Integrated sip monitoring and electric eicp grouting device and control method thereof

Abstract

The present application relates to urease-induced calcium carbonate precipitation grouting technical field, especially in kind, a kind of integrated SIP monitoring and electric EICP grouting device and its control method, wherein, control method includes: determining the polarity of multiple rod electrodes, and inject EICP reactant to low permeability soil;Multiple rod electrodes are opened strong electric field, to drive electroosmosis and electromigration to realize the directional transport of EICP reactant in low permeability soil, and form acidic migration boundary and basic migration boundary;According to the preset time-sharing work and measurement mechanism, the strong electric field of multiple rod electrodes is closed, and the current calcium carbonate precipitation distribution of different rod electrodes is collected using multiple SIP monitoring equipment;According to the current calcium carbonate precipitation distribution, injection control sequence is generated, and the injection, collection and generation process are iteratively executed according to the injection control sequence until the target calcium carbonate precipitation distribution is formed. Therefore, the problems of traditional pressure grouting method, such as transport difficulty, reaction out of control and no monitoring, are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of urease-induced carbonate precipitation grouting technology, and particularly relates to a SIP (Spectrally Induced Polarization) monitoring integrated EICP (enzyme-induced carbonate precipitation) grouting device and a control method thereof. BACKGROUND

[0002] In the field of civil engineering and geological reinforcement, there are still many key technical problems to be solved in the development and application of traditional grouting technology and emerging green reinforcement technology. These problems constitute an important background for further optimization and breakthrough of related technologies.

[0003] As a historical soil reinforcement method, traditional pressure grouting technology has shown certain effectiveness in many engineering scenarios. However, when dealing with low-permeability soils such as clay and silt, its inherent limitations become increasingly apparent. Due to the small internal pore size and poor connectivity of low-permeability soils, during the traditional pressure grouting process, the grout often has difficulty penetrating deep into the soil, resulting in the accumulation of grout in local fractures and the formation of unevenly reinforced areas. More seriously, excessively high grouting pressure may even cause soil splitting, damaging the original structure of the soil and affecting the reinforcement effect and engineering safety. This series of problems not only limits the application of traditional pressure grouting technology in low-permeability soils, but also poses a serious challenge to the controllability and stability of reinforcement quality.

[0004] At the same time, the emerging green reinforcement technology—enzyme-induced carbonate precipitation technology (EICP) has gradually become a research hotspot in the field of fine-grained soil reinforcement due to its environmental friendliness and wide applicability. EICP technology achieves effective soil reinforcement by using urease to catalyze the hydrolysis of urea to produce calcium carbonate precipitation under non-biological conditions. However, in actual engineering applications, EICP technology also faces the key problem of chemical reaction control. In particular, under conventional injection methods, the diffusion and reaction process of reactants in the soil is difficult to control accurately, resulting in the formation of "wellbore plugging" phenomenon with calcium carbonate precipitation mainly concentrated near the injection port. This phenomenon not only hinders the continuous injection of subsequent reactants, but also severely limits the reinforcement depth and range, thereby restricting the reinforcement effect and engineering application potential of EICP technology.

[0005] In addition, the monitoring and control technology during construction is also a key factor affecting the grouting reinforcement quality. At present, there is a lack of high spatio-temporal resolution online monitoring means in the EICP grouting construction process, which makes it difficult for construction personnel to master the diffusion of reactants, reaction progress and distribution of calcium carbonate precipitation in the grouting process in real time. This lack of information makes the construction process have a certain blindness, and it is difficult to adjust the grouting parameters in time according to the actual situation, so as to ensure the uniform distribution of calcium carbonate precipitation and the precise realization of the engineering goal. Therefore, developing an efficient and accurate online monitoring and control system is of great significance to improve the construction quality and engineering benefit of EICP grouting technology.

[0006] In terms of optimization and innovation of grouting technology, electric transport technology, as a new emerging material transport method, has shown unique advantages and application potential. By applying an electric field, directional transport and precise control of reactants in soil can be achieved, which is expected to solve the problem of uneven diffusion of reactants under traditional injection methods. However, although electric fields have been applied in transporting reactants and pollutants, combining electric transport technology, online monitoring technology and advanced closed-loop control technology to form a complete and engineering-oriented system is still a technical problem to be solved. Especially for EICP grouting technology, how to organically integrate the precision of electric transport, the high spatio-temporal resolution of online monitoring and the intelligence of PINN-MPC based on physical information neural network model prediction control (PINN-MPC), and build an efficient, stable and controllable grouting reinforcement system, is the research frontier and hotspot in the field of civil engineering and geological reinforcement.

[0007] In summary, the application limitations of traditional pressure grouting technology in low permeability soil, the "wellhead blockage" problem of EICP technology under conventional injection method, the lack of high spatio-temporal resolution online monitoring and control means during construction, and the integration and application difficulties of electric transport, online monitoring and closed-loop control technology, together constitute the key technical bottlenecks that need to be broken through in the field of grouting reinforcement technology. SUMMARY

[0008] The present application provides an integrated SIP monitoring and electric EICP grouting device and its control method to solve the problems of transport difficulty, reaction out of control and lack of monitoring in traditional pressure grouting method, so that the EICP reactants can be controllably transported to the target area in low permeability soil, the reaction can be triggered on demand, the precipitation distribution can be monitored online in real time, and the control parameters can be optimized by AI in real time, thereby realizing uniform, verifiable and energy-saving in-situ reinforcement.

[0009] The first aspect of the present application provides an integrated SIP monitoring and electric EICP grouting device, comprising: a plurality of rod electrodes arranged in a quincunx or rectangular array vertically in a plurality of target injection wells, and each rod electrode is coaxially sleeved with a grouting pipeline in the corresponding target injection well, for applying a direct current driving electric field and injecting multi-frequency alternating current into the target injection well; a plurality of SIP monitoring devices, each SIP monitoring device is connected with a rod electrode, for monitoring the calcium carbonate precipitation distribution of underground medium under different frequency alternating current through the plurality of rod electrodes; a urea solution storage tank connected with the grouting pipeline in the target injection well, for storing urea solution; a calcium chloride solution storage tank connected with the grouting pipeline in the target injection well, for storing calcium chloride solution; a urease solution storage tank connected with the grouting pipeline in the target injection well, for storing urease solution; a grouting pump connected with the urea solution storage tank, the calcium chloride solution storage tank and the urease solution storage tank, for injecting the urea solution, the calcium chloride solution and the urease solution into the low permeability soil; a controller connected with the grouting pump, the plurality of rod electrodes, the plurality of SIP monitoring devices, the urea solution storage tank, the calcium chloride solution storage tank and the urease solution storage tank, for controlling the grouting pump to inject urea solution, calcium chloride solution and urease solution into the plurality of grouting pipelines, and the plurality of rod electrodes to release multi-frequency alternating current, so as to collect the calcium carbonate precipitation distribution of different rod electrodes, and generate an injection control sequence according to the calcium carbonate precipitation distribution of different rod electrodes, and iteratively execute the injection, collection and generation processes according to the injection control sequence, until the target calcium carbonate precipitation distribution is produced.

[0010] Optionally, the coaxial sleeve of each rod electrode and the grouting pipeline is configured to allow the application of an electric field to the urea solution, the calcium chloride solution and the urease solution at the injection point while injecting the urea solution, the calcium chloride solution and the urease solution into the low permeability soil.

[0011] Optionally, the electrode configured as an anode in the plurality of rod electrodes is provided with a titanium substrate coated with a noble metal oxide coating.

