Strip mine landslide treatment method

Abstract

The invention discloses a strip mine landslide treatment method which comprises the following steps: S01, detecting a landslide boundary, and dividing a safety range area outside the landslide boundary; s02, multiple rows of freezing drill holes are constructed in the landslide area and the safety range area in the preset direction, and the lower ends of the freezing drill holes are drilled to the preset depth of a base layer; s03, a freezing pipe is arranged in each freezing drill hole, and the lower end of each freezing pipe reaches the hole bottom of the corresponding freezing drill hole; s04, a freezing liquid supply device is arranged on the end slope of the strip mine, and the freezing liquid supply device is connected with each freezing pipe through a liquid supply pipe; s05, freezing liquid is injected into the freezing pipe, and after the freezing pipe is filled with the freezing liquid, the machine is stopped; s06, after standing is conducted for preset time, landslide rock soil in the landslide area is frozen, and the landslide rock soil, the base layer and the freezing pipe are frozen together; and S07, stoping and / or slope pressing operation are / is carried out.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landslide treatment, in particular to a method for treating landslide of open-pit mine. BACKGROUND

[0002] After the landslide of open-pit mine slope, the impact mainly has the following two kinds: The first kind is that the landslide rock-soil buries the bottom layer of the mine, which affects the mining of mineral resources.

[0003] The second kind is that the landslide rock-soil fills the mine pit, directly burying the working face or occupying the space of the equipment at the bottom of the pit.

[0004] The traditional method for treating landslide is to remove the landslide rock-soil layer by layer from top to bottom, prepare space, and press the mine after the landslide rock-soil tends to be stable. However, due to the long time for the landslide rock-soil to reach stress balance, the slope usually takes a long time to be completely stable after the landslide occurs, especially when the landslide rock-soil contains a large amount of water, which is prone to secondary landslide, making the disposal more difficult, which seriously affects the re-arrangement of the mining working face and the mining plan.

[0005] Therefore, it is necessary to provide a new method for treating landslide of open-pit mine. SUMMARY

[0006] The present application aims to overcome the shortcomings of the prior art, and provides a method for treating landslide of open-pit mine, which freezes the landslide rock-soil in the landslide area by freezing, so that it is frozen together with the underlying base layer, shortening the treatment time, and the frozen pipe also plays the role of anti-slide pile, improving the overall stability of the landslide rock-soil.

[0007] The technical scheme of the present application provides a method for treating landslide of open-pit mine, comprising the following steps: S01: detecting the landslide boundary and dividing a safe range area outside the landslide boundary; S02: constructing a plurality of rows of frozen drill holes in the landslide area and the safe range area along a predetermined direction, respectively, and the lower end of the frozen drill hole is drilled to a predetermined depth of the base layer; S03: arranging one frozen pipe in each of the frozen drill holes, and the lower end of the frozen pipe reaches the bottom of the frozen drill hole; S04: arranging a frozen liquid supply device at the end of the open-pit mine, and connecting the frozen liquid supply device and each of the frozen pipes through a liquid supply pipe, respectively; S05: injecting frozen liquid into the frozen pipe, and stopping after the frozen liquid fills the frozen pipe; S06: after a predetermined time, the landslide rock-soil in the landslide area is frozen and frozen together with the base layer and the frozen pipe. S07: carrying out the stoping and / or the pressure side operation.

[0008] In one of the optional technical solutions, the step 1 further comprises: detecting the water content in the landslide soil of the landslide area; if the water content in the landslide soil is less than a preset threshold, constructing a plurality of water injection boreholes in the landslide soil; injecting water into the water injection boreholes by using a water injection device to increase the water content in the landslide soil so as to freeze the landslide soil.

[0009] In one of the optional technical solutions, the water injection boreholes are constructed downward from the top surface of the landslide soil, and the lower ends of the water injection boreholes reach the bottom of the landslide soil.

[0010] In one of the optional technical solutions, the water injection boreholes are constructed in the landslide soil from the side surface of the landslide soil, and the water injection boreholes are horizontally arranged and located at the bottom of the landslide soil.

[0011] In one of the optional technical solutions, water is injected into the water injection boreholes before the freezing liquid is injected into the freezing pipes.

[0012] In one of the optional technical solutions, water is injected into the water injection boreholes at the same time when the freezing liquid is injected into the freezing pipes.

