Underground engineering dynamic water step grouting plugging and leakage stopping method capable of detecting water flow channel

Abstract

The invention discloses an underground engineering dynamic water step grouting plugging and leakage stopping method capable of detecting a water flow channel, and belongs to the technical field of underground engineering grouting and water plugging. The method comprises the steps that firstly, in the underground engineering mining process, a water leakage area is surveyed and detected, and the general channel and position of flowing water flow are judged; a grouting hole arrangement scheme is set, and step-by-step grouting is carried out; in the water leakage area, viscous slurry obtained by mixing a first grouting material A and a first grouting material B is used for blocking the flowing water channel; after the flowing water channel is blocked, a second grouting material is injected to reinforce the total cross section of the water leakage area; finally, the flowing water and gushing conditions of the grouting holes and the water flow channels are observed, theoretical knowledge is combined for checking, and the grouting and water plugging effect is analyzed. According to the method, the grouting and water plugging effects are improved by adopting the methods of reconnaissance and detection, step-by-step grouting and nondestructive detection, effective plugging and reinforcement of a water leakage area are realized, and the safety and stability of an underground structure are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting and water blocking in underground engineering, and specifically relates to a method for sealing and stopping leakage of dynamic water in underground engineering by step-by-step grouting. Background Art

[0002] The direct economic losses caused by underground dynamic water disasters rank first among all underground disasters, seriously affecting the stable construction and safe production of underground projects. Underground water disasters are highly concealed, highly destructive, difficult to survey and monitor, difficult to prevent and control, and have a wide range of impact. Therefore, the control of water disasters has become the focus and difficulty of disaster prevention and mitigation of underground projects. In order to ensure the safety and efficiency of underground project construction, scientific construction methods and water blocking materials can effectively promote the dynamic water blocking work in the leaking area.

[0003] In the prior art, there are three general treatment methods for water inrush: dredging, dredging and blocking, and grouting. Drainage and blocking can effectively reduce the flow pressure and water flow of dynamic water, but dredging requires a lot of time and effort to set up drainage structures, and excessive drainage will seriously affect the underground ecological environment. In terms of grouting and blocking, the existing construction method is single, using simple chemical grouting materials or cement-water glass mixed grouting materials to block the leaking area. It is only a rough blockage of the leaking area, and there is no basis for the selection of the grouting hole position and the spacing between the grouting holes; the existing grouting construction method is simple and the material performance is single, which makes it very easy for secondary seepage and water gushing to occur in rock formations with a large degree of fissure development; at the same time, there is a lack of long-term detection work after grouting and blocking, so that the blocking effect cannot be stable and effective for a long time.

[0004] Therefore, it is urgent to develop a comprehensive and effective grouting and water plugging construction method and new grouting materials to solve the defects of traditional grouting and water plugging in construction methods and materials. Summary of the invention

[0005] The purpose of the present invention is to provide a method for sealing and stopping leakage of dynamic water in underground engineering by step-by-step grouting, which can detect water flow channels. The method adopts the methods of "investigation and detection", "step-by-step grouting" and "non-destructive testing" to improve the grouting and water blocking effect, achieve effective sealing and reinforcement of the leaking area, and ensure the stability and integrity of the underground structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for stopping leakage by stepwise grouting of dynamic water in underground engineering capable of detecting water flow channels, characterized in that it comprises the following steps:

[0008] S1. During the mining process of underground projects, the leaking area is surveyed and tested to determine the approximate channel and location of the moving water flow;

[0009] S2. According to the water gushing and crack development in the water flow channel, set up a grouting hole arrangement plan and implement step-by-step grouting. The specific steps are as follows:

[0010] S21, injecting a first grouting material A to transform the aquifer or the abscission layer water-conducting channel, wherein the first grouting material A comprises the following raw materials in parts by weight:

[0011] 850-900 parts of composite cement, 5-8 parts of water reducing agent, 100-150 parts of expansion agent, 0.5-1 part of hydroxypropyl methylcellulose, 10-15 parts of retarder, 10-15 parts of defoamer, 5-10 parts of early strength agent;

