An underground reservoir artificial dam system and a construction method thereof

Abstract

The application discloses an underground reservoir artificial dam system and a construction method thereof. The weak area is determined in advance in the artificial dam, and a seepage pressure sensor and a grouting pipe are buried in the weak area in advance when the artificial dam is constructed. A storage cylinder storing plugging material and a liquid pump are arranged underground, and a control device is arranged in a dispatch center. The seepage pressure sensor can monitor the humidity and water pressure in the weak area in real time, and transmit the humidity value and the water pressure value to the control device. When the control device judges that the humidity value and the water pressure value reach preset humidity threshold and water pressure threshold, the liquid pump is started, the plugging material is injected into the weak area through the grouting pipe, and the seepage path is plugged. The underground reservoir artificial dam system and the construction method thereof provide a new scheme for the construction of the underground reservoir artificial dam, can automatically repair the weak area of the artificial dam, have good repair effect, have short repair period, and reduce repair cost.

Description

Technical Field

[0001] This invention relates to the field of underground reservoir technology, and in particular to an artificial dam system for underground reservoirs and its construction method. Background Technology

[0002] In coal mining, to protect groundwater resources, underground reservoirs are typically built in the goaf and roadways. The dam structure of an underground reservoir includes coal pillar dams located on both sides of the roadway and artificial dams constructed within the roadway. The bottom of the artificial dam connects to the roadway floor, and the top of the artificial dam connects to the roadway roof. The left and right sides of the artificial dam connect to the coal pillar dams on either side, sealing the inner goaf for water storage.

[0003] However, at the junction of the artificial dam body with the roadway floor, the roadway floor, and the coal pillar dam body, that is, at the boundary between the artificial dam body and the coal and rock, it is easily damaged by pressure, forming a seepage path.

[0004] In existing technologies, seepage is typically prevented by applying an anti-seepage adhesive or extending the interface between the artificial dam and the coal / rock. However, in actual use, the artificial dam, subjected to long-term pressure, will still be damaged and seepage will occur. At this point, the coal pillar dam has already formed, requiring the reconstruction of a new, sealed dam on the outside of the artificial dam. This is a massive undertaking with high repair costs and a long construction period.

[0005] In view of this, it is necessary to provide an underground reservoir artificial dam system and its construction method that facilitates the repair of seepage in artificial dam bodies. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an underground reservoir artificial dam system and its construction method that facilitates the repair of seepage in artificial dam bodies.

[0007] The present invention provides an artificial dam system for underground reservoirs, including an artificial dam body and grouting equipment; The grouting equipment includes a storage cylinder containing sealing material, a liquid pump connected to the storage cylinder, a grouting pipe connected to the liquid pump, and a control device for controlling the switching of the liquid pump. The artificial dam body has pre-determined weak areas, and one end of the grouting pipe is buried in the weak areas; A pressure sensor is embedded in the weak area, and the pressure sensor is signal-connected to the control device; When the humidity and water pressure values ​​transmitted by the osmotic pressure sensor to the control device both reach the preset humidity threshold and preset water pressure threshold, the control device controls the liquid pump to start automatically.

[0008] In one alternative technical solution, a porous pipe is connected to the end of the grouting pipe, and the porous pipe is buried in the weak area.

[0009] In one of the alternative technical solutions, a check valve is installed in the grouting pipe.

[0010] In one of the alternative technical solutions, a stirring device is installed in the storage cylinder, and the stirring device is signal-connected to the control device; The control device controls the stirring device to start ahead of the liquid pump.

[0011] The present invention also provides a method for constructing an artificial dam system for an underground reservoir as described in any of the preceding technical solutions, comprising the following steps: S01: Weak areas in the artificial dam body are pre-determined using similar simulation experiments; S02: Install dam formwork between the roadway floor, roadway roof and coal pillar dam, pour concrete to form the artificial dam, and install the seepage pressure sensor and one end of the grouting pipe in the weak area respectively; S03: The storage cylinder containing the sealing material is arranged downhole, the liquid pump is connected to the storage cylinder, and the grouting pipe is connected to the liquid pump; The control device is set up in the dispatch center, and the pressure sensor and the liquid pump are respectively connected to the control device.