[0012] The second aspect of the present application provides a control method of an integrated SIP monitoring and electric EICP grouting device, comprising the following steps:

[0013] determining polarities of the plurality of rod electrodes, and injecting urea solution, calcium chloride solution and urease solution into the low-permeability soil; turning on a strong electric field of the plurality of rod electrodes to drive electroosmosis and electromigration to realize directional transport of EICP reactants in the low-permeability soil, and to electrolyze water at anodes and cathodes to form an acid migration boundary and an alkaline migration boundary; inhibiting urease activity in a grouting port area by using the acid migration boundary, and triggering the urease activity in a predetermined target area by using the alkaline migration boundary; turning off the strong electric field of the plurality of rod electrodes according to a preset time-sharing working and measuring mechanism, collecting current calcium carbonate precipitation distribution maps of different rod electrodes by using a plurality of SIP monitoring devices; generating an injection control sequence according to the current calcium carbonate precipitation distribution maps, and iteratively performing the injection, collection and generation processes according to the injection control sequence until a target calcium carbonate precipitation distribution is produced, and stopping injection and power supply.

[0014] Optionally, the determining polarities of the plurality of rod electrodes, and injecting urea solution, calcium chloride solution and urease solution into the plurality of grouting pipelines comprises:

[0015] determining that each rod electrode in the plurality of rod electrodes is an anode or a cathode; in the case that any rod electrode is an anode, injecting the urea solution and the calcium chloride solution into a grouting pipeline corresponding to the rod electrode; and in the case that any rod electrode is a cathode, injecting the urease solution into a grouting pipeline corresponding to the rod electrode.

[0016] Optionally, the turning on a strong electric field of the plurality of rod electrodes to drive electroosmosis and electromigration to realize directional transport of EICP reactants in the low-permeability soil comprises:

[0017] turning on a strong electric field of the plurality of rod electrodes, under the action of the strong electric field, causing Ca 2+ ions to move together with urea molecules of the urea solution by electromigration and electroosmotic flow in the direction of cathode rod electrodes, causing urease molecules of the urease solution in the cathode rod electrodes to move by electrophoresis in the direction of anode rod electrodes; and the anode rod electrodes and the cathode rod electrodes meet in a target area and react to generate calcium carbonate precipitation.

[0018] Optionally, the preset time-sharing working and measuring mechanism is that, after the plurality of rod electrodes are turned on a strong electric field, the strong electric field is instantaneously paused in a preset silent window, and the plurality of SIP monitoring devices are controlled to complete a re-conductivity measurement in a current window.

[0019] Optionally, the injection control sequence is generated according to the current calcium carbonate precipitation distribution map, and the injection, collection and generation processes are iteratively performed according to the injection control sequence until a target calcium carbonate precipitation distribution is formed, and the injection and power supply are stopped, comprising:

[0020] The current calcium carbonate precipitation distribution map is compared with the calcium carbonate precipitation distribution map at the last time to obtain a difference value; the future evolution process of the current calcium carbonate precipitation distribution is predicted according to the difference value based on a model predictive control algorithm and a physical information neural network, and an optimization problem with constraints is solved online according to the future evolution process of the current calcium carbonate precipitation distribution, so as to generate the injection control sequence, the optimization problem aiming to minimize the reagent cost and minimize the difference between the reinforcement effect and the target; the injection, collection and generation processes are iteratively performed according to the injection control sequence until the current calcium carbonate precipitation distribution map reaches the target calcium carbonate precipitation distribution, and the injection of the urea solution, the calcium chloride solution and the urease solution into the multiple grouting pipelines and the power supply to the multiple rod-shaped electrodes are stopped.

[0021] The third aspect of the present application provides a control system integrating SIP monitoring and electric EICP grouting device, comprising: a grouting module for determining the polarity of a plurality of rod-shaped electrodes and injecting urea solution, calcium chloride solution and urease solution into low-permeability soil; a charge guiding module for turning on a strong electric field of the plurality of rod-shaped electrodes to drive electroosmosis and electromigration to realize the directional transport of EICP reactants in the low-permeability soil, and electrolyze water at anode and cathode to form an acidic migration boundary and an alkaline migration boundary; an inhibition and triggering module for inhibiting urease activity in the grouting port area by using the acidic migration boundary and triggering the urease activity in the predetermined target area by using the alkaline migration boundary; a monitoring module for turning off the strong electric field of the plurality of rod-shaped electrodes according to a preset time-sharing working and measuring mechanism, and collecting the current calcium carbonate precipitation distribution map of different rod-shaped electrodes by using a plurality of SIP monitoring devices; a generation and iteration module for generating an injection control sequence according to the current calcium carbonate precipitation distribution map, and iteratively performing the injection, collection and generation processes according to the injection control sequence until a target calcium carbonate precipitation distribution is formed, and the injection and power supply are stopped.

[0022] The fourth aspect of the present application provides an electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to realize the control method of the integrated SIP monitoring and electric EICP grouting device as described in the above embodiments.

[0023] The integrated SIP monitoring and electric EICP grouting device and the control method thereof provided by the embodiment of the present application fundamentally solve the physical transportation bottleneck, so that uniform reinforcement of fine-grained soil such as clay, which was considered to be "ungroutable" in the past, becomes possible; the "pH front" generated by electrolytic water in the electric transportation process is transformed from an associated phenomenon into a kind of spatiotemporal trigger for accurately controlling the EICP chemical reaction, that is, the acid front generated by the anode and the alkali front generated by the cathode are used in dual functions: the low-pH environment of the anode acid front actively inhibits the urease activity near the grouting port, thereby fundamentally solving the "well mouth blockage" problem, at the same time, the high-pH environment of the alkali front migrating to the anode triggers the urease activity "on demand" in the target area, realizing the "fixed-point" precipitation of calcium carbonate, realizing the "on-demand" triggering and "fixed-point" precipitation of the chemical reaction, effectively avoiding the well mouth blockage, and ensuring the uniformity and high quality of the reinforcement; a complete closed-loop system integrating high spatiotemporal resolution SIP monitoring and artificial intelligence control is constructed, the system forms a "perception-prediction-optimization-execution" cycle, high-resolution spectral induced polarization (SIP) is taken as real-time input and is sent into an advanced artificial intelligence model based on physical information neural network (PINN) and model predictive control (MPC), so as to realize active and intelligent management of underground geochemical processes, make the underground chemical process real-time visible, and completely change the status of "blind construction" of traditional grouting engineering, thereby providing a direct basis for process control and quality assurance; the online optimization capability ensures that the energy consumption and the amount of expensive reagents (especially urease) are minimized on the premise of meeting the engineering target, thereby significantly reducing the engineering cost; the whole closed-loop system can actively adapt to the heterogeneity and uncertainty of the underground environment, continuously correct the control strategy, and ensure the reliability and repeatability of the reinforcement effect under real complex working conditions.

[0024] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 A structural schematic diagram of an integrated SIP monitoring and electric EICP grouting device provided according to an embodiment of the present application;

[0027] Figure 2 A specific structural schematic diagram of an integrated SIP monitoring and electric EICP grouting device provided according to an embodiment of the present application;

[0028] Figure 3A working principle diagram of an integrated SIP monitoring and electric EICP grouting device according to an embodiment of the present application is provided.

[0029] Figure 4 A flowchart of a control method of an integrated SIP monitoring and electric EICP grouting device according to an embodiment of the present application is provided.

[0030] Figure 5 A settling principle diagram of a control method of an integrated SIP monitoring and electric EICP grouting device according to an embodiment of the present application is provided.

[0031] Figure 6 A block diagram of a control system of an integrated SIP monitoring and electric EICP grouting device according to an embodiment of the present application is provided.

[0032] Figure 7 A structural diagram of an electronic device according to an embodiment of the present application is provided.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 10 - integrated SIP monitoring and electric EICP grouting device, 101 - rod-shaped electrode, 1011 - rod-shaped anode, 1012 - rod-shaped cathode, 102 - SIP monitoring device, 103 - urea solution storage tank, 104 - calcium chloride solution storage tank, 105 - urease solution storage tank, 106 - grouting pump, and 107 - controller. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or elements having the same or similar function throughout the several figures. The embodiments described below are examples and are intended to explain the present application, and are not intended to limit the present application.

[0036] An integrated SIP monitoring and electric EICP grouting device and a control method thereof according to an embodiment of the present application are described below with reference to the attached drawings.