[0013] In one of the optional technical solutions, the plurality of freezing boreholes and the plurality of water injection boreholes are divided into zones, and the freezing liquid and the water are injected into the zones in a preset order until the freezing of the landslide soil of the entire landslide area is completed.

[0014] In one of the optional technical solutions, a plurality of the freezing boreholes are obliquely and / or horizontally drilled in the landslide soil from the side surface of the landslide area, and the freezing pipes are arranged in the freezing boreholes.

[0015] In one of the optional technical solutions, the freezing pipes are sequentially recovered in advance when the stoping operation is carried out.

[0016] In one of the optional technical solutions, the freezing pipes are double-layer stainless steel pipes, and the liquid inlet of the freezing pipes is provided with a check valve.

[0017] The above technical solution has the following beneficial effects: The open-pit mine landslide treatment method provided by the present application freezes the landslide rock-soil by injecting freezing liquid into the freezing pipes, the bottom surface of the landslide rock-soil is frozen together with the base layer, and the landslide rock-soil is also frozen together with the freezing pipes, the mechanical balance of the landslide body is accelerated, the treatment time is shortened, the freezing pipes play the role of anti-slide piles, and the stability of the whole landslide rock-soil is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The disclosure of the present application will become more apparent from the following description taken in conjunction with the accompanying drawings. It is to be understood that the drawings are for purposes of illustration only and are not intended to limit the scope of the present application. In the drawings: Figure 1 The schematic diagram of the open-pit mine landslide treatment method provided by an embodiment of the present application, wherein the landslide belongs to the landslide body pressing the ore situation; Figure 2 The schematic diagram of the safety range area divided outside the landslide boundary; Figure 3 The schematic diagram of the recovery or stoping after the freezing of the landslide rock-soil in the landslide body pressing the ore situation; Figure 4 The schematic diagram of the open-pit mine landslide treatment method provided by another embodiment of the present application, wherein the landslide belongs to the landslide body occupying the situation. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings. The same parts are denoted by the same reference numerals in the drawings. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0020] As shown in the drawings, the open-pit mine landslide treatment method provided by an embodiment of the present application comprises the following steps: Figures 1-4 S01: Detect the landslide boundary and divide a safety range area outside the landslide boundary. S02: Construct multiple rows of freezing drill holes in the landslide area 5 and the safety range area along a preset direction respectively, and drill the lower end of the freezing drill holes to a preset depth of the base layer 2.

[0021] S03: Arrange one freezing pipe 6 in each freezing drill hole, and the lower end of the freezing pipe 6 reaches the hole bottom of the freezing drill hole.

[0022] S04: Arrange a freezing liquid supply device 7 at the end of the open-pit mine, and connect the freezing liquid supply device 7 and each freezing pipe 6 by a liquid supply pipe respectively.

[0023] S04: Arrange a freezing liquid supply device 7 at the end of the open-pit mine, and connect the freezing liquid supply device 7 and each freezing pipe 6 by a liquid supply pipe respectively.

[0024] S05: Inject freezing liquid into the freezing pipe 6, and stop after the freezing liquid fills the freezing pipe 6.

[0025] S06: After standing for a preset time, the landslide rock-soil of the landslide area 5 is frozen and frozen together with the base layer 2 and the freezing pipe 6.

[0026] S07: Perform backfilling and / or pressure support operation.

[0027] The open-pit mine landslide treatment method provided by the present application is mainly used for treating the landslide problem of the open-pit mine, and the landslide rock-soil formed by the landslide can be referred to as a landslide mass.

[0028] The periphery of the open-pit mine is the end slope 1, and the inner side of the bottom of the end slope 1 is the base layer 2 or the bottom layer. Generally, the stratum 3 (for example, the coal seam) above the base layer 2 is the stratum 3 (for example, the coal seam), and the stratum 4 above the stratum 3 is the stratum 4.

[0029] Figures 1-3 The illustrated landslide situation is a landslide mass pressure mining situation, mainly caused by the landslide of the end slope 1. The landslide rock-soil of the landslide area 5 is pressed on the stratum 3 and the stratum 4, and the treatment method mainly includes steps such as freezing of the landslide rock-soil, recovery preparation, backfilling, and pressure support.

