Water seepage prevention structure for steep slope of surface mine

Abstract

The utility model provides an anti-seepage structure for a steep slope of a surface mine, which is characterized in that a plurality of grouting pipes extend downwards along an excavation slope surface of a raw ore heap, the plurality of grouting pipes are uniformly distributed in the extension direction of the excavation slope surface, and seepage slurry of any two adjacent grouting pipes intersects to form a waterproof curtain; the cement soil is stacked on the outer side of the excavated slope surface to form a newly stacked seepage interception dam, and a plurality of geogrids distributed at intervals in the longitudinal direction are arranged in the cement soil; a stacking slope is formed on the outer side of the cement soil through surface brushing, and the guniting layer is sprayed on the outer side of the stacking slope. A grouting pipe is arranged between an original ore heap excavation slope surface of the seepage interception dam and a newly-stacked tailing dam, and a waterproof curtain is formed by grouting, so that a new seepage interception dam is formed, and the waterproof performance of the seepage interception dam is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of mine tailings seepage prevention and repair, and particularly relates to an open-pit mine steep slope seepage prevention structure. BACKGROUND

[0002] In the process of mineral exploitation, the stability of the mine heap slope directly affects production safety and ecological environment. The existing mine heap is generally designed to have a seepage interception dam for seepage prevention, and the seepage prevention structure of the seepage interception dam is mostly a seepage prevention geomembrane. The seepage interception dam is generally constructed gradually with the accumulation of tailings. During the accumulation process, the seepage prevention geomembrane is subjected to soil pressure and is pulled and stretched. The seepage prevention geomembrane is prone to have a problem of poor sealing at the joint, resulting in an unsatisfactory seepage prevention effect. Since the seepage prevention geomembrane needs to be laid in combination with the construction progress of the seepage interception dam, it is difficult to maintain the seepage prevention geomembrane after it is laid, so that the seepage interception dam is difficult to repair when it seeps.

[0003] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies of the prior art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the deficiencies of the prior art, and provides an open-pit mine steep slope seepage prevention structure.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution:

[0006] An open-pit mine steep slope seepage prevention structure comprises:

[0007] A water stop curtain, a grouting pipe extends downward along the excavation slope surface of the original mine heap, a plurality of grouting pipes are uniformly distributed in the extension direction of the excavation slope surface, and the seepage grout of any two adjacent grouting pipes intersects to form the water stop curtain;

[0008] Cement soil, the cement soil is accumulated outside the excavation slope surface to form a new accumulated seepage interception dam, and a plurality of geogrids are longitudinally and spacedly arranged in the cement soil;

[0009] A guniting layer, the outside of the cement soil forms an accumulated slope surface through brushing, and the guniting layer is sprayed outside the accumulated slope surface.

[0010] Preferably, the upper edge of the cement soil and the guniting layer is laid with geotextile on the upper surface of the mine steep slope.

[0011] Preferably, the slope of the excavation slope surface is 60°-75°;

[0012] The slope of the accumulated slope surface is 45°.

[0013] Preferably, the grouting pipe is provided with a plurality of groups of transverse grouting mechanisms which are uniformly distributed along the length direction of the grouting pipe, and each of the transverse grouting mechanisms comprises two branch pipes which respectively extend into the original ore heap and the cement soil.

[0014] Preferably, the grouting pipe comprises a plurality of sections, and any two adjacent sections of the grouting pipe are connected through a cross joint, and the two branch pipes are respectively arranged on two sides of the cross joint.

[0015] Preferably, the thickness of the sprayed layer is not less than 5 cm.

[0016] Preferably, a reinforcing bar is connected between any two adjacent grouting pipes.

[0017] Beneficial effects: The grouting pipe is arranged between the original ore heap excavation slope surface of the cut-off dam and the newly accumulated tailing dam, a water stop curtain is formed by grouting, thereby forming a new cut-off dam, and the water stopping performance of the cut-off dam is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute an improper limitation on the present application. Among them:

[0019] Fig. 1 A schematic view of the anti-seepage structure in the specific embodiment provided by the present application;

[0020] Fig. 2 A schematic view of the branch pipe installation in the specific embodiment provided by the present application.