[0037] Figure 1 An integrated SIP monitoring and electric EICP grouting device according to an embodiment of the present application is provided.

[0038] As shown in FIG. 1, Figure 1 the integrated SIP monitoring and electric EICP grouting device 10 includes a plurality of rod-shaped electrodes 101, a plurality of SIP monitoring devices 102, a urea solution storage tank 103, a calcium chloride solution storage tank 104, a urease solution storage tank 105, a grouting pump 106, and a controller 107.

[0039] The SIP monitoring device 102 is connected with the rod-shaped electrode 101, and is used for monitoring the calcium carbonate precipitation distribution of the underground medium under different frequency alternating currents through the plurality of rod-shaped electrodes 101. The urea solution storage tank 103 is connected with the grouting pipeline in the target injection well, and is used for storing the urea solution. The calcium chloride solution storage tank 104 is connected with the grouting pipeline in the target injection well, and is used for storing the calcium chloride solution. The urease solution storage tank 105 is connected with the grouting pipeline in the target injection well, and is used for storing the urease solution. The grouting pump 106 is connected with the urea solution storage tank 103, the calcium chloride solution storage tank 104 and the urease solution storage tank 105, and is used for injecting the urea solution, the calcium chloride solution and the urease solution into the low-permeability soil. The controller 107 is connected with the grouting pump 106, the plurality of rod-shaped electrodes 101, the plurality of SIP monitoring devices 102, the urea solution storage tank 103, the calcium chloride solution storage tank 104 and the urease solution storage tank 105, respectively, and is used for controlling the grouting pump 106 to inject the urea solution, the calcium chloride solution and the urease solution into the plurality of grouting pipelines, and controlling the plurality of rod-shaped electrodes 101 to release the multi-frequency alternating current, so as to collect the calcium carbonate precipitation distribution of different rod-shaped electrodes 101, and generate an injection control sequence according to the calcium carbonate precipitation distribution of different rod-shaped electrodes 101, and iteratively execute the injection, collection and generation processes according to the injection control sequence, until the target calcium carbonate precipitation distribution is formed.

[0040] Specifically, the rod-shaped electrode 101 well in the embodiment of the present application is not only a structure for placing an electrode, but also a composite unit integrating the functions of electrode installation and reagent injection. In the traditional grouting, the grouting pipe is independent. However, in the electrokinetic transport system of the embodiment of the present application, it is necessary to ensure that the electric field can produce force on the reagent molecules and ions from the injection point, and it is the most efficient implementation to integrate the grouting function and the electrode into one, that is, the grouting pipeline is usually arranged coaxially with the electrode well, that is, the coaxial connection of each rod-shaped electrode 104 and the grouting pipeline is configured to allow the urea solution, the calcium chloride solution and the urease solution to be injected into the low-permeability soil while the electric field is applied to the urea solution, the calcium chloride solution and the urease solution at the injection point, so as to ensure the seamless connection of the electric field driving force and the chemical reagents.

[0041] For example, a thin grouting pipe can extend downward along the center of the electrode well, and the outlet of the grouting pipe is located in the electrode well. When the grouting pump 106 is started, the reagent (such as the CaCl2 and urea solution in the anode well) is transported into the electrode well through the grouting pipe, and fills the conductive medium area in the well composed of bentonite or graphite particles. Since the rod-shaped electrode 101 (such as the anode rod) is also located in this reagent-filled conductive medium, the applied electric field can immediately act on the just-injected Ca 2+Ions and pore fluids efficiently drive them out of the porous well wall and migrate toward the target soil region.

[0042] Therefore, in the embodiments of the present invention, the "electrode well", "injection well" and "grouting hole" are physically integrated. This integrated design ensures the seamless connection between the electric field driving force and the chemical reagent, which is a prerequisite for achieving efficient electric transport.

[0043] Furthermore, such as Figure 2 As shown, the rod-shaped anode 1011 is exposed to a highly acidic (low pH) and highly oxidizing environment, which is extremely corrosive. Therefore, a corrosion-resistant material must be used. A preferred option is to use chemically stable titanium as the substrate and coat its surface with a layer of noble metal oxide, such as iridium oxide, to resist corrosion from the highly acidic environment generated by water electrolysis. This material selection is not conventional engineering practice, but rather a response to the highly acidic corrosive environment (2H₂O-4e⁻) generated by the pH triggering mechanism itself in this embodiment of the invention. - →O2↑+4H + The targeted design made is a key technical guarantee for the realization of the entire system. The rod-shaped cathode 1012 is in an alkaline environment, so the corrosion problem is relatively minor. Materials with good conductivity and higher cost-effectiveness can be selected, such as stainless steel mesh or graphite electrodes.

[0044] Multiple rod-shaped electrodes 101 are designed and laid out according to engineering objectives. For example, to reinforce the foundation, vertical rod-shaped electrodes 101 can be arranged in a quincunx or rectangular array; to construct a vertical seepage barrier, two rows of parallel vertical electrode arrays can be used. The electrode spacing is a key design parameter. The controller 107 can dynamically activate or deactivate certain rod-shaped electrodes in the array and switch the polarity of the rod-shaped electrodes based on real-time monitoring data, actively optimizing the electric field configuration to replace traditional high-pressure hydraulic drive.

[0045] Furthermore, holes are drilled near each rod electrode 101 to serve as monitoring holes for the SIP monitoring device 102. The SIP monitoring device 102 is lowered to a predetermined depth at the corresponding monitoring hole via a cable and connected to the corresponding rod electrode 101 via a cable, thereby monitoring the complex conductivity of the underground medium under different frequency alternating currents.

[0046] Furthermore, such as Figure 3As shown, the controller 107 is embedded with the control method of the integrated SIP monitoring and electrokinetic EICP grouting device described below. In addition to controlling the on-off of each rod electrode 101, multiple SIP monitoring devices 102, urea solution storage tank 103, calcium chloride solution storage tank 104, urease solution storage tank 105, grouting pump 106, and the polarity of the rod electrode 101, the control method also realizes the directional transport of EICP reactants in low permeability soil through electric field driven electroosmosis and electromigration. The acid / base front (pH front) generated around the electrode by electrolysis is used as a spatiotemporal triggering mechanism to inhibit or start local reactions, i.e., the anode acid front inhibits wellhead reactions, and the cathode base front starts reactions "on demand" in the target area, fundamentally solving the "wellhead plugging" problem in traditional EICP grouting. High spatiotemporal resolution SIP monitoring technology is used to obtain underground complex conductivity changes and real-time underground calcium carbonate precipitation distribution through inversion. An internal model based on a physical information neural network (PINN) is also configured, and a model predictive control (MPC) algorithm is used to optimize control instructions (voltage, current, grouting flow rate, and injection timing, etc.) online. According to the real-time collected calcium carbonate precipitation distribution, the optimal injection control sequence is predicted and optimized online in advance, forming a closed-loop control iteration execution closed-loop process of "execution-sensing-prediction-optimization-re-execution", until the target calcium carbonate precipitation distribution is formed.

[0047] It should be noted that the process of "time-sharing work" and the implementation of the measurement mechanism is as follows:

[0048] To solve the problem of interference of strong direct current (DC) electric field used to drive material transport on weak alternating current (AC) signal used for SIP measurement, the embodiment of the present application adopts a "time-sharing work" or "duty cycle measurement" mechanism. The mechanism divides the entire process into a high-frequency repeating cycle, each cycle containing two distinct stages:

[0049] Transport stage: In this stage, the controller 107 applies a strong direct current electric field to the grouting electrode for several seconds to several minutes to efficiently drive the electromigration of ions and the electroosmotic transport of fluid.

[0050] Measurement stage: After the transport stage, the controller 107 instantaneously suspends the direct current electric field, thereby creating a "silent window" of about 10-100 milliseconds. During this short silent window, the interference of strong direct current field disappears, and the SIP monitoring device immediately injects a weak multi-frequency alternating current signal (e.g., a sweep signal from 1 mHz to 20 kHz) into the dedicated monitoring electrode pair and quickly completes a full-field complex conductivity measurement.

