An underground multi-level collaborative disposal system and method for gangue waste

Abstract

The present invention discloses a multi-level collaborative disposal system and method for gangue waste underground. When multiple levels are mined simultaneously, the gangue waste from the gangue hill is made into slurry on the ground, grouting boreholes are drilled on the ground, and the slurry is injected into the goaf behind the production working face of the first level through the grouting boreholes; a slurry preparation chamber and slurry transportation pipelines are established underground. The gangue generated during the production process of the first-level working face is transported to the underground slurry preparation chamber to be made into slurry and then returned to the working face. A drilling site is arranged in each of the two roadways ahead of the production working face, and the slurry is injected into the goaf behind the second-level simultaneous mining working face through the grouting boreholes in the drilling site. The same process is carried out for the remaining levels. This method is simple to operate, can simultaneously dispose of the gangue on the ground and the gangue waste generated during the production process, reduces the gangue hoisting cost, shortens the length of the grouting boreholes, simplifies the grouting filling process, and provides a reference for the collaborative disposal of ground and underground gangue.

Description

Technical Field

[0001] The present invention relates to a collaborative disposal method for surface gangue piles and gangue produced underground, and in particular to a multi-level collaborative disposal system and method for gangue waste underground. Background Art

[0002] Coal occupies a dominant position in China's energy structure and is an important part of China's energy strategic security. During the construction and production of coal mines, a large amount of solid waste gangue is produced, which is usually directly stacked on idle sites in the production area to form gangue piles. Gangue usually occupies land, pollutes air, water quality and soil, and at the same time there are potential safety hazards such as spontaneous combustion and explosion, and air pollution. Eliminating the associated damage factors of the traditional gangue treatment mode and developing a sustainable gangue treatment mode are urgently needed, especially in the environmentally fragile mining areas in the central and western regions, which is an important technical research direction for green coal mining.

[0003] Traditional grouting filling is to drill holes from the ground, lift the underground gangue to the ground for pulping, and then inject it into the goaf through the grouting holes. However, when the burial depth is large, this method will show some disadvantages, such as the relatively high cost of lifting gangue, the relatively long length of the grouting holes, and the relatively high process requirements. Therefore, this patent proposes a multi-level collaborative disposal method for gangue waste underground, which is mainly a design method for the collaborative disposal of surface gangue piles and underground gangue during the multi-level joint mining of coal mines. Summary of the Invention

[0004] Technical Problem: The purpose of the present invention is to provide a safe, reliable, practical multi-level collaborative disposal system and method for gangue waste generated during the multi-level mining of coal mines and gangue waste from the original surface gangue piles. This method can carry out multi-level continuous filling, dispose of surface and underground gangue waste at the same time, reduce the gangue lifting cost, and reduce the length of the grouting holes, which has great advantages compared with the traditional grouting filling.

[0005] Technical Solution: The first object of the present invention is to provide a multi-level collaborative disposal system for gangue waste underground, which system includes a ground system, an underground pulping system and an underground horizontal production system located underground. The underground horizontal production system includes a first-level production system, …, an i-level production system, where i is an integer and i≥2.

[0006] The ground system includes a ground pulping station and ground grouting holes.

[0007] The underground horizontal production system includes an underground horizontal production working face, an underground goaf, an underground drill site, and an underground grouting borehole. The underground horizontal production working face includes a first horizontal production working face, …, an i-th horizontal production working face. The underground goaf includes a first goaf corresponding to the underground horizontal production working face one by one, …, an i-th goaf. The underground drill site is arranged on the inner sides of the two roadways of the 1st to i-1th underground horizontal production working faces, and the underground grouting borehole is arranged in the underground drill site;

[0008] The underground slurry preparation system includes an underground slurry preparation chamber and an underground slurry transportation pipeline. The underground slurry preparation chamber is connected to each underground drill site and each underground horizontal production working face through the underground slurry transportation pipeline;

[0009] The ground grouting borehole is connected to the goaf of the first horizontal production system, and the underground grouting borehole of the (i-1)-th horizontal production system is connected to the i-th goaf.

