Karst conduit slow-release plugging method

Abstract

The application relates to the technical field of exploration and engineering, and provides a karst pipeline slow-release plugging method. The method comprises eight steps: drilling, flexible outer wrapping manufacturing, capsule manufacturing, slurry preparation, plugging device assembly and launching, slurry slow-release solidification, injection mass release and secondary injection. The specific process is as follows: firstly, the karst pipeline is explored; the inflatable flexible outer wrapping is manufactured; the slow-release capsule and the buoyancy capsule are manufactured; the outer slurry and the slow-release slurry are configured according to the size of the flexible outer wrapping and the solidification time; the slow-release slurry is injected into the slow-release capsule, the outer slurry is injected into the flexible outer wrapping, and the slow-release capsule and the flexible outer wrapping are launched into the karst pipeline along the drilling hole; after the solidification time is reached, the injection mass is released by cutting the traction rope and the karst pipeline water flow is detected; if the water flow is greater than a predetermined value, the above operation is repeated; otherwise, secondary injection is carried out along the drilling hole until the water flow is completely plugged. The scheme has the beneficial effect that the karst pipeline high-flow-rate and large-flow-rate underground water can be quickly and effectively plugged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of exploration and engineering, and particularly relates to a karst pipeline slow-release plugging method. BACKGROUND

[0002] With the rapid development of China's national economy, the pace of resource development and transportation infrastructure construction continues to accelerate, and the construction of underground projects in the fields of mines, water conservancy and hydropower, highways, railways and the like is increasing. China is vast in territory, and the geological and geomorphological conditions are complex and changeable. In the construction of underground projects in karst areas, large-scale sudden gushing disasters often occur, causing major safety accidents and adverse social impacts. In areas where karst is strongly developed, it is extremely difficult to control gushing disasters due to extremely complex geological conditions.

[0003] The grouting plugging method is one of the most common and effective treatment methods. The grouting material is injected into the rock-soil medium through various ways to reinforce the rock-soil body, complete the plugging of the gushing channel and improve the stability and impermeability of the rock-soil body. The basic principle is to expel air and water in the medium through the slurry, and after the slurry is coagulated, a dense reinforced body with certain strength is formed according to its own high strength and cementing properties to meet the strength requirements or water plugging requirements. According to the action mechanism, it can be divided into filling, permeation, compaction and splitting types, and according to the properties of the grouting material, it can be divided into cement-based slurry grouting and chemical slurry grouting.

[0004] However, due to the diversity and complexity of the rock-soil medium involved in underground engineering, the grouting reinforcement and water plugging effect is often restricted by the medium characteristics and geological conditions. In particular, in karst areas with extremely complex geological conditions, the existing grouting method is still difficult to solve the problem of plugging large-flow gushing in karst pipelines. In addition, due to the limited size of general exploration holes, it is often difficult to put large-diameter aggregates into the karst pipeline, and fine-particle aggregates are easily carried away by large-flow underground water, causing large-scale environmental impact and waste of grouting materials. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a karst pipeline slow-release plugging method. The method can quickly and effectively plug high-flow underground water in karst pipelines and reduce the harm caused by karst gushing to tunnel excavation, ore body mining and the like.

[0006] To achieve the above-mentioned objectives, the present application provides the following technical solutions:

[0007] A karst pipeline slow-release plugging method, characterized by comprising the following eight steps: step one, drilling; step two, flexible outer wrapping; step three, capsule making; step four, slurry preparation; step five, plugging device assembly and launching; step six, slurry slow-release coagulation; step seven, grouting block release; and step eight, secondary grouting.

[0008] The step one: drilling, refers to carry out drilling in the karst area to be grouted, and keep the drilling hole detecting karst conduit for later plugging;

[0009] The step two: flexible outer package making, refers to make the inflatable flexible outer package according to the size and depth of the pre-plugged karst conduit; the flexible outer package is a columnar hollow flexible structure, which can be deformed by swelling, the diameter D1 before swelling is smaller than the diameter of the drilling hole, and the diameter D2 after swelling is larger than the local minimum diameter of the karst conduit;

[0010] The step three: capsule making, refers to make a plurality of slow-release capsules and a plurality of buoyancy capsules and fix them in the flexible outer package; the plurality of slow-release capsules are hollow ellipsoidal capsule structures with openings, which are made of polyvinyl alcohol film, and the dissolution time T1 of the slow-release capsules in water can be adjusted according to the predetermined requirement; the plurality of buoyancy capsules are hollow ellipsoidal capsule structures with openings, which can be filled with air to provide buoyancy for the flexible outer package, so as to ensure that the flexible outer package moves with the groundwater flow in the karst conduit after the grout solidifies;