[0030] Figure 1 The middle arrow A represents that the landslide rock-soil of the landslide area 5 is obliquely downwardly moved from the top of the end slope 1. The initial profile of the landslide rock-soil is approximately indicated by the dashed line in the figure. Figure 1 The profile of the landslide area 5 after the landslide forms a stepped or undulating shape. Figure 3 The dashed line B in the figure approximately represents a safety line outside the boundary of the landslide area 5. The area inside the safety line (the left side of the dashed line B) needs to be frozen and reinforced. In the landslide mass pressure mining situation, the stratum 3 below needs to be mined. A mining step 8 is constructed in stages, the freezing pipe 6 on the mining step 8 is withdrawn, the rock-soil above is stripped, and then the stratum 3 is excavated and mined. The stripped material is discharged and used for pressure support in the process of backfilling.

[0031] Figure 4 The illustrated landslide situation is a landslide mass occupation situation, mainly caused by the landslide of the internal discharge site and other non-working slopes. Since the landslide rock-soil of the landslide area 5 hardly presses the mine, the landslide rock-soil does not exist or exists less in the case of excavation and movement, and therefore the treatment method mainly includes steps such as freezing of the landslide rock-soil, shaping, and pressure support disposal.

[0032] After the landslide rock-soil is frozen into a frozen soil pile, a soil retaining dam 10 with a height of 2-3 m is constructed on the side of the frozen soil pile close to the open-pit mine stope 9 to block the rock above from sliding into the open-pit mine stope 9. When the advancing distance of the open-pit mine stope 9 reaches a distance until the open-pit mine can start internal discharge or other reasons cause the open-pit mine pit space to be fully released, the freezing pipe 6 is gradually withdrawn from the end of the landslide rock-soil, and the stripped material is used for pressure support disposal.

[0033] The open-pit landslide treatment method provided by the application mainly comprises the following steps: First step: first, the landslide boundary is detected by means of geophysical prospecting and drilling, and a safety range area is divided outside the landslide boundary. Most of the safety range area is in the end slope 1, and a small part of the safety range area is outside the end slope 1.

[0034] Second step: a plurality of rows of frozen drill holes are respectively constructed in the landslide area 5 and the safety range area. The trend of the frozen drill holes is preferably along the landslide direction and the non-working slope trend of the open-pit mine. The lower end of the frozen drill hole is drilled to a preset depth of the base layer 2, for example, 3-5 m below the interface between the base layer 2 and the ore bed 3 and the rock bed 4.

[0035] Third step: then, a frozen pipe 6 is arranged in each frozen drill hole. The length of the frozen pipe 6 is greater than the depth of the frozen drill hole, and the lower end of the frozen pipe 6 is closed and reaches the bottom of the frozen drill hole. The upper end of the frozen pipe 6 is provided with a plug cap and a check valve.

[0036] Fourth step: a frozen liquid supply device 7 is arranged on the end slope of the open-pit mine, including a pump, a compressor, a frozen liquid tank and the like. The frozen liquid can be low-temperature brine, liquid nitrogen and the like. The frozen liquid supply device 7 is connected with each frozen pipe 6 through a liquid supply pipe.

[0037] Specific arrangement mode: a main pipe is connected with the frozen liquid supply device 7, and then a branch pipe is connected with the main pipe for each row of frozen pipes 6. Each frozen pipe 6 in each row is connected with the branch pipe through a connecting pipe. According to needs, a multi-way valve can be arranged at the pipe connection, and an electromagnetic valve is arranged in the connecting pipe, for controlling the on-off of the supply of the frozen liquid to the frozen pipe 6.

[0038] Fifth step: the frozen liquid is injected into the frozen pipe 6, and the machine is stopped after the frozen liquid fills the frozen pipe 6. Specifically, a pressure valve can be arranged at the pipe opening of the frozen pipe 6, and the pressure valve and the electromagnetic valve are respectively connected with a control system through wires. When it is monitored that the pressure in the frozen pipe 6 reaches a preset value, it indicates that the frozen pipe 6 is filled with the frozen liquid, and the electromagnetic valve is automatically closed to stop the supply of the frozen liquid to the frozen pipe 6.

[0039] Sixth step: after a preset time, the specific time can be selected according to needs, until the landslide rock-soil in the landslide area 5 is frozen. At this time, the landslide rock-soil is frozen together with the base layer 2, the ore bed 3, the rock bed 4 and the frozen pipe 6 and the like. The frozen pipe 6 plays a role of anti-slide pile, and improves the overall stability of the landslide rock-soil.