[0021] In the drawings: 1, original ore heap; 2, water stop curtain; 3, grouting pipe; 4, newly accumulated cut-off dam; 5, sprayed layer; 6, geogrid; 7, branch pipe; 8, cross joint; 9, grouting hole. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0023] In the description of the utility model, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and do not require the utility model to be necessarily constructed and operated in a particular orientation, therefore, cannot be understood as limiting the utility model. The terms "connected", "connected" used in the utility model should be understood broadly, for example, can be fixed connection, can also be detachable connection, can be directly connected, or indirectly connected through intermediate components, and those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The utility model will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0025] As Figs. 1-2 The utility model discloses a kind of open-pit mine steep slope seepage-proof structures, mainly used to repair when seepage dam seeps, specifically, using excavator to excavate the original mine heap 1 of seepage dam, after excavation is completed, excavation slope face is formed, grouting pipe 3 is set in excavation face, cement soil is accumulated at excavation face to form new seepage dam, then grouting pipe 3 is grouted, forms water-stop curtain 2.

[0026] Seepage-proof structure includes water-stop curtain 2, cement soil, guniting layer 5, wherein, water-stop curtain 2 is formed by grouting through grouting pipe 3, grouting pipe 3 extends downward along the excavation slope face of original mine heap, length is compatible with the length of excavation slope face, multiple grouting pipes 3 are evenly distributed in the extension direction of excavation slope face, and the seepage slurry of any two adjacent grouting pipes 3 meets to form water-stop curtain 2, seepage is prevented using water-stop curtain 2, to avoid the seepage water of mine heap to seep outwards.

[0027] Cement-soil is piled up on the outside of the excavated slope to form a new seepage interception dam 4. Multiple geogrids 6 are spaced longitudinally within the cement-soil. The new seepage interception dam 4 is constructed by layering and compacting 5% cement-stabilized soil upwards, with each layer compacted to a height of 1m. The final dam 4 has a top width of 10m, a bottom width of 15m, and a height of 10m. The slope of the excavated slope is 60°-75°, which maximizes the stability of the new seepage interception dam after its construction. A 45° slope is formed by brushing the outside of the cement-soil. A shotcrete layer 5 is sprayed onto the outside of this slope. A bidirectional geogrid 6 with a strength ≥50kN / m and a longitudinal overlap width ≥30cm is laid within the cement-soil layer. It is fixed with U-shaped nails to enhance interlayer shear strength, improve interlayer bonding, and prevent cracking. The shotcrete layer 5 has a thickness of not less than 5cm, preferably 8-10cm, and incorporates a quick-setting agent and polypropylene fibers to form a high-strength protective layer.

[0028] In an optional embodiment, a geotextile is laid on the upper edge of the cement soil and the shotcrete layer 5 and the upper surface of the mine steep slope. The geotextile is a waterproof geotextile, such as a tarpaulin or a plastic film, which can prevent rainwater from seeping in, thereby reducing the seepage pressure in the mine pile and reducing the possibility of water seepage.

[0029] In an optional embodiment, to ensure the consolidation stability of the new cutoff dam 4 and the original mine pile 1, the grouting pipe 3 is provided with multiple sets of transverse grouting mechanisms evenly distributed along its length. Each transverse grouting mechanism includes two branch pipes 7 extending into the original mine pile and the cement soil, respectively, thereby forming an interlocking between the original mine pile 1 and the new cutoff dam 4. The two branch pipes 7 of the transverse grouting mechanism extend into the new cutoff dam 4 and the original mine pile 1 respectively for grouting, thereby improving the consolidation capacity and range. Multiple sets of transverse grouting mechanisms are evenly distributed along the length of the grouting pipe 3. Each set of transverse grouting mechanisms includes branch pipes 7 extending to both sides of the grouting pipe 3. The diameter of the branch pipes 7 is less than or equal to that of the grouting pipe 3. Grout outlet holes are provided on the branch pipes 7. The ends of the branch pipes 7 are closed conical structures. Generally, after the original mine pile 1 is excavated, the branch pipes 7 are inserted into the corresponding excavated slope by external force, and then the new cutoff dam is built, forming an interlocking between the cutoff dam and the original mine pile 1 through the transverse grouting mechanism.

