Underground engineering waterproof layer sequential grouting method based on seepage path development form

Abstract

The invention belongs to the field of underground engineering leakage water treatment, and provides an underground engineering waterproof layer sequential grouting method based on a seepage path development morphology, which mainly comprises two parts: determination of a grouting scheme and a grouting sequence: firstly determining the grouting scheme and then determining the grouting sequence; compared with the prior art, the method has the advantages that the development form of the leakage water of the underground structure can be accurately obtained, then the targeted grouting scheme is formulated according to the development form, and the grouting efficiency is improved. Comprising the steps of selecting a grouting material, and determining a mix proportion, a grouting range and a grouting position of the grouting material.

Description

Technical Field

[0001] The invention belongs to the field of underground engineering water leakage treatment, and in particular relates to a sequential grouting method for underground engineering waterproofing layers based on the development morphology of seepage paths. Background Art

[0002] In recent decades, my country's underground engineering construction technology and equipment have made great progress. Various construction methods have been widely used in my country's underground engineering construction. my country's underground engineering mechanization level, construction efficiency and construction capacity have reached the international advanced level. However, in terms of the safety and stability of underground engineering during operation, there is still a large gap between the advanced level abroad, mainly manifested in the frequent occurrence of base diseases, main structure cracks and water leakage in a considerable number of underground engineering structures. The most common problem is water leakage. Taking tunnel engineering as an example, the so-called "nine out of ten tunnels leak" reflects the frequent water leakage problem.

[0003] At present, the most widely used and efficient technology for solving water leakage problems in underground projects in my country is grouting. This technology mainly includes the following five steps: (1) Detection and location of leakage points: First, it is necessary to detect and locate the leakage points. The leakage location can be confirmed by water pressure test, spray test, visual inspection and other methods; (2) Preparation work: Before grouting repair, it is necessary to prepare the area around the leakage point, including cleaning the surface around the leakage point, repairing cracks, filling cavities, etc.; (3) Grouting material preparation: Select appropriate grouting materials. According to the characteristics and severity of the leakage point, polyurethane grouting materials, epoxy resin, etc. can be selected; (4) Grouting construction: Grouting construction work is carried out according to the construction requirements and the properties of the grouting materials. Grouting can be carried out by mechanical grouting and manual grouting. Mechanical grouting is often used for large-scale leakage repair; (5) Evaluation of treatment effect: After the grouting repair work is completed, the repair effect needs to be evaluated. The repair effect can be verified by observing the leakage situation and conducting pressure tests.

[0004] The existing technology mainly sets up grouting holes on both sides of the structural leakage point and injects chemical plugging slurry into the seepage channel. There are the following problems: First, the experience of detecting and locating leakage points is highly subjective, and it is basically impossible to obtain the leakage situation behind the wall of the underground engineering structure, which leads to the plugging of leakage only in a local area and cannot form an effective plugging barrier; secondly, the flow path and spatial form of the leaking water behind the wall are not considered in the preparation of grouting materials, and there is a certain degree of blindness in the selection and matching of materials. The above two points cause the current underground engineering leakage problem to recur repeatedly and it is difficult to completely cure it. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a sequential grouting method for underground engineering waterproofing layer based on the development morphology of seepage path to solve the problems in the prior art. The technical solution adopted by the present invention is:

[0006] The method for sequential grouting of underground engineering waterproofing layer based on the development morphology of seepage path includes the following steps:

[0007] Step 1, determine the grouting scheme: determine the grouting scheme for underground projects based on three parameters, namely, grouting range, grouting material type, and AB component ratio of two-component grouting materials;

[0008] Step 2: Determine the grouting sequence according to the spatial morphology of the leakage water development:

[0009] If the space is hollow, the reconstruction of the waterproof layer includes three steps: using foamed polyurea silicate material to quickly fill the hollow space and cut off the water flow path; using reinforced polyurea silicate material to enhance the strength of the existing space to ensure that it can withstand the pressure of water flow and improve the strength of the waterproof layer structure; injecting acrylic resin to effectively block the small spaces in the filling space that cannot be filled due to the high viscosity of the polyurea silicate material, thus building an effective waterproof layer and preventing any groundwater from passing through;

[0010] If the spatial form is a crack with a width of more than 100 μm, the reconstruction of the waterproof layer includes: first, using reinforced polyurea silicate material to seal the cracks, effectively isolating the flow of most groundwater; injecting acrylic resin to effectively seal the fine cracks inside the reinforced polyurea silicate material plugging body, and reconstructing an effective groundwater waterproof layer;

[0011] If the spatial form is a tiny crack with a width of less than 100 μm, acrylic resin is directly used to seal the crack and reconstruct the underground engineering water leakage sealing and waterproofing layer;

[0012] Step 3: Start grouting after determining the grouting sequence.

