A method, system, terminal and medium for utilizing synchronous grouting based on viscous shield muck

Abstract

The present application discloses a utilization method, system, terminal and medium for synchronous grouting with cohesive shield muck as the base. The method includes: obtaining the soil type and properties of the formation corresponding to the shield muck; when it is determined that the shield muck does not meet the filling standard according to the soil type and properties, determining the mineral composition of the shield muck; obtaining the performance requirements of synchronous grouting, and determining the target geopolymer according to the performance requirements of synchronous grouting; obtaining the grouting material ratio according to the mineral composition and the target geopolymer; after obtaining the grouting material according to the grouting material ratio, injecting the grouting material into the gap between the tunnel and the formation through the grouting system at the tail of the shield machine, and obtaining the monitoring information of surface settlement and segment floating during synchronous grouting and shield tunneling. The present application can effectively handle the waste muck generated during shield tunnel construction, improve the resource utilization rate of shield muck, and reduce the treatment cost and environmental impact.

Description

Technical Field

[0001] This application relates to the technical field of underground tunnel engineering, and particularly to a method, system, terminal and medium for the synchronous grouting utilization of cohesive shield muck base. Background Art

[0002] Cohesive soil is widely distributed. Studying the synchronous grouting utilization of cohesive shield muck base has important theoretical value and engineering significance for dealing with such muck. A large amount of waste muck will be generated during the construction process of earth pressure balance shield. The waste muck not only occupies a large amount of land, but also generates high muck disposal costs. During the muck transportation process, it is easy to cause pollution, and the noise generated by night transportation vehicles will also affect the lives of surrounding residents. In addition, the current muck treatment methods are still mainly external transportation and landfilling due to technical problems, and this treatment method is primitive, backward, inefficient and costly.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] The main purpose of this application is to provide a method, system, terminal and medium for the synchronous grouting utilization of cohesive shield muck base, aiming to solve the problem that in the existing technology, the shield muck is treated by external transportation and landfilling, and the muck cannot be recycled environmentally, resulting in higher treatment costs and greater environmental impact.

[0005] In the first aspect of the embodiment of this application, a method for the synchronous grouting utilization of cohesive shield muck base is provided. The method for the synchronous grouting utilization of cohesive shield muck base includes the following steps: obtaining the soil type and properties of the formation corresponding to the shield muck; when it is determined according to the soil type and properties that the shield muck does not meet the filling standard, determining the mineral composition of the shield muck; obtaining the performance requirements of synchronous grouting, and determining the target geopolymer according to the performance requirements of synchronous grouting; obtaining the grouting material ratio according to the mineral composition and the target geopolymer; after obtaining the grouting material according to the grouting material ratio, injecting the grouting material into the gap between the tunnel and the formation through the grouting system at the tail of the shield machine, and obtaining the monitoring information of surface settlement and segment floating during synchronous grouting and shield tunneling.

[0006] Optionally, in an embodiment of this application, the soil type and properties are fine-grained soil; the obtaining of the soil type and properties of the formation corresponding to the shield muck is specifically: if the soil layer corresponding to the shield muck is within the preset specification standard, the formation corresponding to the shield muck is fine-grained soil.

[0007] Optionally, in an embodiment of the present application, when it is determined that the shield muck does not meet the filling standard according to the soil type and properties of the soil, determining the mineral composition of the shield muck specifically includes: judging whether the shield muck meets the filling standard according to the fine-grained soil. If it is determined that the shield muck does not meet the filling standard according to the fine-grained soil, then performing a mineral composition test on the shield muck to obtain the mineral composition of the shield muck.

[0008] Optionally, in an embodiment of the present application, judging whether the shield muck meets the filling standard according to the fine-grained soil specifically includes: performing a triaxial shear test on the fine-grained soil to obtain the shear strength; judging whether the shear strength reaches the strength index of the muck; if the shear strength does not reach the strength index of the muck, then judging that the shield muck does not meet the filling standard; if the shear strength reaches the strength index of the muck, then judging that the shield muck meets the filling standard.

[0009] Optionally, in an embodiment of the present application, if it is determined that the shield muck does not meet the filling standard according to the fine-grained soil, then performing a mineral composition test on the shield muck to obtain the mineral composition of the shield muck, and then further including: if the gravel in the mineral composition does not meet the treatment specification standard, then performing a grinding treatment on the gravel until the gravel meets the treatment specification standard.

[0010] Optionally, in an embodiment of the present application, determining the target geopolymer according to the performance requirements of the synchronous grouting specifically includes: obtaining the on-site construction requirements and the cost requirements of the geopolymer, and selecting the precursors and activators in the geopolymer according to the on-site construction requirements and the cost requirements of the geopolymer to obtain a plurality of different geopolymers; performing indoor slurry performance test experiments on the plurality of geopolymers to obtain the test performances corresponding to the plurality of geopolymers respectively; determining the target geopolymer from the plurality of geopolymers according to the performance requirements of the synchronous grouting and the plurality of test performances.