[0012] S22, when the slurry contacts the wall of the surrounding rock fissure, an adsorption effect is generated to form an adsorbed water film, which changes the fissure seepage space, increases the seepage resistance, reduces the dynamic water flow pressure, and injects the first grouting material B, which mixes with the first grouting material A to make the slurry viscous and solidified;

[0013] The first grouting material B comprises the following raw materials in parts by weight:

[0014] 8000-10000 parts of water glass, 8000-10000 parts of water, 10-15 parts of carboxypropyl methylcellulose, 20-25 parts of polyanionic cellulose, 35-50 parts of compound food glue, 5-25 parts of sodium polyacrylate;

[0015] The composite food gum is composed of 20 to 30 parts of guar gum, 20 to 30 parts of xanthan gum, 20 to 30 parts of sodium alginate and 30 to 40 parts of sucrose fatty acid ester in parts by weight;

[0016] The water glass in the first grouting material B forms a cement floc similar to slag after contacting with the first grouting material; the guar gum and xanthan gum in the composite food gum are used together to form a gel structure to improve the viscosity, stability and crack resistance of the cement slurry; the sodium alginate contacts with the calcium ions in the cement and forms a gel structure; the sucrose fatty acid ester is used as an emulsifier;

[0017] S23, a viscous mixed slurry obtained by mixing the first grouting material A and the first grouting material B appears in the water leakage area, and the proportion of the first grouting material B is increased to block the dynamic water channel to reduce the dynamic water pressure;

[0018] S3, after the dynamic water channel is sealed, inject the second grouting material to reinforce the entire cross section of the leaking area;

[0019] S4. After grouting and water blocking and reinforcement are completed, observe the dynamic water gushing conditions of the grouting holes and water flow channels, and check and analyze the grouting and water blocking effects in combination with theoretical knowledge.

[0020] The above-mentioned underground engineering dynamic water step-by-step grouting and plugging method for stopping leakage that can detect water flow channels, the exploration and detection step in S1 is to add conductive materials to ordinary Portland cement slurry to perform grouting exploration on the leaking area, monitor the conductivity in real time and observe the distribution area of ​​the water flow channel and the degree of development of cracks in the leaking area.

[0021] The above-mentioned method for sealing and stopping leakage of dynamic water in underground engineering by step grouting that can detect water flow channels, in S2, the specific steps of the grouting hole step plan are: when the tunnel is a repair or expansion tunnel, the cracks are relatively developed and the full-section grouting plan is selected. The spacing between the grouting holes in the full-section grouting plan is not more than 4m, and water is blocked from both sides of the tunnel to the middle area; when the tunnel is a newly excavated tunnel, a point-to-point grouting plan is implemented.

[0022] The above-mentioned method for sealing and stopping leakage of dynamic water in underground engineering by step-by-step grouting in a water flow channel that can detect water flow, in S2, when the water flow rate is less than 15L / min, the first grouting material A is directly injected to transform the aquifer or the abscission layer water guide channel; when the water flow rate is greater than 15L / min, a method of first draining and then injecting is adopted; the outer end of the grouting hole used for grouting is connected to a grouting plug, and the grouting plug can expand under the action of grouting pressure in the grouting hole and squeeze the inner wall of the grouting hole.

[0023] The above-mentioned method for sealing and stopping leakage of dynamic water in underground engineering projects that can detect water flow channels, in S2, during the initial grouting to stop leakage, the volume ratio of the first grouting material A to the first grouting material B is 1:0.2~0.4, and after the sealing is successful, the sealing stage is carried out, the volume ratio of the high-flowability, fast-setting, high-strength, anti-dispersion grouting material to the modified alkali-activated material is 1:0.5~0.8, and the grouting pressure does not exceed 5MPa.