[0010] In an embodiment of the present invention, the number N of underground drill sites and the number n of grouting boreholes in each underground drill site are determined according to the grouting diffusion radius, the length of the working face, and the advancing length:

[0011]

[0012] In the formula:

[0013] L1—the length of the underground horizontal production working face;

[0014] L2—the advancing length of the underground horizontal production working face;

[0015] R—the grouting diffusion radius;

[0016] n—the number of grouting boreholes in each underground drill site;

[0017] N—the number of underground drill sites.

[0018] Among them, the length L1 of the underground horizontal production working face and the advancing length L2 of the underground horizontal production working face are both designed and obtained according to the actual size of the working face and the grouting diffusion radius.

[0019] In an embodiment of the present invention, if the number N of underground drill sites and the number n of grouting boreholes in each underground drill site are not integers, the ceiling method is used to round up. For example, if the number n of grouting boreholes in each underground drill site calculated according to the above formula is actually a non-integer, that is, it satisfies: M < n < M + 1 (M is a positive integer), at this time, the number n of grouting boreholes in each underground drill site is rounded up by the ceiling method to n = M + 1.

[0020] In an embodiment of the present invention, the underground drill site is at least 50 m ahead of the underground horizontal production working face.

[0021] In one embodiment of the present invention, the underground pulp-making chamber is located at the connection of the gangue bin and the track roadway at the same elevation.

[0022] In one embodiment of the present invention, the underground pulp transportation pipeline starts from the pulp-making chamber and is laid to both roadways of the working face.

[0023] In one embodiment of the present invention, a single-stage pump or a multi-stage pump is arranged in the underground pulp-making chamber. The single-stage pump or the multi-stage pump is used to pump the underground slurry made in the pulp-making chamber to improve efficiency. Specifically, a single-stage pump or a multi-stage pump that can meet the pumping requirements can be set according to the requirements of the transportation distance and the grouting pressure during the slurry transportation process. Any selection can be made according to the common pumping design specifications in the art, and no specific limitation is made in the present invention.

[0024] In one embodiment of the present invention, there are at least two methods for the layout of the underground pulp-making chamber and the coal-gangue separation system:

[0025] Method 1: The underground pulp-making chamber and the coal-gangue separation system are arranged in each underground horizontal production system at the same time, that is, each of the first horizontal production system,..., the i-th horizontal production system arranges an underground pulp-making chamber and a coal-gangue separation system. After the ground gangue is pulped, it is injected into the first horizontal production system. The coal and gangue generated by the (i - 1)-th horizontal production working face are sorted by the coal-gangue separation system of the (i - 1)-th horizontal production system and the underground pulp-making chamber in sequence, and then made into slurry and injected into the (i - 1)-th goaf behind the (i - 1)-th horizontal production working face and the i-th goaf behind the i-th horizontal production working face respectively. The gangue generated by the i-th horizontal production working face is sorted by the coal-gangue separation system of the i-th horizontal production system and the underground pulp-making chamber in sequence, and then made into slurry and injected into this level (that is, the i-th goaf behind the i-th horizontal production working face).

[0026] Method 2: The underground pulp-making chamber is arranged in each underground horizontal production system respectively, and the coal-gangue separation system is arranged in the i-th horizontal production system. After the ground gangue is pulped, it is injected into the first horizontal production system. The coal and gangue generated by the (i - 1)-th horizontal production working face are sorted by the coal-gangue separation system and then pulped in the underground pulp-making chamber of the (i - 1)-th horizontal production system and then injected into the i-th horizontal production system. The coal and gangue of the i-th horizontal production working face are sorted by the coal-gangue separation system and then pulped in the underground pulp-making chamber of the i-th horizontal production system and injected into the i-th horizontal production system.

[0027] In the present invention, there is no specific limitation on the distance between the underground pulp-making chamber, the gangue bunker, and the horizontal working face. It is only necessary to arrange them in sequence as the gangue bunker - underground pulp-making chamber - working face. Generally, the gangue bunker is arranged near the underground pulp-making chamber, and the underground pulp-making chamber is arranged near the main transportation roadway of the underground horizontal production system. If the distance between the underground pulp-making chamber and the working face is relatively far, pumping with a larger pumping capacity or multi-stage pumping can be considered.