[0011] Optionally, in an embodiment of the present application, obtaining the grouting material ratio according to the mineral composition and the target geopolymer specifically includes: obtaining the dosage ranges of the various raw materials in the synchronous grouting according to the mineral composition and the target geopolymer; forming multiple groups of material ratios according to the dosage ranges of the various raw materials; testing the multiple groups of material ratios, and determining the grouting material ratio from the multiple groups of material ratios.

[0012] The second aspect of the embodiments of the present application further provides a viscous shield muck-based synchronous grouting utilization system, wherein the viscous shield muck-based synchronous grouting utilization system includes:

[0013] A formation soil analysis module, configured to obtain the soil type and properties of the formation corresponding to the shield muck;

[0014] A mineral composition determination module, configured to determine the mineral composition of the shield muck when it is determined that the shield muck does not meet the filling standard according to the soil type and properties of the soil layer.

[0015] A geopolymer determination module, configured to obtain the performance requirements for synchronous grouting and determine the target geopolymer according to the performance requirements for synchronous grouting.

[0016] A material ratio determination module, configured to obtain the grouting material ratio according to the mineral composition and the target geopolymer.

[0017] A grouting monitoring module, configured to inject the grouting material into the gap between the tunnel and the formation through the tail grouting system of the shield machine after obtaining the grouting material according to the grouting material ratio, and obtain the monitoring information of surface settlement and segment floating during synchronous grouting and shield tunneling.

[0018] In a third aspect of the embodiments of the present application, a terminal is further provided. The terminal includes a memory, a processor, and a viscous shield muck-based synchronous grouting utilization program stored on the memory and executable on the processor. When the viscous shield muck-based synchronous grouting utilization program is executed by the processor, the steps of the above-mentioned viscous shield muck-based synchronous grouting utilization method are implemented.

[0019] In a fourth aspect of the embodiments of the present application, a computer-readable storage medium is further provided. The computer-readable storage medium stores a viscous shield muck-based synchronous grouting utilization program. When the viscous shield muck-based synchronous grouting utilization program is executed by a processor, the steps of the above-mentioned viscous shield muck-based synchronous grouting utilization method are implemented.

[0020] Advantageous effects: The present application provides a method, system, terminal, and medium for utilizing synchronous grouting based on viscous shield muck. By analyzing the soil type and properties of the soil layer of the shield muck, the muck that can be reused for synchronous grouting is determined. The optimal grouting material ratio is obtained based on the determined muck mineral composition, geopolymer, and grouting performance requirements. Finally, it is actually applied and monitored, so as to effectively treat the waste muck generated during shield tunnel construction, improve the resource utilization rate of shield muck, and reduce the treatment cost and environmental impact. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a flowchart of a preferred embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0023] Figure 2 is a schematic diagram of the specific implementation steps of the entire execution process in a preferred embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0024] Figure 3 is a schematic diagram of the process for grouting monitoring in a preferred embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0025] Figure 4 is a diagram showing the position of the segment for monitoring in a specific embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0026] Figure 5 is a layout diagram of surface monitoring points in a specific embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0027] Figure 6 is a schematic diagram of horizontal scale measurement in a specific embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0028] Figure 7 is a diagram of on-site monitoring results in a specific embodiment of the method for utilizing synchronous grouting with cohesive shield muck base in this application;

[0029] Figure 8 is a structural diagram of a preferred embodiment of the synchronous grouting utilization system with cohesive shield muck base in this application;

[0030] Figure 9 is a structural diagram of a preferred embodiment of the terminal in this application.

[0031] Description of reference numerals:

[0032] 100, formation soil analysis module; 200, mineral composition determination module; 300, geopolymer determination module; 400, material ratio determination module; 500, grouting monitoring module. Detailed implementation manners

[0033] To make the objectives, technical solutions and effects of this application clearer and more definite, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. The described embodiments are only possible technical implementations of this application, not all possible implementations. Based on the embodiments in this application, those skilled in the art can completely combine the embodiments of this application to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of this application.

[0034] While the shield tunneling method facilitates efficient subway construction, the waste muck generated during the construction process also poses challenges to the construction of modern urban civilization. In the face of this prominent problem, an effective approach is to recycle the muck resourcefully. Current research on cohesive soil strata mainly focuses on replacing bentonite in the synchronous grouting material with clay, but its resource utilization rate still needs to be improved. In addition, the research on the reuse of muck in synchronous grouting mainly focuses on solidifying and treating it with cement. From the perspective of low-carbon environmental protection, relatively little research has been conducted on synchronous grouting materials using slag-based geopolymers as binders while meeting the performance requirements of synchronous grouting slurries.