[0012] In one of the optional technical solutions, step S02 further includes the following steps: During the casting and molding of the artificial dam, a first plastic sleeve and a second plastic sleeve connected to the weak area are pre-embedded. The first and second plastic sleeves were cut apart using a cutting drill bit. The pressure sensor is pushed into the cleaved second plastic sleeve, and the opening of the second plastic sleeve is sealed. Insert one end of the grouting pipe into the ruptured first plastic sleeve to seal the opening of the first plastic sleeve.

[0013] In one of the optional technical solutions, the similarity simulation experiment includes a physical similarity experiment; The physical similarity experiment includes the following steps: S01: Construct a similar experimental mold; S02: Construct a similar artificial dam body to the artificial dam body in the similar experimental mold; S03: Inject water into the similar artificial dam; S04: Apply a load to the similar artificial dam body; S05: Monitor the pressure, deformation, and seepage path of the similar artificial dam body; S06: Determine the similar damage areas of the similar artificial dams; S07: Determine the weak area in the artificial dam body based on the similar damage area of ​​the similar artificial dam body.

[0014] In one of the optional technical solutions, the similarity simulation experiment further includes a step of reconstructing a three-dimensional similar artificial dam digital model, including: The similar artificial dam body is divided into n layers of similar artificial dam body according to a preset thickness, where n is an integer ≥ 2; The similar artificial dam body is dismantled layer by layer in order from top to bottom. Each time a layer of the similar artificial dam body is dismantled, a three-dimensional laser scan is performed on the newly formed cross-section of the similar artificial dam body layer. The scanned images are digitally processed to reconstruct a three-dimensional digital model of a similar artificial dam, thereby obtaining a digital model of the similar damaged area.

[0015] In one of the alternative technical solutions, the similar experimental mold is prepared by 3D printing.

[0016] In one of the optional technical solutions, the similarity simulation experiment further includes a digital model similarity experiment; The digital model similarity experiment and the physical similarity experiment are conducted simultaneously to mutually correct the results.

[0017] The above technical solution has the following beneficial effects: The artificial dam system and construction method for underground reservoirs provided by this invention pre-determine weak areas within the artificial dam structure. During construction, seepage pressure sensors and grouting pipes are pre-installed in these weak areas. A storage tank containing sealing material and a liquid pump are placed underground, and a control device is located at the dispatch center. The seepage pressure sensors monitor the humidity and water pressure in the weak areas in real time and transmit these values ​​to the control device. When the control device determines that the humidity and water pressure values ​​have reached preset threshold values, it activates the liquid pump and injects sealing material into the weak areas through the grouting pipes to block the seepage path.

[0018] In summary, the artificial dam system and its construction method for underground reservoirs provided by this invention offer a new solution for the construction of artificial dams for underground reservoirs. It can automatically repair weak areas of the artificial dam, achieving good repair results, a short repair cycle, and reducing repair costs. Attached Figure Description

[0019] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 A perspective view of an underground reservoir artificial dam system provided in an embodiment of the present invention; Figure 2 A cross-sectional view of an artificial dam constructed between the roadway floor, roadway roof, and coal pillar dams on both sides; Figure 3 A schematic diagram showing the marked weak areas on the artificial dam structure; Figure 4 A cross-sectional view of a porous pipe and a seepage sensor embedded in a weak area of ​​an artificial dam. Figure 5 A cross-sectional view of a mixing device installed in a storage cylinder; Figure 6 A cross-sectional view of a first and second plastic sleeve pre-embedded and connected to a weak area during the casting and molding of an artificial dam. Figure 7 This is a schematic diagram showing the first and second plastic sleeves after they have been cut by the cutting drill bit. Figure 8 A schematic diagram showing the insertion of a pressure sensor into the ruptured second plastic sleeve and the insertion of one end of the grouting pipe into the ruptured first plastic sleeve. Figure 9 This is a schematic diagram of a similar experimental mold. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] like Figure 1-5 As shown, an embodiment of the present invention provides an artificial dam system for an underground reservoir, including an artificial dam body 4 and a grouting device 5.

