Impermeable material and preparation method thereof, coal mine underground reservoir dam body and construction method thereof

Abstract

The invention provides an anti-seepage material and a preparation method thereof, a coal mine underground reservoir dam body and a construction method of the coal mine underground reservoir dam body, and the anti-seepage material comprises the following components in percentage by weight: 58.66-60.53 wt% of a matrix I; 1.87 wt% to 3.74 wt% of a matrix II; 0.16 wt% to 0.25 wt% of a water reducing agent; and 36.66 wt% to 37.44 wt% of water. Wherein the matrix I comprises cement, fly ash and silica fume in a mass ratio of (1-1.2): (0.4-0.5): (0.15-0.2); the matrix II is prepared from silicon dioxide, aluminum oxide and titanium dioxide according to the mass ratio of (0.3 to 0.35) to (1 to 1.1) to (0.05 to 0.1). By means of the technical scheme, the problem that in the prior art, a dam body of a coal mine underground reservoir is prone to leakage can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-seepage in mining engineering, and in particular to an anti-seepage material and a preparation method thereof, a dam body of a coal mine underground reservoir and a construction method thereof. Background Art

[0002] At present, in order to store and utilize the mine water produced by coal mining and solve the problem of water shortage in the arid mining areas in the west, reservoirs are usually set up underground in coal mines to store mine water.

[0003] In the prior art, coal mine underground reservoirs usually use the coal pillars of coal mine underground reservoirs as dam bodies, but there are gaps between the coal pillars, so the main water retaining dam bodies of current coal mine underground reservoirs are usually composed of coal pillars and artificial dam bodies. The main bearing structure of the artificial dam body is a concrete wall, which has steel bars arranged inside and connected to the surrounding rock through embedded grooves. The existing artificial dam body is constructed of concrete, which is easily soaked by mine water during the long-term operation of the underground reservoir, resulting in internal steel bars rusting, concrete performance degradation, leakage problems, and the risk of artificial dam body damage, which brings safety hazards to coal mine production. Summary of the invention

[0004] The invention provides an anti-seepage material and a preparation method thereof, a coal mine underground water reservoir dam body and a construction method thereof, so as to solve the problem that the coal mine underground water reservoir dam body is prone to leakage in the prior art.

[0005] According to one aspect of the present invention, a waterproofing material is provided, which comprises, by weight percentage: 58.66wt% to 60.53wt% of matrix one; 1.87wt% to 3.74wt% of matrix two; 0.16wt% to 0.25wt% of water reducer; 36.66wt% to 37.44wt% of water; wherein, matrix one comprises cement, fly ash and silica fume in a mass ratio of (1 to 1.2): (0.4 to 0.5): (0.15 to 0.2); matrix two comprises silicon dioxide, aluminum oxide and titanium dioxide in a mass ratio of (0.3 to 0.35): (1 to 1.1): (0.05 to 0.1).

[0006] Furthermore, in the matrix 1, the particle size of the cement is ≥500 mesh.

[0007] Furthermore, the fly ash is Class I fly ash, and the water reducer is a lignin sulfonate water reducer, a sulfonate water reducer, a melamine water reducer or a polycarboxylic acid water reducer.

[0008] According to another aspect of the present invention, there is provided a method for preparing an anti-seepage material, wherein the anti-seepage material is the above-mentioned anti-seepage material, and the preparation method comprises the following steps: mixing cement, fly ash and silica ash according to a mass ratio and stirring evenly to obtain a matrix one; mixing silicon dioxide, aluminum oxide and titanium dioxide according to a mass ratio and stirring evenly to obtain a matrix two; adding water to the matrix one according to a mass ratio, stirring to obtain a matrix three, and adding the matrix two and a water reducer to the matrix three according to a mass ratio to obtain an anti-seepage material.