[0011] The step four: grout preparation, refers to prepare the outer grout and the slow-release grout according to the size of the flexible outer package and the solidification time T2; the outer grout is prepared by using polyether polyol and water, and the slow-release grout is prepared by using toluene diisocyanate; both materials can remain in liquid state under the condition of not mixing; after the slow-release capsules are dissolved, the polyether polyol in the outer grout and the toluene diisocyanate in the slow-release grout are mixed to generate swelling and curing reaction, thereby forming a high-strength plugging grouting block;

[0012] The step five: plugging device assembly and launching, refers to quickly assemble the plugging device composed of a plurality of slow-release capsules filled with slow-release grout, a plurality of buoyancy capsules filled with air, a flexible outer package filled with outer grout, and a traction rope, and launch them into the karst conduit along the drilling hole; the plurality of slow-release capsules filled with slow-release grout, refers to inject the slow-release grout with a predetermined mass W 缓释 into each of the plurality of slow-release capsules and seal them; the plurality of buoyancy capsules filled with air, refers to inject the air with a predetermined volume V 空气 into each of the plurality of buoyancy capsules and seal them; the flexible outer package filled with outer grout, refers to uniformly fix the plurality of slow-release capsules filled with slow-release grout and the plurality of buoyancy capsules filled with air in the flexible outer package by using a strap, and then inject the outer grout with a predetermined mass W 外 into the flexible outer package and seal it, the mass ratio of polyether polyol to toluene diisocyanate is 1:1.05; one end of the traction rope is fixed to the end of the plugging device, and the other end is fixed outside the drilling hole, the length is greater than the distance from the drilling hole to the karst conduit, which is used to pull the plugging device to prevent it from moving with the groundwater flow;

[0013] The step six: slow-release coagulation of the slurry refers to that after the assembled plugging device enters the karst pipeline, the plugging device floats in the underground water flow under the traction of the traction rope, the slow-release capsule gradually dissolves under the soaking action of the water in the outer slurry, the slow-release slurry is released after the dissolution time T1 is reached, the slow-release slurry and the outer slurry meet to generate the expansion and solidification reaction, and the high-strength grouting block is formed after the coagulation time T2 is reached;

[0014] The step seven: release of the grouting block refers to that after the high-strength grouting block is coagulated, the traction rope is cut, the grouting block moves with the underground water flow, and the karst pipeline is plugged when the grouting block moves to a relatively narrow place of the karst pipeline; the water flow in the karst pipeline is detected, and if the water flow is greater than a predetermined value, steps two to seven are repeated.

[0015] The step eight: secondary grouting refers to that after the water flow in the karst pipeline is less than the predetermined value, secondary grouting is performed along the drilling hole to form a secondary grouting reinforcement body until the water flow is completely plugged.

[0016] Compared with the prior art, the technical scheme provided by the application has the following beneficial effects: the application relates to the fields of exploration technology and engineering technology, can quickly and effectively plug the karst pipeline high-speed and large-flow underground water, and reduces the harm of the gushing water to the excavation of the rock-soil body and the mining of the ore body. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A technical flow chart of a slow-release plugging method for a karst pipeline is provided for the embodiments of the application.

[0018] Figure 2 A structural schematic view of a plugging device in the embodiments of the application is provided.

[0019] Figure 3 A state schematic view of step five: assembly and launching of the plugging device in the embodiments of the application is provided.

[0020] Figure 4 A state schematic view of step six: slow-release coagulation of the slurry in the embodiments of the application is provided.

[0021] Figure 5 A state schematic view of step seven: release of the grouting block in the embodiments of the application is provided.

[0022] Figure 6 A state schematic view of step eight: secondary grouting in the embodiments of the application is provided.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1 is a plugging device, 2 is a karst pipeline, 3 is a drilling hole, 4 is a secondary grouting reinforcement body, and 5 is a traction rope.

[0025] 11 is a flexible outer wrap, 12 is a sustained release capsule, 13 is a buoyant capsule, 14 is an outer slurry, 15 is a sustained release slurry, 16 is air. DETAILED DESCRIPTION

[0026] The technical solutions provided by the present application will be further described below in combination with specific embodiments and their accompanying drawings. The advantages and features of the present application will become clearer in combination with the following description.