[0022] Grouting equipment 5 includes a storage cylinder 51 containing sealing material 57, a liquid pump 52 connected to the storage cylinder 51, a grouting pipe 53 connected to the liquid pump 52, and a control device 54 for controlling the switching of the liquid pump 52.

[0023] Among them, a weak area 41 is pre-determined in the artificial dam body 4, and one end of the grouting pipe 53 is buried in the weak area 41.

[0024] A pressure sensor 6 is embedded in the weak area 41, and the pressure sensor 6 is connected to the control device 54.

[0025] When the humidity and water pressure values ​​transmitted from the pressure sensor 6 to the control device 54 both reach the preset humidity threshold and preset water pressure threshold, the control device 54 controls the liquid pump 52 to start automatically.

[0026] The artificial dam system for underground reservoirs provided by this invention mainly includes an artificial dam body 4, grouting equipment 5, and a seepage pressure sensor 6.

[0027] The artificial dam 4 is part of the underground reservoir dam. The underground reservoir dam includes coal pillar dams 3 located on both sides of the roadway. The artificial dam 4 is constructed between the two coal pillar dams 3 to seal the roadway. The lower end of the artificial dam 4 is embedded in the roadway floor 1, the upper end is embedded in the roadway roof 2, and both sides are embedded in the coal pillar dams 3 on either side. The inner side of the underground reservoir dam is a goaf area used for water storage, thus forming an underground reservoir. The outer side of the artificial dam 4 is the remaining roadway, also known as the underground area. A control room will be located in an appropriate position underground to control the operation of various electrical equipment.

[0028] The artificial dam 4 is generally constructed using molds and made of concrete. During the construction of the artificial dam 4, weak areas 41 are identified beforehand through similar simulation experiments. Weak areas 41 are generally located at the junctions of the artificial dam 4 with the roadway floor 1, roadway roof 2, and coal pillar dam 3, that is, at the junction of the artificial dam 4 and coal / rock. Weak areas 41 are weak and will break under pressure, resulting in cracks and seepage.

[0029] Grouting equipment 5 is used for later repair of weak areas 41 of the artificial dam body 4 to seal cracks and prevent seepage.

[0030] Grouting equipment 5 includes a storage cylinder 51, a liquid pump 52, a grouting pipe 53, and a control device 54.

[0031] The storage cylinder 51 is located underground and stores sealing material 57, which can be methyl methacrylate (MMA). The top of the storage cylinder 51 has an outlet pipe 58 and an inlet pipe 59. The inlet of the liquid pump 52 is connected to the outlet pipe 58, and one end of the grouting pipe 53 is connected to the outlet of the liquid pump 52. The other end of the grouting pipe 53 is buried in the weak area 41 to inject the sealing material 57 into the weak area 41 to seal the cracks generated in the weak area 41 and prevent seepage.

[0032] The feed pipe 59 is connected to an external sealing material feeding device. A liquid level sensor is installed in the storage cylinder 51. When the sealing material 57 in the storage cylinder 51 is lower than the liquid level sensor, the liquid level sensor will send a signal to the sealing material feeding device, and the sealing material feeding device will automatically replenish the storage cylinder 51.

[0033] The control device 54 is located in the control room, and the pressure sensor 6 is embedded in the weak area 41. The pressure sensor 6 is connected to the control device 54 via a wire to transmit signals.

[0034] The pressure sensor 6 has both humidity and water pressure monitoring functions. The pressure sensor 6 can be a combination of a humidity sensor and a water pressure sensor.

[0035] As needed, multiple water pressure sensors 42 can be arranged along the vertical direction of the weak area 41 on the inner side of the artificial dam body 4. Each water pressure sensor 42 is connected to the control device 54 via a wire. Along the top-to-bottom direction, one water pressure sensor 42 is located at the top of the weak area 41, at least one water pressure sensor 42 is located in the middle of the weak area 41, and one water pressure sensor 42 is located at the bottom of the weak area 41. Assuming the pressure value of the water pressure sensor 42 at the top of the weak area 41 is F1, and the pressure value of the water pressure sensor 42 at the bottom of the weak area 41 is F2, then F1 < F2.

[0036] When seepage occurs in the weak area 41 due to pressure damage causing cracks, water will pass through the pressure sensor 6. The pressure sensor 6 monitors the humidity and water pressure values ​​in real time.