[0009] According to another aspect of the present invention, a dam body of an underground water reservoir in a coal mine is provided, and the dam body of the underground water reservoir in the coal mine comprises: a first coal pillar section and a second coal pillar section, the first coal pillar section and the second coal pillar section are arranged at intervals in the horizontal direction, and there is a gap between the first coal pillar section and the second coal pillar section, a first groove is arranged on the side wall of the first coal pillar section facing the second coal pillar section, and a second groove is arranged on the side wall of the second coal pillar section facing the first coal pillar section; an embedded groove, the embedded groove is arranged at the interval, the embedded groove has an opening, the opening is arranged toward the reservoir, the side wall of the embedded groove has a first protrusion and a second protrusion arranged oppositely, the first protrusion extends into the first groove, and the second protrusion extends into the second groove; an artificial section, the artificial section is filled in the embedded groove, and a first impermeable layer is arranged on the surface of the artificial section facing the reservoir, and the first impermeable layer is made of the above-mentioned impermeable material.

[0010] Furthermore, a second anti-seepage layer is arranged between the artificial section and the inner wall of the embedded groove, on the top plate of the artificial section and the coal mine rock layer, and on the bottom plate of the artificial section and the coal mine rock layer. The second anti-seepage layer is made of the above-mentioned anti-seepage material.

[0011] Furthermore, a supporting wall is arranged on the side of the embedded groove facing away from the reservoir, and a third anti-seepage layer is arranged between the supporting wall and the embedded groove, and the third anti-seepage layer is made of the above-mentioned anti-seepage material.

[0012] According to another aspect of the present invention, a construction method for a coal mine underground reservoir dam body is provided, and the coal mine underground reservoir dam body is the above-mentioned coal mine underground reservoir dam body, and the construction method comprises: opening a first groove and a second groove on a first coal pillar section and a second coal pillar section, and inserting an embedded groove between the first coal pillar section and the second coal pillar section; setting up a template at the opening of the embedded groove, and injecting grout into the embedded groove to form an artificial section; removing the template, and spraying an anti-seepage material on the side of the artificial section facing the reservoir to form a first anti-seepage layer.

[0013] Furthermore, before grouting into the embedded groove, the construction method also includes: spraying an anti-seepage material on the inner wall of the embedded groove, the top plate of the coal mine rock layer and the bottom plate of the coal mine rock layer to form a second anti-seepage layer.

[0014] Furthermore, before setting up the formwork at the opening of the embedded groove, the construction method also includes: setting grouting ducts on the top plate, the bottom plate, the first coal pillar section and the second coal pillar section, and injecting grout into the embedded groove through the grouting ducts to form an artificial section; after spraying the first anti-seepage layer, the construction method also includes: injecting anti-seepage material through the grouting ducts.

[0015] The technical solution provided by the present invention has the following beneficial effects:

[0016] The anti-seepage material prepared by the preparation method provided by the present invention has better physical strength and better anti-seepage effect. After being sprayed on the surface of the dam body of the coal mine underground reservoir, the anti-seepage effect of the artificial dam body of the underground reservoir can be effectively improved.

[0017] The dam body of the underground reservoir of a coal mine provided by the present invention has an embedded groove between the first coal pillar section and the second coal pillar section, and an artificial section is filled in the embedded groove, which can facilitate the molding of the artificial section and ensure the structural stability of the artificial section. In addition, the present application provides multi-layer protection by providing a first impermeable layer, a second impermeable layer and a third impermeable layer, which can reduce the leakage of the artificial section, reduce the corrosion of the steel bars inside the artificial section, thereby increasing the service life of the artificial section and improving the safety performance of the dam body of the underground reservoir of the coal mine.

[0018] By applying the construction method provided by the present invention, it is possible to spray anti-seepage materials according to the construction sequence in combination with the construction process of the coal mine underground reservoir dam body, thereby improving the anti-seepage performance of the coal mine underground reservoir dam body as a whole, and providing effective anti-seepage materials and technical methods for the construction of artificial dam bodies of coal mine underground reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of the embedded groove provided by the present invention installed between the first coal pillar section and the second coal pillar section from a top view is shown;

[0021] Figure 2 It shows a schematic diagram of the structure of the steel wire mesh installed in the embedded groove provided by the present invention from a top view;

[0022] Figure 3 It shows a schematic diagram of the structure of the embedding groove provided by the present invention, in which a template is set up at the opening, viewed from a top view;

[0023] Figure 4 It shows a schematic diagram of the structure of the present invention after grouting in the embedded groove from a top view;

[0024] Figure 5It shows a schematic structural diagram of the dam body of an underground coal mine reservoir provided by the present invention from a bird's-eye view;

[0025] Figure 6 Shows Figure 5 Sectional view at AA in the middle;

[0026] Figure 7 The schematic diagram of the structure of the underground coal mine reservoir dam provided by the present invention is shown from a front view perspective.