[0024] In the above-mentioned method for sealing and stopping leakage of dynamic water in underground engineering projects that can detect water flow channels, in S3, the second grouting material includes the following raw materials in parts by weight: 900-950 parts of ultrafine silicate cement, 4-6 parts of water reducer, 50-100 parts of expansion agent, 3-10 parts of accelerator, 20-50 parts of nano-silicon dioxide, and 0.5-1 part of graphene oxide.

[0025] In the above-mentioned underground engineering dynamic water step-by-step grouting plugging and leak-stopping method capable of detecting water flow channels, the particle size of the ultrafine silicate cement is 2000 meshes.

[0026] Another object of the present invention is to provide a system adopted by the above-mentioned underground engineering dynamic water step-by-step grouting plugging and leakage stopping method that can detect water flow channels, including a water inflow observation system, a radar non-destructive testing system and a data analysis system. The water inflow observation system is used to detect the change of seepage water inflow before and after grouting; the radar non-destructive testing system includes a signal transmitting antenna and a signal receiving antenna, and high-frequency electromagnetic waves are emitted to the underground through the signal transmitting antenna. When the electromagnetic waves encounter an interface with electrical differences, they are reflected. The signal receiving antenna receives and records the reflected data, and analyzes it through the data analysis system to finally determine the grouting remedial measures.

[0027] Compared with the prior art, the present invention brings the following beneficial technical effects:

[0028] (1) The "exploration and detection" method of the present invention is to add conductive materials such as metal powder to ordinary silicate cement slurry, conduct grouting exploration on the leaking area, and monitor parameters such as conductivity in real time. It can accurately detect the distribution area of ​​the water flow channel and the degree of development of the cracks in the leaking area, provide a basis for the setting of the grouting hole layout plan, and effectively improve the efficiency and effect of grouting water blocking.

[0029] (2) The present invention adopts the method of "distributed grouting" to improve the singleness of the traditional grouting and water blocking construction method. The first grouting material A is used to transform the aquifer or the absorptive layer water channel. When the slurry contacts the wall of the surrounding rock fissure, an adsorption effect is generated to form an adsorbed water film, which changes the fissure seepage space, increases the seepage resistance, reduces the dynamic water flow pressure, and even nearly turns it into static water. Then the first grouting material B is injected and mixed with the first grouting material A, and it quickly thickens and consolidates. The consolidated body is different from the brittle consolidated body of ordinary cement-water glass. The consolidated body produced by the mixing of these materials has good viscosity, good plasticity and is not easy to break, and can better block the water flow channel. Finally, the second grouting material is used to perform full-section grouting on the original leaking area, so that the micro-nano slurry is grouted into the tiny cracks to achieve the effect of grouting reinforcement. The goal of "instant water stopping, permanent reinforcement, and prevention of recurrence" is achieved.

[0030] (3) The present invention uses the method of "radar nondestructive testing" to conduct long-term testing on the sealed leaking area, predict the possibility of secondary water inrush in advance, use electromagnetic wave detection to analyze the cause, and take grouting remedial measures. It eliminates secondary repairs, improves the efficiency of grouting water plugging, and ensures the effect of grouting water plugging.

[0031] In summary, the present invention proposes a method for sealing and stopping leakage of dynamic water in underground engineering projects that can detect water flow channels. The distributed injection of the first grouting material A and the second grouting material B in the distributed grouting is combined with the improvement of the raw materials of the two. Compared with the one-step grouting in the prior art, the method of the present invention has a better sealing effect. The method of the present invention is easy to operate and is convenient for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings:

[0033] Figure 1 It is a flow chart of a method for underground engineering dynamic water step-by-step grouting to seal and stop leakage that can detect water flow channels according to the present invention;

[0034] Figure 2 It is a schematic diagram of the connection state of the grouting pipeline during grouting of the present invention;

[0035] In the figure:

[0036] 1. Double-liquid grouting machine, 2. Grouting bucket for the first grouting material B, 3. Grouting bucket for the first grouting material A, 4. Grouting suction port, 5. Grouting outlet, 6. Three-way joint, 7. Pressure gauge, 8. Pressure relief valve, 9. Tunnel surrounding rock, 10. Hole sealer, 11. Grouting pipe. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0038] In the description of this application, words such as "first" and "second" are only used to distinguish different objects, and do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0039] The technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0040] The main technical concept of the present invention is: first, the approximate channel and position of the dynamic water flow are determined by surveying and detecting the leaking area, and then a grouting hole arrangement plan is set according to the water gushing and crack development in the water flow channel, and grouting is carried out in steps. By improving the first grouting material A and the first grouting material B, a viscous mixed slurry can be quickly formed in the leaking area in combination with the step-by-step grouting method, and then combined with the second grouting material, the full-section reinforcement of the leaking area can be achieved.

[0041] All raw materials of the first grouting material A, the first grouting material B and the second grouting material described in the present invention can be purchased through commercial channels.

[0042] The first grouting material A of the present invention comprises the following raw materials in parts by weight: 850-900 parts of composite cement, 5-8 parts of water reducing agent, 100-150 parts of expansion agent, 0.5-1 part of hydroxypropyl methylcellulose, 10-15 parts of retarder, 10-15 parts of defoaming agent, and 5-10 parts of early strength agent.

[0043] The above-mentioned composite cement refers to a composite material composed of ultrafine silicate cement as a matrix, alkali-resistant glass fiber, general synthetic fiber, various ceramic fibers, high-performance fibers such as carbon and aramid, metal wire, natural plant fiber and mineral fiber as reinforcement, and fillers, chemical additives and water through a composite process; the above-mentioned water reducer can be selected from lignin sulfonate sodium salt water reducer, naphthalene series high-efficiency water reducer, aliphatic high-efficiency water reducer, amino high-efficiency water reducer or polycarboxylic acid high-efficiency water reducer.

[0044] Preferably, the water-cement mass ratio in the first grouting material A is 0.8 to 1:1.

[0045] The first grouting material B of the present invention comprises the following raw materials in parts by weight: 8000-10000 parts of water glass, 8000-10000 parts of water, 10-15 parts of carboxypropyl methylcellulose, 20-25 parts of polyanionic cellulose, 35-50 parts of compound food gum, and 5-25 parts of sodium polyacrylate; the compound food gum is composed of 20-30 parts of guar gum, 20-30 parts of xanthan gum, 20-30 parts of sodium alginate and 30-40 parts of sucrose fatty acid ester in parts by weight.

[0046] Although the raw materials used in the above-mentioned first grouting material A and the first grouting material B are common raw materials in the prior art, their combined use can bring about significant beneficial technical effects, and the principle is described in detail below.

[0047] When the first grouting material A contacts the first grouting material B, the first grouting material A and the water glass will form a cement floc similar to slag due to the water glass contained in the first grouting material B, and the carboxypropyl methylcellulose in the first grouting material B dissolves quickly in cold water, and the polyanionic cellulose and sodium polyacrylate can enhance the viscosity of the cement floc, making it gather together to form a mass. At this time, the composite food gum in the first grouting material B plays the role of "rebar", among which guar gum can form a gel structure when used in combination with xanthan gum, which can improve the viscosity, stability and crack resistance of cement slurry. The gel structure formed when the sodium alginate in the composite food gum contacts the calcium ions in the composite cement increases the viscosity and stability of the slurry, and improves the crack resistance and toughness of the slurry. The sucrose fatty acid ester in the composite food gum acts as an emulsifier, which can refine and stabilize the particles in the cement slurry, improve the fluidity and uniformity of the slurry, and increase the bonding between the cement slurry and rock and soil. The comprehensive use of four raw materials, guar gum, xanthan gum, sodium alginate and sucrose fatty acid ester, as a composite food gum can significantly improve the mechanical properties, durability and construction performance of cement and concrete through multiple mechanisms such as thickening, gelation, emulsification and bonding, providing an innovative and effective material enhancement method for engineering applications.