[0035] The following describes the method, system, terminal, and medium for the synchronous grouting utilization of cohesive shield muck according to the embodiments of the present application with reference to the accompanying drawings. In view of the problem in the related technology mentioned above that the shield muck is treated by transporting it out for landfilling, which cannot environmentally recycle the muck, resulting in high treatment costs and significant environmental impacts, the present application provides a method for the synchronous grouting utilization of cohesive shield muck. In this method, by analyzing the soil type and properties of the soil layer of the shield muck, the muck that can be reused in synchronous grouting is determined. Based on the determined mineral composition of the muck, geopolymers, and the performance requirements of grouting, the optimal grouting material ratio is obtained. Finally, it is applied in practice and monitored, so as to effectively treat the waste muck generated during the construction of shield tunnels, improve the resource utilization rate of shield muck, and reduce the treatment costs and environmental impacts. Thus, the technical problem in the related technology that the shield muck is treated by transporting it out for landfilling, which cannot environmentally recycle the muck, resulting in high treatment costs and significant environmental impacts is solved.

[0036] The present application collects and analyzes the shield muck to determine the soil type and properties of the formation. Then, based on the soil type and properties, the mineral composition of the shield muck is further determined. Combining the actual synchronous grouting performance requirements on-site and the cost of geopolymers, the type of geopolymer is determined. The optimal ratio is determined by testing the grouting material. Finally, based on the slurry performance under the optimal ratio, a comparative analysis is carried out with the actual performance requirements of the on-site slurry. Finally, it is applied on-site and the ground settlement and segment floating are monitored.

[0037] The following uses specific embodiments to elaborate on the technical solutions of the present application in detail. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0038] The method for the synchronous grouting utilization of cohesive shield muck according to the preferred embodiment of the present application is as Figure 1 shown. The method for the synchronous grouting utilization of cohesive shield muck includes the following steps:

[0039] In step S101, obtain the soil type and properties of the formation corresponding to the shield muck. It is the basis for determining whether it is suitable for synchronous grouting reuse.

[0040] In a possible implementation, the soil type and properties are fine-grained soil. If the soil layer corresponding to the shield muck is within the preset specification standards, the formation corresponding to the shield muck is fine-grained soil.

[0041] Specifically, in this application, the soil type and properties of the formation are analyzed through shield muck. To determine the soil type and properties of the formation, if the particle content greater than 0.075 mm is greater than 50% of the soil mass, then this type of formation soil is coarse-grained soil, and such muck is not used for subsequent simultaneous grouting; if the particle content less than 0.075 mm is greater than 50% of the soil mass, then the triaxial shear test is used to test the shear strength of the muck. If the strength index of the muck meets the standard of fill soil, direct landfill treatment can be considered; if not, and the fluidity of the muck is relatively large, synchronous grouting and reuse of such formation muck can be considered.

[0042] In a possible implementation, as Figure 2 shown, a triaxial shear test is performed on the fine-grained soil to obtain the shear strength; it is judged whether the shear strength reaches the strength index of the muck; if the shear strength does not reach the strength index of the muck, it is judged that the shield muck does not meet the landfill standard; if the shear strength reaches the strength index of the muck, it is judged that the shield muck meets the landfill standard.

[0043] Specifically, the shear strength of the shield muck is tested through a triaxial shear test, and this shear strength is compared with the "muck strength standard" or "fill soil standard", which is comprehensively determined based on factors such as engineering experience, geological conditions, and performance requirements of grouting materials. If the shear strength of the muck meets or exceeds this standard, then this type of muck may have sufficient strength and can be directly landfilled without the need for synchronous grouting; if the shear strength of the muck does not meet this standard, that is, the strength is low and the fluidity is large, then this type of muck is more suitable for synchronous grouting and reuse. That is to say, the muck for synchronous grouting and reuse in this application is the muck in fine-grained soil whose shear strength does not reach the landfill standard.

[0044] In step S102, the mineral composition of the shield muck is determined according to the soil type and properties. This determines the substitution object and dosage level of the muck in the synchronous grouting material.

[0045] In a possible implementation, it is judged whether the shield muck meets the landfill standard according to the fine-grained soil. If it is judged that the shield muck does not meet the landfill standard according to the fine-grained soil, then the mineral composition test is performed on the shield muck to obtain the mineral composition of the shield muck.

[0046] In a possible implementation, as Figure 2As shown, if the gravel in the mineral composition does not meet the processing specification standards, the gravel is ground until it meets the processing specification standards.

[0047] Specifically, if the clay mineral composition of the soil is relatively high, it can replace bentonite in the simultaneous grouting. Since the proportion of bentonite in the conventional simultaneous grouting is relatively small, in the initial slurry ratio test design, compared with the dosage of other materials such as sand, the dosage level of the muck should not be set too high. On the contrary, if the content of hard minerals (such as quartz and feldspar) in the soil is relatively rich, it can be considered to replace the sand in the simultaneous grouting material. Given that sand occupies a large proportion in the conventional simultaneous grouting material, the dosage level of the muck can be appropriately increased at this time. By reasonably adjusting the dosage of the muck, the performance of the simultaneous grouting material can be optimized to meet the engineering requirements. In addition, if the cohesive soil contains gravel larger than 5 mm, the wet mill can be used to grind the gravel in the muck before the next treatment.