[0028] The second object of the present invention is to provide a working method for a multi-level collaborative disposal system for gangue waste underground, including the following steps:

[0029] (1) The gangue waste from the gangue hill is made into ground slurry at the ground pulp-making station and injected into the first goaf behind the first horizontal production working face through the ground grouting borehole.

[0030] (2) The gangue waste generated by the (i - 1)-th horizontal production working face is transported to the underground pulp-making chamber through the underground slurry pipeline and made into underground slurry.

[0031] (3) The underground slurry is transported to the underground drill field of the (i - 1)-th horizontal production working face through the underground slurry pipeline and injected into the i-th goaf behind the i-th horizontal production working face through the underground grouting borehole in this underground drill field.

[0032] In an embodiment of the present invention, the distance between the slurry injection into the goaf and the working face is at least 15 m to ensure that the slurry will not flow into the face.

[0033] In an embodiment of the present invention, a multi-level collaborative disposal method for gangue waste underground is proposed, and the specific steps are as follows:

[0034] (1) When multiple underground levels are producing simultaneously, the gangue waste from the gangue hill is made into ground slurry at the ground pulp-making station and injected into the first goaf behind the first horizontal production working face underground by drilling a ground grouting borehole on the ground, and ensure that the slurry will not flow into the first horizontal production working face.

[0035] (2) The gangue waste generated by the first horizontal production working face is transported to the underground pulp-making chamber through establishing an underground pulp-making chamber and an underground slurry pipeline underground and made into underground slurry.

[0036] (3) One underground drill field is arranged in each of the two roadways ahead of the first horizontal production working face, several underground grouting boreholes are arranged in the underground drill field, the grouting diffusion radius R of the underground grouting borehole is determined, and the made underground slurry is injected into the second goaf behind the second horizontal production working face through the underground grouting borehole, and ensure that the slurry will not flow into the second horizontal production working face.

[0037] (4) The remaining underground horizontal production working faces can be carried out in sequence.

[0038] In one embodiment of the present invention, in order not to affect production, 1-5 drill sites can be arranged in advance according to the engineering situation.

[0039] Beneficial effects: The underground multi-level collaborative disposal system and method for gangue waste of the present invention can carry out multi-level continuous filling, and dispose of surface and underground gangue waste at the same time, reducing the gangue lifting cost and the length of grouting boreholes. It provides a new idea and method for disposing of gangue waste generated during the multi-level mining of coal mines and gangue waste from the original surface gangue piles. This design method has strong practicability, simple operation and obvious beneficial effects, and can provide theoretical and engineering reference for coal resource mining and gangue disposal in coal mines, enriching the theory of green mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 is the design flow chart of the present invention;

[0042] Figure 2 is the schematic diagram of the method for underground multi-level collaborative disposal of gangue waste of the present invention;

[0043] Figure 3 is the drill site layout diagram;

[0044] Figure 4 is the grouting pipeline layout diagram.

[0045] In the figure: 1 - surface pulp making station; 2 - surface grouting borehole; 3 - first-level production working face; 4 - second-level production working face; 5 - first-level goaf; 6 - second-level goaf; 7 - drill site; 8 - underground grouting borehole; 9 - underground pulp making chamber; 10 - coal gangue separation system; 11 - gangue bunker; 12 - track upcast; 13 - grouting pipeline laying route; 14 - two roadways of the working face; 15 - haulage upcast. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The following will further illustrate the present invention in conjunction with the drawings and embodiments. According to the following embodiments, the present invention can be better understood. However, those skilled in the art can easily understand that the specific process conditions and their results described in the embodiments are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0047] The present invention discloses a multi-level collaborative disposal system and method for gangue waste underground, which is applicable to simultaneous multi-level mining. This method is simple to operate and can simultaneously dispose of surface gangue mountains and gangue waste generated during the production process, reducing the gangue hoisting cost, shortening the grouting borehole length, and simplifying the grouting filling process, providing a reference for the collaborative disposal of surface and underground gangue.