[0048] The second grouting material in the present invention is a fast-hardening, early-strength, high-fluidity, fast-setting, and expansive micro-nano grouting reinforcement material, and its raw materials include the following:

[0049] 2000 mesh ultrafine silicate cement, water reducing agent, expansion agent, accelerating agent, nano-silicon dioxide, graphene oxide.

[0050] Furthermore, in terms of weight, the ratio is 900-950 parts of 2000-mesh ultrafine silicate cement, 4-6 parts of water reducing agent, 50-100 parts of expansion agent, 3-10 parts of accelerating setting agent, 20-50 parts of nano-silicon dioxide, and 0.5-1 part of graphene oxide.

[0051] The present invention will be further described below in conjunction with specific embodiments.

[0052] like Figure 1 As shown, the present invention provides a method for underground engineering dynamic water stepwise grouting plugging and leak-proofing capable of detecting water flow channels, comprising the following steps:

[0053] S1. During the underground mining process, the leaking area is surveyed and tested to determine the approximate channel and position of the moving water flow; the specific steps of the survey and testing are: adding conductive materials such as metal powder to ordinary Portland cement slurry, conducting grouting exploration in the leaking area, real-time monitoring of parameters such as conductivity, observing the distribution area of ​​the water flow channel and the degree of development of cracks in the leaking area, and based on this, setting the layout plan of the grouting holes.

[0054] The above-mentioned arrangement of grouting holes is specifically as follows: when the tunnel is being repaired or expanded, the cracks are relatively developed and a full-section grouting scheme is selected (the spacing between grouting holes should not exceed 4m), and water is blocked from both sides to the middle area; when the tunnel is a newly excavated tunnel, the rock mass is relatively complete and there are almost no cracks, and a point-to-point grouting scheme is implemented.

[0055] Furthermore, the construction method is selected according to the size of the water flow rate. Specifically, the water volume of 15L / min is used as the standard. When the water flow rate is less than 15L / min, the first grouting material A is directly injected to transform the aquifer or the abscission water channel; when the water flow rate is greater than 15L / min, the method of draining first and then injecting needs to be considered.

[0056] Furthermore, when setting the grouting hole, the outer end of the grouting hole is connected to a grouting plug, which can expand under the action of the grouting pressure in the grouting hole, squeeze the inner wall of the grouting hole, and prevent leakage along the hole wall; the grouting plug contains a one-way valve inside, which only allows external slurry to enter the interior and prohibits the slurry from flowing out from the inside to the outside.

[0057] S2. After the grouting hole layout is designed, grouting is carried out step by step. The specific steps are as follows:

[0058] S21. Inject the first grouting material A to transform the aquifer or the absorptive layer water channel. When the slurry contacts the crack wall of the surrounding rock, an adsorption effect is generated to form an adsorbed water film, which changes the crack seepage space, increases the seepage resistance, reduces the dynamic water flow pressure, and even nearly turns it into static water.

[0059] S22, injecting the first grouting material B, which is mixed with the first grouting material A to make the slurry thick and solidified;

[0060] S23, a viscous mixed slurry obtained by mixing the first grouting material A and the first grouting material B appears in the water leakage area, and the proportion of the first grouting material B is increased to block the dynamic water channel, so as to reduce the dynamic water pressure or even stop the water;

[0061] S3, after the dynamic water channel is sealed, inject the second grouting material to reinforce the entire cross section of the leaking area;

[0062] S4. After grouting and water blocking and reinforcement are completed, observe the dynamic water gushing conditions of the grouting holes and water flow channels, and check and analyze the grouting and water blocking effects in combination with theoretical knowledge.

[0063] Furthermore, during the initial grouting to stop leakage, the volume ratio of the first grouting material A to the first grouting material B is 1:0.2-0.4. After the plugging is successful, the sealing stage is carried out, and the volume ratio of the first grouting material A to the first grouting material B is 1:0.5-0.8. The grouting pressure is not easy to exceed 5MPa.