[0048] Furthermore, the montmorillonite content should be not less than 50%, and the illite and kaolinite contents are about 20% and 10% respectively, then the muck can replace bentonite in the simultaneous grouting. If the content of hard minerals (such as quartz and feldspar) in the soil is relatively high (usually greater than 40%) and the particle size distribution is appropriate, it can replace the sand in the simultaneous grouting material.

[0049] It can be understood that the mineral composition of the shield muck directly affects its physical and chemical properties, thus determining whether it is suitable as a component of the grouting material. By analyzing the mineral composition to understand the content of clay minerals, hard minerals (such as quartz, feldspar, etc.) in the muck is crucial for subsequent material ratio and performance optimization. During the analysis process, appropriate analysis techniques (such as X-ray diffraction, scanning electron microscope, etc.) are used to determine the mineral composition of the muck. The analysis results will provide the proportion and type of various minerals in the muck. According to the analysis results, the potential use of the muck in the grouting material is determined. This application determines the potential use and dosage adjustment strategy of the shield muck in the grouting material by analyzing its mineral composition and understanding its physical and chemical properties.

[0050] In step S103, obtain the performance requirements of the simultaneous grouting, and determine the target geopolymer according to the performance requirements of the simultaneous grouting. Select a suitable geopolymer material according to the grouting performance requirements and cost considerations.

[0051] In a possible implementation, the on-site construction requirements and the geopolymer cost requirements are obtained. According to the on-site construction requirements and the geopolymer cost requirements, the precursors and activators in the geopolymer are selected to obtain a plurality of different geopolymers; indoor slurry performance test experiments are carried out on the plurality of geopolymers to obtain the test performances corresponding to each of the plurality of geopolymers; and a target geopolymer is determined from the plurality of geopolymers according to the synchronous grouting performance requirements and the plurality of test performances.

[0052] Specifically, since there are many types of geopolymers (common geopolymers include fly ash-based geopolymers, slag-based geopolymers, metakaolin-based geopolymers, pozzolan-based geopolymers, etc.), when selecting the precursors and activators in the geopolymer, on the premise of ensuring on-site construction safety, it is first necessary to clarify the actual synchronous grouting performance requirements on site, then consider in combination with the geopolymer cost, and finally determine the type of geopolymer through indoor slurry performance test experiments.

[0053] It can be understood that according to the geological conditions of shield construction, engineering requirements, and performance indicators that the slurry needs to meet (such as setting time, strength, fluidity, etc.), the specific performance that the grouting material needs to achieve is determined; according to the possible changes in slurry performance brought about by the combination of precursors (such as slag powder, fly ash, steel slag, etc.) and activators (such as sodium silicate, slaked lime, sodium sulfate, etc.) of different geopolymers, the influence of different types of geopolymers on slurry performance is evaluated. Considering the procurement cost, transportation cost, and usage cost during construction of the geopolymer, on the premise of ensuring that the slurry performance meets the requirements, a geopolymer type with a relatively low cost is selected. By comprehensively considering the on-site grouting performance requirements and the geopolymer cost, through comparative analysis, the most suitable geopolymer type is determined.

[0054] For example, when the site is a water-rich sandy stratum, the requirements for the slurry are similar to those of the double-fluid slurry, such as the setting time of the slurry is required not to be too long. At this time, slag powder with high activity can be selected as the precursor, and sodium silicate can be selected as the alkali activator to meet the requirements of on-site slurry performance and construction safety.

[0055] Furthermore, the selection process of geopolymers is described as follows: Based on the requirements of on-site grouting construction and geological conditions, while ensuring that the slurry performance meets the requirements, efforts are made to reduce the grouting cost. Geopolymer materials mainly consist of precursors and alkali activators. When selecting precursors (such as slag powder, fly ash, and steel slag), the industrial resource conditions around the shield construction site can be considered, and local materials should be given priority. For example, if there is a steel production enterprise in the local area, the slag powder is rich in resources and has a low transportation cost, so it should be the first choice of material. Alkali activators are mostly some chemical products. When selecting them, not only the construction cost should be concerned, but more importantly, their potential corrosiveness should be focused on. It is necessary to strictly follow safety guidelines to ensure the operability and safety of the materials in actual applications. Although a large number of studies have shown that sodium hydroxide (potassium) has a significant activation effect, the activators selected in this application are slaked lime and sodium sulfate, mainly based on the following considerations: Sodium hydroxide (potassium) has strong corrosiveness, there are certain safety hazards in on-site operation, and the cost is relatively high. In contrast, slaked lime and sodium sulfate have the advantages of wide sources, low cost, and relatively safe operation, and are more suitable for on-site applications.

[0056] Based on the actual engineering requirements and economic considerations, this application determines the most suitable type of geopolymer through scientific evaluation methods and reasonable cost analysis. This process not only ensures that the grouting material can meet the construction requirements, but also can reduce the construction cost to a certain extent and improve the economic benefits.

