A coal mine roadway floor heave treatment method

Abstract

This application discloses a method for treating floor heave in coal mine roadways, which can effectively solve the problem. The method includes: drilling a hole downwards into the mine roadway floor using a drilling rig with a twist drill rod; installing a borehole pipe with a type 7 guide pipe at the borehole opening, extending a predetermined distance into the borehole; replacing the twist drill rod with a stirring drill rod, the drill bit at the end of the stirring drill rod being a crushing drill bit; connecting a slag discharge slurry pump and a high-pressure gas pipeline through a three-way valve, introducing slag discharge slurry into the borehole through the outlet of the three-way valve, and connecting the type 7 guide pipe to a sedimentation tank; turning on the slag discharge slurry pump, adjusting the gas-liquid ratio through the three-way valve to form bubbles in the borehole; starting the drilling rig for deep drilling, causing the drill bit to crush the surrounding rock at the bottom, discharging the debris into the annular space between the stirring drill rod and the surrounding rock wall of the borehole, and carrying the rock and coal debris to the borehole pipe through the slag discharge slurry, from where it flows into the sedimentation tank through the type 7 guide pipe. This invention is applicable to the treatment of floor heave in coal mine roadways.

Description

Technical Field

[0001] This application relates to the field of coal mine roadway floor heave treatment technology, specifically to a method for treating coal mine roadway floor heave. Background Technology

[0002] In coal mining, floor heave occurs to varying degrees in almost all mining roadways. Especially in recent years, as coal mining has progressed to deeper levels, the resulting increase in ground stress has exacerbated the problem, making floor heave a more prominent and serious issue that exposes many problems affecting coal mine safety. Floor heave is a common dynamic phenomenon in coal mine roadways, directly related to the properties of the surrounding rock, mine pressure, mining depth, and geological structure. While roof subsidence and sidewall movement can be controlled to a certain extent, approximately two-thirds of roof and sidewall slippage is caused by floor heave. Floor heave deforms the roadway, reduces its cross-sectional area, affects ventilation and transportation, and restricts safe mine production. These problems pose significant challenges to the construction and normal operation of deep mines, especially soft rock mines.

[0003] Therefore, studying the mechanism and prevention measures of floor heave in coal mine roadways has significant theoretical and practical value for building high-yield and efficient mines and improving personnel safety in my country. Summary of the Invention

[0004] To address the difficulty in treating floor heave in existing coal mine roadways, this application provides a method for treating floor heave in coal mine roadways. This method involves drilling holes in the floor slab of the coal mine roadway to reduce the stress on the surrounding rock and thus treat the floor heave.

[0005] This invention provides a method for treating floor heave in coal mine roadways, comprising:

[0006] A drilling rig is used to drill holes downwards into the floor of the mine roadway using a twist drill rod;

[0007] An orifice pipe is installed at the opening of the borehole. The orifice pipe has a type 7 guide pipe and extends into the borehole a predetermined distance.

[0008] Replace the twist drill rod with a mixing drill rod, and the drill bit at the end of the mixing drill rod is a crushing drill bit;

[0009] The slag discharge slurry pump and high-pressure gas pipeline are connected by a three-way valve. The slag discharge slurry is introduced into the borehole through the outlet of the three-way valve, and the type 7 guide pipe is connected to the sedimentation tank.

[0010] Turn on the slag discharge slurry pump and adjust the gas-liquid ratio through the three-way valve to form intermittent bubbles in the borehole;

[0011] The drilling rig is started to drill deep holes so that the drill bit breaks the surrounding rock at the bottom of the borehole and discharges the slag into the annular space between the mixing drill rod and the surrounding rock wall of the borehole. The rock and coal slag is carried to the borehole opening pipe by the slag discharge slurry and flows into the sedimentation tank through the type 7 guide pipe.

[0012] In one specific implementation, the drilling rig is activated to perform deep drilling, so that the drill bit breaks the surrounding rock at the bottom of the borehole, and the debris is discharged into the annular space between the mixing drill rod and the surrounding rock wall of the borehole. The rock and coal slag is carried to the borehole opening pipe by the slag discharge slurry and flows into the sedimentation tank through the type 7 guide pipe, including:

[0013] Start the drilling rig and break the surrounding rock at the bottom of the borehole using the breaking discs on the drill bit;

[0014] The cuttings are discharged into the annular space between the mixing drill rod and the surrounding rock wall by the mixing discs on the mixing drill rod.

