Maintenance method and maintenance material for trench pavement of open pit coal mine

Abstract

The invention provides a maintenance method and a maintenance material for a trench pavement of an open pit coal mine, and the maintenance method comprises the following steps: S1, digging out surface soil and soft bedrock of the trench pavement by using a loader, and enabling the digging depth to be greater than or equal to 0.5 m; s2, selecting hard large-block materials from the muck pile stripped from the working surface; and S3, a self-discharging truck is used for transporting the materials and dumping the materials to the downward digging area. And S4, the hard materials are flattened and tamped through a bucket of an excavator. And S5, collecting gobi materials, transporting the gobi materials by using a self-discharging truck, and dumping the gobi materials onto the compacted materials. And S6, the gobi materials are scraped to be flat through a land leveler, the gobi materials are compacted through a bucket of an excavator, and a layer of water mist is sprayed on the compacted gobi materials through a watering cart. According to the method provided by the invention, re-grooving of the road surface is avoided, the newly maintained road surface can be used for long-term driving of various engineering machinery, the repair times of the grooved road surface are reduced, the interference degree between road maintenance and coal rock transportation is reduced, and normal development of transportation operation is facilitated.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method and materials for repairing trench pavements in open-pit coal mines. Background Technology

[0002] Roads within open-pit coal mines are primarily temporary. As the stripping process progresses, most of these roads will be stripped away and eventually disappear. However, roads along the edges and boundaries are retained until the pit is backfilled, serving for extended periods as a means of transporting earth, rock, and coal, and undergoing numerous compaction cycles. When these long-term roads pass through weak rock masses, due to the insufficient strength and hardness of the bedrock, repeated heavy compaction causes the soil and rock in the compacted area to migrate to the uncompacted area, creating raised areas of soil and rock in the center and on both sides of the road. This forms two ruts on the road surface. As the ruts widen and deepen, the smooth road surface eventually evolves into a grouted road surface.

[0003] The relatively soft texture of ditch surfaces causes significant displacement when dump trucks travel on them. This vertical swaying severely slows down the trucks, unintentionally lengthening their transport cycle and significantly reducing their efficiency. The presence of ditches forces trucks to follow them, essentially defining their routes and dictating their path. This single-file approach reduces flexibility and autonomy, leading to more queues and congestion. Furthermore, driving along ditches presents safety hazards. When one tire is in the ditch while the other is not, the vehicle's center of gravity shifts, potentially causing rollovers. Unmanned driving, heavy loads, and slippery surfaces exacerbate these risks. Given the significant disadvantages of ditch surfaces, their improvement is necessary. Summary of the Invention

[0004] The embodiments of the present invention provide a method and materials for repairing trench pavements in open-pit coal mines, which are used to solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A method for repairing trench pavement in an open-pit coal mine includes the following steps: S1: Use a loader to excavate the loose soil and weak bedrock of the trench road surface to be repaired, and make the excavation depth greater than or equal to 0.5 m; S2: Select hard, large pieces of material from the explosive pile at the stripping face; S3: Pour hard, large pieces of material into the excavated area of ​​the trench surface to be repaired; S4: Flatten and compact large, hard materials in the excavation area; S5: Collect Gobi material and pour it onto a large, hard, compacted material. S6: Level the Gobi material, then compact the leveled Gobi material, and spray water mist onto the compacted Gobi material using a spraying device.

[0007] Preferably, the hard, large material has a uniaxial compressive strength greater than 10 MPa when not disturbed by the stripping process.

[0008] Preferably, the diameter of the hard, large material is 400-600 mm.

[0009] Preferably, the Gobi material includes three types of particulate matter: soil, sand, and gravel.

[0010] Preferably, the maximum particle size of the stones is 50 mm.

[0011] Preferably, in the Gobi material, the mass percentage of particles with a diameter of 0.01 mm or less is 38% to 52%, the mass percentage of particles with a diameter between 0.01 and 4.75 mm is 33% to 40%, and the mass percentage of particles with a diameter of 4.75 mm or more is 8% to 29%.

[0012] Secondly, the present invention provides a maintenance material for trench pavement in open-pit coal mines, comprising hard, large-sized material obtained from the blast pile of the stripping face, and Gobi material; the hard, large-sized material is used to be dumped into the excavated area of ​​the trench pavement to be repaired, and the Gobi material is used to cover the hard, large-sized material dumped into the excavated area of ​​the trench pavement to be repaired.

[0013] Preferably, the Gobi material includes three types of particulate matter: soil, sand, and gravel.

[0014] Preferably, in the Gobi material, the mass percentage of particles with a diameter of 0.01 mm or less is 38% to 52%, the mass percentage of particles with a diameter between 0.01 and 4.75 mm is 33% to 40%, and the mass percentage of particles with a diameter of 4.75 mm or more is 8% to 29%.