[0057] In step S104, according to the mineral composition and the target geopolymer, the grouting material ratio is obtained. The best-performing grouting material combination is obtained through experimental optimization.

[0058] In a possible implementation manner, according to the mineral composition and the target geopolymer, the dosage ranges of each raw material in the synchronous grouting are obtained; according to the dosage ranges of each raw material, multiple groups of material ratios are formed; the multiple groups of material ratios are tested, and the grouting material ratio is determined from the multiple groups of material ratios.

[0059] Specifically, the optimal ratio of the trial grouting material; after determining the dosage ranges of each material based on the on-site investigation results, the basic characteristics of the muck, and the indoor slurry performance test, the response surface method can be used to analyze the synergistic effects between various factors, and a group of optimal ratios of the grouting material can be obtained by combining the multi-objective optimization method.

[0060] Furthermore, the determination process of the sand content is described as follows: The sand content mainly depends on the mineral composition and particle size distribution of the shield muck. When the shield muck contains more coarse particles or hard minerals (such as quartz and feldspar), the sand content level can be reduced and the muck content level can be increased accordingly when formulating the plan using the experimental design method. Further, the multi-objective optimization design method is used for analysis and research to obtain the optimal slurry ratio that meets the construction requirements.

[0061] Further, the following describes the on-site slurry preparation process: When preparing the slurry on-site, since the geopolymer reacts with water, it may cause uneven mixing of the subsequent muck and the geopolymer. Therefore, it is necessary to prepare the muck slurry in advance in the slurry preparation sequence, and then add the geopolymer. When the slump value is greater than the similar evaluation index S (the S value can be determined by a shear test), it indicates that the muck has a high fluidity and its internal structure is relatively loose. The muck is directly stirred into a slurry according to the water content of the muck optimized by the slurry ratio on-site, and then mixed with other additives for use. Otherwise, it may be necessary to pre-treat the muck by soaking it in water to disperse its structure, and then prepare the muck slurry according to the water content. Finally, the synchronous grouting material is prepared by mixing with additives.

[0062] It can be understood that based on the on-site investigation results, the basic properties of the muck (such as mineral composition, particle size distribution, etc.) and the indoor slurry performance tests, the dosage ranges of various raw materials (such as water, muck, sand, slag powder, sodium sulfate, and hydrated lime) are initially determined. Next, the response surface method (RSM, Response Surface Methodology) is used to analyze the synergistic effects between various factors (i.e., the dosages of various raw materials). (The response surface method is a statistical method used to study the effects of multiple variables on one or more response variables and find the optimal operating conditions). Combining with the multi-objective optimization method, the slurry performance under different dosage combinations is further analyzed to find the optimal ratio that meets all performance requirements (such as strength, fluidity, setting time, etc.). Finally, the actual effects of the selected optimal ratio are verified through laboratory tests or small-scale on-site tests. The tests include slurry performance tests (such as strength tests, fluidity tests, etc.) and the evaluation of the application effects under actual engineering conditions.

[0063] In step S105, after obtaining the grouting material according to the grouting material ratio, the grouting material is injected into the gap between the tunnel and the formation through the grouting system at the tail of the shield machine, and the monitoring information of surface settlement and segment floating is obtained during the synchronous grouting and shield tunneling processes. Verify the grouting effect and adjust the grouting parameters.

[0064] Specifically, as Figure 3 shown, the slurry performance under this optimal ratio is tested by indoor tests, and a comparative analysis is carried out with the actual performance requirements of the on-site slurry. Finally, through on-site application and monitoring of surface settlement and segment floating. During the synchronous grouting process of shield tunnel construction, surface settlement and segment floating are important indicators for judging the grouting quality and effect. By monitoring and analyzing these two indicators, the grouting parameters can be adjusted and the grouting plan can be optimized to control the surface settlement within the design permission range and ensure the stable position of the segments, and minimize the floating phenomenon.

[0065] It is understandable that the slurry properties (such as setting time, strength, fluidity, etc.) under this optimal ratio are compared and analyzed with the slurry properties actually required on site, aiming to ensure that the optimal ratio obtained in the laboratory is also applicable in actual applications. After confirming that the optimal ratio meets the actual requirements, on-site application means preparing the grouting material on site according to the optimal ratio and injecting it into the formation of the shield tunnel. During the simultaneous process of synchronous grouting and shield tunneling, the surface settlement and segment floating are monitored in real time. The surface settlement is one of the important indicators for evaluating the grouting effect. By monitoring the surface settlement amount, it can be judged whether the grouting effectively controls the formation deformation; the segment floating is also an important indicator that needs attention because excessive floating may affect the stability and safety of the tunnel. The monitoring data of surface settlement and segment floating are collected and analyzed, and these data are compared with the preset control standards. If the monitoring data shows that the grouting effect is not ideal (such as excessive surface settlement or excessive segment floating), then the grouting parameters (such as grouting pressure, grouting speed, grouting material, etc.) need to be adjusted according to the data analysis results, and the grouting plan is optimized. Through continuous adjustment and optimization, until the grouting effect meets the design requirements and control standards.