[0040] Seventh step: according to needs, the back mining and / or slope pressing operation is performed.

[0041] In summary, the open-pit mine landslide treatment method provided by the present application constructs multiple rows of frozen drill holes and embeds frozen pipes 6 in the landslide area 5 and the safety range area, freezes the landslide rock-soil by injecting freezing liquid into the frozen pipes 6, freezes the bottom surface of the landslide rock-soil together with the base layer 2, and also freezes the bottom surface of the landslide rock-soil together with the frozen pipes 6, accelerates the realization of mechanical balance of the sliding body, shortens the treatment time, and plays the role of anti-slide pile for the frozen pipes 6, thereby improving the overall stability of the landslide rock-soil.

[0042] In one of the embodiments, step 1 further comprises: Detecting the water content in the landslide rock-soil of the landslide area 5.

[0043] If the water content in the landslide rock-soil is less than a preset threshold, multiple water injection drill holes are constructed in the landslide rock-soil.

[0044] Water is injected into the water injection drill holes by using a water injection device to increase the water content in the landslide rock-soil so as to freeze the landslide rock-soil.

[0045] When the water content in the landslide rock-soil is less, and the freezing difficulty is great, water is preferably injected into the landslide rock-soil for subsequent freezing. A plurality of water injection drill holes can be drilled in the landslide rock-soil in advance, and then an appropriate amount of water is injected into the water injection drill holes. After the freezing liquid is injected into the surrounding frozen pipes 6, the landslide rock-soil is naturally frozen together by the water.

[0046] In one of the embodiments, the water injection drill holes are constructed downward from the top surface of the landslide rock-soil, and the lower ends of the water injection drill holes reach the bottom of the landslide rock-soil, so as to ensure that there is water in the landslide rock-soil from top to bottom for freezing.

[0047] In one of the embodiments, the water injection drill holes are constructed in the landslide rock-soil from the side surface of the landslide rock-soil, and the water injection drill holes are horizontally arranged and located at the bottom of the landslide rock-soil, so as to ensure that there is sufficient water in the bottom of the landslide rock-soil to freeze and connect with the base layer 2, the ore layer 3, the rock layer 4, and the like below, thereby improving the freezing effect.

[0048] In one of the embodiments, water is injected into the water injection drill holes before the freezing liquid is injected into the frozen pipes 6, so as to ensure that there is an appropriate amount of water in the landslide rock-soil for freezing before freezing.

[0049] In one of the embodiments, water is injected into the water injection drill holes at the same time when the freezing liquid is injected into the frozen pipes 6. In this way, the water can be quickly frozen after being injected, and the water loss can be avoided.

[0050] In one of the embodiments, the multiple rows of frozen holes and the multiple rows of water injection holes are divided into zones, and the freezing liquid and the water are injected into the zones in a preset order until the freezing of the landslide rock-soil in the entire landslide area 5 is completed.

[0051] The water and freezing liquid are injected in the way of zoning and segmenting, which can reduce the power of the pump and facilitate the orderly work until the whole landslide rock-soil is frozen, and improve the freezing effect.

[0052] In one of the embodiments, a plurality of freezing drill holes are drilled in the landslide rock-soil from the side of the landslide area 5 obliquely and horizontally, and the freezing pipes 6 are arranged in the freezing drill holes, which further improve the freezing effect.

[0053] When the top surface of the landslide area 5 does not have the operation conditions of drilling vertical holes, the drilling from the side of the landslide area 5 can also be used.

[0054] In one of the embodiments, the freezing pipes 6 are recovered in advance and sequentially during the mining operation, which can avoid waste and damage to the mining equipment caused by the freezing pipes 6. When the freezing pipes 6 are recovered, the freezing pipes 6 can be pulled out by a crane.

[0055] In one of the embodiments, the freezing pipes 6 are made of double-layer stainless steel pipes, which have high structural strength and are not easy to be damaged. The liquid inlet of the freezing pipe 6 is provided with a check valve to prevent the freezing liquid from overflowing from the freezing pipe 6.

[0056] The treatment method of the landslide pressure mining is as follows: As shown in Figures 1-3 , the landslide pressure mining is mainly caused by the end slope 1, and the treatment method mainly includes the steps of landslide rock-soil freezing, recovery preparation, and mining pressure help.