[0027] It should be noted that the embodiments of the present application have better implementation, and are not any form of limitation of the present application. The technical features described in the embodiments of the present application or the combination of technical features should not be considered in isolation, and they can be combined with each other to achieve better technical effects. The scope of the preferred embodiments of the present application can also include other implementations, and this should be understood by those skilled in the art to which the embodiments of the present application belong.

[0028] The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but in appropriate cases, the technology, methods and devices should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values.

[0029] The drawings of the present application are very simplified and use non-precise proportions, only to facilitate and clarify the purpose of assisting in the description of the embodiments of the present application, and are not a limiting condition for the implementation of the present application. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should fall within the scope that can be covered by the technical content disclosed by the present application. The same reference numerals appearing in the drawings of the present application represent the same features or parts, which can be applied to different embodiments.

[0030] Embodiment

[0031] Note: In order to adapt to the coagulation time T2, the water-soluble speed-controllable polyvinyl alcohol film is made for controlling T1, which is not the key innovative point of the technical solutions of the present application. The existing technology can be used, for example, but not limited to, CN2019105198011.

[0032] The required coagulation time T2 is designed according to the project situation and the investigation before implementation, and the mass ratio of polyether polyol to toluene diisocyanate can be adjusted. The mass ratio of the present embodiment is 1:1.05.

[0033] For example, the polyether polyol is polyether glycol 2000, and the toluene diisocyanate is toluene diisocyanate 2,4. Figure 1As shown, a method for slow-release sealing of karst pipelines is characterized by comprising eight steps: Step 1: drilling; Step 2: flexible outer wrapping fabrication; Step 3: capsule fabrication; Step 4: grout preparation; Step 5: sealing device assembly and deployment; Step 6: slow-release solidification of grout; Step 7: release of grouting blocks; Step 8: secondary grouting.

[0034] Step 1: Drilling, which refers to drilling in the karst area where grouting is planned, and retaining the drill hole 3 where the karst pipe 2 was detected for later sealing;

[0035] Step 2: Flexible outer wrapping fabrication, which refers to the fabrication of an expandable flexible outer wrapping 11 based on the dimensions and depth of the pre-sealed karst pipe 2. The flexible outer wrapping 11 is a columnar hollow flexible structure made of a 3.0mm thick high-elasticity rubber film. The flexible outer wrapping 11 can expand and deform. Before expansion, the diameter D1 is more than 5.0cm smaller than the diameter of the borehole 3. After expansion, the diameter D2 is more than 5.0cm larger than the minimum local diameter of the karst pipe 2. The volume expansion rate is greater than 10%, and the length L is generally selected as 2.0m.

[0036] Step 3: Capsule fabrication, which involves fabricating three sustained-release capsules 12 and two buoyancy capsules 13 and fixing them into the flexible outer casing 11. The three sustained-release capsules 12 are hollow ellipsoidal capsules with openings, made of 2mm thick polyvinyl alcohol film, and the dissolution time T1 of the sustained-release capsules 12 in water can be adjusted as needed. The two buoyancy capsules 13 are hollow ellipsoidal capsules with openings, made of 2mm soft plastic, and can be filled with air to provide buoyancy to the flexible outer casing 11, ensuring that the flexible outer casing 11 moves with the groundwater flow in the karst pipe 2 after the slurry solidifies.

[0037] Step 4: Grout preparation, which refers to preparing the outer grout 14 and the slow-release grout 15 according to the size of the flexible outer wrapper 11 and the setting time T2; the outer grout 14 is made of polyether polyol (YUKOL 5613 type) and water, and the slow-release grout 15 is made of toluene diisocyanate (KONNATE T-80 type). When the slow-release capsule 12 dissolves and releases the slow-release grout 15, the polyether polyol in the outer grout 14 and the toluene diisocyanate in the slow-release grout 15 mix and undergo an expansion and solidification reaction to form a high-strength sealing grout block;