[0037] The control device 54 has preset humidity threshold and preset water pressure threshold. For example, the preset humidity threshold is 1 and the preset water pressure threshold is between F1 and F2.

[0038] When the humidity and water pressure values ​​transmitted from the seepage pressure sensor 6 to the control device 54 both reach the preset humidity threshold and preset water pressure threshold, the control device 54 controls the liquid pump 52 to start automatically. The sealing material 57 in the storage cylinder 51 is drawn out by the liquid pump 52 and injected into the weak area 41 through the grouting pipe 53 to block the seepage path.

[0039] In summary, the artificial dam system for underground reservoirs provided by this invention offers a new solution for the construction of artificial dams for underground reservoirs. It can automatically repair the weak areas 41 of the artificial dam 4, with good repair effect, short repair cycle, and reduced repair cost.

[0040] In one embodiment, such as Figure 4 and Figure 8As shown, the end of the grouting pipe 53 is connected to a porous pipe 531, which is buried in the weak area 41. The porous pipe 531 includes multiple funnel-shaped grout outlets, which facilitate the diffusion of the sealing material 57 into the weak area 41.

[0041] In one embodiment, such as Figure 4 As shown, a check valve 55 is installed in the grouting pipe 53. The check valve 55 is a one-way valve. When grouting is not performed, it can prevent water from flowing back into the storage cylinder 51 through the grouting pipe 53.

[0042] In one embodiment, such as Figure 5 As shown, a stirring device 56 is installed in the storage cylinder 51, and the stirring device 56 is connected to the control device 54 via a signal connection. The control device 54 controls the stirring device 56 to start the liquid pump 52 in advance.

[0043] The stirring device 56 is used to stir the sealing material 57 in the storage cylinder 51, so as to uniformly mix the sealing material 57. The stirring device 56 is connected to the control device 54 via a wire, and the control device 54 controls the operation of the stirring device 56.

[0044] When the control device 54 needs to control the liquid pump 52 to start, the stirring device 56 is turned on first, and the sealing material 57 drawn from the liquid pump 52 is mixed evenly.

[0045] The timing of the stirring device 56's pre-start of the liquid pump 52 can be set according to actual needs, such as 2 minutes, 3 minutes, or 5 minutes ahead. That is, when the humidity and water pressure values ​​transmitted from the pressure sensor 6 to the control device 54 both reach the aforementioned preset humidity and water pressure thresholds, the control device 54 first controls the stirring device 56 to start, and after the aforementioned preset pre-start time, the control device 54 then controls the liquid pump 52 to start automatically.

[0046] In one embodiment, such as Figure 6-8 As shown, a first plastic sleeve 7 and a second plastic sleeve 8 are embedded in the artificial dam body 4, which are connected to the weak area 41 and cut by the cutting drill bit.

[0047] The pressure sensor 6 is installed in the cut second plastic sleeve 8. The outer opening of the second plastic sleeve 8 is sealed to facilitate the installation of the pressure sensor 6 and to prevent the pressure sensor 6 from being damaged by the concrete of the artificial dam 4. The cut second plastic sleeve 8 has many gaps and holes, the size of which is controlled by the cutting drill bit. Water can enter the cut second plastic sleeve 8 through the inner opening, gaps, and holes, and be detected by the pressure sensor 6.

[0048] One end of the grouting pipe 53 is inserted into the ruptured first plastic sleeve 7. The outer opening of the first plastic sleeve 7 is sealed with a sealing structure to facilitate insertion into the end of the grouting pipe 53 or the perforated pipe 531, and also to prevent the concrete of the artificial dam 4 from blocking the grout outlet of the grouting pipe 53. The ruptured first plastic sleeve 7 has many gaps and holes, the size of which is controlled by the cutting drill bit. The sealing material 57 can enter the cracks in the weak area 41 through the inner opening, gaps, and holes of the ruptured first plastic sleeve 7.

[0049] The sealing structure can be concrete, sealing rings, etc. The outer cylinder opening referred to here refers to the cylinder opening where the plastic sleeve is on or extends from the outer surface of the artificial dam body 4, and the inner cylinder opening refers to the cylinder opening where the plastic sleeve extends into the weak area 41.

