A construction method for the seepage drainage wall of a tailings dam

Abstract

The present invention relates to the technical field of the seepage drainage system of tailings ponds in metal and non-metal mines, and specifically relates to a construction method for a seepage drainage wall of a tailings dam, which includes the following steps: Step 1, section division; Step 2, construction of the seepage drainage wall in the first section; Step 3, construction of the seepage drainage wall in the second section; Step 3, construction of the seepage drainage walls in the third and fourth sections; Step 4, construction of the seepage drainage walls in other remaining sections; Compared with the prior art, the construction method for a seepage drainage wall of a tailings dam provided by the present invention can be safe, efficient, simple in method and easy to operate, can accelerate the construction progress of the seepage drainage wall, quickly reduce the phreatic line inside the dam body, and ensure the seepage stability of the tailings dam.

Description

Technical Field

[0001] The present invention relates to the technical field of seepage drainage systems for tailing ponds in metal and non-metal mines, and specifically to a construction method for seepage drainage walls of tailing dams. Background Art

[0002] The phreatic line, as the lifeline of the tailing dam, is the most direct and crucial factor affecting the safety of the tailing stacking dam. As the stacking height of the tailing dam continuously increases, the buried depth of the phreatic line inside the tailing dam body gradually rises. Once the phreatic line inside the tailing dam body is higher than the controlled buried depth of the phreatic line, seepage reduction measures should be immediately taken.

[0003] Currently, the common types of seepage drainage facilities in tailing ponds are as follows: gravity seepage drainage pipes, well point dewatering, vertical-horizontal combined seepage drainage, siphon seepage drainage, radiation wells, etc. Among them, the seepage drainage wall in the vertical-horizontal combined seepage drainage system is relatively commonly used, with relatively simple construction, lower investment, and better seepage drainage effect. By reasonable layout, it can effectively reduce the phreatic line inside the dam body and ensure the seepage stability of the tailing pond.

[0004] At present, there are generally two construction processes for seepage drainage walls. One is to form a seepage drainage wall with a relatively shallow depth (excavation depth less than 6m) through excavation, and the other is to form a seepage drainage wall with a relatively deep depth (drilling depth greater than 6m) through drilling. For the seepage drainage wall formed by excavation, it is necessary to first excavate a groove on the tailing sand platform outside the tailing pond according to the planned position, and then lay geotextiles and backfill crushed stone materials. To ensure construction safety, the side slopes on both sides of the bottom of the groove usually slope at a ratio of 1:1.5 to 1:2 to both sides during the excavation process, or timely take support measures after excavation to prevent water gushing or landslides on both side slopes.

[0005] During the construction process of the seepage drainage wall, it is often encountered that the width of the tailing sand platform is too narrow to meet the slope requirement, or the axis of the tailing dam is too long, which requires a large cost for pit and groove support. How to safely, quickly and efficiently complete the construction of the seepage drainage wall under the above limiting conditions, and quickly reduce the phreatic line inside the dam body to ensure the seepage stability of the tailing dam is a practical problem.

[0006] In view of this, the present invention is specifically proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a construction method for seepage drainage walls of tailing dams, which can safely, quickly and efficiently complete the construction of seepage drainage walls.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A construction method for seepage drainage walls of tailing dams includes the following steps:

[0010] Step 1, section division;

[0011] The tailings dam is divided into sections, namely the first section, the second section... up to the Nth section;

[0012] Step 2, construct the drainage wall for the first section;

[0013] Excavate the first section. After excavating to the given elevation, place the first group of bottomless caissons into the excavated trench in sequence from bottom to top. After the placement of the first group of bottomless caissons is completed, lay geotextiles along the inner side of the caissons, and then put gravel into the caissons;

[0014] Step 3, construct the drainage wall for the second section;

[0015] Excavate the second section. After excavating to the given elevation, place the second group of bottomless caissons into the excavated trench in sequence from bottom to top. After the placement of the second group of bottomless caissons is completed, lay geotextiles along the inner side of the caissons, and then put gravel into the caissons;

[0016] Step 3, construct the drainage walls for the third section and the fourth section;

[0017] Excavate the third section. After excavating to the given elevation, lift the first group of bottomless caissons from the first section and place them into the trench excavated in the third section. After the placement is completed, complete the geotextile laying and gravel filling with reference to Step 2;

[0018] Excavate the fourth section. After excavating to the given elevation, lift the second group of bottomless caissons from the second section and place them into the trench excavated in the fourth section. After the placement is completed, complete the geotextile laying and gravel filling with reference to Step 3;

[0019] Step 4, construct the drainage walls for the remaining other sections;

[0020] Excavate the remaining other sections in sequence and alternately use the first group of bottomless caissons and the second group of bottomless caissons, and complete the geotextile laying and gravel filling.