[0027] The above drawings include the following reference numerals:

[0028] 01. Top plate; 02. Bottom plate; 03. Formwork; 04. Grouting duct;

[0029] 100, first coal pillar section; 200, second coal pillar section;

[0030] 300, embedded groove; 301, opening; 310, first protrusion; 320, second protrusion;

[0031] 400, artificial section; 410, first anti-seepage layer;

[0032] 500. Support wall. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] An embodiment of the present invention provides an anti-seepage material. Calculated by weight percentage, the anti-seepage material includes 58.66wt% to 60.53wt% of a matrix 1, 1.87wt% to 3.74wt% of a matrix 2, 0.16wt% to 0.25wt% of a water reducing agent, and 36.66wt% to 37.44wt% of water.

[0035] Among them, matrix one includes cement, fly ash and silica ash in a mass ratio of (1-1.2):(0.4-0.5):(0.15-0.2), the cement is commercially available ultrafine cement with a particle size ≥500 mesh, the fly ash is Class I fly ash, which is a by-product of the production process of coal mines and power plants, the SiO2 content in the silica ash is ≥92wt%, the fineness of which is less than 1um accounts for more than 80wt%, the average particle size is 0.1-0.3um, and the manufacturer is Baotou Xuyang Silicon Material Technology Co., Ltd.

[0036] The second matrix comprises silicon dioxide, aluminum oxide and titanium dioxide in a mass ratio of (0.3-0.35):(1-1.1):(0.05-0.1), and the average particle size of silicon dioxide, aluminum oxide and titanium dioxide is 200-300nm.

[0037] Wherein, the water reducer is a lignin sulfonate water reducer, a sulfonate water reducer, a melamine water reducer or a polycarboxylate water reducer.

[0038] Among them, municipal water is selected, and mine water is not used.

[0039] Example 1

[0040] The raw materials of the anti-seepage material include a matrix one formed by a mixture of cement, fly ash and silica fume in a mass percentage of 1:0.5:0.2, a cement particle size of 600 mesh, a matrix two formed by a mixture of silicon dioxide, aluminum oxide and titanium dioxide in a mass percentage of 0.3:1:0.1, and a water reducer of lignin sulfonate water reducer.

[0041] The anti-seepage material is prepared by the following steps:

[0042] Step 1: Cement, fly ash and silica fume are mixed and stirred to obtain a matrix 1, and silicon dioxide, aluminum oxide and titanium dioxide are mixed to obtain a matrix 2;

[0043] Step 2: Add water to the matrix 1 according to the mass ratio and stir to form a paste-like mixture;

[0044] Step 3: Add a water reducing agent and a second matrix to the paste mixture obtained in step 2, and continue stirring until the mixture is uniform to obtain an anti-seepage material.

[0045] In the above steps, the mass percentage of the substrate 1 is 58.66wt%, the mass percentage of the substrate 2 is 2.17wt%, the mass percentage of the water reducing agent is 0.17wt%, and the mass percentage of water is 37.40wt%.

[0046] Example 2

[0047] The raw materials of the anti-seepage material include a matrix one formed by a mixture of cement, fly ash and silica fume in a mass percentage of 1:0.5:0.2, a cement particle size of 600 mesh, a matrix two formed by a mixture of silicon dioxide, aluminum oxide and titanium dioxide in a mass percentage of 0.3:1:0.1, and a water reducer of lignin sulfonate water reducer.