[0050] Combination Figure 1-5 As shown, an embodiment of the present invention provides a method for constructing an artificial dam system for an underground reservoir, comprising the following steps: S01: Using similar simulation experiments, the weak area 41 in the artificial dam body 4 is determined in advance.

[0051] S02: Install the dam formwork between the roadway floor 1, the roadway roof 2 and the coal pillar dam 3, pour concrete to form an artificial dam 4, and install the seepage pressure sensor 6 and one end of the grouting pipe 53 in the weak area 41 respectively.

[0052] S03: A storage cylinder 51 containing sealing material 57 is arranged downhole, a liquid pump 52 is connected to the storage cylinder 51, and a grouting pipe 53 is connected to the liquid pump 52.

[0053] A control device 54 is set up in the dispatch center, and the pressure sensor 6 and the liquid pump 52 are connected to the control device 54 respectively.

[0054] The construction method for an artificial dam system for underground reservoirs provided by this invention comprises the following steps: Grooves are pre-cut on the surfaces of the roadway floor 1, roadway roof 2, and coal pillar dam 3 to form embedding grooves, which are then embedded into the ends of the artificial dam 4.

[0055] Similarity simulation experiments were used to simulate the roadway floor 1, roadway roof 2, coal pillar dam 3, and artificial dam 4. By loading, injecting fluorescent water, and monitoring, weak areas 41 were identified on the artificial dam 4.

[0056] A dam formwork is installed between the roadway floor slab 1, the roadway roof slab 2, and the coal pillar dam body 3. Concrete is then poured into the dam formwork using a concrete grouting device to form an artificial dam body 4.

[0057] During or after the formation of the artificial dam 4, the pressure sensor 6 and one end of the grouting pipe 53 are respectively installed in the weak area 41.

[0058] The grouting equipment 5 is arranged, specifically: a storage cylinder 51 is arranged downhole, containing sealing material 57. A liquid pump 52 is connected to the discharge pipe 58 of the storage cylinder 51, and the inlet end of the grouting pipe 53 is connected to the liquid pump 52. A control device 54 is arranged in the dispatch center, and the wires of the pressure sensor 6 and the liquid pump 52 are connected to the control device 54.

[0059] In one embodiment, such as Figure 6-8 As shown, step S02 also includes the following steps: When casting the artificial dam body 4, a first plastic sleeve 7 and a second plastic sleeve 8 are pre-embedded to connect to the weak area 41.

[0060] The first plastic sleeve 7 and the second plastic sleeve 8 were cut apart using a cutting drill bit.

[0061] The pressure sensor 6 is pushed into the cleaved second plastic sleeve 8 to seal the opening of the second plastic sleeve 8.

[0062] Insert one end of the grouting pipe 53 into the ruptured first plastic sleeve 7 to seal the opening of the first plastic sleeve 7.

[0063] The pressure sensor 6 is installed in the cut second plastic sleeve 8. The outer opening of the second plastic sleeve 8 is sealed to facilitate the installation of the pressure sensor 6 and to prevent the pressure sensor 6 from being damaged by the concrete of the artificial dam 4. The cut second plastic sleeve 8 has many gaps and holes, the size of which is controlled by the cutting drill bit. Water can enter the cut second plastic sleeve 8 through the inner opening, gaps, and holes, and be detected by the pressure sensor 6.

[0064] One end of the grouting pipe 53 is inserted into the ruptured first plastic sleeve 7. The outer opening of the first plastic sleeve 7 is sealed with a sealing structure to facilitate insertion into the end of the grouting pipe 53 or the perforated pipe 531, and also to prevent the concrete of the artificial dam 4 from blocking the grout outlet of the grouting pipe 53. The ruptured first plastic sleeve 7 has many gaps and holes, the size of which is controlled by the cutting drill bit. The sealing material 57 can enter the cracks in the weak area 41 through the inner opening, gaps, and holes of the ruptured first plastic sleeve 7.

[0065] In one embodiment, such as Figure 9 As shown, similarity simulation experiments include physical similarity experiments.