[0066] The specific embodiments of the method for utilizing cohesive shield muck-based synchronous grouting are further illustrated by on-site application cases in the present invention: A field test is carried out in a certain shield section of Line a of Subway A, and the 672-ring segment of the incoming line is selected as the test ring for the new grouting material (the position of the segment in the formation is as Figure 4 shown). Finally, the grouting effect is verified by comparing with the slurry properties of conventional on-site grouting and monitoring the surface settlement and segment floating values.

[0067] Material calculation and preparation stage: According to the grouting volume of one ring on site, the masses of various raw materials (water, muck, sand, slag powder, sodium sulfate, and hydrated lime) required are calculated according to the optimal ratio of the synchronous grouting material. The water content of the muck in the on-site muck pond is measured, and the muck volume is calculated by back-calculation according to the water content formula combined with the dry muck mass obtained from the previous calculation. The required raw materials are temporarily stored in the powder storage tank.

[0068] Material feeding and mixing stage: The calculated and weighed muck is put into a forced mixer for mixing. If the water content of the muck is too low, then water is added to the mixer according to the target water content of the muck at this time, and the mixing continues until the muck is uniform and in a slurry state. Then the calculated and weighed slag powder is added to the muck slurry until the mixture is uniform, and then the weighed sodium sulfate and hydrated lime are added to the above mixture. Note that at this time, the activating materials need to be added while stirring to prevent the slurry from forming lumps. Finally, all the above materials are stirred evenly to form the new grouting material.

[0069] Tank truck mixing and transportation stage: The mixing tank truck stops at the material receiving position below the mixer to ensure that the grouting material can be smoothly transported into the tank truck. After loading, use the mortar transportation and mixing tank truck to transport the new grouting material to the mortar tank opening on the middle plate of the on-site shield launching shaft.

[0070] On-site grouting construction: Use a special tank truck to accurately transport the slurry of the new grouting material to the mortar tank of the shield trolley. Subsequently, these slurries will be evenly injected into the formation to ensure the stability and safety of the construction. Synchronous grouting is carried out simultaneously with shield tunneling and is completed through the synchronous grouting system described above during on-site shield tunneling.

[0071] On-site monitoring plan and monitoring point layout plan: In the application case shown in this application, two detection methods are adopted, namely surface monitoring and segment monitoring.

[0072] For surface monitoring: The principles and methods for laying out points in on-site surface monitoring mainly refer to the "Technical Code for Monitoring of Urban Rail Transit Engineering" (GB 50911-2013). The layout plan for surface settlement monitoring points is as follows: A. It is advisable to use the drilling method for burial, and the burial depth should reach the original soil layer. The diameter should not be less than 120mm, the diameter of the deformed steel bar should be 18mm - 22mm. Below the burial point, use concrete to fix it to the surrounding soil through the deformed steel bar. The consolidation length of the concrete should be about 300mm, and backfill with medium sand. B. The deformed steel bar marking point is not less than 1000mm. Drive the measuring point into the hole, with a height of 20mm - 30mm exposed. Install a plastic protective cover on it, with a diameter of the protective cover not less than 120mm and a 5cm - 10cm concrete at the bottom.

[0073] In addition to the aforementioned test rings, select rings 667, 671, 673, and 677 of the access line as comparison rings, with 7 measuring points arranged on the surface corresponding to each cross-section, as shown in Figure 5 in (a); the spacing of the monitoring points of each ring in the cross-sectional direction on the surface is the same. The schematic layout of the measuring points of test ring 672 in the cross-sectional direction on the surface is shown in Figure 5 in (b).

[0074] The layout plan for segment monitoring is as follows: The shield tunnel adopts a flat single-layer precast reinforced concrete segment lining. The outer diameter of the segment is 6200 mm, the inner diameter is 5500 mm, the thickness is 350 mm, the ring width is 1200 mm, and tenon grooves are set on the longitudinal joint contact surface of the segment. The "3+2+1" block form is adopted, with staggered joint assembly, 16 longitudinal connecting bolts and 12 circumferential bolts. According to the design, the segments are divided into standard lining rings, left-turn lining rings and right-turn lining rings. The shield segments adopt C50 high-strength concrete, and the reinforcement is divided into four forms: 1, 2, 3, and 4, with an impermeability grade of P8. Four rings of special linings are set at the interval connection passage, adopting the form of steel segments + concrete segments, and all are connected with M30 bent bolts.

[0075] In the application case, the horizontal scale observation method is used to measure the attitude of the segments of the shield tunnel, and its specific operation is shown as Figure 6 follows. On the basis of considering the inner diameter of the formed segment, an aluminum alloy scale with a length close to the inner diameter of the segment is selected, a mark is made at the center position of the scale, and a reflector is pasted on its side. When measuring the attitude of the segment, the scale is placed horizontally on the target segment, and a spirit level is used for precise adjustment to ensure its horizontality. Further, a total station is used to measure the center coordinates of the aluminum alloy scale, and then the center coordinates of the segment are calculated according to the actual spatial geometric relationship between the scale and the segment.