[0013] Furthermore, in order to ensure that a seepage waterproof layer for underground engineering is formed within a specified range, the slurry flow time is determined according to the grouting space length and the grouting speed, thereby determining the mix ratio of the AB components of the two-component chemical grouting material.

[0014] Furthermore, in step 1, the grouting material is a foaming grouting material, a reinforcement grouting material and a high-fluidity grouting material;

[0015] Among them, the foaming grouting material is the foaming polyurea silicate material; the reinforced grouting material is the reinforced polyurea silicate material; the high-flowability grouting material is the acrylic resin, and its viscosity is not higher than 3cP;

[0016] If the underground project to be treated is a building basement, choose reinforced acrylic resin; if the underground project to be treated is a railway tunnel, choose high-elastic acrylic resin.

[0017] Furthermore, in step 1, a refined detection instrument based on ultrasonic phased array technology is used to carry out refined detection of the development and flow paths of leakage water such as cracks and cavities within a certain radius of 0.5m behind the inner wall of the underground engineering leakage point, reconstruct the spatial model of crack development in the leakage area, obtain the flow path of leakage water within a given range, and obtain the spatial shape, width and length of grouting treatment.

[0018] The present invention has the following beneficial effects:

[0019] (1) The present invention can accurately know the development form of underground structure leakage water, and then formulate a targeted grouting plan according to the development form, including the selection of grouting materials, the proportion of grouting materials, the determination of grouting range and grouting position. Therefore, the present invention has a high success rate;

[0020] (2) The present invention rationally matches chemical grouting materials of different viscosities and their injection sequence according to the crack morphology, realizes the scientific matching of plugging materials at different scales, can effectively give play to the advantages of grouting materials of different viscosities, and recreates an effective underground engineering waterproof layer;

[0021] (3) The present invention has a high success rate and significant economic and social benefits. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0023] The core invention of the waterproof layer reconstruction technology of the present invention mainly includes two parts: determination of grouting scheme and grouting sequence

[0024] Step 1: Determine the grouting plan

[0025] Three parameters need to be determined to clarify the grouting plan for underground projects, namely the grouting range, the type of grouting materials, and the proportion of the two-component grouting materials. The determination of the above three parameters depends on refined detection technology.

[0026] Through the use of refined detection instruments based on ultrasonic phased array technology, refined detection of the development and flow paths of leakage water such as cracks and voids within a certain radius of 0.5m behind the inner wall of the underground engineering leakage point is carried out, the spatial model of crack development in the leakage area is reconstructed, the flow path of leakage water within a given range is obtained, and the spatial shape, width and length of grouting treatment are obtained.

[0027] As for the spatial form of grouting treatment, if it is a cavity, you need to choose foaming grouting material, reinforced grouting material and high-fluidity grouting material; if it is a crack with a width of more than 100μm, choose reinforced grouting material and high-fluidity grouting material; if it is a tiny crack with a width of less than 100μm, choose high-fluidity grouting material.

[0028] The selected grouting materials are all AB two-component materials, which do not react chemically with groundwater. The selected foaming grouting materials are foaming polyurea silicate materials with high expansion ratio, good stability and no spontaneous combustion; the selected reinforcement grouting materials are reinforced polyurea silicate materials that do not expand or shrink; the selected high-flow grouting materials require that their viscosity is not higher than 3cP, and acrylic resin is preferred. If the underground project to be treated is a structure with a small vibration load such as an ordinary civil building basement, a reinforced acrylic resin is selected; if the underground project to be treated is a railway tunnel, a high-elastic acrylic resin is selected.

[0029] In order to ensure that the underground engineering leakage waterproof layer is formed within the specified range, it is necessary to determine the slurry flow time according to the grouting space length and grouting speed, so as to determine the mix ratio of the two-component chemical grouting material AB components (the mix ratio of the two-component grouting material largely determines the reaction time of the grouting material)

[0030] Step 2: Determine the grouting sequence based on the spatial morphology of the leakage water development

[0031] The location and depth of the grouting holes are determined based on the three-dimensional refined model to ensure that they can be connected with the existing seepage channels.

[0032] (1) If the space is hollow, the reconstruction of the waterproof layer includes three steps: I. Use foamed polyurea silicate material to quickly fill the hollow space and cut off the water flow path; II. Use reinforced polyurea silicate material to effectively improve the strength of the existing space to ensure that it can withstand the water flow pressure and improve the strength of the waterproof layer structure; III. Inject acrylic resin to effectively block the small spaces in the filling space that cannot be filled due to the high viscosity of the polyurea silicate material, build an effective waterproof layer, and prevent any groundwater from passing through.