[0051] This "grouting-pause-measurement" cycle is repeated at a high frequency, which effectively avoids the interference of the driving field on the measurement signal, and at the same time realizes the quasi-real-time process monitoring of the underground chemical process, providing solid technical support for the claim of "millisecond-level response".

[0052] Further, to realize intelligent and adaptive control of complex underground processes, the controller 107 of the embodiment of the present application is embedded with an advanced algorithm framework based on a physical information neural network (PINN) and model predictive control (MPC). This framework overcomes the difficulty of traditional control methods relying on accurate mathematical models, and can handle the problems of data sparsity and environmental heterogeneity commonly existing in underground engineering. Among them, the physical information neural network (PINN) is used as a digital twin model. PINN is a deep learning method that directly embeds physical laws as constraints into the training process. In the embodiment of the present application, PINN is used as a "digital twin" model that can be updated in real time. The loss function of PINN includes not only a data-driven term (the difference between model prediction and SIP measurement value), but also a physical constraint term representing the following known physical laws (expressed in the form of partial differential equations):

[0053] Ion transport equation: Nernst-Planck equation is used to describe the electromigration and diffusion process of key ions such as Ca 2+ , Cl - , NH4 + under the joint action of electric field gradient and concentration gradient.

[0054] Fluid flow equation: modified Darcy's Law containing electroosmotic driving term is used to describe the overall motion of pore fluid under hydraulic gradient and electric potential gradient.

[0055] Geochemical reaction kinetics equation: Michaelis-Menten kinetics describing urease catalyzed hydrolysis of urea and reaction rate equation of CaCO3 precipitation are included, and pH evolution equation is coupled.

[0056] Rock physics model: a mathematical model (for example, a model based on interfacial polarization theory) is established to describe the relationship between CaCO3 precipitation and SIP measured conductivity imaginary part σ'', which links geochemical changes and geophysical responses.

[0057] PINN can use these physical laws to constrain the solution space, generating physically reasonable interpolation and prediction even in areas with sparse SIP sensor data, thereby constructing a high-fidelity real-time estimator of underground state.

[0058] Further, Model Predictive Control (MPC) is used as the core of the optimization decision, which is an advanced process control strategy. The core of MPC is "model-based prediction" and "rolling horizon optimization". In the context of the present application, the key elements of the MPC framework are defined as follows:

[0059] State Variables: Parameters describing the current state of the system, i.e. the concentration field of reactants and the three-dimensional distribution field of CaCO3 precipitates in space.

[0060] Control Inputs: Variables that can be adjusted by the controller 107, i.e. the voltage / current values applied to each electrode, and the injection flow rate and timing of each reagent.

[0061] Objective Function: A mathematical expression that needs to be minimized, which can be in the form of: J = w 1(能耗成本) +w2• (试剂成本) +w3||CaCO 3,实际 -CaCO 3,目标 || 2 , where w is the weight coefficient of each term, and the second term represents the difference between the current precipitation distribution and the final engineering goal.

[0062] Constraints: Physical and operational limitations of the system, such as maximum allowed voltage, maximum pump speed, total budget cost, non-negative concentration, etc.

[0063] In each control cycle, MPC uses the updated PINN model to predict the future evolution of the system state caused by different control input sequences, then solves an optimization problem online to calculate the optimal control sequence that minimizes the objective function value in the future period of time while satisfying all constraints. The controller 107 then only executes the first action of the sequence and repeats the entire process at the next time step.

[0064] In summary, the integrated SIP monitoring and electric EICP grouting device according to the embodiments of the present application has the following beneficial effects:

[0065] (1) Break the forbidden zone and achieve effective reinforcement: fundamentally solve the physical transport bottleneck, making it possible to uniformly reinforce fine-grained soils such as clay that were previously considered "ungroutable";

[0066] (2) Precise control to ensure reinforcement quality: by controlling the pH front through the electric field, "on-demand" triggering and "point" precipitation of chemical reactions are achieved, effectively avoiding wellhead blockage and ensuring the uniformity and high quality of the reinforcement body;

[0067] (3) Process visible, ensure the reliability of the project: let the underground chemical process real-time visible, completely changed the "blind construction" of the status quo, for process control and quality assurance provides a direct basis;

[0068] (4) Intelligent optimization, improve economic efficiency: online optimization capability, ensures that in the premise of meeting the project goal, energy consumption and the use of expensive reagent (especially urease) minimization, significantly reduce the project cost;

[0069] (5) Strong adaptability, complex working conditions: the whole closed loop system can actively adapt to the heterogeneity and uncertainty of the underground environment, continuously correct the control strategy, ensure the reliability and repeatability of the reinforcement effect under real complex working conditions.

[0070] Figure 4 The flowchart of the control method of the integrated SIP monitoring and electric EICP grouting device provided by the embodiment of the application.

[0071] As Figure 4 shown, the control method of the integrated SIP monitoring and electric EICP grouting device includes the following steps:

[0072] In step S401, the polarity of the plurality of rod electrodes is determined, and urea solution, calcium chloride solution and urease solution are injected into the low permeability soil.

[0073] In some embodiments, the polarity of the plurality of rod electrodes is determined, and urea solution, calcium chloride solution and urease solution are injected into the plurality of grouting pipelines, comprising:

[0074] Determining that each rod electrode in the plurality of rod electrodes is an anode or a cathode;

[0075] In the case where any rod electrode is an anode, urea solution and calcium chloride solution are injected into the grouting pipeline corresponding to the rod electrode;

[0076] In the case where any rod electrode is a cathode, urease solution is injected into the grouting pipeline corresponding to the rod electrode.

[0077] In step S402, a strong electric field of the plurality of rod electrodes is turned on to drive electroosmosis and electromigration to realize the directional transport of EICP reactants in the low permeability soil, and to electrolyze water at the anode and the cathode using the strong electric field to form an acid migration boundary and an alkaline migration boundary.

[0078] In step S403, the acid migration boundary is used to inhibit the urease activity in the grouting port area, and the alkaline migration boundary is used to trigger the urease activity in the predetermined target area.

[0079] In some embodiments, a strong electric field is activated on multiple rod-shaped electrodes to drive electroosmosis and electromigration to achieve directional transport of EICP reactants in low-permeability soil, including:

[0080] A strong electric field is applied to multiple rod-shaped electrodes. Under the influence of this strong electric field, the Ca2+ concentration in the calcium chloride solution at the anode rod-shaped electrode increases. 2+ Ions move toward the cathode rod electrode via electromigration, and urea molecules in the urea solution move toward the anode rod electrode via electroosmosis.

[0081] The target region between the anode rod electrode and the cathode rod electrode meets and undergoes an EICP reaction to generate calcium carbonate precipitate.

[0082] In actual implementation, the initial chemical formulation can be 1M urea, 0.67M calcium chloride, and 3g / L urease. For highly plastic clays, a small amount (e.g., 0.75%) of lignin additive can be added to the EICP system to improve the brittleness of the solidified soil.

[0083] Furthermore, such as Figure 5 As shown, in this embodiment of the invention, after determining the polarity of multiple rod-shaped electrodes according to the requirements of the target engineering project, a bidirectional counter-impact injection strategy utilizing the electro-transport characteristics is employed. A mixed solution of calcium chloride and urea is injected at the anode, and under an electric field, Ca... 2+ Ions move toward the cathode via electromigration, and urea molecules move toward the cathode via electroosmosis. Free urease solution is injected into the cathode. In the natural pH environment of most soils, urease molecules carry a net negative charge, so they move toward the anode via electrophoresis in the electric field. When all reactants move toward each other from both ends, they eventually meet in the target area between the electrodes and undergo an EICP reaction, realizing the spatial separation of reactant transport and reaction triggering, and generating calcium carbonate precipitate.

[0084] Furthermore, in this embodiment of the invention, a time-phased pulse injection of chemical reagents can be used, which can be combined with the switching of the electric field or the periodic reversal of the electrode polarity to achieve precise "beat-like" control of the reaction process.