[0048] The steps for making the anti-seepage material are the same as above, except that the mass percentage of the matrix one is 59.20wt%, the mass percentage of the matrix two is 2.64wt%, the mass percentage of the water reducer is 0.19wt%, and the mass percentage of water is 36.70wt%.

[0049] Example 3

[0050] The raw materials of the anti-seepage material include a matrix one formed by a mixture of cement, fly ash and silica fume in a mass percentage of 1:0.5:0.2, a cement particle size of 600 mesh, a matrix two formed by a mixture of silicon dioxide, aluminum oxide and titanium dioxide in a mass percentage of 0.3:1:0.1, and a water reducer of lignin sulfonate water reducer.

[0051] The steps for making the anti-seepage material are the same as above, except that the mass percentage of the matrix one is 60.15wt%, the mass percentage of the matrix two is 1.90wt%, the mass percentage of the water reducer is 0.20wt%, and the mass percentage of water is 37.20wt%.

[0052] Example 4

[0053] The raw materials of the anti-seepage material include a matrix one formed by a mixture of cement, fly ash and silica fume in a mass percentage of 1.1:0.4:0.2, a cement particle size of 600 mesh, a matrix two formed by a mixture of silicon dioxide, aluminum oxide and titanium dioxide in a mass percentage of 0.3:1.05:0.08, and a water reducer of lignin sulfonate water reducer.

[0054] The steps for making the anti-seepage material are the same as above, except that the mass percentage of the matrix one is 59.70wt%, the mass percentage of the matrix two is 1.90wt%, the mass percentage of the water reducer is 0.17wt%, and the mass percentage of water is 37.40wt%.

[0055] Example 5

[0056] The raw materials of the anti-seepage material include a matrix one formed by a mixture of cement, fly ash and silica fume in a mass percentage of 1.15:0.45:0.2, a cement particle size of 600 mesh, a matrix two formed by a mixture of silicon dioxide, aluminum oxide and titanium dioxide in a mass percentage of 0.32:1:0.1, and a water reducer of lignin sulfonate water reducer.

[0057] The steps for making the anti-seepage material are the same as above, except that the mass percentage of the matrix one is 59.90wt%, the mass percentage of the matrix two is 1.88wt%, the mass percentage of the water reducer is 0.21wt%, and the mass percentage of water is 37.66wt%.

[0058] Example 6

[0059] The raw materials of the anti-seepage material include a matrix one formed by a mixture of cement, fly ash and silica fume in a mass percentage of 1.2:0.5:0.1, a cement particle size of 600 mesh, a matrix two formed by a mixture of silicon dioxide, aluminum oxide and titanium dioxide in a mass percentage of 0.35:1.1:0.05, and a water reducer of lignin sulfonate water reducer.

[0060] The steps for making the anti-seepage material are the same as above, except that the mass percentage of the matrix one is 59.40wt%, the mass percentage of the matrix two is 3.12wt%, the mass percentage of the water reducer is 0.18wt%, and the mass percentage of water is 37.15wt%.

[0061] Comparative Example 1

[0062] No silica fume is added to the matrix 1, and the remaining components and steps are the same as those in Example 1.

[0063] Comparative Example 2

[0064] Without adding the matrix 2, the mass percentage of the matrix 1 is 61.6wt%, the mass percentage of the water reducer is 0.21wt%, the mass percentage of water is 38.40wt%, and the remaining components and steps are the same as those in Example 1.

[0065] The test results of various indicators of the anti-seepage materials obtained in Examples 1-6 and Comparative Examples 1-2 after curing for 24 hours are shown in Table 1.

