, width and thickness; wherein the thickness is the coal mining thickness, the length is the dimension length along the working face advancement direction, and the width is the dimension length in the direction perpendicular to the working face.
7. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 6, characterized in that: The functional coal pillar is located at the lower end of the working face and at the junction of the transport tunnel and the working face.
8. The method for setting up functional coal pillars in a steeply inclined fully mechanized mining face according to claim 7, characterized in that: The way to set up functional coal pillars in actual production is: use a coal mining machine to cut coal to the lower end of the working face and stop without cutting through the lower end, leaving the width direction of the functional coal pillar on the coal wall side of the lower end of the working face; and control the length direction of the functional coal pillar by adjusting the pushing distance of the scraper conveyor at the lower end of the working face.