[0085] It is noted that electroosmosis refers to: Clay particles usually have a net negative charge on the surface, which can adsorb cations in pore water, forming an interface region called "diffuse double layer" (EDL). This region is positively charged as a whole. Under the action of an external electric field, this positively charged hydration ion layer will move as a whole to the cathode (negative electrode) direction, and like a micro-piston, it will drag the surrounding free water molecules to move together, thus forming a macroscopic water flow from the anode to the cathode. Electroosmotic flow is the main way to drive the transport of neutral molecules (such as urease) and the entire pore fluid. Its most critical feature is that the electroosmotic flow rate is proportional to the voltage gradient, but it is basically independent of the permeability coefficient of the soil, which is the fundamental reason why it can achieve efficient fluid transport in clay with extremely low permeability.

[0086] Electromigration refers to: This is the directional movement phenomenon of charged ions under the action of electric field force. Positively charged cations (such as calcium ions Ca 2+ , ammonium ions NH 4+ produced by urea hydrolysis) will move to the cathode, while negatively charged anions (such as chloride ions Cl - ) will move to the anode. Electromigration is the main transport method of ion components (especially Ca 2+ ) in low-permeability media, and its speed is much higher than that of pure diffusion.

[0087] In the process of electroosmosis and electromigration, the by-products (pH changes) that are inevitable in the electrolysis process can be converted into the core tool for controlling the EICP reaction, as follows:

[0088] Formation and use of pH front: Under the action of a direct current electric field, water electrolysis will occur at the electrode:

[0089] Anode reaction: 2H2O-4e - →O2↑+4H +

[0090] Cathode reaction: 2H2O+2e - →H2↑+2OH -

[0091] H + ions produced at the anode form an "acid front" moving towards the cathode, while OH - ions produced at the cathode form a "base front" moving towards the anode. The core catalyst of the EICP reaction, urease, is highly sensitive to pH, and its optimal pH range is usually between 8.0 and 9.0.

[0092] In the transportation stage, the reactants are delivered to the target region, where the pH environment is not conducive to the reaction. However, based on the time-sharing work and measurement mechanism, the moving speed and range of the "alkali front" can be accurately controlled by adjusting the electric field intensity of the rod-shaped electrode. When the reactants arrive at the target region, the "alkali front" is instructed to reach the target region, so that the local pH value is rapidly increased to the optimal range, thereby instantaneously "triggering" the EICP reaction. At the same time, the "acid front" generated by the anode can effectively inhibit the enzyme activity in the region near the grouting port, thereby fundamentally solving the "well mouth blockage" problem.

[0093] In step S404, the strong electric fields of the plurality of rod-shaped electrodes are turned off according to the preset time-sharing work and measurement mechanism, and the current calcium carbonate precipitation distribution of each rod-shaped electrode is collected by using the plurality of SIP monitoring devices.

[0094] It should be noted that the SIP monitoring device measures the complex conductivity σ* = σ' + iσ'' of the underground medium under different frequency alternating currents. The real part σ' represents the conductivity, and the imaginary part σ'' (or the phase angle related thereto) represents the polarization or charge storage capacity of the medium, which is extremely sensitive to the chemical changes occurring at the mineral particle-pore fluid interface.

[0095] Tracking ion transport: When the Ca 2+ When the CaCO3 crystal precipitates on the surface of the soil particle, a large number of new mineral-fluid interfaces are formed, which greatly increases the total polarization surface area, resulting in a significant and positive correlation between the increase of σ'' and the amount of precipitation. Therefore, the increase distribution of σ'' is the precipitation distribution of calcium carbonate, which can directly reflect the expansion of the precipitation region and the accumulation of the precipitation amount.

[0096] Detecting mineral precipitation: When the CaCO3 crystal precipitates on the surface of the soil particle, a large number of new mineral-fluid interfaces are formed, which greatly increases the total polarization surface area, resulting in a significant and positive correlation between the increase of σ'' and the amount of precipitation. Therefore, the increase distribution of σ'' is the precipitation distribution of calcium carbonate, which can directly reflect the expansion of the precipitation region and the accumulation of the precipitation amount.

[0097] In actual implementation, the SIP monitoring device used by the embodiment of the present application is not a single-point sensor, but a geophysical tomography system, which works similarly to a medical CT scan and can non-invasively "see through" the interior of the grouting region.

[0098] Hardware configuration: An array composed of dozens of non-polarizable electrodes (such as Ag / AgCl electrodes) is used, which are strategically arranged in the dedicated monitoring holes on the periphery or inside of the region to be reinforced, and are physically isolated from the high-power grouting electrodes. The measurement is performed on a wide frequency band (such as 1 mHz to 20 kHz).

[0099] Time-sharing working and measurement mechanism: In order to avoid the interference of strong electric field on weak signal, the time-sharing working mode is adopted. Specifically, in the millisecond-level "grouting phase", the strong electric field is turned on, and in the subsequent preset "quiet window", the strong electric field is temporarily suspended, and the SIP monitoring device completes a complex conductivity measurement in the current window. The cycle of "grouting-suspension-measurement" is repeated at a high frequency to realize quasi-real-time monitoring. The preset "quiet window" is generally 10 to 100 milliseconds.

[0100] Multi-angle observation and data acquisition: In a "snapshot" measurement, a pair of electrodes is automatically selected as the current transmitting end to inject weak multi-frequency alternating current into the ground; at the same time, all other electrode pairs are used as voltage receiving ends to measure the potential difference and phase shift. During the whole control process, different electrode pairs are quickly switched as the transmitting end to repeat the process, so as to complete hundreds of times of measurements covering different paths in a short time.

[0101] Inversion imaging: The massive raw data collected are processed by using a complex mathematical inversion algorithm, which can reconstruct the two-dimensional or three-dimensional distribution map of σ'' value in the entire reinforcement area according to the measured electrical response on the boundary, i.e. the calcium carbonate precipitation distribution map. This map is a kind of "X-ray" of the underground chemical process, which provides the necessary, rich and comprehensive spatial information for subsequent intelligent control.

[0102] In step S405, an injection control sequence is generated according to the current calcium carbonate precipitation distribution map, and the injection, acquisition and generation processes are iteratively performed according to the injection control sequence until the target calcium carbonate precipitation distribution is formed, and the injection and power supply are stopped.

[0103] In some embodiments, the injection control sequence is generated according to the current calcium carbonate precipitation distribution map, and the injection, acquisition and generation processes are iteratively performed according to the injection control sequence until the target calcium carbonate precipitation distribution is formed, and the injection and power supply are stopped, including:

[0104] Comparing the current calcium carbonate precipitation distribution map with the calcium carbonate precipitation distribution map at the last time to obtain a difference value;

[0105] Based on the model predictive control algorithm and the physical information neural network, the future evolution process of the current calcium carbonate precipitation distribution is predicted according to the difference value, and an optimization problem with constraints is solved online to generate the injection control sequence, with the objective of minimizing the reagent cost and minimizing the difference between the reinforcement effect and the target.

[0106] The injection, collection and generation processes are iteratively performed according to the injection control sequence until the current calcium carbonate precipitation distribution reaches the target calcium carbonate precipitation distribution, the injection of the urea solution, the calcium chloride solution and the urease solution into the plurality of grouting pipelines is stopped, and the power supply to the plurality of rod-shaped electrodes is stopped.

[0107] In actual execution, the embodiment of the application adopts a model predictive control algorithm MPC as its top-level control strategy, wherein the MPC is an advanced process control algorithm, and the core idea of its "model-based prediction" and "rolling horizon optimization" makes it particularly suitable for processing complex systems like underground grouting, which has characteristics such as multivariable, large time delay, multiple constraints and nonlinearity. The foresight of MPC enables it to make better global decisions and can explicitly handle various physical and operational constraints (such as maximum voltage, total cost, etc.).