[0015] As can be seen from the technical solutions provided by the embodiments of the present invention above, the present invention provides a method and materials for repairing trench pavements in open-pit coal mines, including: using a loader to excavate the loose soil and weak bedrock of the trench pavement to be repaired, and making the excavation depth greater than or equal to 0.5 m; selecting hard, large pieces of material from the blast pile at the stripping face; transporting the hard, large pieces of material with a dump truck and dumping them into the excavated area of ​​the trench pavement to be repaired; leveling and compacting the hard material in the excavated area; collecting Gobi material, transporting the Gobi material with a dump truck, and dumping it onto the compacted material; leveling the Gobi material, then compacting the leveled Gobi material, and spraying water mist onto the compacted Gobi material with a spraying device. The method provided by the present invention avoids the re-ditching of the pavement, and the newly repaired pavement can be used for long-term travel by various engineering machinery, reducing the number of road repairs, reducing the degree of interference between road maintenance and coal and rock transportation, and facilitating the normal operation of transportation.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This invention provides a flowchart of a method for repairing trench surfaces in open-pit coal mines. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0021] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0022] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment provides a method for repairing trench pavement in an open-pit coal mine, the method including steps S1 to S6: S1: Use a loader to excavate the loose soil and weak bedrock of the trench road surface to be repaired, and make the excavation depth greater than or equal to 0.5 m; S2: Select hard, large pieces of material from the explosive pile at the stripping face; S3: Use dump trucks to transport hard, large materials and dump them into the excavated area of ​​the trench road surface to be repaired; S4: Spread and compact the hard, large pieces of material in the excavation area; S5: Collect Gobi materials, transport them using dump trucks, and dump them onto compacted, hard, large blocks of material; S6: Level the Gobi material, then compact the leveled Gobi material, and spray water mist onto the compacted Gobi material using a spraying device.

[0025] In a preferred embodiment of the present invention, the Gobi aggregate is composed of three types of particulate matter: soil, sand, and gravel. The maximum particle size of the gravel is 50 mm. In the Gobi aggregate, the mass percentage of particles with a diameter of 0.01 mm or less is 43%, the mass percentage of particles with a diameter between 0.01 and 4.75 mm is 36%, and the mass percentage of particles with a diameter of 4.75 mm or more is 21%. The technical problem to be solved by adopting this preferred gradation is that if the hard, large pieces of material on the upper surface are pulverized, it will lead to a loose soil layer on the road surface, which is still not conducive to mining transportation. This preferred gradation can more effectively prevent the pulverization of hard, large pieces of material.

[0026] In this embodiment, the hard, large-scale material refers to the blasted rock, which does not contain organic matter. The purpose of using this hard, large-scale material is to replace the weak bedrock at the bottom of the trench surface. Because the weak bedrock lacks sufficient strength and hardness, it will continue to be damaged even after repair without replacement; therefore, it needs to be replaced with hard, large-scale material. In step S4, leveling and compacting the hard material in the excavated area ensures that these hard, large-scale materials interlock. In step S5, the use of Gobi material prevents the hard, large-scale material from pulverizing and avoids the formation of a loose soil layer later.

[0027] In some feasible embodiments, in step S3, it is preferable to use a dump truck to transport the hard, large pieces of material to the excavated area of ​​the trench road surface to be repaired for dumping. Similarly, in step S5, a dump truck is also used to transport and dump the Gobi material. In step S4, the large, hard materials are spread and compacted using construction machinery such as an excavator with its bucket. In step S6, a grader is used to level the Gobi material on the upper surface of the excavated area, then the excavator bucket is used to compact it, and finally a water truck is used for spraying. The spraying operation is a low-pressure spraying method, which can prevent the compacted surface from being blown away.

[0028] Example 2

[0029] like Figure 1 As shown, this embodiment provides a method for repairing trench pavement in an open-pit coal mine, the method including steps S1 to S6: S1: Use a loader to excavate the loose soil and weak bedrock from the trench road surface, with a digging depth of 0.5 m or more.

[0030] S2: Select hard, large pieces of material from the explosive pile at the stripping face.

[0031] In this embodiment, the uniaxial compressive strength of the hard bulk material without being disturbed by the stripping process is 14.7 MPa, and the diameter of the hard bulk material is 600 mm.

[0032] S3: Transport materials using dump trucks and dump them into the excavated area.

[0033] S4: Use the excavator bucket to flatten and compact the hard material.

[0034] S5: Collect Gobi materials, transport them using dump trucks, and dump them onto compacted materials.

[0035] In this embodiment, the Gobi material is composed of three types of particles: soil, sand, and gravel. The maximum particle size of the gravel is 50 mm. In the Gobi material, particles with a diameter of 0.01 mm or less account for 43% of the mass, particles with a diameter between 0.01 and 4.75 mm account for 36% of the mass, and particles with a diameter of 4.75 mm or more account for 21% of the mass.