[0066] Table 1 Various indicators of anti-seepage materials in different embodiments and comparative examples

[0067]

[0068] Through the above embodiments and comparative examples, it can be found that by using the formula system of the present invention, the ultrafine cement-based material formed by combining cement, silica fume and fly ash, and the nano-additive material mixed with silica, aluminum oxide and titanium dioxide, can obtain an anti-seepage material with strong physical and mechanical parameters. Compared with the components without adding silica fume in comparative example 1, the strength of the anti-seepage material formed in comparative example 1 is relatively poor, and the permeability is relatively high; Example 3 does not add silica fume and sodium chloride, and its strength and impermeability are also relatively poor. Compared with the components without adding nano-additive materials in comparative example 1, the strength effect of the anti-seepage material formed in comparative example 1 is poor and the permeability is higher. By applying the technical solution provided by the present application, an anti-seepage material with better anti-seepage performance and durability can be obtained. After the anti-seepage material provided by the present application is sprayed on the surface of the dam body of the underground reservoir of the coal mine, the anti-seepage effect of the artificial dam body of the underground reservoir can be effectively improved.

[0069] According to another embodiment of the present application, a dam body of a coal mine underground reservoir is provided, referring to Figures 5 to 7As shown, the dam of the underground water reservoir of the coal mine includes a first coal pillar section 100, a second coal pillar section 200, an embedded groove 300 and an artificial section 400. The first coal pillar section 100 and the second coal pillar section 200 are arranged at intervals in the horizontal direction, and there is an interval between the first coal pillar section 100 and the second coal pillar section 200. A first groove is arranged on the side wall of the first coal pillar section 100 facing the second coal pillar section 200, and a second groove is arranged on the side wall of the second coal pillar section 200 facing the first coal pillar section 100. The embedded groove 300 is arranged at the interval, and the embedded groove 300 has an opening 301, and the opening 301 is arranged toward the reservoir. The side wall of the embedded groove 300 has a first protrusion 310 and a second protrusion 320 arranged oppositely, and the first protrusion 310 extends into the first groove, and the second protrusion 320 extends into the second groove. The artificial segment 400 is filled in the embedding groove 300 , and a first impermeable layer 410 is provided on the surface of the artificial segment 400 facing the reservoir, and the first impermeable layer 410 is made of the above-mentioned impermeable material.

[0070] By applying the coal mine underground reservoir dam provided by the present application, an embedded groove 300 is set between the first coal pillar section 100 and the second coal pillar section 200, and an artificial section 400 is filled in the embedded groove 300, the dam structure can be supplemented artificially to connect the broken coal pillars. In the present application, by setting the embedded groove 300, the artificial section 400 can be easily formed, and the first protrusion 310 cooperates with the first groove, and the second protrusion 320 cooperates with the second groove, which can form a stop for the embedded groove 300, prevent the artificial section 400 and the embedded groove 300 from shifting under water pressure, and ensure the structural stability of the artificial section 400. By setting the first impermeable layer 410 on the side of the artificial section 400 facing the reservoir, the leakage of the artificial section 400 can be reduced, the corrosion of the steel bars inside the artificial section 400 can be reduced, and the service life of the artificial section 400 can be increased, and the safety performance of the coal mine underground reservoir dam can be improved.

[0071] Specifically, the embedding groove 300 provided in the present application can be formed by cement masonry.

[0072] Specifically, the artificial segment 400 provided in the present application can be formed by casting C40 concrete in combination with a steel mesh.

[0073] Furthermore, a second impermeable layer is provided between the artificial section 400 and the inner wall of the embedded groove 300, between the artificial section 400 and the top plate 01 of the coal mine rock layer, and between the artificial section 400 and the bottom plate 02 of the coal mine rock layer. The second impermeable layer is made of the above-mentioned impermeable material. Such a configuration can reduce the leakage of water from the artificial section 400 to the embedded groove 300, and further ensure the water blocking effect between the embedded groove 300 and the artificial section 400.

[0074] Furthermore, a support wall 500 is provided on the side of the embedded trough 300 away from the reservoir, and a third impermeable layer is provided between the support wall 500 and the embedded trough 300, and the third impermeable layer is made of the impermeable material of any one of claims 1 to 4. Through the above arrangement, the support wall 500 can form a support for the embedded trough 300 when constructing the embedded trough 300, which is convenient for the arrangement of the embedded trough 300, and at the same time, after the artificial section 400 is cast in the later stage, it provides support for the artificial section 400 and the embedded trough 300, thereby improving the load capacity of the dam body of the artificial section 400. The third impermeable layer is provided between the support wall 500 and the embedded trough 300, which can further improve the anti-seepage effect of the dam body of the coal mine underground reservoir provided by the present application.