[0015] The slag discharge slurry enters the bottom of the borehole through the channel inside the drill rod. Under the stirring action of the stirring discs of the stirring drill rod and the action of the bubbles generated by the high-pressure gas in the slag discharge slurry, an upward turbulent flow is formed. Through this turbulent flow and the action of the slag discharge slurry, the rock and coal slag is carried to the borehole opening and flows into the sedimentation tank through the type 7 guide pipe.

[0016] In one specific implementation, starting the drilling rig and breaking the surrounding rock at the bottom of the borehole using the breaking discs on the drill bit includes:

[0017] Start the drilling rig and control the distance between the breaking discs on the drill bit and at least one inner wall of the borehole to be 1-5 mm. The breaking discs on the drill bit will break the surrounding rock at the bottom of the borehole.

[0018] In one specific implementation, the axial positional deviation between two adjacent fragments along the axial direction of the drill bit is 0.5 mm to 10 mm.

[0019] In one specific implementation, the formation of upward turbulence under the stirring action of the stirring discs of the stirring drill rod and the action of bubbles generated by high-pressure gas in the slag discharge slurry includes:

[0020] The first stirring plate on the side wall of the stirring drill rod generates an upward stirring force, and the second stirring plate generates a downward stirring force, forming a spiral-shaped upward turbulent flow; wherein, the first stirring plate and the second stirring plate are inclined upward as a whole.

[0021] In one specific implementation, the upward tilt angle of the first and second stirring plates is less than or equal to 30 degrees.

[0022] In one specific implementation, the drilling rig uses a twist drill rod to drill a hole to a depth of 2-3m and a diameter of 28-200mm into the bottom plate of the mine roadway.

[0023] In one specific implementation, the orifice extends into the borehole by at least 500 mm.

[0024] In one specific implementation, the density of the slag discharge slurry is greater than that of water.

[0025] In one specific implementation, the slag discharge slurry carries the rock and coal slag to the borehole opening and flows into the sedimentation tank through the type 7 guide pipe. After sedimentation and filtration in the sedimentation tank, the slag discharge slurry is continuously injected into the borehole through the slag discharge slurry pump for recycling.

[0026] The coal mine roadway floor heave treatment method provided by the embodiments of the present invention involves drilling a hole downwards into the roadway floor using a drilling rig with a twist drill rod; installing an orifice pipe at the hole opening, the orifice pipe having a 7-type guide pipe extending a predetermined distance into the borehole to prevent slag discharge slurry from overflowing onto the roadway floor surface; replacing the twist drill rod with a mixing drill rod, the drill bit at the end of the mixing drill rod being a crushing drill bit, making the crushing of the bottom surrounding rock more efficient; connecting a slag discharge slurry pump and a high-pressure gas pipeline through a three-way valve, introducing slag discharge slurry into the borehole through the outlet of the three-way valve, and then... The type-7 guide pipe connects to the sedimentation tank, which can form a circulation loop for the slag discharge slurry. The slag discharge slurry pump is turned on, and the gas-liquid ratio is adjusted through the three-way valve to form intermittent bubbles in the borehole, thereby generating rising bubbles to form turbulence. The drilling rig is started to drill deep holes so that the drill bit breaks the surrounding rock at the bottom of the borehole and discharges the debris into the annular space between the stirring drill rod and the surrounding rock wall of the borehole. The slag discharge slurry carries the rock and coal slag to the borehole opening pipe and flows into the sedimentation tank through the type-7 guide pipe. This can effectively discharge the rock and coal slag from the hole, thereby reducing the stress on the surrounding rock of the roadway floor and effectively treating the floor heave of the coal mine roadway. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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.

[0028] Figure 1 This is a flowchart illustrating a method for treating floor heave in coal mine roadways according to an embodiment of this application.

[0029] Figure 2This is a schematic diagram of the slag removal equipment in the coal mine roadway floor heave treatment method according to an embodiment of this application;

[0030] Figure 3 This is a schematic diagram showing the circumferential installation position of the stirring discs in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram showing the axial installation positions of the stirring and breaking discs in an embodiment of this application.

[0032] Explanation of key figure labels:

[0033] 10-Drilling rig; 11-Drill rod; 12-Drill bit; 13-Three-way valve; 14-Slag discharge slurry pump; 15-Sedimentation tank; 16-Orifice pipe; 17-Guide pipe; 20-Agitator disc; 30-Break disc. Detailed Implementation

[0034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a method for treating floor heave in coal mine roadways, the method including:

[0037] S11. Drilling rig 10 is used to drill holes downwards in the bottom plate of the mine roadway using a twist drill rod.