[0021] Preferably, a female card slot is provided at the bottom of the bottomless caisson, and a male card slot matching the female card slot at the bottom is provided at the top of the bottomless caisson.

[0022] Preferably, the male card slot and the female card slot are set as a circular arch straight wall type.

[0023] Preferably, rotatable lifting rings are welded at the four corner points at the top of the bottomless caisson.

[0024] Preferably, the height of the bottomless caisson is 1 m to 2 m, the length is 2 m to 4 m, and the width is 1 m to 2 m.

[0025] Preferably, the depth of the drainage wall is less than 6 m.

[0026] Preferably, in Step 1:

[0027] The first section, the second section... to the Nth section are sequentially distributed along the axis direction of the tailings dam.

[0028] Preferably, in the third step:

[0029] The construction of the drainage walls in the third section and the fourth section is carried out simultaneously.

[0030] Compared with the prior art, a construction method for a drainage wall of a tailings dam provided by the present invention is safe, efficient, simple in method, easy to operate, can accelerate the construction progress of the drainage wall, quickly lower the phreatic line inside the dam body, and ensure the seepage stability of the tailings dam.

[0031] To make the above objects, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of a bottomless caisson in a construction method for a drainage wall of a tailings dam provided by an embodiment of the present invention.

[0034] Figure 2 It is a schematic structural diagram of a bottomless caisson in a construction method for a drainage wall of a tailings dam provided by another embodiment of the present invention.

[0035] Figure 3 It is a process structure diagram of the construction of the drainage wall in the first section in a construction method for a drainage wall of a tailings dam provided by an embodiment of the present invention.

[0036] Figure 4 It is a process structure diagram of the construction of the drainage wall in the second section in a construction method for a drainage wall of a tailings dam provided by an embodiment of the present invention.

[0037] Figure 5 It is a process structure diagram of the construction of the drainage wall in the third section in a construction method for a drainage wall of a tailings dam provided by an embodiment of the present invention.

[0038] Figure 6 It is a process structure diagram of the construction of the drainage wall in the fourth section in a construction method for a drainage wall of a tailings dam provided by an embodiment of the present invention.

[0039] Figure 7It is a process structure diagram for the construction of the seepage control wall in the fifth section in the construction method of the seepage control wall for the tailings dam provided by the embodiment of the present invention.

[0040] As shown in the figure:

[0041] 1. Bottomless caisson; 2. Hoisting ring; 3. Card slot; 4. Tailings sand; 5. Top surface line of the tailings sand platform; 6. First caisson; 7. Second caisson; 8. Geotextile; 9. Crushed stone; 10. Third caisson; 11. Fourth caisson; D1. First section seepage control wall; D2. Second section seepage control wall; D3. Third section seepage control wall; D4. Fourth section seepage control wall; D5. Fifth section seepage control wall. Specific implementation mode

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present invention.

[0043] The embodiment of the present invention provides a construction method for the seepage control wall of a tailings dam, including the following steps:

[0044] A construction method for the seepage control wall of a tailings dam, including the following steps:

[0045] Step 1, section division;

[0046] The tailings dam is divided into sections, divided into the first section, the second section... to the Nth section;

[0047] Step 2, construction of the first section seepage control wall D1;

[0048] The first section is excavated. After excavating to the given elevation, the first group of bottomless caissons 1 are sequentially placed into the excavated trench from bottom to top. After the placement of the first group of bottomless caissons is completed, geotextile 8 is laid along the inner side of the caisson, and then crushed stone 9 is put into the caisson;

[0049] In a preferred embodiment of the present invention, the first section, the second section... to the Nth section are sequentially distributed along the dam axis direction of the tailings dam.

[0050] Such as Figure 3As shown, in one embodiment of the present invention, a first caisson 6 and a second caisson 7 are provided, with the first caisson 6 at the lower part and the second caisson 7 at the upper part. The two ends of the first section seepage drainage wall D1 are tailings sand 4, and the top surface line of the tailings platform at the top of the first section seepage drainage wall D1.

[0051] Step 3, construct the second section seepage drainage wall D2;

[0052] Excavate the second section. After excavating to the given elevation, place the second group of bottomless caissons 1 into the excavated trench in sequence from bottom to top. After the placement of the second group of bottomless caissons 1 is completed, lay geotextiles 8 along the inner side of the caissons, and then put crushed stone materials 9 into the caissons;

[0053] As Figure 4 shown, in one embodiment of the present invention, a third caisson 10 and a fourth caisson 11 are provided, with the third caisson 10 at the lower part and the fourth caisson 11 at the upper part.

[0054] Step 3, construct the third section seepage drainage wall D3 and the fourth section seepage drainage wall D4;

[0055] Excavate the third section. After excavating to the given elevation, lift the first group of bottomless caissons 1 from the first section and place them into the trench excavated in the third section. After the placement is completed, complete the laying of geotextiles 8 and the filling of crushed stone materials 9 with reference to Step 2;

[0056] As Figure 5 shown, in one embodiment of the present invention, lift the first caisson 6 and the second caisson 7 and place them into the third section, with the second caisson 7 at the lower part and the first caisson 6 at the upper part.