[0075] Specifically in the present application, the thickness of the first anti-seepage layer 410 , the second anti-seepage layer and the third anti-seepage layer are not less than 2 cm.

[0076] According to another aspect of the present application, a construction method for a coal mine underground reservoir dam body is provided. The construction method is used to construct the above-mentioned coal mine underground reservoir dam body. The construction method comprises:

[0077] S1: Figure 1 As shown, a support wall 500 is built in the interval between the first coal pillar section 100 and the second coal pillar section 200, and a third anti-seepage layer is sprayed on the support wall 500 to provide a construction foundation for the embedded groove 300. After spraying, it solidifies for 24 hours, and the anti-seepage performance of the support wall 500 is improved by the third anti-seepage layer.

[0078] S2: A first groove and a second groove are formed on the first coal pillar section 100 and the second coal pillar section 200, and an embedding groove 300 is installed between the first coal pillar section 100 and the second coal pillar section 200 to ensure the stability of the artificial dam.

[0079] S3: Figure 2 As shown, a steel mesh is laid into the embedding groove 300, as shown in FIG. Figure 3 As shown, a template 03 is set up at the opening 301 of the embedding groove 300, as shown in FIG. Figure 4 As shown, grouting is performed to form the artificial segment 400, and the grouting pressure is 2 to 3 MPa to complete the pouring of the artificial segment 400.

[0080] S4: Figure 5 As shown, after the artificial segment 400 solidifies and takes shape, the template 03 is removed, and an anti-seepage material is sprayed on the side of the artificial segment 400 facing the reservoir to form a first anti-seepage layer 410. After spraying, solidification takes 24 hours to ensure that the first anti-seepage layer 410 is formed.

[0081] Specifically, before grouting into the embedded groove 300, the construction method further includes: spraying an anti-seepage material on the inner wall of the embedded groove 300, the top plate 01 of the coal mine rock layer, and the bottom plate 02 of the coal mine rock layer to form a second anti-seepage layer. By spraying the second anti-seepage layer, the anti-seepage performance between the artificial section 400 and the embedded groove 300 can be effectively provided.

[0082] Furthermore, before setting up the template 03 at the opening 301 of the embedding groove 300, the construction method further includes: setting a grouting conduit 04 on the top plate 01, the bottom plate 02, the first coal pillar section 100 and the second coal pillar section 200, and the position of the grouting conduit 04 is as follows: Figure 6 and Figure 7 As shown, the artificial section 400 is formed by grouting into the embedded groove 300 through the grouting conduit 04. After spraying the first impermeable layer 410, the construction method further includes: injecting the impermeable material through the grouting conduit 04. Through the above arrangement, the grouting conduit 04 set when the artificial section 400 is grout-formed can be used to continue injecting the impermeable material between the artificial section 400 and the embedded groove 300, thereby improving the density of the second impermeable layer, further improving the impermeable effect of the coal mine underground reservoir dam body, and ensuring the service life of the coal mine underground reservoir dam body.

[0083] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0084] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0085] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0086] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0087] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-seepage material, characterized in that: By weight percentage, the anti-seepage material includes: Matrix - 58.66wt% to 60.53wt%; Matrix II 1.87wt%~3.74wt%; Water reducing agent 0.16wt%~0.25wt%; Water 36.66wt%~37.44wt%; Wherein, the matrix 1 comprises cement, fly ash and silica fume in a mass ratio of (1-1.2):(0.4-0.5):(0.15-0.2); The second substrate comprises silicon dioxide, aluminum oxide and titanium dioxide in a mass ratio of (0.3-0.35):(1-1.1):(0.05-0.1).

2. The anti-seepage material according to claim 1, characterized in that: In the matrix 1, the particle size of the cement is ≥500 mesh.

3. The anti-seepage material according to claim 1, characterized in that: The fly ash is Class I fly ash, and the water reducer is a lignin sulfonate water reducer, a sulfonate water reducer, a melamine water reducer or a polycarboxylic acid water reducer.

