Viscosity-driven hydrodynamic grouting slurry solidification phase change simulation method and system

Abstract

The present disclosure provides a viscosity-driven dynamic water grouting slurry solidification phase change simulation method and system, including: constructing a slurry rheological model based on the correlation between slurry shear stress and shear rate; constructing a slurry viscosity time-varying function in combination with the slurry rheological model, and establishing a mapping relationship between the slurry viscosity time-varying function and the slurry solidification degree; analyzing the mechanical properties of the slurry after the phase change, and constructing a mathematical characterization relationship of the mechanical parameters of the slurry after the phase change over time; in the dynamic water grouting simulation process, using a viscosity-driven phase change equivalent trigger model to determine the slurry state, describing the slurry solidification degree based on viscosity in the fluid state, and describing the slurry plugging effect based on the mathematical characterization relationship of the mechanical parameters over time in the solid state. The scheme can effectively characterize the solidification phase change process of the slurry in the whole process of dynamic water grouting, and realize an accurate description of the slurry diffusion and plugging characteristics during the grouting process.

Description

Technical Field

[0001] The present invention belongs to the technical field of grouting solidification phase change process simulation, and in particular, relates to a viscosity-driven dynamic water grouting slurry solidification phase change simulation method and system. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Underground projects often face geological disasters of varying degrees. Among them, sudden water inrush has become one of the main disasters that hinder engineering construction due to its characteristics of "strong concealment, strong complexity, strong suddenness, and strong destructiveness". Under the current technical background, grouting is one of the effective means to control sudden water inrush disasters. However, due to the complexity of underground projects and the concealment of the injected medium, the diffusion and blocking effects of the slurry during the grouting construction process cannot be accurately described. Due to the intuitiveness of the numerical calculation method, the visualization of the grouting process can be achieved, which is an effective means to study the diffusion and blocking process of dynamic water grouting slurry.

[0004] As a complex physical and chemical change process, the dynamic water grouting process is mixed with the solidification phase change process of the slurry, which involves multiple chemical reactions, making it difficult or even impossible to obtain the desired analytical results by relying solely on theoretical solutions. The inventors found that in order to describe the solidification phase change characteristics of the slurry, the existing methods mainly describe it through viscosity, characterizing the slurry as a viscous fluid whose viscosity increases with time, and characterizing its solidification phase change process through the time evolution characteristics of the viscosity. However, viscosity is always a parameter that describes the fluid properties of the slurry, and can only describe the flow properties of the slurry. It is impossible to characterize the solid properties of the slurry after the phase change, and it is difficult to describe the slurry plugging effect of dynamic water grouting. Summary of the invention

[0005] In order to solve the above problems, the present disclosure provides a viscosity-driven dynamic water grouting slurry solidification phase change simulation method and system, which can effectively characterize the solidification phase change process of the slurry during the whole process of dynamic water grouting, and achieve an accurate description of the slurry diffusion and plugging characteristics during the grouting process.

[0006] According to a first aspect of an embodiment of the present disclosure, a viscosity-driven hydrodynamic grouting slurry solidification phase change simulation method is provided, comprising:

[0007] Based on the correlation between slurry shear stress and shear rate, a slurry rheological model is constructed;

[0008] Combined with the slurry rheological model, the time-varying function of slurry viscosity is constructed, and the mapping relationship between the time-varying function of slurry viscosity and the degree of slurry solidification is established;

[0009] Analyze the mechanical properties of the slurry after phase change and construct a mathematical representation of the change of mechanical parameters of the slurry over time after phase change;

[0010] During the dynamic water grouting simulation, the slurry state is determined by using a viscosity-driven phase change equivalent trigger model. In the fluid state, the slurry solidification degree is described based on the viscosity. In the solid state, the slurry plugging effect is described based on the mathematical characterization relationship of the change of mechanical parameters over time.

[0011] As a further limitation, the viscosity-driven phase change equivalent trigger model is specifically:

[0012]

[0013] Among them, μ s Indicates the current viscosity of the slurry, μ max It represents the trigger viscosity in the phase change equivalent trigger model, that is, the defined maximum viscosity. When the actual viscosity of the slurry is less than this viscosity, it is in a flow state and is described by fluid mechanics related properties. When the actual viscosity of the slurry is equal to this viscosity, it is in a solid state and is described by solid mechanics related properties.

[0014] As a further limitation, the phase change state of the slurry is determined by using a viscosity-driven phase change equivalent trigger model, and the originally complex solidification phase change chemical reaction is simplified by defining viscosity as a control variable for the transformation of the slurry from fluid to solid.