[0108] Further, on the basis of the model predictive control algorithm MPC, the embodiment of the application also adopts a physical information neural network PINN as its internal process model to overcome the problem that traditional MPC relies on accurate mathematical models. The PINN is a deep learning method that directly embeds physical laws as constraints into the training process, and its loss function includes not only a data-driven term (the difference between model predictions and sensor measurements), but also a physical constraint term, which represents the residual of known control equations (partial differential equations).

[0109] In the embodiment of the application, the training of the PINN will be constrained by the following physical laws:

[0110] (1) Flow and transport equations: describe the coupled flow of electroosmosis and electromigration, as well as the convection-dispersion-reaction process of each chemical component in the porous medium.

[0111] (2) Geochemical reaction kinetics: describe the reaction rates of urease catalysis and calcium carbonate precipitation, as well as the evolution of pH.

[0112] (3) Rock physics model: describes the mathematical model of the relationship between the amount of calcium carbonate precipitation and the geophysical parameters (such as σ'' measured by SIP).

[0113] (3) The biggest advantage of PINN is that it can use physical laws to constrain the solution space, even in areas where sensor data is sparse, it can generate physically reasonable interpolation and prediction, which is very suitable for data-sparse and complex system applications in underground engineering.

[0114] Therefore, the embodiment of the application based on the model predictive control algorithm MPC and the physical information neural network PINN can form a closed-loop control of "execution-sensing-prediction-optimization-re-execution", and the working process of the closed loop is as follows:

[0115] Perceive: Collect the full-field complex conductivity data in the “quiet window” by multiple SIP monitoring devices to generate the current calcium carbonate precipitation distribution map.

[0116] Estimate: Fuse the latest SIP measurements with the PINN model predictions by using data assimilation techniques such as Kalman filter to calculate the optimal estimate of the subsurface state (ion concentration field, precipitate distribution field) and real-time correct the internal “digital twin” model.

[0117] Predict & Optimize: The MPC uses the updated PINN model to predict the future results caused by different control strategies (such as adjusting the voltage) forward. Then, solve an optimization problem online to calculate the optimal control sequence that can achieve the engineering goal at the lowest cost.

[0118] Execute: Only execute the first control action of the optimal sequence (for example, “raise the voltage of A1 anode by 5V”), and then enter the next cycle to start perceiving again, so as to realize the continuous self-adaptation to the subsurface changes until the current calcium carbonate precipitation distribution map reaches the target calcium carbonate precipitation distribution, stop injecting urea solution, calcium chloride solution and urease solution into the multiple grouting pipes, and stop supplying power to the multiple rod-shaped electrodes.

[0119] The inputs and outputs of the controller are defined as follows:

[0120] Main inputs: Virtual conductivity three-dimensional image (σ''(f,x,y,z,t)) from SIP monitoring devices, system total voltage and total current from power supply unit, reagent injection rate from grouting pump.

[0121] Main outputs (control instructions): Voltage / current set value of each electrode, reagent injection rate and concentration set value of each injection well, electrode polarity reversal instruction.

[0122] The control method of the integrated SIP monitoring and electric EICP grouting device proposed in the embodiments of the present application is described in detail below through a specific embodiment.

[0123] First step: Site survey and system design (pre-construction preparation)

[0124] Geological survey: First, conduct a standard geotechnical engineering survey of the site to be reinforced to determine the range (length, width, depth), soil distribution, soil physical and mechanical properties (such as water content, void ratio, permeability coefficient, etc.) and groundwater conditions of the target reinforcement area.

[0125] Design: Based on the survey results and engineering objectives (e.g., is it to improve the bearing capacity of the foundation or to construct a seepage prevention curtain), systematic design is carried out. The design content includes:

[0126] Electrode array layout: Determine the number, spacing, and arrangement of anodes and cathodes. For example, to reinforce a square foundation, 4 anodes can be arranged at the corners and 1 cathode at the center.

[0127] SIP monitoring array layout: Design the location of SIP monitoring holes. These holes are usually arranged between the grouting electrodes and the periphery to ensure that the entire target area can be "surrounded" to achieve accurate tomographic imaging.

[0128] Step 2: System layout and installation (field construction)

[0129] Drilling: Use standard drilling machines to drill holes at designated locations according to design drawings to form "electrode wells" for electrode installation and "monitoring holes" for SIP sensor installation.

[0130] (1) Place the pre-made anodes (e.g., iridium oxide coated titanium rods) and cathodes (e.g., stainless steel mesh) into the designated electrode wells, then lower the coaxial grouting pipeline into place with its outlet in the electrode well, and then backfill the electrode well with conductive medium (e.g., saturated bentonite) to ensure good electrical contact between the electrode and the surrounding soil.

[0131] (2) Installation of SIP monitoring equipment:

[0132] Lower the SIP-specific non-polarized electrodes (e.g., Ag / AgCl electrodes) through cables to the predetermined depth of each monitoring hole.

[0133] Surface equipment connection: On the ground, connect all underground electrodes (anodes, cathodes, SIP electrodes) through cables to the corresponding ground control equipment: grouting electrodes to programmable DC power supply; SIP electrodes to SIP measuring instruments.

[0134] Connect the grouting pipeline to the multi-channel grouting pump controlled by the controller.

[0135] Connect the power supply, grouting pump, and SIP instrument to the central computer containing the controller through data lines.

[0136] Step 3: System initialization and target setting (pre-operation debugging)

[0137] Background field measurement: Before injecting any reagent, the operator starts a "background scan" through the central computer containing the controller. The SIP monitoring equipment will conduct a comprehensive tomographic imaging of the original stratum to obtain the electrical property distribution map under the unreinforced state as a basis for subsequent changes.

[0138] Set project goal: The operator inputs the specific goal of this project on the human-machine interface of the central computer containing the controller. For example, if the goal is to increase the average intensity of the target area by 50%, the software will automatically convert it into an equivalent virtual conductivity σ'' target value that can be monitored by the SIP system. At the same time, input constraints such as cost and energy consumption.

[0139] Fourth step: Start intelligent closed-loop control (automatic operation)

[0140] One-key start: The operator clicks the "start" button to start the entire reinforcement process.

[0141] Controller takes over: From this moment on, it enters full-automatic closed-loop control mode. The control method in the controller calculates the optimal control instructions for the first step according to the current state (initially the background field) and the preset target, and automatically executes them:

[0142] Execution: The instruction grouting pump starts to inject calcium salt and urea into the anode well and urease into the cathode well according to the "bidirectional collision" strategy; at the same time, the power supply applies an initial voltage to the electrode.

[0143] Sensing: According to the preset "time-sharing work" mode, for example, after 20 minutes of work, the AI automatically suspends the electric field and grouting, and immediately triggers the SIP system to perform a quick full-field "snapshot" scan.

[0144] Analysis and decision-making: After receiving the new SIP image, it is compared with the image at the last moment to analyze the progress of the chemical reaction. The PINN model is self-corrected according to these real data, and then the MPC module predicts the future evolution and calculates the optimal control instructions for the next step (for example, "AI anode voltage increases 0.5V, C2 cathode enzyme injection rate is halved").

[0145] Loop iteration: The new instructions are automatically executed, and the "execution-sensing-analysis-decision-making" loop of the next round begins. This process will continue, and the operator only needs to monitor the three-dimensional visualization image (real-time display of ion front advance and expansion of calcium carbonate precipitation area) and parameter curve on the computer screen.

[0146] Fifth step: Process termination and final verification (completion)

[0147] Automatic termination: When the distribution and quantity of calcium carbonate precipitation underground (i.e. σ'' value) have reached or exceeded the preset project goal, grouting and power supply will be automatically stopped, and a "construction completed" prompt will be sent to the operator.

[0148] Final verification and report: After the construction is completed, a final comprehensive SIP scan is performed to generate a final reinforcement effect three-dimensional distribution map. This map can be used as a detailed quality assurance (QA) file and a completion acceptance report, directly proving the scope and uniformity of the reinforcement project.