[0064] Embodiment 1:

[0065] The method of the present invention is applied to practical engineering, such as Figure 2 As shown, the required equipment includes a double-liquid grouting machine 1, a grouting bucket 2 for the first grouting material B, a grouting bucket 3 for the first grouting material A, a grouting port 4, a grouting port 5, a three-way joint 6, a pressure gauge 7, a pressure relief valve 8, a tunnel surrounding rock 9, a hole sealer 10, and a grouting pipe 11. The double-liquid grouting machine 1, the grouting bucket 2 for the first grouting material B, and the grouting bucket 3 for the first grouting material A provide the second grouting material, the first grouting material B, and the first grouting material A respectively, and a grouting port 4 and a grouting port 5 are arranged on the side of the double-liquid grouting machine 1. The grouting bucket 2 for the first grouting material B and the grouting bucket 3 for the first grouting material A are connected to the grouting port 4 through their own pipelines, and the grouting port 5 is connected to the three-way joint 6, the pressure gauge, and the hole sealer 10 through a pipeline, and the upper end of the hole sealer 10 is connected to the grouting pipe 11.

[0066] After the above system is installed, the water inflow observation system, radar nondestructive testing system and data analysis system are arranged. The water inflow observation station is set up underground to arrange the water inflow observation system. The water inflow observation system is used to detect the change of water inflow before and after grouting. The radar nondestructive testing system includes a signal transmitting antenna and a signal receiving antenna. The signal transmitting antenna transmits high-frequency electromagnetic waves (1MHz~10GHz) to the underground. When the electromagnetic waves encounter the interface (crack) with electrical differences, they are reflected. The signal receiving antenna receives and records the reflected data. The collected data is analyzed and processed. The signal-to-noise ratio and resolution of the signal are improved through digital filtering processing, deconvolution processing and other methods in the data analysis system. Then, on the radar reflection waveform, the abnormal signal strength enhancement and signal frequency change signals are analyzed to determine the location, length, width and depth of the leaking area. The leaking area is tested for a long time, once every 10 days in the first three months, and once every two months thereafter. The possibility of secondary water inflow is predicted in advance, and the cause is analyzed by electromagnetic wave detection, and grouting remedial measures are taken.

[0067] Parts not described in the present invention can be implemented by referring to the existing technology.

[0068] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A method for sealing and stopping leakage of underground engineering dynamic water by step-by-step grouting capable of detecting water flow channels, characterized in that: The following steps are involved: S1. During the mining process of underground projects, the leaking area is surveyed and tested to determine the approximate channel and location of the moving water flow; S2. According to the water gushing and crack development in the water flow channel, set up a grouting hole arrangement plan and implement step-by-step grouting. The specific steps are as follows: S21, injecting a first grouting material A to transform the aquifer or the abscission layer water-conducting channel, wherein the first grouting material A comprises the following raw materials in parts by weight: 850-900 parts of composite cement, 5-8 parts of water reducing agent, 100-150 parts of expansion agent, 0.5-1 part of hydroxypropyl methylcellulose, 10-15 parts of retarder, 10-15 parts of defoamer, 5-10 parts of early strength agent; S22, when the slurry contacts the wall of the surrounding rock fissure, an adsorption effect is generated to form an adsorbed water film, which changes the fissure seepage space, increases the seepage resistance, reduces the dynamic water flow pressure, and injects the first grouting material B, which mixes with the first grouting material A to make the slurry viscous and solidified; The first grouting material B comprises the following raw materials in parts by weight: 8000-10000 parts of water glass, 8000-10000 parts of water, 10-15 parts of carboxypropyl methylcellulose, 20-25 parts of polyanionic cellulose, 35-50 parts of compound food glue, 5-25 parts of sodium polyacrylate; The composite food gum is composed of 20 to 30 parts of guar gum, 20 to 30 parts of xanthan gum, 20 to 30 parts of sodium alginate and 30 to 40 parts of sucrose fatty acid ester in parts by weight; The water glass in the first grouting material B forms a cement floc similar to slag after contacting with the first grouting material; the guar gum and xanthan gum in the composite food gum are used together to form a gel structure to improve the viscosity, stability and crack resistance of the cement slurry; the sodium alginate contacts with the calcium ions in the cement and forms a gel structure; the sucrose fatty acid ester is used as an emulsifier; S23, when a viscous mixed slurry obtained by mixing the first grouting material A and the first grouting material B appears in the water leakage area, increasing the proportion of the first grouting material B to block the dynamic water channel to reduce the dynamic water pressure; S3, after the dynamic water channel is sealed, inject the second grouting material to reinforce the entire cross section of the leaking area; S4. After grouting and water blocking and reinforcement are completed, observe the water seepage in the grouting holes and water flow channels, and check and analyze the grouting and water blocking effects based on theoretical knowledge.