[0015] As a further limitation, the correlation between the slurry shear stress and the shear rate is determined specifically as follows: for the type of slurry to be simulated, a slurry solidification characteristic analysis test is conducted in advance to obtain parameter data during the slurry solidification process, and the slurry rheological model is constructed through data fitting.

[0016] As a further limitation, the description of the solidification degree of the slurry based on viscosity involves fluid parameters including slurry flow rate and viscosity.

[0017] As a further limitation, the solid mechanical parameters include Poisson's ratio, elastic modulus and strength of the solid.

[0018] As an optional implementation, the dynamic water grouting simulation adopts a combination of fluid simulation software and solid simulation software.

[0019] According to a second aspect of an embodiment of the present disclosure, a viscosity-driven hydrodynamic grouting slurry solidification phase change simulation system is provided, comprising:

[0020] A slurry rheological model determination unit, which is used to construct a slurry rheological model based on the correlation between the slurry shear stress and the shear rate;

[0021] A viscosity-solidification degree relationship determination unit, which is used to construct a slurry viscosity time-varying function in combination with a slurry rheological model, and to establish a mapping relationship between the slurry viscosity time-varying function and the slurry solidification degree;

[0022] A solid mechanical parameter time-varying relationship determination unit is used to analyze the mechanical properties of the slurry after phase change and to construct a mathematical representation relationship of the mechanical parameters of the slurry after phase change over time;

[0023] The grouting simulation unit is used in the dynamic water grouting simulation process. It uses the viscosity-driven phase change equivalent trigger model to determine the slurry state. In the flow state, the slurry solidification degree is described based on the viscosity. In the solid state, the slurry plugging effect is described based on the mathematical characterization relationship of the change of mechanical parameters over time.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] (1) The scheme disclosed in the present invention provides a simulation of the solidification phase change process of grouting slurry driven by viscosity. Compared with the existing schemes, the present invention takes into account the solidification phase change process of the slurry during dynamic water grouting, gives full play to the intuitiveness of the numerical calculation method, and combines with CFD (Computational Fluid Dynamics) software to realize the visualization of the entire grouting process. It can more accurately describe the process of slurry diffusion from fluid to solid plugging during dynamic water grouting, which has a reference significance for studying the diffusion and plugging effect of dynamic water grouting slurry.

[0026] (2) The scheme disclosed in the present invention provides an equivalent trigger mechanism for slurry phase change, establishes an equivalent trigger model for phase change driven by slurry viscosity, and simplifies the chemical reaction process of slurry solidification during dynamic water grouting by controlling viscosity. It is a new simplified method and simulation means that can more accurately characterize the changing laws of the slurry's own properties, and has certain reference value for accurately describing the sealing effect of dynamic water grouting.

[0027] Advantages of additional aspects of the present disclosure will be given in part in the following description and in part will become apparent from the following description or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0029] Figure 1 It is a schematic diagram of a method for simulating a viscosity-driven dynamic water grouting slurry solidification phase change process described in the first embodiment of the present disclosure;

[0030] Figure 2This is a flow chart for characterizing the properties of the slurry fluid described in Example 1 of the present disclosure;

[0031] Figure 3 This is a flow chart for establishing a simplified model of slurry solidification phase transition described in Example 1 of the present disclosure;

[0032] Figure 4 This is a trigger flow chart of the viscosity-driven phase change equivalent trigger model described in Example 1 of the present disclosure. DETAILED DESCRIPTION

[0033] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] In the absence of conflict, the embodiments in the present disclosure and the features in the embodiments may be combined with each other.

[0037] Embodiment 1:

[0038] The purpose of this embodiment is to provide a viscosity-driven method for simulating the solidification phase change of dynamic water grouting slurry.

[0039] like Figure 1 As shown in the figure, a schematic diagram of the simulation method of the solidification phase change of dynamic water grouting slurry driven by viscosity is shown, in which the colored area represents the slurry diffusion morphology, and the numbers ("1" to "13") represent different viscosities. The larger the number (the darker the color), the longer the residence time of the injected slurry and the higher the viscosity of the slurry. It can be understood that the numbers only represent the relative size of the viscosity and do not represent the exact viscosity value. When the viscosity reaches μ max The phase change is triggered and the slurry changes from a fluid state to a solid state. The purpose of this figure is to help readers understand the simulation effect of the solidification phase change of the slurry during the dynamic water grouting process. Figure 2 and Figure 3 , a viscosity-driven hydrodynamic grouting slurry solidification phase change simulation method, comprising:

[0040] Step 1: Based on the correlation between slurry shear stress and shear rate, a slurry rheological model is constructed;

[0041] Among them, the step 1 specifically involves conducting a slurry solidification characteristic analysis test in advance for the type of slurry to be simulated, obtaining parameter data during the slurry solidification process, and constructing a slurry rheological model through data fitting.