[0149] Through the above standardized operation process, the embodiment of the present application converts the complex underground grouting process into a highly automated, process transparent, and result controllable modern engineering, greatly reducing the dependence on the experience of on-site operators and ensuring the engineering quality.

[0150] In summary, the control method of the integrated SIP monitoring and electric EICP grouting device according to the embodiment of the present application has the following beneficial effects:

[0151] (1) Break the forbidden zone and achieve effective reinforcement: fundamentally solve the physical transport bottleneck, making it possible to uniformly reinforce clay and other fine-grained soils that were previously considered "ungroutable";

[0152] (2) Precise control to ensure reinforcement quality: by controlling the electric field to control the pH front, the "on-demand" triggering and "point" precipitation of chemical reactions are realized, effectively avoiding wellhead blockage and ensuring the uniformity and high quality of the reinforcement body;

[0153] (3) Process visibility to ensure engineering reliability: real-time visibility of underground chemical processes completely changes the status quo of "blind construction", providing a direct basis for process control and quality assurance;

[0154] (4) Intelligent optimization to improve economic benefits: online optimization capability ensures that energy consumption and the use of expensive reagents (especially urease) are minimized under the premise of meeting engineering goals, significantly reducing engineering costs;

[0155] (5) Strong adaptability to complex working conditions: the entire closed-loop system can actively adapt to the heterogeneity and uncertainty of the underground environment, continuously correcting the control strategy to ensure the reliability and repeatability of the reinforcement effect under real complex working conditions.

[0156] Secondly, the control system of the integrated SIP monitoring and electric EICP grouting device according to the embodiment of the present application is described with reference to the accompanying drawings.

[0157] Figure 6 A block diagram of the control system of the integrated SIP monitoring and electric EICP grouting device provided by the embodiment of the present application.

[0158] As Figure 6As shown, the integrated SIP monitoring and control system 60 of the electrokinetic EICP grouting device includes a grouting module 601, a charge guiding module 602, an inhibition and triggering module 603, a monitoring module 604, and a generating and iterating module 605.

[0159] The grouting module 601 is configured to determine the polarity of the plurality of rod-shaped electrodes and inject urea solution, calcium chloride solution, and urease solution into the low-permeability soil. The charge guiding module 602 is configured to turn on the strong electric field of the plurality of rod-shaped electrodes to drive the electroosmosis and electromigration to achieve the directional transport of the EICP reactants in the low-permeability soil, and to electrolyze water at the anode and the cathode to form an acidic migration boundary and an alkaline migration boundary. The inhibition and triggering module 603 is configured to inhibit the urease activity in the grouting port area using the acidic migration boundary and trigger the urease activity in the predetermined target area using the alkaline migration boundary. The monitoring module 604 is configured to turn off the strong electric field of the plurality of rod-shaped electrodes according to a preset time-sharing working and measuring mechanism, and collect the current calcium carbonate precipitation distribution of different rod-shaped electrodes using a plurality of SIP monitoring devices. The generating and iterating module 605 is configured to generate an injection control sequence according to the current calcium carbonate precipitation distribution, and iteratively execute the injection, collection, and generation processes according to the injection control sequence until the target calcium carbonate precipitation distribution is formed, and stop the injection and power supply.

[0160] In some embodiments, the grouting module 601 includes:

[0161] A determining unit configured to determine whether each rod-shaped electrode of the plurality of rod-shaped electrodes is an anode or a cathode.

[0162] A first injection module configured to, in the case where any rod-shaped electrode is an anode, inject urea solution and calcium chloride solution into the grouting pipeline corresponding to the rod-shaped electrode.

[0163] A second injection module configured to, in the case where any rod-shaped electrode is a cathode, inject urease solution into the grouting pipeline corresponding to the rod-shaped electrode.

[0164] In some embodiments, the charge guiding module 602 includes:

[0165] The charge guiding module is configured to turn on the strong electric field of the plurality of rod-shaped electrodes, so that, under the action of the strong electric field, the Ca 2+ ions in the calcium chloride solution in the anode rod-shaped electrode move towards the cathode rod-shaped electrode through electromigration, and the urea molecules in the urea solution ride the electroosmotic flow, so that the urease molecules in the urease solution in the cathode rod-shaped electrode move towards the anode rod-shaped electrode through electrophoresis.

[0166] A generating module configured to cause the target area between the anode rod-shaped electrode and the cathode rod-shaped electrode to meet and undergo an EICP reaction to generate calcium carbonate precipitation.

[0167] In some embodiments, the preset time-sharing work and measurement mechanism is that after the plurality of rod electrodes are turned on to generate a strong electric field, the strong electric field is instantaneously paused in a preset quiet window, and the plurality of SIP monitoring devices are controlled to quickly complete a conductivity measurement in the current window.

[0168] In some embodiments, the generating and iteration module 605 includes:

[0169] a comparison unit configured to compare the current calcium carbonate precipitation distribution map with a calcium carbonate precipitation distribution map at a previous time to obtain a difference value;

[0170] a prediction and generation unit configured to predict a future evolution process of the current calcium carbonate precipitation distribution based on a model predictive control algorithm and a physical information neural network, and solve an optimization problem with constraints online based on the future evolution process of the current calcium carbonate precipitation distribution, so as to generate an injection control sequence, the optimization problem aiming to minimize reagent cost and minimize the difference between reinforcement effect and a target;

[0171] an iteration unit configured to iteratively execute the injection, acquisition and generation processes according to the injection control sequence until the current calcium carbonate precipitation distribution map reaches a target calcium carbonate precipitation distribution, stop injecting urea solution, calcium chloride solution and urease solution into the plurality of grouting pipes, and stop supplying power to the plurality of rod electrodes.

[0172] It should be noted that the foregoing explanation and description of the control method embodiment of the integrated SIP monitoring and electric EICP grouting device also applies to the control system of the integrated SIP monitoring and electric EICP grouting device of this embodiment, which will not be described here.

[0173] The control system of the integrated SIP monitoring and electric EICP grouting device according to the embodiments of the present application has the following beneficial effects:

[0174] (1) Break the forbidden zone and achieve effective reinforcement: fundamentally solve the physical transport bottleneck, making it possible to uniformly reinforce clay and other fine-grained soils that were previously considered "ungroutable";

[0175] (2) Precise control to ensure reinforcement quality: by controlling the electric field to control the pH front, the "on-demand" triggering and "point" precipitation of chemical reactions are realized, effectively avoiding wellhead blockage and ensuring the uniformity and high quality of the reinforcement;

[0176] (3) Process visibility ensures project reliability: real-time visibility of underground chemical processes completely changes the status quo of "blind construction", providing a direct basis for process control and quality assurance;

[0177] (4) Intelligent optimization, improve economic efficiency: online optimization capability, to ensure that the energy consumption and the use of expensive reagents (especially urease) are minimized under the premise of meeting the project goals, significantly reducing project costs;

[0178] (5) Strong adaptability, complex working conditions: the entire closed-loop system can actively adapt to the heterogeneity and uncertainty of the underground environment, continuously correct the control strategy, and ensure the reliability and repeatability of the reinforcement effect under real complex working conditions.

[0179] Figure 7 The structure schematic diagram of the electronic equipment provided by the embodiment of the application is provided. The electronic equipment can include:

[0180] The memory 701, the processor 702 and the computer program stored in the memory 701 and executable on the processor 702.

[0181] The processor 702 implements the control method of the integrated SIP monitoring and electric EICP grouting device provided in the above embodiment when executing the program.

[0182] Further, the electronic equipment further includes:

[0183] The communication interface 703 is used for communication between the memory 701 and the processor 702.

[0184] The memory 701 is used for storing the computer program executable on the processor 702.

[0185] The memory 701 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0186] If the memory 701, the processor 702 and the communication interface 703 are independently implemented, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and complete the communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or 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 the convenience of representation, Figure 7 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0187] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can complete the communication among each other through an internal interface.