2. According to claim 1, a method for sealing and stopping leakage of underground engineering dynamic water by step-by-step grouting in which water flow channels can be detected, characterized in that: The survey and detection steps in S1 are to add conductive materials to ordinary silicate cement slurry to perform grouting exploration on the leaking area, monitor the conductivity in real time, and observe the distribution area of ​​the water flow channel and the degree of development of cracks in the leaking area.

3. According to claim 1, a method for sealing and stopping leakage of underground engineering dynamic water by step-by-step grouting capable of detecting water flow channels, characterized in that: In S2, the specific steps of the grouting hole step plan are: when the tunnel is being repaired or expanded, the cracks are relatively developed and a full-section grouting plan is selected. The spacing between the grouting holes in the full-section grouting plan is not more than 4m, and water is blocked from both sides of the tunnel to the middle area; when the tunnel is a newly excavated tunnel, a point-to-point grouting plan is implemented.

4. The underground engineering dynamic water step-by-step grouting plugging and leak-proofing method capable of detecting water flow channels according to claim 1 is characterized in that: In S2, when the water flow rate is less than 15L / min, the first grouting material A is directly injected to transform the aquifer or the abscission layer water guide channel; when the water flow rate is greater than 15L / min, the method of first draining and then injecting is adopted; the outer end of the grouting hole used for grouting is connected to a grouting plug, and the grouting plug can expand under the action of grouting pressure in the grouting hole and squeeze the inner wall of the grouting hole.

5. The underground engineering dynamic water step-by-step grouting plugging and leak-proofing method capable of detecting water flow channels according to claim 1 is characterized in that: In S2, during the initial grouting to stop leakage, the volume ratio of the first grouting material A to the first grouting material B is 1:0.2~0.

4. After the plugging is successful, the sealing stage is carried out. The volume ratio of the high-flowability, fast-setting, high-strength anti-dispersion grouting material to the modified alkali-activated material is 1:0.5~0.8, and the grouting pressure does not exceed 5MPa.

6. The underground engineering dynamic water step-by-step grouting plugging and leak-proofing method capable of detecting water flow channels according to claim 1 is characterized in that: In S3, the second grouting material includes the following raw materials in parts by weight: 900-950 parts of ultrafine silicate cement, 4-6 parts of water reducing agent, 50-100 parts of expansion agent, 3-10 parts of accelerating setting agent, 20-50 parts of nano silicon dioxide, and 0.5-1 part of graphene oxide.

7. The underground engineering dynamic water step-by-step grouting plugging and leak-proofing method capable of detecting water flow channels according to claim 6 is characterized in that: The particle size of ultrafine silicate cement is 2000 mesh.

8. A system used in a method for stopping leakage by stepwise grouting of dynamic water in underground engineering capable of detecting water flow channels as claimed in any one of claims 1 to 7, characterized in that: It includes a water inflow observation system, a radar nondestructive testing system and a data analysis system. The water inflow observation system is used to detect the change of water inflow before and after grouting; the radar nondestructive testing system includes a signal transmitting antenna and a signal receiving antenna. High-frequency electromagnetic waves are emitted to the underground through the signal transmitting antenna. When the electromagnetic waves encounter an interface with electrical differences, reflection occurs. The signal receiving antenna receives and records the reflected data, which is analyzed through the data analysis system to finally determine the grouting remedial measures.

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