[0038] S12. Install an orifice pipe 16 at the opening of the borehole. The orifice pipe 16 has a type 7 guide pipe 17 and extends into the borehole a predetermined distance.

[0039] S13. Replace the twist drill rod with a stirring drill rod 11, wherein the drill bit 12 at the end of the stirring drill rod 11 is a crushing drill bit.

[0040] S14. The slag discharge slurry pump 14 and the high-pressure gas pipeline are connected through the three-way valve 13. The slag discharge slurry is introduced into the borehole through the outlet of the three-way valve 13, and the type 7 guide pipe 17 is connected to the sedimentation tank.

[0041] S15. Turn on the slag discharge slurry pump 14 and adjust the gas-liquid ratio through the three-way valve 13 to form intermittent bubbles in the borehole.

[0042] S16. Start the drilling machine 10 to drill deep holes so that the drill bit 12 breaks the surrounding rock at the bottom of the hole and discharges the slag into the annular space between the mixing drill rod 11 and the surrounding rock wall of the hole. The rock and coal slag is carried to the orifice pipe 16 by the slag discharge slurry and flows into the sedimentation tank 15 from the type 7 guide pipe 17.

[0043] In this embodiment, it can be achieved through, as follows: Figure 2 The equipment shown employs a drilling rig 10 to drill a hole downwards into the mine roadway floor using a twist drill rod. A borehole pipe 16 is installed at the borehole opening, the pipe having a type 7 guide pipe 17 extending a predetermined distance into the borehole to prevent slag discharge slurry from overflowing onto the roadway floor surface. The twist drill rod is replaced with a mixing drill rod 11, the drill bit 12 at the end of which is a crushing drill bit, resulting in more efficient crushing of the surrounding rock at the bottom. A slag discharge slurry pump 14 and a high-pressure gas pipeline are connected via a three-way valve 13. Slag discharge slurry is introduced into the borehole through the outlet of the three-way valve 13, and the type 7 guide pipe 17 is connected to the borehole. Connecting to the sedimentation tank allows for the construction of a circulation loop for the slag discharge slurry. The slag discharge slurry pump 14 is turned on, and the gas-liquid ratio is adjusted via the three-way valve 13, creating intermittent bubbles within the borehole. This generates rising bubbles to form turbulence. The drilling rig 10 is then started to drill deep holes, causing the drill bit 12 to break the surrounding rock at the bottom of the borehole. The debris is discharged into the annular space between the stirring drill rod 11 and the surrounding rock wall of the borehole. The slag discharge slurry carries the coal and rock debris to the borehole opening pipe 16, and it flows into the sedimentation tank 15 through the type 7 guide pipe 17. This effectively removes the coal and rock debris from the borehole, reducing the stress on the surrounding rock of the roadway floor and effectively addressing the heave of the coal mine roadway floor.

[0044] Optionally, in one embodiment of the present invention, the drilling rig 10 is activated to perform deep drilling, so that the drill bit 12 breaks the surrounding rock at the bottom of the borehole and discharges the debris into the annular space between the stirring drill rod 11 and the surrounding rock wall of the borehole. The rock and coal slag is carried to the borehole opening pipe 16 by the slag discharge slurry and flows into the sedimentation tank 15 through the type 7 guide pipe 17, including:

[0045] The drilling rig 10 is started, and the breaking discs 30 on the drill bit 12 break the surrounding rock at the bottom of the borehole; the breaking discs 30 can, as Figure 4 The structure shown;

[0046] The cuttings are discharged into the annular space between the mixing drill rod 11 and the surrounding rock wall by the mixing discs 20 on the mixing drill rod 11; the mixing discs 20 can, as Figure 3 , Figure 4 The structure shown;

[0047] The slag discharge slurry enters the bottom of the borehole through the channel inside the drill rod 11. Under the stirring action of the stirring disc 20 of the stirring drill rod 11 and the action of the bubbles generated by the high-pressure gas in the slag discharge slurry, an upward turbulent flow is formed. Through this turbulent flow and the action of the slag discharge slurry, the rock and coal slag is carried to the borehole pipe 16 and flows into the sedimentation tank 15 from the type 7 guide pipe 17.