[0038] Step 5: Assembly and deployment of the sealing device, such as... Figure 3 As shown, the sealing device 1, consisting of three slow-release capsules 12 filled with slow-release grout 15, two buoyancy capsules 13 filled with air 16, and a flexible outer casing 11 filled with external grout 14, and the traction rope 5, is quickly assembled and deployed along the borehole 3 to the karst conduit 2; the three slow-release capsules 12 filled with slow-release grout 15 are respectively injected with a predetermined mass W into each of the three slow-release capsules 12. 缓释The slow-release slurry 15 is sealed; two air-filled buoyancy capsules 13, indicating that a predetermined volume V will be released. 空气 Air 16 is injected into the buoyancy capsule 13 and sealed; the flexible outer wrapping 11 filled with outer slurry 14 refers to the three slow-release capsules 12 filled with slow-release slurry 15 and the two buoyancy capsules 13 filled with air 16 being evenly fixed inside the flexible outer wrapping 11 using straps, and then a predetermined mass W is injected into the flexible outer wrapping 11. 外 The external slurry 14 is sealed; one end of the traction rope 5 is fixed to the end of the sealing device 1, and the other end is fixed outside the drill hole 3. The length is greater than the distance from the drill hole 3 to the karst pipe 2 by 3.0 to 5.0 m, and it is used to pull the sealing device 1 to prevent it from moving with the groundwater flow.

[0039] Step Six: Slow-release coagulation of the slurry, such as... Figure 4 As shown, after the assembled sealing device 1 enters the karst pipe 2, it floats in the groundwater flow under the traction of the traction rope 5. The slow-release capsule 12 gradually dissolves under the soaking action of water in the external grout. After the dissolution time T1 is reached, the internal slow-release grout 15 is released. After the slow-release grout 15 meets the external grout 14, the polyether polyol and toluene diisocyanate undergo an expansion and solidification reaction to form a high-strength grout block.

[0040] Step 7: Release the grouting blocks, such as Figure 5 As shown, after the high-strength grouting block solidifies, the traction rope 5 is cut, and the grouting block will move with the groundwater flow. When it moves to a relatively narrow part of the karst pipe 2, it will block the karst pipe 2. The water flow rate in the karst pipe 2 is detected. If the flow rate is greater than 1 / 10 of the original flow rate, the operation of steps two to seven is repeated.

[0041] Step 8: Secondary grouting, such as Figure 6 As shown, when the water flow rate in the karst conduit 2 exceeds the predetermined value, secondary grouting is carried out along the drill hole 3 to form a secondary grouting solid 4 until the water flow is completely blocked.

[0042] like Figure 2 As shown, the sealing device 1 includes three slow-release capsules 12 filled with slow-release slurry 15, two buoyancy capsules 13 filled with air 16, and a flexible outer wrapping 11 filled with outer slurry 14; the three slow-release capsules 12 filled with slow-release slurry 15 and the two buoyancy capsules 13 filled with air 16 are fixed inside the flexible outer wrapping 11; one end of the traction rope 5 is fixed to the end of the flexible outer wrapping 11 and is used to pull the flexible outer wrapping 11 to prevent it from moving with the groundwater flow.

[0043] Based on the above innovative approach, this application provides a slow-release sealing method for karst pipelines, the workflow of which is as follows:

[0044] First, drilling is carried out in the area where grouting is to be carried out, and the drilling hole 3 where the karst pipeline 2 is detected is reserved for later plugging; then, according to the size and depth of the pre-plugged karst pipeline 2, a flexible outer wrapping 11 is made of high-elasticity rubber film; three slow-release capsules 12 are made of polyvinyl alcohol film, and two buoyancy capsules 13 are made of soft plastic and fixed in the flexible outer wrapping 11; according to the size and setting time T2 of the flexible outer wrapping 11, the outer slurry 14 and the slow-release slurry 15 are configured; the plugging device 1 composed of three slow-release capsules 12 filled with slow-release slurry 15, two buoyancy capsules 13 filled with air 16, and the flexible outer wrapping 11 filled with outer slurry 14 is quickly assembled; one end of the traction rope 5 is fixed to the end of the plugging device 1, and the other end is fixed outside the drilling hole 3; the plugging device 1 is put into the karst pipeline 2 along the drilling hole 3; after the assembled plugging device 1 enters the karst pipeline 2, it floats in the underground water flow under the traction of the traction rope 5, the slow-release capsules 12 gradually dissolve under the soaking action of water in the outer slurry, and the internal slow-release slurry 15 is released after the dissolution time T1 is reached, the polyether polyol in the outer slurry 14 and the toluene diisocyanate in the slow-release slurry 15 mix and expand and solidify, and a high-strength grouting block is formed after the setting time T2 is reached; after the high-strength grouting block is set, the traction rope 5 is cut, and the grouting block will move with the underground water flow, and when it moves to a relatively narrow place in the karst pipeline 2, it will plug the karst pipeline 2; the water flow in the karst pipeline 2 is detected, if the water flow is greater than 1 / 10 of the original water flow, the above operation is repeated, if the water flow is less than or equal to 1 / 10 of the original water flow, secondary grouting is carried out along the drilling hole 3, and a secondary grouting reinforcement body 4 is formed until the water flow is completely plugged.