[0036] S6: Use a grader to level the Gobi material, use an excavator bucket to compact the Gobi material, and use a water truck to spray a layer of water mist onto the compacted Gobi material.

[0037] Example 3

[0038] The present invention also provides an embodiment for exemplarily demonstrating the beneficial effects of the method provided by the present invention.

[0039] Before this plan was implemented, the trench depth of some end-side roads in the open-pit mine of Xinjiang Yihua Mining Co., Ltd. reached 500 mm or more after 10 days of operation. The road maintenance frequency was once every 10 days. After implementing this plan, the road surface of the maintenance section will not sink after 10 days of normal operation and will basically remain consistent with the initial state of maintenance.

[0040] Example 4

[0041] Secondly, the present invention provides a maintenance material for trench pavement in open-pit coal mines, comprising hard, large-sized material obtained from the blast pile of the stripping face, and Gobi material; the hard, large-sized material is used to be dumped into the excavated area of ​​the trench pavement to be repaired, and the Gobi material is used to cover the hard, large-sized material dumped into the excavated area of ​​the trench pavement to be repaired.

[0042] In some preferred embodiments, the Gobi material is composed of three types of particles: soil, sand, and gravel. In the above-mentioned Gobi material, the mass percentage of particles with a diameter of 0.01 mm or less is 38% to 52%, the mass percentage of particles with a diameter between 0.01 and 4.75 mm is 33% to 40%, and the mass percentage of particles with a diameter of 4.75 mm or more is 8% to 29%.

[0043] In summary, this invention provides a method and materials for repairing trench pavements in open-pit coal mines, comprising: using a loader to excavate loose soil and weak bedrock from the trench pavement to be repaired, ensuring an excavation depth of at least 0.5 m; selecting hard, large pieces of material from the blast pile at the stripping face; transporting the hard, large pieces of material using a dump truck and dumping them into the excavated area of ​​the trench pavement to be repaired; leveling and compacting the hard material in the excavated area; collecting Gobi material, transporting it using a dump truck, and dumping it onto the compacted material; leveling the Gobi material, then compacting the leveled Gobi material, and spraying water mist onto the compacted Gobi material using a spraying device. The method provided by this invention avoids the re-ditching of the pavement, allowing the newly repaired pavement to be used by various types of construction machinery for long-term operation, reducing the number of road repairs, minimizing interference between road maintenance and coal transportation, and facilitating the normal operation of transportation activities.

[0044] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0045] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for repairing trench pavement in an open-pit coal mine, characterized in that, Includes the following steps: S1: Use a loader to excavate the loose soil and weak bedrock of the trench road surface to be repaired, and make the excavation depth greater than or equal to 0.5 m; S2: Select hard, large pieces of material from the explosive pile at the stripping face; S3: Pour hard, large pieces of material into the excavated area of ​​the trench surface to be repaired; S4: Flatten and compact the large, hard materials in the excavation area; S5: Collect Gobi material and pour it onto a large, hard, compacted material. S6: Level the Gobi material, then compact the leveled Gobi material, and spray water mist onto the compacted Gobi material using a spraying device.

2. The method as described in claim 1, characterized in that, The hard, bulk material has a uniaxial compressive strength greater than 10 MPa when not disturbed by the stripping process.

3. The method as described in claim 1, characterized in that, The diameter of the hard, large material is 400-600 mm.

4. The method as described in claim 1, characterized in that, The Gobi material includes three types of particulate matter: soil, sand, and gravel.

5. The method as described in claim 4, characterized in that, The maximum particle size of the stones is 50 mm.

6. The method as described in claim 4, characterized in that, In the Gobi material, particles with a diameter of 0.01 mm or less account for 38% to 52% of the mass, particles with a diameter between 0.01 and 4.75 mm account for 33% to 40% of the mass, and particles with a diameter of 4.75 mm or more account for 8% to 29% of the mass.

7. A maintenance material for trench pavement in open-pit coal mines, characterized in that, This includes hard, bulky material obtained from the blast pile at the stripping face, as well as Gobi material; the hard, bulky material is used to dump into the excavated area of ​​the trench surface to be repaired, and the Gobi material is used to cover the hard, bulky material dumped into the excavated area of ​​the trench surface to be repaired.

8. The repair material according to claim 7, characterized in that, The Gobi material includes three types of particulate matter: soil, sand, and gravel.

9. The repair material according to claim 8, characterized in that, In the Gobi material, particles with a diameter of 0.01 mm or less account for 38% to 52% of the mass, particles with a diameter between 0.01 and 4.75 mm account for 33% to 40% of the mass, and particles with a diameter of 4.75 mm or more account for 8% to 29% of the mass.

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