[0057] As shown in 1, the landslide rock-soil freezing: the freezing drill holes are continuously and intervally arranged along the sliding direction A and the non-working slope trend direction of the open-pit mine on the end slope 1 of the landslide area (generally including the ore bed 3 and the rock bed 4 below) and the safety range of 50-80m outside the boundary of the landslide area. The freezing drill holes are drilled downward into the top surface of the base layer 2 by a depth of 3-5m. The freezing drill holes penetrate the landslide rock-soil to the base layer 2, and the spacing of the freezing drill holes can be selected as 1.5-2m, or can be appropriately adjusted according to the mechanical properties and volume of the landslide rock-soil. The diameter of the freezing drill hole can be selected as 20-30cm. The freezing pipe 6 is installed in the freezing drill hole, and the freezing pipe 6 is connected with the freezing liquid supply equipment 7. The freezing liquid supply equipment 7 works to inject the freezing liquid into the freezing pipe 6 to exchange heat with the surrounding landslide rock-soil, freeze the surrounding landslide rock-soil, and form a frozen soil pile. At the same time, the freezing liquid in the freezing pipe 6 forms a frozen column, which forms an anti-slide pile with the freezing pipe 6 to improve the overall stability of the frozen landslide rock-soil.

[0058] As shown in Figure 2As shown, the recovery preparation: after the landslide rock and soil is frozen, along the bottom to the top direction of the landslide area, using the strength of frozen soil, the stability of the slope angle is calculated to meet the specification requirements, and the landslide area is trimmed according to the stable slope angle. Build the recovery bench 8, the parameters of the recovery bench 8 are implemented according to the mine bench parameters determined in the preliminary design, the bench width is the minimum mining width, that is, the width that meets the minimum excavation and transportation equipment operation width, generally 20-30m, the bench size should not be too large here, to avoid large area damage to the landslide area and affect the stability.

[0059] The recovery pressure: after the recovery bench 8 is built, the recovery pressure is started, and the recovery working face is arranged on the recovery bench 8 at the bottom layer position near the dump side. A recovery unit is divided every 30m along the direction of the recovery bench 8 at the bottom layer position for segmented recovery. First, the mine within the first 30m range is recovered, and when the design angle and position are reached, the recovery is stopped. Then the stripping material is quickly discharged and backfilled in the area where the mining has been completed, the minimum safety distance between the inner dump and the recovery working face is maintained, and the frozen pipe 6 within the range of the inner dump bench step is removed, thus completing the mine recovery and inner dump pressure within the first 30m range. Then, according to the above steps, the mine recovery and inner dump pressure within the second 30m range are carried out, and so on, until the mine recovery and inner dump pressure within the last range are completed.

[0060] As shown in Figure 4 The landslide occupies the position mainly in the inner dump and other non-working slope landslide, which is different from the landslide pressure mine treatment. Because the landslide occupies the position, the landslide rock and soil almost does not press the mine, so the landslide occupies the position does not exist or exists less excavation and movement, so its treatment method mainly includes the steps of landslide rock and soil freezing, landslide shaping, and pressure treatment.

[0061] Landslide rock and soil freezing: the frozen drill holes are continuously and interval set on the end slope 1 or slope outside the boundary of the landslide area within the range of 30-50m along the direction of the landslide A and the slope. The frozen drill holes are drilled into the top surface of the base layer 2, and the depth gradually increases along the top to the bottom direction of the landslide area. The depth of the frozen drill holes drilled into the top surface of the base layer 2 is controlled at 2-3m, the interval of the frozen drill holes can be selected at 1.5-2m, and the diameter can be selected at 20-30cm, of course, it can also be adjusted according to the mechanical properties and volume of the landslide rock and soil. The frozen pipe 6 is installed in the frozen drill hole, the frozen liquid supply equipment 7 works, the frozen liquid is injected into the frozen pipe 6 to exchange heat with the surrounding landslide rock and soil, the surrounding landslide rock and soil is frozen, and the frozen soil pile is formed. At the same time, the frozen liquid in the frozen pipe 6 forms a frozen column, which forms an anti-slide pile with the frozen pipe 6, and improves the overall stability of the frozen landslide rock and soil.

[0062] The frozen soil pile is artificially increased by 2-3 m on the side close to the open-pit mine stope 9 after the frozen soil pile is formed, a continuous retaining dam 10 is formed to block the rock possibly sliding from the upper side into the open-pit mine stope 9. When the open-pit mine stope 9 advances until the open-pit mine can start internal drainage or other reasons make the open-pit mine pit space fully released, the freezing pipes 6 are gradually removed from the end of the frozen soil pile, and the stripping material is used for pressure side disposal.