[0066] Physical similarity experiments include the following steps: S01: Construct a similar experimental mold.

[0067] S02: Construct a similar artificial dam 104, which is similar to the artificial dam 4, in a similar experimental mold.

[0068] S03: Inject water into the similar artificial dam body 104.

[0069] S04: Apply load to the similar artificial dam body 104.

[0070] S05: Monitor the pressure, deformation, and seepage path of similar artificial dam body 104.

[0071] S06: Determine the similar failure areas of similar artificial dam bodies 104.

[0072] S07: Based on the similar failure areas of similar artificial dam bodies 104, the weak area 41 in artificial dam body 4 is determined.

[0073] The experimental steps for using physical similarity experiments are as follows: A three-dimensional scan was performed on the surfaces of the embedded grooves in the roadway roof 2, roadway floor 1, and coal pillar dam 3 to obtain the geometric morphology data of the embedded groove surfaces. Based on the geometric morphology data of the embedded groove surfaces, geometric feature graphics of the embedded groove surfaces were drawn, and a similar experimental mold was prepared according to the requirements of physical similarity simulation experiments.

[0074] The similar experimental mold includes a box-shaped structure with glass on both the front and back sides for easy observation. The box contains a similar bottom plate 101, a similar top plate 102, and a similar coal pillar dam 103. Concrete is poured between the similar bottom plate 101, the similar top plate 102, and the similar coal pillar dam 103 to form a similar artificial dam 104. A vertical loading system and a water injection system are arranged on the top of the similar top plate 102, and a lateral loading system is arranged on the side of the similar coal pillar dam 103. Vertical pressure sensors 105 are arranged in the similar bottom plate 101 and the similar top plate 102, and lateral pressure sensors 106 are arranged in the similar coal pillar dam 103. The vertical loading system and the lateral loading system can be either pistons or air bladders. The water injection system provides fluorescent water for later observation of the water channels within the similar artificial dam 104 using a camera.

[0075] After the similar artificial dam 104 is formed, water is first injected into the similar artificial dam 104 from the top through a water injection system, and fluorescent lamps are used to irradiate the similar artificial dam 104.

[0076] Then, pressure is applied to the similar artificial dam body 104 through the vertical loading system and the lateral loading system in a preset sequence. The pressure can be monitored by the vertical pressure sensor 105 and the lateral pressure sensor 106.

[0077] The water flow path is captured by a camera to determine the location and area of ​​leakage, which is to obtain similar damage areas of the similar artificial dam 104. Then, based on the similarity ratio of the similarity experiment, the weak area 41 is determined on the artificial dam 4.

[0078] In one embodiment, the similarity simulation experiment further includes a step of reconstructing a three-dimensional similar artificial dam body 104 digital model, including: The similar artificial dam body 104 is divided into n layers of similar artificial dam body according to a preset thickness, where n is an integer ≥ 2.

[0079] The similar artificial dam body was dismantled layer by layer in a top-to-bottom order. Each time a layer of the similar artificial dam body was dismantled, a three-dimensional laser scan was performed on the newly formed cross-section of the similar artificial dam body layer.

[0080] The scanned images were digitally processed to reconstruct a 3D digital model of a similar artificial dam body (model 104), and a digital model of the similar damaged area was obtained.

[0081] In this embodiment, after the similar experiment is completed, when the similar experiment mold is removed, the similar artificial dam 104 is divided into two or more layers. One layer is removed from top to bottom at a time, and the cross-section between the layers of the two adjacent similar artificial dams is scanned by three-dimensional laser to obtain a digital model of the similar damage area. The location and mode of damage can be seen more intuitively on the computer.

[0082] In one embodiment, a similar experimental mold is prepared using 3D printing. When creating the similar experimental mold, the roadway roof 2, roadway floor 1, and coal pillar dam 3 are fabricated using 3D printing, ensuring that their embedded groove appearance is identical to the actual structure, thus improving the accuracy of the experimental results.

[0083] 3D printing process: Three-dimensional laser scanning data is used to create a model using CATIA software, and the experimental mold is printed using SLA (stereolithography) technology.

[0084] In one embodiment, the similarity simulation experiment also includes a digital model similarity experiment.