[0048] Embodiment

[0049] The designed production capacity of a certain coal mine is 1.2 Mt / a. The main coal seam mined is the 2# coal seam, and the 1# coal seam is mined simultaneously with two coal seams. The burial depth of the 1# coal seam is about 150 m, and the burial depth of the 2# coal seam is about 250 m. The coal seam thicknesses are 2.5 m and 3 m respectively, and the annual gangue output is 0.17 Mt. The length of the second-level working face is 180 m, and the advancing length is 1500 m.

[0050] Due to the large amount of gangue production and the inability to handle it, a large amount of gangue accumulates on the ground. At the same time, a large amount of gangue is continuously produced underground and transported to the ground. Therefore, filling is required to achieve the purpose of treating surface gangue waste and gangue waste generated underground.

[0051] Combined with a multi-level collaborative disposal system and method for gangue waste underground of the present invention, the specific steps of this embodiment are described in combination with the design flow chart as shown in Figure 1 as follows:

[0052] 1. As shown in Figure 2 , Figure 3 , the system includes a ground system, an underground slurry preparation system and an underground multi-level production system located underground. The underground multi-level production system includes a first-level production system and a second-level production system. The ground system includes a ground slurry preparation station 1 and a ground grouting borehole 2; the ground grouting borehole 2 is connected to the first-level goaf 5 of the first-level production system.

[0053] The underground multi-level production system includes a first-level production working face 3 and a second-level production working face 4. The underground goafs include a first-level goaf 5 and a second-level goaf 6 corresponding to the underground multi-level production working faces one by one, as well as an underground drill site 7 and an underground grouting borehole 8. Underground drill sites 7 are arranged on the inner sides of the two roadway sides 14 of the first-level production working face 3 and the second underground multi-level production working face 4. The underground drill site 7 is 50 m ahead of the underground multi-level production working face. The underground grouting borehole 8 is arranged in the underground drill site 7;

[0054] As shown in Figure 4As shown in the figure, the underground slurry preparation system includes an underground slurry preparation chamber 9 and underground slurry transportation pipelines. The underground slurry transportation pipelines start from the underground slurry preparation chamber 9. A single-stage pump is installed in the underground slurry preparation chamber 9. The underground slurry preparation chamber 9 is connected to each underground drill site 7 and each underground horizontal production working face through the underground slurry transportation pipelines; the underground coal gangue generated at the horizontal working face is transported to the coal gangue separation system 10 through the belt conveyor in the transportation uphill roadway 15 and then separated into the gangue bin 11. The underground slurry preparation chamber 9 is located at the connection position between the gangue bin 11 and the track uphill roadway 12 at the same elevation. The laying route 13 of its grouting pipeline is: slurry preparation chamber 9 - track uphill roadway 12 - two roadways of the working face 14.

[0055] There are two methods for the horizontal layout of the underground slurry preparation chamber 9 and the coal gangue separation system 10:

[0056] Method 1: The underground slurry preparation chamber 9 and the small coal gangue separation system 10 are arranged at the two levels simultaneously. That is, an underground slurry preparation chamber 9 and a coal gangue separation system 10 are arranged in the first-level production system, and an underground slurry preparation chamber 9 and a coal gangue separation system 10 are also arranged in the second-level production system. The ground gangue is slurried and then injected into the first-level production system. The coal gangue at the first level is separated by the coal gangue separation system 10 in the first-level production system and then made into slurry in the underground slurry preparation chamber 9 of the first-level production system and injected into the first-level production system and the first-level production system respectively. The gangue generated by the second-level production system is separated by the coal gangue separation system 10 in the second-level production system and then made into slurry in the underground slurry preparation chamber 9 of the second-level production system and injected into this level.

[0057] Method 2: The underground slurry preparation chamber 9 is arranged in the first and second-level production systems respectively, and the coal gangue separation system 10 is arranged in the second-level production system. The ground gangue is slurried and then injected into the first-level production system. The gangue generated during the tunneling process at the first level is separated by the coal gangue separation system 10 and then slurried in the underground slurry preparation chamber 9 of the first-level production system and injected into the second-level production system. The coal gangue of the second-level production system is separated by the coal gangue separation system 10 and then slurried in the underground slurry preparation chamber 9 of the second-level production system and injected into the second-level production system.