[0063] In the present application, the freezing pipes 6 are arranged in the freezing drill holes, the freezing pipes 6 work to freeze the landslide rock-soil and bond the interfaces of the landslide rock-soil base layer 2, the ore layer 3 and the rock layer 4 together, which is beneficial to quickly achieve the mechanical balance of the landslide rock-soil and shorten the treatment time. Meanwhile, the freezing pipes 6 play the role of anti-slide piles, which improves the overall stability of the landslide rock-soil after freezing. Different disposal steps can be implemented according to different landslide influences, which is targeted and has good landslide disposal effect. The scheme effect is better when facing the slope with high water content. The water adding mode of the landslide body can be effectively applied to the landslide situation of the open-pit mine in the northern arid area. The freezing equipment used is mature in technology and can be recycled, and the cost is controllable. The mechanical equipment used is the existing equipment of the mine, and the operation of each link is simple and efficient.

[0064] According to the needs, the above technical solutions can be combined to achieve the best technical effect.

[0065] The above is only the principle and preferred embodiment of the present application. It should be noted that for ordinary skilled in the art, on the basis of the principles of the present application, a number of other variants can also be made, which should be considered as the protection scope of the present application.

Claims

1. A method for controlling landslides in open-pit mines, characterized in that, Includes the following steps: S01: Detect the landslide boundary and delineate a safe zone outside the landslide boundary; S02: Construct multiple rows of freezing boreholes along a preset direction in the landslide area and the safe zone area respectively, with the lower end of the freezing boreholes drilled to a preset depth in the base layer; S03: Install a freezing pipe into each of the aforementioned freezing boreholes, with the lower end of the freezing pipe reaching the bottom of the freezing borehole; S04: Install a freezing liquid supply device on the end face of the open-pit mine, and connect the freezing liquid supply device to each of the freezing pipes through a liquid supply pipe. S05: Inject freezing liquid into the freezing tube, and stop the machine after the freezing liquid has filled the freezing tube; S06: After a preset time of settling, the landslide soil and rock in the landslide area freezes and freezes together with the base layer and the freezing pipe; S07: To carry out mining and / or lining operations.

2. The method for controlling landslides in open-pit mines according to claim 1, characterized in that, Step 1 also includes: The detection method measures the water content in the landslide soil and rock in the landslide area. If the water content in the landslide soil is less than a preset threshold, then multiple water injection boreholes are drilled into the landslide soil. Water is injected into the water injection borehole using a water injection device to increase the water content in the landslide soil and rock, so as to freeze the landslide soil and rock.

3. The method for controlling landslides in open-pit mines according to claim 2, characterized in that, The water injection borehole is drilled from the top surface of the landslide rock and soil downwards, with the lower end of the water injection borehole reaching the bottom of the landslide rock and soil.

4. The method for controlling landslides in open-pit mines according to claim 2, characterized in that, The water injection boreholes are drilled from the side of the landslide rock and soil into the landslide rock and soil, and the water injection boreholes are arranged horizontally and located at the bottom of the landslide rock and soil.

5. The method for controlling landslides in open-pit mines according to claim 2, characterized in that, Before injecting freezing fluid into the freezing tube, water is first injected into the water injection borehole.

6. The method for controlling landslides in open-pit mines according to claim 2, characterized in that, While injecting freezing fluid into the freezing tube, water is injected into the water injection borehole.

7. The open-pit mine landslide control method according to claim 6, characterized in that, The multiple freezing holes and multiple water injection holes are divided into sections, and freezing liquid and water are injected into each section in a preset order until the landslide soil and rock of the entire landslide area are frozen.

8. The method for controlling landslides in open-pit mines according to claim 1, characterized in that, Multiple freezing boreholes are drilled obliquely and / or horizontally from the side of the landslide area into the landslide soil, and freezing pipes are laid into the freezing boreholes.

9. The method for controlling landslides in open-pit mines according to claim 1, characterized in that, During the mining operation, the frozen tubes are retrieved sequentially in advance.

10. The method for controlling landslides in open-pit mines according to claim 1, characterized in that, The freezing tube is made of double-layer stainless steel and the inlet of the freezing tube is equipped with a check valve.

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