[0076] When using the horizontal scale observation method, when the assembled segment is just about to leave the shield tail, the coordinates of its center point are measured and calculated, and then the target segment is monitored regularly, and the real-time change of the floating amount of the segment is obtained through the difference in the vertical coordinates of the segment center.

[0077] As shown in Figure 7 (a) and Figure 7 (b) in, the analysis of on-site measured results: The cross-sectional surface settlement curve of the 672-ring segment using the new grouting material generally conforms to the Peck curve (a mathematical expression based on empirical and experimental data, used to describe the variation law of ground settlement during the construction of shield tunnels), in which the maximum uplift is 5.2 mm and the maximum settlement is 4.6 mm. The cross-sectional surface settlement curves of the monitoring cross-sections of the 667th, 673rd and 677th rings are similar in trend, that is, the surface settlement amounts at the same distance from the tunnel center are similar, and the maximum surface settlement amounts do not exceed 20 mm. The cross-sectional surface settlement of the 672-ring segment using the new grouting material meets the control requirements of the "Code for Engineering Survey of Urban Rail Transit" and the "Code for Construction and Acceptance of Shield Tunnels". The floating values of each ring of segments are all around 50 mm, and the floating value of the 672-ring segment is 47.6 mm, meeting the control requirements of the "Code for Engineering Survey of Urban Rail Transit" and the "Code for Construction and Acceptance of Shield Tunnels".

[0078] Secondly, the viscous shield muck-based synchronous grouting utilization system proposed according to the embodiments of the present application is described with reference to the accompanying drawings.

[0079] Figure 8 It is a structural diagram of the sticky shield muck-based synchronous grouting utilization system of the embodiments of the present application.

[0080] As Figure 8 shown, the sticky shield muck-based synchronous grouting utilization system includes: a formation soil analysis module 100, a mineral composition determination module 200, a geopolymer determination module 300, a material ratio determination module 400, and a grouting monitoring module 500.

[0081] Specifically, the formation soil analysis module 100 is used to obtain the soil type and properties of the formation corresponding to the shield muck.

[0082] The mineral composition determination module 200 is used to determine the mineral composition of the shield muck when it is determined that the shield muck does not meet the filling standard according to the soil type and properties.

[0083] The geopolymer determination module 300 is used to obtain the performance requirements of synchronous grouting and determine the target geopolymer according to the performance requirements of synchronous grouting.

[0084] The material ratio determination module 400 is used to obtain the grouting material ratio according to the mineral composition and the target geopolymer.

[0085] The grouting monitoring module 500 is used to inject the grouting material into the gap between the tunnel and the formation through the tail grouting system of the shield machine after obtaining the grouting material according to the grouting material ratio, and obtain the monitoring information of surface settlement and segment floating during synchronous grouting and shield tunneling.

[0086] Figure 9 It is a structural diagram of the terminal provided by the embodiments of the present application. The terminal may include:

[0087] A memory 501, a processor 502, and a computer program stored on the memory 501 and executable on the processor 502.

[0088] When the processor 502 executes the program, it implements the sticky shield muck-based synchronous grouting utilization method provided in the above embodiments.

[0089] Further, the terminal further includes:

[0090] A communication interface 503 for communication between the memory 501 and the processor 502.

[0091] The memory 501 is used to store a computer program executable on the processor 502.

[0092] The memory 501 may include high-speed RAM memory and may also include non-volatile memory, such as at least one magnetic disk memory.

[0093] If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 can be interconnected through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 only a thick line is shown in the figure, but it does not mean that there is only one bus or one type of bus.

[0094] Optionally, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a chip, the memory 501, the processor 502, and the communication interface 503 can communicate with each other through an internal interface.

[0095] The processor 502 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0096] This embodiment also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned method for utilizing synchronous grouting based on viscous shield muck is implemented.

[0097] An embodiment of the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the method for utilizing synchronous grouting based on viscous shield muck provided in any of the embodiments corresponding to the present application Figure 1 as described in the embodiments.

[0098] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0100] Any process or method description shown in a flowchart or described in other ways herein can be understood as representing a module, segment, or portion of code including one or N executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of this application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of this application pertain.

[0101] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable storage medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable storage media include the following: an electrical connection part (electronic device) having one or N wirings, a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, a computer-readable storage medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0102] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0103] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program instructing relevant hardware. The said program can be stored in a computer-readable storage medium, and when the program is executed, it includes one or a combination of the steps of the method embodiments.

[0104] In addition, each functional unit in various embodiments of the present application may be integrated into a processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0105] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

[0106] It should be understood that the application of the present application is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description. All such improvements and transformations should fall within the protection scope of the appended claims of the present application.