[0048] After the drilling rig 10 is started, the crushing discs 30 of the alloy drill bit 12 crush the surrounding rock at the bottom of the borehole and discharge the debris into the annular space between the mixing drill rod 11 and the surrounding rock wall of the borehole. During this process, the slag discharge slurry enters the bottom of the borehole through the channel inside the drill rod 11 and exerts upward pressure on the debris, thus forming a discharge channel. Under the stirring action of the mixing discs 20 of the mixing drill rod 11, the mixing discs 20 form a spiral upward turbulent flow in the borehole wall and the annular space of the borehole. At the same time, the slag discharge slurry contains high-pressure gas, and the rising bubbles generated can also form good turbulence, with excellent fluidity, encapsulation and suspension properties, preventing the sedimentation of rock and coal slag and improving the slag discharge efficiency of the slag discharge slurry.

[0049] Optionally, in one embodiment of the present invention, the activation of the drilling rig 10, which uses the breaking discs 30 on the drill bit 12 to break the surrounding rock at the bottom of the borehole, includes:

[0050] Start the drilling rig 10 and control the distance between the breaking disc 30 on the drill bit 12 and at least one inner wall of the borehole to be 1-5 mm. The breaking disc 30 on the drill bit 12 breaks the surrounding rock at the bottom of the borehole.

[0051] When the distance between the breaking disc 30 and the borehole wall is 1-5 mm, an effective radial action space can be formed for the slag. This not only facilitates further crushing of larger coal and rock fragments, but also helps the drill rod 11 to maintain continuous operation, avoiding stagnation or jamming, and also helps to form a smooth discharge channel for the slag discharge slurry. Preferably, the breaking disc 30 is mainly arranged on the first drill rod connected to the drill bit 12, and there is no less than one set.

[0052] Optionally, in one embodiment of the present invention, the axial positional deviation between two adjacent fragmentation pieces 30 along the axial direction of the drill bit 12 is 0.5 mm to 10 mm.

[0053] By designing the axial position deviation between two adjacent breaking segments 30 to be 0.5mm to 10mm, an effective axial action space can be further formed, which can improve the probability of crushing contact and crushing effect of coal and rock fragments at the position of the breaking segment 30, and increase the disturbance and crushing capacity of coal and rock fragments.

[0054] Optionally, in one embodiment of the present invention, the formation of rising turbulence under the stirring action of the stirring discs 20 of the stirring drill rod 11 and the action of bubbles generated by high-pressure gas in the slag discharge slurry includes:

[0055] The first stirring plate on the side wall of the stirring drill rod 11 generates an upward stirring force, and the second stirring plate generates a downward stirring force, forming a spiral upward turbulent flow; wherein, the first stirring plate and the second stirring plate are inclined upward as a whole.

[0056] By further constructing the first stirring blade to generate an upward stirring force and the second stirring blade to generate a downward stirring force, the disturbance capability of the local area is improved, and a spiral upward turbulent flow is formed in the side wall of the stirring drill rod 11 and the annular space of the borehole. This makes the rock and coal slag more fluid and suspended under the action of the first and second stirring blades, thereby improving the discharge efficiency of the rock and coal slag.

[0057] Preferably, in one embodiment of the present invention, the upward tilt angle of the first stirring plate and the second stirring plate is less than or equal to 30 degrees.

[0058] Optionally, in one embodiment of the present invention, the drilling rig 10 drills a hole to a depth of 2-3m and a diameter of 28-200mm into the mine roadway floor using a twist drill rod. The borehole pipe 16 extends into the borehole to a depth of at least 500mm to further prevent slag discharge slurry from overflowing onto the roadway floor surface.

[0059] Optionally, in one embodiment of the present invention, the density of the slag discharge slurry is greater than the density of water.

[0060] The density of the slag discharge slurry is greater than that of water, such as special cement slurry and special yellow mud slurry. It has good fluidity, encapsulation and suspension properties. The additives are surfactants, water-reducing agents, etc. It can carry the rock coal slag to the orifice pipe 16 and flow into the sedimentation tank 15 from the type 7 guide pipe 17.

[0061] Optionally, in one embodiment of the present invention, the slag discharge slurry carries the rock and coal slag to the borehole pipe 16, and after flowing into the sedimentation tank 15 from the type 7 guide pipe 17, after sedimentation and filtration in the sedimentation tank 15, the slag discharge slurry is continued to be injected into the borehole through the slag discharge slurry pump 14 for recycling.