[0085] Digital model similarity experiments and physical similarity experiments were conducted simultaneously to mutually correct the results.

[0086] In this embodiment, during the physical similarity experiment, a digital model similarity experiment is also conducted using computer software (e.g., Comsol software). The two methods corroborate each other and correct the results, thus improving the accuracy of the experimental results. Depending on the needs, the above technical solutions can be combined to achieve the best technical effect.

[0087] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. An artificial dam system for an underground reservoir, characterized in that, This includes the artificial dam structure and grouting equipment; The grouting equipment includes a storage cylinder containing sealing material, a liquid pump connected to the storage cylinder, a grouting pipe connected to the liquid pump, and a control device for controlling the switching of the liquid pump. The artificial dam body has pre-determined weak areas, and one end of the grouting pipe is buried in the weak areas; A similarity simulation experiment is used to pre-determine the weak areas in the artificial dam. The similarity simulation experiment includes a physical similarity experiment, which comprises the following steps: constructing a similarity experiment mold; building a similar artificial dam within the similarity experiment mold; injecting water into the similar artificial dam; applying a load to the similar artificial dam; monitoring the pressure, deformation, and seepage path of the similar artificial dam; determining the similar failure areas of the similar artificial dam; and determining the weak areas in the artificial dam based on the similar failure areas. A seepage pressure sensor is embedded in the weak area, and the seepage pressure sensor is signal-connected to the control device. When the humidity and water pressure values ​​transmitted by the osmotic pressure sensor to the control device both reach the preset humidity threshold and preset water pressure threshold, the control device controls the liquid pump to start automatically.

2. The underground reservoir artificial dam system according to claim 1, characterized in that, The end of the grouting pipe is connected to a porous pipe, which is buried in the weak area.

3. The underground reservoir artificial dam system according to claim 1, characterized in that, A check valve is installed in the grouting pipe.

4. The underground reservoir artificial dam system according to any one of claims 1-3, characterized in that, A stirring device is installed in the storage cylinder, and the stirring device is signal-connected to the control device. The control device controls the stirring device to start ahead of the liquid pump.

5. A method for constructing an artificial dam system for an underground reservoir as described in any one of claims 1-4, characterized in that, Includes the following steps: S01: Weak areas in the artificial dam body are pre-determined using similar simulation experiments; S02: Install the dam formwork between the roadway floor, roadway roof and coal pillar dam, pour concrete to form the artificial dam, and install the seepage pressure sensor and one end of the grouting pipe in the weak area respectively; S03: The storage cylinder containing the sealing material is arranged downhole, the liquid pump is connected to the storage cylinder, and the grouting pipe is connected to the liquid pump; The control device is set up in the dispatch center, and the pressure sensor and the liquid pump are respectively connected to the control device.

6. The construction method according to claim 5, characterized in that, Step S02 also includes the following steps: During the casting and molding of the artificial dam, a first plastic sleeve and a second plastic sleeve connected to the weak area are pre-embedded. The first and second plastic sleeves were cut apart using a cutting drill bit. The pressure sensor is pushed into the cleaved second plastic sleeve, and the opening of the second plastic sleeve is sealed. Insert one end of the grouting pipe into the ruptured first plastic sleeve to seal the opening of the first plastic sleeve.

7. The construction method according to claim 5, characterized in that, The similarity simulation experiment also includes a step of reconstructing a three-dimensional similar artificial dam digital model, including: The similar artificial dam body is divided into n layers of similar artificial dam body according to a preset thickness, where n is an integer ≥ 2; The similar artificial dam body is dismantled layer by layer in order from top to bottom. Each time a layer of the similar artificial dam body is dismantled, a three-dimensional laser scan is performed on the newly formed cross-section of the similar artificial dam body layer. The scanned images are digitally processed to reconstruct a three-dimensional digital model of a similar artificial dam, thereby obtaining a digital model of the similar damaged area.

8. The construction method according to claim 5, characterized in that, The similar experimental mold was prepared using 3D printing.

9. The construction method according to claim 5, characterized in that, The similarity simulation experiment also includes a digital model similarity experiment; The digital model similarity experiment and the physical similarity experiment were conducted simultaneously to mutually correct the results.

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