[0057] Excavate the fourth section. After excavating to the given elevation, lift the second group of bottomless caissons from the second section and place them into the trench excavated in the fourth section. After the placement is completed, complete the laying of geotextiles 8 and the filling of crushed stone materials 9 with reference to Step 3;

[0058] In a preferred embodiment of the present invention, the construction of the seepage drainage walls in the third section and the fourth section is carried out simultaneously.

[0059] As Figure 6 shown, in one embodiment of the present invention, lift the third caisson 10 and the fourth caisson 11 and place them into the fourth section, with the fourth caisson 11 at the lower part and the third caisson 10 at the upper part.

[0060] Step 4, construct the seepage drainage walls in other remaining sections;

[0061] Excavate the other remaining sections in sequence and alternately use the first group of bottomless caissons and the second group of bottomless caissons, and complete the laying of geotextiles and the filling of crushed stone materials.

[0062] As Figure 7As shown, in an embodiment of the present invention, the first caisson 6 and the second caisson 7 are hoisted and placed on the drainage wall D5 in the fifth section, where the first caisson 6 is at the lower part and the second caisson 7 is at the upper part.

[0063] As Figure 1-2 As shown, a female card slot 3 is provided at the bottom of the bottomless caisson 1, and a male card slot 3 matching the female card slot 3 at the bottom is provided at the top of the bottomless caisson 1. In a preferred embodiment of the present invention, the male card slot and the female card slot are arranged in a circular arch straight wall type. In addition, rotatable lifting rings 2 are welded at the four corner points at the top of the bottomless caisson 1. The height of the bottomless caisson 1 is 1 m to 2 m, the length is 2 m to 4 m, and the width is 1 m to 2 m. The depth of the drainage wall is less than 6 m.

[0064] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0065] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0066] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0067] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A construction method for a seepage drainage wall of a tailings dam, characterized in that, It includes the following steps: Step 1, section division; The tailings dam is sectioned into the first section, the second section... up to the Nth section; Step 2, construction of the drainage wall in the first section; The first section is excavated. After excavating to the given elevation, the first group of bottomless caissons are sequentially placed into the excavated trench from bottom to top. After the first group of bottomless caissons are placed, geotextiles are laid along the inner side of the caissons, and then crushed stone materials are put into the caissons; Step 3, construction of the drainage wall in the second section; The second section is excavated. After excavating to the given elevation, the second group of bottomless caissons are sequentially placed into the excavated trench from bottom to top. After the second group of bottomless caissons are placed, geotextiles are laid along the inner side of the caissons, and then crushed stone materials are put into the caissons; Step 3, construction of the drainage walls in the third section and the fourth section; The third section is excavated. After excavating to the given elevation, the first group of bottomless caissons are hoisted from the first section and placed into the trench excavated in the third section. After placement, the laying of geotextiles and the filling of crushed stone materials are completed with reference to Step 2; The fourth section is excavated. After excavating to the given elevation, the second group of bottomless caissons are hoisted from the second section and placed into the trench excavated in the fourth section. After placement, the laying of geotextiles and the filling of crushed stone materials are completed with reference to Step 3; Step 4, construction of the drainage walls in other remaining sections; The other remaining sections are excavated in sequence and the first group of bottomless caissons and the second group of bottomless caissons are used alternately, and the laying of geotextiles and the filling of crushed stone materials are completed.

2. The construction method of a seepage drainage wall for a tailings dam according to claim 1, characterized in that, A female card slot is provided at the bottom of the bottomless caisson, and a male card slot matching the female card slot at the bottom is provided at the top of the bottomless caisson.

3. A construction method for a drainage wall of a tailings dam according to claim 2, characterized in that, The male card slot and the female card slot are set as an arch straight wall type.

4. A construction method of a seepage drainage wall for a tailings dam according to claim 3, characterized in that, Rotatable lifting rings are welded at the four corner points at the top of the bottomless caisson.

5. A construction method of a seepage drainage wall for a tailings dam according to claim 4, characterized in that, The height of the bottomless caisson is 1m to 2m, the length is 2m to 4m, and the width is 1m to 2m.

6. A construction method for a seepage drainage wall of a tailings dam according to claim 5, characterized in that, The depth of the drainage wall is less than 6m.

7. A construction method for a seepage drainage wall of a tailings dam according to claim 6, characterized in that, In Step 1: The first section, the second section... up to the Nth section are sequentially distributed along the dam axis direction of the tailings dam.

8. A construction method for a seepage drainage wall of a tailings dam according to claim 7, characterized in that, In Step 3: The construction of the drainage walls in the third section and the fourth section is carried out simultaneously.

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