[0045] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects: the present application relates to the fields of exploration technology and engineering technology, and can quickly and effectively plug the karst pipeline 2 with high flow rate and large flow rate of underground water, and reduce the harm caused by water gushing to rock and soil excavation and ore body mining.

[0046] The above description is only a description of the preferred embodiments of the present application, and is not any limitation on the scope of the present application. Any modification or modification made by any person skilled in the art according to the above disclosed technical content shall be regarded as an equivalent effective embodiment, and shall fall within the scope of protection of the technical scheme of the present application.

Claims

1. A slow-release plugging method for karst conduit, characterized in that: Mainly includes the following eight steps, step one: drilling, in the proposed grouting karst area to carry out drilling, keep the detected karst pipeline (2) drilling hole (3) for later sealing; Step two: flexible outer package production, for the completion of the step and designed a unique component flexible outer package (11), the component is a cylindrical hollow flexible structure, can be swelling deformation, swelling before the diameter D 1 is less than the diameter of the drilling hole (3), the diameter after swelling D 2 is greater than the local minimum diameter of the karst pipeline (2); Step three: capsule production, for the completion of the step and designed a unique component slow-release capsule (12) and buoyancy capsule (13); The slow-release capsule (12) is a hollow ellipsoidal capsule structure with a mouth, made of polyvinyl alcohol film, according to the predetermined requirements to adjust the slow-release capsule (12) in water dissolution time T 1; The buoyancy capsule (13) is a hollow ellipsoidal capsule structure with a mouth, filled with air to provide buoyancy for the flexible outer package (11), to ensure that the flexible outer package (11) moves with the groundwater flow in the karst pipeline (2) after the slurry solidification; Step four: slurry preparation, according to the size of the flexible outer package (11), the setting time T 2 configuration of the outer slurry (14) and slow-release slurry (15); The outer slurry (14) uses polyether polyol and water; The slow-release slurry (15) uses toluene diisocyanate, the mass ratio of polyether polyol and toluene diisocyanate is 1:1.05, when the slow-release capsule (12) dissolves and releases the slow-release slurry (15), the polyether polyol in the outer slurry (14) and the toluene diisocyanate in the slow-release slurry (15) mix to expand and solidify, the setting time T 2 to form a high-strength sealing grouting block; Step five: sealing device assembly and launching, for the completion of the step and designed a unique component sealing device (1), including a number of slow-release capsules (12) filled with slow-release slurry (15), a number of buoyancy capsules (13) filled with air (16) and flexible outer package (11) filled with outer slurry (14), wherein the slow-release capsule (12), the buoyancy capsule (13) are uniformly fixed in the flexible outer package (11) by using a belt; Also designed a traction rope (5), one end of which is fixed at the end of the sealing device (1), the other end of which is fixed outside the drilling hole (3), used for pulling the sealing device (1) to prevent it from moving with the groundwater flow; Step six: slurry slow-release solidification, after the assembled sealing device (1) enters the karst pipeline (2), it floats in the groundwater flow under the traction of the traction rope (5), the slow-release capsule (12) gradually dissolves under the soaking action of water in the outer slurry (14), the dissolution time T 1 reaches, the internal slow-release slurry (15) is released, the slow-release slurry (15) and the outer slurry (14) meet to expand and solidify, the setting time T 2 reach the high-strength grouting block; step seven: the grouting block is released, the high-strength grouting block is cut off after solidification, the traction rope (5) is cut off, the grouting block moves together with the groundwater flow, and the karst pipe (2) is blocked when the grouting block moves to a narrow place of the karst pipe (2); the water flow in the karst pipe (2) is detected, and if the water flow is greater than a predetermined value, steps two to seven are repeated; step eight: secondary grouting, after the water flow in the karst pipe (2) is less than the predetermined value, secondary grouting is performed along the drilling hole (3), and a secondary grouting reinforcement body (4) is formed until the water flow is completely blocked.

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