[0058] 2. Determine the number N of underground drill sites and the number n of grouting holes in each underground drill site according to the grouting diffusion radius, the length of the working face, and the advancing length:

[0059]

[0060] In the formula:

[0061] L1—the length of the underground horizontal production working face;

[0062] L2—the advancing length of the underground horizontal production working face;

[0063] R—the grouting diffusion radius;

[0064] n—the number of grouting boreholes in each underground drilling site;

[0065] N—the number of underground drilling sites.

[0066] It is obtained that n = 6, N = 100, and the interval between the slurry injection into the goaf and the working face is 15 m.

[0067] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-level collaborative disposal system for gangue waste underground, characterized in that, The system includes a ground system, an underground slurry preparation system and an underground horizontal production system. The underground horizontal production system includes a first horizontal production system, …, an i-th horizontal production system, where i is an integer and i ≥ 2. The ground system includes a ground slurry preparation station and a ground grouting borehole. The underground horizontal production system includes an underground horizontal production working face, an underground goaf, an underground drill site and an underground grouting borehole. The underground horizontal production working face includes a first horizontal production working face, …, an i-th horizontal production working face. The underground goaf includes a first goaf corresponding to the underground horizontal production working face one by one, …, an i-th goaf. The inner sides of the two roadways of the 1st to i-1 underground horizontal production working faces are both provided with the underground drill sites, and the underground grouting boreholes are arranged in the underground drill sites. The underground slurry preparation system includes an underground slurry preparation chamber and an underground slurry conveying pipeline. The underground slurry conveying pipeline starts from the underground slurry preparation chamber. A single-stage pump is arranged in the underground slurry preparation chamber. The underground slurry preparation chamber is connected to each underground drill site and each underground horizontal production working face through the underground slurry conveying pipeline. The coal gangue of the underground horizontal production working face is transported to a coal gangue separation system by a belt, then separated into a gangue bin, and then transported to the underground slurry preparation chamber by a belt to make slurry. The underground slurry preparation chamber is located at the connection position between the gangue bin and the track upcast roadway at the same elevation, and its grouting pipeline laying route is the slurry preparation chamber - the track upcast roadway - the two roadways of the working face. The ground grouting borehole is connected to the goaf of the first horizontal production system, and the underground grouting borehole of the (i - 1)-th horizontal production system is connected to the i-th goaf. Determine the number N of underground drill sites and the number n of grouting boreholes in each underground drill site according to the grouting diffusion radius, the length of the working face and the advancing length: Wherein: L1—the length of the underground horizontal production working face; L2—the advancing length of the underground horizontal production working face; R—the grouting diffusion radius; n—the number of grouting boreholes in each underground drill site; N—the number of underground drill sites.

2. The system according to claim 1, wherein If the number N of underground drill sites and the number n of grouting boreholes in each underground drill site are not integers, the ceiling method is used to round up.

3. The system according to claim 1, characterized in that The underground drill site is at least 50 m ahead of the underground horizontal production working face.

4. The system according to claim 1, wherein A multi-stage pump is arranged in the underground slurry preparation chamber.

5. The system according to claim 1, wherein The layout methods of the underground slurry preparation chamber and the coal gangue separation system at least include the following two methods: arranging the underground slurry preparation chamber and the coal gangue separation system in each underground horizontal production system at the same time, or arranging the underground slurry preparation chamber in each underground horizontal production system respectively, and arranging the coal gangue separation system in the i-th horizontal production system.

6. The working method of a multi-level collaborative disposal system for gangue waste underground according to any one of claims 1-5, characterized in that, Including the following steps: (1) The gangue waste on the gangue mountain is made into ground slurry at the ground slurry preparation station and injected into the first goaf behind the first horizontal production working face through the ground grouting borehole. (2) The gangue waste generated by the (i - 1)-th horizontal production working face is transported to the underground slurry preparation chamber by a belt to make underground slurry. (3) The underground slurry is transported to the underground drill site of the (i - 1)-th horizontal production working face through the underground slurry conveying pipeline and injected into the goaf behind the i-th horizontal production working face through the underground grouting borehole in the underground drill site.

7. The method according to claim 6, characterized in that, The distance between the slurry injection into the gob area and the working face is at least 15 m apart.

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