[0107] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A synchronous grouting method for viscous shield slag foundation, characterized in that: The synchronous grouting utilization method of the viscous shield slag foundation comprises: Obtain the soil type and properties of the corresponding stratum of shield slag; When it is determined according to the soil type and soil property that the shield tunneling slag does not meet the fill standard, determining the mineral composition of the shield tunneling slag; Acquiring synchronous grouting performance requirements, and determining target geopolymers according to the synchronous grouting performance requirements; According to the mineral composition and the target geopolymer, a grouting material ratio is obtained; After obtaining the grouting material according to the grouting material ratio, the grouting material is injected into the gap between the tunnel and the stratum through the tail grouting system of the shield machine, and monitoring information of surface settlement and pipe segment floating is obtained during the synchronous grouting and shield excavation process; The soil type and property is fine-grained soil; The method of obtaining the soil type and soil property of the stratum corresponding to the shield slag is specifically as follows: If the soil layer corresponding to the shield slag is within the preset standard, then the stratum corresponding to the shield slag is fine-grained soil; When it is determined according to the soil type and soil property that the shield slag does not meet the fill standard, the mineral composition of the shield slag is determined, specifically: Judging whether the shield slag meets the fill standard according to the fine-grained soil, if it is judged that the shield slag does not meet the fill standard according to the fine-grained soil, performing a mineral composition test on the shield slag to obtain the mineral composition of the shield slag; The step of judging whether the shield slag meets the soil filling standard according to the fine-grained soil specifically includes: Performing a triaxial shear test on the fine-grained soil to obtain shear strength; Determining whether the shear strength reaches the strength index of the slag; If the shear strength does not reach the strength index of the slag, it is judged that the shield slag does not meet the fill standard; If the shear strength reaches the strength index of the slag, it is judged that the shield slag meets the fill standard; The method of obtaining a grouting material ratio according to the mineral composition and the target geopolymer specifically includes: According to the mineral composition and the target geopolymer, the dosage range of each raw material in the synchronous grouting is obtained; According to the dosage range of each raw material, multiple groups of material ratios are formed; Testing multiple groups of material proportions, and determining a grouting material proportion from the multiple groups of material proportions; According to the dosage range of each raw material, multiple groups of material ratios are formed, specifically including: According to the dosage range of each raw material, the response surface method is used to analyze the synergistic effect of the dosage of each raw material in the simultaneous grouting, and the multi-objective optimization method is used to analyze the slurry performance under different dosage combinations; according to the synergistic effect of the dosage of each raw material and the slurry performance under the different dosage combinations, multiple groups of material ratios are formed.

2. The synchronous grouting method for utilizing viscous shield slag foundation according to claim 1 is characterized in that: If it is determined according to the fine-grained soil that the shield slag does not meet the fill standard, a mineral composition test is performed on the shield slag to obtain the mineral composition of the shield slag, and then the method further includes: If the gravel in the mineral component does not meet the processing specification standard, the gravel is ground until the gravel meets the processing specification standard.

3. The synchronous grouting method for utilizing viscous shield slag foundation according to claim 1 is characterized in that: Determining the target geopolymer according to the synchronous grouting performance requirement specifically includes: Obtaining on-site construction requirements and geopolymer cost requirements, and selecting precursors and activators in the geopolymer according to the on-site construction requirements and the geopolymer cost requirements to obtain a plurality of different geopolymers; Conducting indoor slurry performance test on the plurality of geopolymers to obtain the test performance corresponding to each of the plurality of geopolymers; A target geopolymer is determined from the plurality of geopolymers according to the simultaneous grouting performance requirement and the plurality of test performances.

4. A synchronous grouting system for viscous shield slag foundation, characterized in that: The synchronous grouting utilization system for viscous shield slag foundation is applied to the synchronous grouting utilization method for viscous shield slag foundation according to any one of claims 1 to 3; The synchronous grouting and utilizing system for viscous shield slag foundation comprises: The stratum soil analysis module is used to obtain the soil type and properties of the stratum corresponding to the shield slag; A mineral composition determination module, for determining the mineral composition of the shield slag when it is determined that the shield slag does not meet the fill standard according to the soil type and soil property; A geopolymer determination module, used for obtaining synchronous grouting performance requirements and determining target geopolymers according to the synchronous grouting performance requirements; A material ratio determination module, used for obtaining a grouting material ratio according to the mineral composition and the target geopolymer; The grouting monitoring module is used to inject the grouting material into the gap between the tunnel and the stratum through the tail grouting system of the shield machine after obtaining the grouting material according to the grouting material ratio, and obtain monitoring information of surface settlement and pipe segment floating during the synchronous grouting and shield excavation process.

5. A terminal, characterized in that: The terminal includes: a memory, a processor, and a synchronous grouting utilization program for cohesive shield slag foundation stored in the memory and executable on the processor. When the synchronous grouting utilization program for cohesive shield slag foundation is executed by the processor, the steps of the synchronous grouting utilization method for cohesive shield slag foundation as described in any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for utilizing synchronous grouting of a viscous shield slag foundation. When the program is executed by a processor, the steps of the method for utilizing synchronous grouting of a viscous shield slag foundation as described in any one of claims 1 to 3 are implemented.

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