[0188] The processor 702 can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0189] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or N embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0190] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0191] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing the specified logic functions (or steps) and / or can be implemented as hardware or as software stored on machine-readable media that is executable by a processing element or machine. The embodiments of the application are preferably implemented as a combination of hardware and software that is implemented on one or more computer systems or other processing systems.

[0192] The logic and / or steps represented in the flow diagrams, or otherwise described herein, for example, can be considered as a sequence of executable instructions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions, or a combination of the above.

Claims

1. An integrated SIP monitoring and electric EICP grouting device, characterized in that, include: Multiple rod-shaped electrodes are arranged vertically in multiple target injection wells in a plum blossom or rectangular array, and each rod-shaped electrode is coaxially sleeved with the grouting pipeline in the corresponding target injection well, for applying a DC driving electric field and injecting multi-frequency AC current into the target injection well. Multiple SIP monitoring devices, each connected to a rod-shaped electrode, are used to monitor the distribution of calcium carbonate precipitation in the underground medium under different frequencies of alternating current through the multiple rod-shaped electrodes; A urea solution storage tank, which is connected to the grouting pipeline in the target injection well, is used to store urea solution; A calcium chloride solution storage tank, which is connected to the grouting pipeline in the target injection well, is used to store calcium chloride solution; A urease solution storage tank, which is connected to the grouting pipeline in the target injection well, is used to store the urease solution; A grouting pump is connected to the urea solution storage tank, the calcium chloride solution storage tank, and the urease solution storage tank to inject the urea solution, the calcium chloride solution, and the urease solution into the low-permeability soil. A controller is connected to the grouting pump, the plurality of rod-shaped electrodes, the plurality of SIP monitoring devices, the urea solution storage tank, the calcium chloride solution storage tank, and the urease solution storage tank, respectively. The controller is used to control the grouting pump to inject urea solution, calcium chloride solution, and urease solution into the plurality of grouting pipelines, and to control the plurality of rod-shaped electrodes to release multi-frequency alternating current, so as to collect calcium carbonate precipitation distribution maps of different rod-shaped electrodes, generate an injection control sequence based on the calcium carbonate precipitation distribution maps of different rod-shaped electrodes, and iteratively execute the injection, acquisition, and generation processes according to the injection control sequence until the target calcium carbonate precipitation distribution is formed.

2. The apparatus according to claim 1, characterized in that, The coaxial connection between each rod electrode and the grouting pipeline is configured to allow an electric field to be applied to the urea solution, calcium chloride solution, and urease solution at the injection point while the urea solution, calcium chloride solution, and urease solution are being injected into the low-permeability soil.

3. The apparatus according to claim 1 or 2, characterized in that, The electrode configured as the anode among the plurality of rod-shaped electrodes has a titanium substrate coated with a noble metal oxide.

4. A control method for an integrated SIP monitoring and electric EICP grouting device, characterized in that, The integrated SIP monitoring and electric EICP grouting device according to any one of claims 1-3 includes the following steps: The polarity of multiple rod-shaped electrodes was determined, and urea solution, calcium chloride solution, and urease solution were injected into the low-permeability soil. The strong electric field of the multiple rod-shaped electrodes is turned on to drive electroosmosis and electromigration to realize the directional transport of EICP reactants in the low-permeability soil, and the strong electric field is used to electrolyze water at the anode and cathode to form acidic migration boundaries and alkaline migration boundaries. The acidic migration boundary is used to inhibit urease activity in the grouting port area, and the alkaline migration boundary is used to trigger urease activity in a predetermined target area. The strong electric field of the multiple rod-shaped electrodes is turned off according to the preset time-sharing operation and measurement mechanism, and the current calcium carbonate precipitation distribution map of different rod-shaped electrodes is collected using multiple SIP monitoring devices. An injection control sequence is generated based on the current calcium carbonate precipitation distribution map, and the injection, acquisition, and generation processes are iteratively executed according to the injection control sequence until the target calcium carbonate precipitation distribution is formed, at which point the injection and power supply are stopped.

5. The control method for the integrated SIP monitoring and electric EICP grouting device according to claim 4, characterized in that, The process of determining the polarity of multiple rod-shaped electrodes and injecting urea solution, calcium chloride solution, and urease solution into multiple grouting pipelines includes: Each of the plurality of rod-shaped electrodes is determined to be either an anode or a cathode; When any rod electrode is the anode, the urea solution and the calcium chloride solution are injected into the corresponding grouting pipeline. When any rod-shaped electrode is the cathode, the urease solution is injected into the corresponding grouting pipeline.

6. The control method for the integrated SIP monitoring and electric EICP grouting device according to claim 4, characterized in that, The process of activating the strong electric field of the plurality of rod-shaped electrodes to drive electroosmosis and electromigration to achieve the directional transport of EICP reactants in the low-permeability soil includes: A strong electric field is applied to the plurality of rod-shaped electrodes. Under the influence of this strong electric field, the Ca2+ concentration in the calcium chloride solution within the anode rod-shaped electrode is increased. 2+ Ions move toward the cathode rod electrode via electromigration, and urea molecules in the urea solution move toward the anode rod electrode via electroosmosis. The target region between the anode rod electrode and the cathode rod electrode meets and undergoes an EICP reaction to generate calcium carbonate precipitate.

7. The control method for the integrated SIP monitoring and electric EICP grouting device according to claim 4, characterized in that, The preset time-sharing operation and measurement mechanism is as follows: after the multiple rod electrodes turn on the strong electric field, the strong electric field is paused instantly in the preset silent window, and the multiple SIP monitoring devices are controlled to quickly complete a complex conductivity measurement within the current window.

8. The control method for the integrated SIP monitoring and electric EICP grouting device according to claim 4, characterized in that, The step of generating an injection control sequence based on the current calcium carbonate precipitation distribution map, and iteratively executing the injection, acquisition, and generation processes according to the injection control sequence until the target calcium carbonate precipitation distribution is formed, and then stopping the injection and power supply, includes: The current calcium carbonate precipitation distribution map is compared with the calcium carbonate precipitation distribution map at the previous moment to obtain the difference value; Based on the model predictive control algorithm and physical information neural network, the future evolution process of the current calcium carbonate precipitation distribution is predicted according to the difference value, and a constrained optimization problem with the goal of minimizing reagent cost and the difference between the reinforcement effect and the target is solved online according to the future evolution process of the current calcium carbonate precipitation distribution, so as to generate the injection control sequence. The injection, acquisition, and generation processes are iteratively executed according to the injection control sequence until the current calcium carbonate precipitation distribution map reaches the target calcium carbonate precipitation distribution. Then, the injection of the urea solution, the calcium chloride solution, and the urease solution into the multiple grouting pipelines is stopped, and the power supply to the multiple rod electrodes is stopped.

9. A control system integrating SIP monitoring and electric EICP grouting device, characterized in that, include: The grouting module is used to determine the polarity of multiple rod-shaped electrodes and inject urea solution, calcium chloride solution and urease solution into low-permeability soil. The charge guiding module is used to activate the strong electric field of the multiple rod-shaped electrodes to drive electroosmosis and electromigration to realize the directional transport of EICP reactants in the low-permeability soil, and to use the strong electric field to electrolyze water at the anode and cathode to form acidic migration boundaries and alkaline migration boundaries. The inhibition and triggering module is used to inhibit urease activity in the grouting port area using the acidic migration boundary and to trigger urease activity in a predetermined target area using the alkaline migration boundary. The monitoring module is used to shut down the strong electric field of the multiple rod-shaped electrodes according to a preset time-sharing operation and measurement mechanism, and to collect the current calcium carbonate precipitation distribution map of different rod-shaped electrodes using multiple SIP monitoring devices. The generation and iteration module is used to generate an injection control sequence based on the current calcium carbonate precipitation distribution map, and to iteratively execute the injection, acquisition and generation processes according to the injection control sequence until the target calcium carbonate precipitation distribution is formed, at which point the injection and power supply are stopped.

10. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the control method for the integrated SIP monitoring and electric EICP grouting device as described in any one of claims 4-8.

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