[0030] To reduce construction difficulty, the end of the branch pipe 7 is a closed sealed end, which can be inserted into the excavation slope of the original ore pile 1 under external force.

[0031] In this embodiment, the grouting pipe 3 includes multiple sections. Any two adjacent sections of the grouting pipe 3 are connected by a cross joint 8. The two longitudinal sections of the cross joint 8 are connected by a threaded connection between the two adjacent sections of the grouting pipe 3. Two branch pipes 7 are respectively assembled on the two interfaces on both sides of the cross joint 8, so that the length of the grouting pipe 3 can be adjusted according to actual needs.

[0032] In order to improve the structural strength of the water stop curtain 2, a pull bar is connected between any two adjacent grouting pipes 3, and the pull bar can be a steel bar or a steel cable. The grouting pipe 3 is in multiple sections, and each section of the grouting pipe 3 corresponds to a pull bar.

[0033] In an optional embodiment, the upper ends of the plurality of grouting pipes 3 are connected to a connecting pipe, one end of the connecting pipe is a closed end, and the other end corresponds to the connection of the grouting pump. The connecting pipe is provided with a plurality of connecting heads corresponding to the grouting pipes 3, and a pressure pump corresponding to each grouting pipe 3 is arranged on the connecting head. The connecting head is provided with a control valve, and the grouting can be synchronized or each grouting pipe 3 can be independently grouted.

[0034] In this embodiment, the grouting pipe 3 is made of steel, and the preliminary design thickness of the curtain should be 1 m according to the actual situation on site. The relationship between the spacing (L) of the grouting pipe 3 and the slurry diffusion radius (R) is as follows:

[0035] L=2Rgcosα

[0036] In order to maximize the single-hole curtain water plugging effect, the intersection angle (α) is generally selected to be about 45°. In this case, the relationship between the spacing (L), the curtain thickness (H), and the slurry diffusion radius (R) is as follows:

[0037] L=H=2Rsin45°=1.414R

[0038] Therefore, through the above analysis and calculation, the curtain thickness is 1 m, and the slurry diffusion radius is 0.71 m. According to the slurry diffusion radius and combined with the actual situation on site, the grouting holes 9 are arranged on the branch pipes 7 and the grouting pipes 3, and the spacing of the grouting holes 9 is set to be 150-450 mm.

[0039] The water-cement ratio of the slurry is 0.7-1 (the water-cement ratio can be adjusted according to the diffusion degree on site), the design final hole grouting pressure is 2 MPa, 10%-20% of the cement quality is added to the slurry to enhance the fluidity of the cement, enhance the bonding strength of the cement, ensure the stability of the slurry, and according to the water gushing situation during drilling construction, 2%-10% of the cement quality of the quick-setting agent can be added to the slurry, and the cement strength is not less than C30.

[0040] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application is within the scope of protection of the claims of the present application.

Claims

1. A water impervious structure for steep slope of an open-pit mine, characterized by, The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine.

2. The water seepage prevention structure for steep slope of strip mine according to claim 1, characterized in that, The application relates to a cement-soil retaining wall for a high slope of a mine.

3. The water seepage prevention structure for steep slope of strip mine according to claim 1, characterized in that, The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine.

4. The water seepage prevention structure for steep slope of strip mine according to claim 1, characterized in that, The application relates to a cement-soil retaining wall for a high slope of a mine.

5. The water seepage prevention structure for steep slope of strip mine according to claim 4, characterized in that, The application relates to a cement-soil retaining wall for a high slope of a mine.

6. The water seepage prevention structure for steep slope of strip mine according to claim 1, characterized in that, The application relates to a cement-soil retaining wall for a high slope of a mine.

7. The water seepage prevention structure for steep slope of strip mine according to claim 1, characterized in that, The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall for a high slope of a mine. The application relates to a cement-soil retaining wall

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