4. A method for preparing an anti-seepage material, wherein the anti-seepage material is the anti-seepage material according to any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: Mix cement, fly ash and silica fume according to a mass ratio and stir evenly to obtain a matrix 1; Mix silicon dioxide, aluminum oxide and titanium dioxide according to a mass ratio and stir evenly to obtain a substrate 2; Water is added to the matrix one according to a mass ratio, and the matrix three is obtained by stirring. The matrix two and a water reducing agent are added to the matrix three according to a mass ratio to obtain the anti-seepage material.

5. A dam body of an underground reservoir in a coal mine, characterized in that: The coal mine underground reservoir dam body comprises: A first coal pillar section (100) and a second coal pillar section (200), wherein the first coal pillar section (100) and the second coal pillar section (200) are arranged at intervals in the horizontal direction, and there is an interval between the first coal pillar section (100) and the second coal pillar section (200), and a first groove is arranged on the side wall of the first coal pillar section (100) facing the second coal pillar section (200), and a second groove is arranged on the side wall of the second coal pillar section (200) facing the first coal pillar section (100); An embedding groove (300), the embedding groove (300) being arranged at the interval, the embedding groove (300) having an opening (301), the opening (301) being arranged toward the water reservoir, the side wall of the embedding groove (300) having a first protruding portion (310) and a second protruding portion (320) being arranged opposite to each other, the first protruding portion (310) extending into the first groove, and the second protruding portion (320) extending into the second groove; An artificial segment (400), wherein the artificial segment (400) is filled in the embedding groove (300), and a first impermeable layer (410) is provided on the surface of the artificial segment (400) facing the reservoir, wherein the first impermeable layer (410) is made of the impermeable material described in any one of claims 1 to 4.

6. The coal mine underground reservoir dam according to claim 5, characterized in that: A second anti-seepage layer is provided between the artificial section (400) and the inner wall of the embedded groove (300), between the artificial section (400) and the top plate (01) of the coal mine rock formation, and between the artificial section (400) and the bottom plate (02) of the coal mine rock formation, and the second anti-seepage layer is made of the anti-seepage material according to claim 1.

7. The coal mine underground reservoir dam according to claim 5, characterized in that: A supporting wall (500) is arranged on the side of the embedded groove (300) facing away from the reservoir, and a third anti-seepage layer is arranged between the supporting wall (500) and the embedded groove (300), and the third anti-seepage layer is made of the anti-seepage material according to claim 1.

8. A method for constructing a dam body of an underground reservoir in a coal mine, characterized in that: The coal mine underground reservoir dam body is the coal mine underground reservoir dam body according to claim 6, and the construction method comprises: A first groove and a second groove are provided on the first coal pillar section (100) and the second coal pillar section (200), and an embedding groove (300) is installed between the first coal pillar section (100) and the second coal pillar section (200); Setting up a template (03) at the opening (301) of the embedding groove (300), and injecting grout into the embedding groove (300) to form an artificial segment (400); The template (03) is removed, and an anti-seepage material is sprayed on the side of the artificial section (400) facing the reservoir to form a first anti-seepage layer (410).

9. The construction method according to claim 8, characterized in that: Before grouting into the embedding groove (300), the construction method further comprises: The sprayed anti-seepage material forms a second anti-seepage layer on the inner wall of the embedding groove (300), the top plate (01) of the coal mine rock layer, and the bottom plate (02) of the coal mine rock layer.

10. The construction method according to claim 8, characterized in that: Before setting up the template (03) at the opening (301) of the embedding groove (300), the construction method further comprises: arranging a grouting conduit (04) on the roof (01) of the coal mine rock formation, the bottom plate (02) of the coal mine rock formation, the first coal pillar section (100) and the second coal pillar section (200), and injecting grout into the embedding groove (300) through the grouting conduit (04) to form the artificial section (400); After spraying the first anti-seepage layer (410), the construction method further comprises: injecting the anti-seepage material through the grouting conduit (04).

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