[0033] (2) If the spatial form is a crack with a width of more than 100 μm, the reconstruction of the waterproof layer includes two steps: I. First, use reinforced polyurea silicate material to seal the cracks to effectively isolate the flow of most groundwater; II. Inject acrylic resin to effectively seal the small cracks inside the reinforced polyurea silicate material plugging body to reconstruct an effective groundwater waterproof layer.

[0034] (3) If the spatial form is a tiny crack with a width of less than 100 μm, acrylic resin is directly used to seal the crack and reconstruct the underground engineering water leakage sealing and waterproofing layer.

[0035] Other technical methods, including drilling, hole cleaning, grouting, etc. are the same as the existing technology.

[0036] Compared with existing technologies:

[0037] (1) The present invention can accurately know the development form of underground structure leakage water, and then formulate a targeted grouting plan according to the development form, including the selection of grouting materials, the proportion of grouting materials, the determination of grouting range and grouting position. Therefore, the present invention has a high success rate;

[0038] (2) The present invention rationally matches chemical grouting materials of different viscosities and their injection sequence according to the crack morphology, realizes the scientific matching of plugging materials at different scales, can effectively give play to the advantages of grouting materials of different viscosities, and recreates an effective underground engineering waterproof layer;

[0039] (3) The present invention has a high success rate and significant economic and social benefits.

[0040] It should also be noted that the present invention is aimed at the subsequent repair work after grouting and water blocking reinforcement of deep tunnels and shaft wall projects. In other words, the preceding work on which the present invention relies is layered grouting, such as a layered and sequenced multi-slurry combined with decompression and cut-off grouting control method involved in CN109555536A.

[0041] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A sequential grouting method for underground engineering waterproofing layer based on the development morphology of seepage path, characterized in that: The following steps are involved: Step 1, determine the grouting scheme: determine the grouting scheme for underground projects based on three parameters, namely, grouting range, grouting material type, and AB component ratio of two-component grouting materials; Step 2: Determine the grouting sequence according to the spatial morphology of the leakage water development: If the space is hollow, the reconstruction of the waterproof layer includes three steps: using foamed polyurea silicate material to quickly fill the hollow space and cut off the water flow path; using reinforced polyurea silicate material to enhance the strength of the existing space to ensure that it can withstand the pressure of water flow and improve the strength of the waterproof layer structure; injecting acrylic resin to effectively block the small spaces in the filling space that cannot be filled due to the high viscosity of the polyurea silicate material, thus building an effective waterproof layer and preventing any groundwater from passing through; If the spatial form is a crack with a width of more than 100 μm, the reconstruction of the waterproof layer includes: first, using reinforced polyurea silicate material to seal the cracks, effectively isolating the flow of most groundwater; injecting acrylic resin to effectively seal the fine cracks inside the reinforced polyurea silicate material plugging body, and reconstructing an effective groundwater waterproof layer; If the spatial form is a tiny crack with a width of less than 100 μm, acrylic resin is directly used to seal the crack and reconstruct the underground engineering water leakage sealing and waterproofing layer; Step 3: Start grouting after determining the grouting sequence.

2. The method for sequential grouting of underground engineering waterproof layer based on the development morphology of seepage path according to claim 1 is characterized in that: In order to ensure that the underground engineering leakage waterproof layer is formed within the specified range, the slurry flow time is determined according to the grouting space length and the grouting speed, thereby determining the mix ratio of the AB components of the two-component chemical grouting material.

3. The method for sequential grouting of underground engineering waterproof layer based on the development morphology of seepage path according to claim 1 is characterized in that: In the step 1, the grouting material is a foaming grouting material, a reinforcement grouting material and a high-fluidity grouting material; Among them, the foaming grouting material is the foaming polyurea silicate material; the reinforced grouting material is the reinforced polyurea silicate material; the high-flowability grouting material is the acrylic resin, and its viscosity is not higher than 3cP; If the underground project to be treated is a building basement, choose reinforced acrylic resin; if the underground project to be treated is a railway tunnel, choose high-elastic acrylic resin.

4. The method for sequential grouting of underground engineering waterproof layer based on the development morphology of seepage path according to claim 1, characterized in that: In step 1, a fine detection instrument based on ultrasonic phased array technology is used to carry out fine detection of the development and flow path of leakage water such as cracks and cavities within a certain radius of 0.5m behind the inner wall of the underground engineering leakage point, reconstruct the spatial model of the fracture development in the leakage area, obtain the flow path of leakage water within a given range, and obtain the spatial shape, width and length of grouting treatment.