[0062] After the slag is settled and filtered, the discharged slag slurry is continued to be injected into the borehole of the drilling rig 10 through the slag discharge slurry pump 14 for recycling. This complete cycle operation procedure can be constructed on the construction site, which can further reduce construction costs and improve the practicality and economy of this method.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0065] In particular, the device embodiment is basically similar to the method embodiment, so the description is relatively simple. For relevant details, please refer to the description of the method embodiment.

[0066] The above description is merely a specific 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 treating floor heave in coal mine roadways, characterized in that, include: A drilling rig is used to drill holes downwards into the floor of the mine roadway using a twist drill rod; An orifice pipe is installed at the opening of the borehole. The orifice pipe has a type 7 guide pipe and extends into the borehole a predetermined distance. Replace the twist drill rod with a mixing drill rod, and the drill bit at the end of the mixing drill rod is a crushing drill bit; The slag discharge slurry pump and high-pressure gas pipeline are connected by a three-way valve. The slag discharge slurry is introduced into the borehole through the outlet of the three-way valve, and the type 7 guide pipe is connected to the sedimentation tank. Turn on the slag discharge slurry pump and adjust the gas-liquid ratio through the three-way valve to form intermittent bubbles in the borehole; The drilling rig is started to drill deep holes so that the drill bit breaks the surrounding rock at the bottom of the hole and discharges the debris into the annular space between the mixing drill rod and the surrounding rock wall of the hole. The rock and coal slag is carried to the hole opening pipe by the slag discharge slurry and flows into the sedimentation tank from the type 7 guide pipe. The drilling rig is activated to perform deep drilling, so that the drill bit breaks the surrounding rock at the bottom of the borehole and discharges the debris into the annular space between the mixing drill rod and the surrounding rock wall. The rock and coal slag is carried to the borehole opening pipe by the slag discharge slurry and flows into the sedimentation tank through the type 7 guide pipe, including: Start the drilling rig and break the surrounding rock at the bottom of the borehole using the breaking discs on the drill bit; The cuttings are discharged into the annular space between the mixing drill rod and the surrounding rock wall by the mixing discs on the mixing drill rod. The slag discharge slurry enters the bottom of the borehole through the channel inside the drill rod. Under the stirring action of the stirring discs of the stirring drill rod and the action of the bubbles generated by the high-pressure gas in the slag discharge slurry, an upward turbulent flow is formed. Through this turbulent flow and the action of the slag discharge slurry, the rock and coal slag is carried to the borehole opening and flows into the sedimentation tank through the type 7 guide pipe.

2. The method for treating floor heave in coal mine roadways according to claim 1, characterized in that, The drilling rig is started, and the surrounding rock at the bottom of the borehole is broken by the breaking discs on the drill bit, including: Start the drilling rig and control the distance between the breaking discs on the drill bit and at least one inner wall of the borehole to be 1-5 mm. The breaking discs on the drill bit will break the surrounding rock at the bottom of the borehole.

3. The method for treating floor heave in coal mine roadways according to claim 2, characterized in that, The axial positional deviation between two adjacent fragments along the axis of the drill bit is 0.5mm to 10mm.

4. The method for treating floor heave in coal mine roadways according to claim 1, characterized in that, The upward turbulence formed under the stirring action of the stirring discs of the stirring drill rod and the action of bubbles generated by high-pressure gas in the slag discharge slurry includes: The first stirring plate on the side wall of the stirring drill rod generates an upward stirring force, and the second stirring plate generates a downward stirring force, forming a spiral-shaped upward turbulent flow; wherein, the first stirring plate and the second stirring plate are inclined upward as a whole.

5. The method for treating floor heave in coal mine roadways according to claim 4, characterized in that, The upward tilt angle of the first and second stirring plates is less than or equal to 30 degrees.

6. The method for treating floor heave in coal mine roadways according to claim 1, characterized in that, The drilling rig uses a twist drill rod to drill holes downwards into the bottom plate of the mine roadway to a depth of 2-3m and a diameter of 28-200mm.

7. The method for treating floor heave in coal mine roadways according to claim 1, characterized in that, The orifice tube extends into the borehole by at least 500 mm.

8. The method for treating floor heave in coal mine roadways according to claim 1, characterized in that, The density of the slag discharge slurry is greater than that of water.

9. The method for treating floor heave in coal mine roadways according to claim 1, characterized in that, The slag discharge slurry carries the rock and coal slag to the borehole opening and flows into the sedimentation tank through the type 7 guide pipe. After sedimentation and filtration in the sedimentation tank, the slag discharge slurry is continuously injected into the borehole through the slag discharge slurry pump for recycling.

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