[0042] Step 2: Combined with the slurry rheological model, a time-varying function of slurry viscosity is constructed, and the solidification degree of the slurry is characterized by introducing the time-varying function of slurry viscosity, and a mapping relationship between the time-varying function of slurry viscosity and the solidification degree of slurry is established;

[0043] Step 3: Conduct different mechanical property analysis experiments to study the time evolution of mechanical parameters after slurry phase transition, and construct a mathematical representation of the change of mechanical parameters over time after slurry phase transition;

[0044] Step 4: During the dynamic water grouting simulation, the slurry state is determined using a viscosity-driven phase change equivalent trigger model. In the fluid state, the slurry solidification degree is described based on the viscosity. In the solid state, the slurry plugging effect is described based on the mathematical characterization relationship of the change of mechanical parameters over time.

[0045] As an optional implementation, the dynamic water grouting simulation adopts a combination of fluid simulation software and solid simulation software, wherein the fluid simulation software includes but is not limited to OpenFoam; the solid simulation software includes but is not limited to Abaqus.

[0046] The viscosity-driven phase change equivalent trigger model is similar to the "temperature" effect in ice-water transformation. Viscosity is defined as the control variable for the transformation of slurry from fluid to solid. Specifically:

[0047] A viscosity-driven phase change equivalent trigger model is expressed by the following formula:

[0048]

[0049] Among them, μ s Indicates the current viscosity of the slurry, μ max represents the trigger viscosity in the phase change equivalent trigger model, that is, the maximum viscosity defined. When the actual viscosity of the slurry is less than this viscosity, it is in a flow state and is described by fluid mechanics related properties; when the actual viscosity of the slurry is equal to this viscosity, it is in a solid state and is described by solid mechanics related properties. max The value of is set according to actual needs: specifically, different trigger viscosities can be set according to different slurry materials, and the trigger viscosity of each material is obtained according to experimental tests; at the same time, the trigger viscosity can be adjusted according to calculation requirements.

[0050] When the slurry is in a flowing state, according to the properties of different slurries, the viscosity time-varying model is established in combination with the rheological model of the slurry. The slurry is discretized into infinitesimal microclusters through the Lagrangian idea, the slurry residence time is tracked, and the function of the slurry viscosity changing with time at different injection times is established:

[0051] μ=f(T) (2)

[0052] Among them, there is a functional relationship between the slurry viscosity μ and the residence time T. The viscosity time-varying function is further used to characterize the slurry solidification degree and determine the diffusion effect of the slurry during the dynamic water grouting process.

[0053] The function of the slurry viscosity changing with time is obtained by acquiring a large amount of experimental test data and based on data fitting.

[0054] When the slurry is solid, according to the mathematical representation of the change of mechanical parameters over time after the phase change of the slurry, the slurry is discretized into infinitesimal microclusters through Lagrangian thinking, and the change law of different mechanical parameters over time is further established through the residence time:

[0055] E=f1(T) (3)

[0056] ν=f2(T) (4)

[0057] Among them, the elastic modulus E and Poisson's ratio v of the solid slurry are both functionally related to the slurry residence time T, which further characterizes the strength characteristics of the slurry and analyzes the plugging characteristics of the slurry during dynamic water grouting.

[0058] As an optional implementation, the plugging effect of the slurry during dynamic water grouting is determined based on the obtained mechanical parameters (i.e., elastic modulus and Poisson's ratio). That is, the stiffness of the solid slurry can be judged by utilizing the parameters. The greater the stiffness, the less likely it is to be flushed open by dynamic water, and the better the plugging effect.

[0059] The determination of the functional relationship between the elastic modulus, Poisson's ratio and slurry residence time requires conducting experiments in advance to obtain mechanical parameter data under different grouting residence times, which are obtained by data fitting.

[0060] Specifically, Figure 4 As shown, in the scheme disclosed in the present invention, the diffusion process of the liquid slurry is characterized by the numerical characterization of rheological parameters (focusing on viscosity changes), while the plugging effect of the solid slurry is characterized by the spatiotemporal tracking of solidification properties (focusing on solid mechanics parameters such as elastic modulus and Poisson's ratio). The slurry is transformed from liquid to solid, and the solidification phase change process is characterized by interface reconstruction, while the conversion of rheological parameters (focusing on viscosity changes) to solidification properties (focusing on solid mechanics parameters such as elastic modulus and Poisson's ratio) is transitioned through an equivalent parameter calibration method, and finally a phase change triggering model based on time-varying viscosity is established.

[0061] As a further limitation, the description of the solidification degree of the slurry is based on viscosity, and the fluid parameters involved include the slurry flow rate and viscosity.

[0062] As a further limitation, the solid mechanical parameters include Poisson's ratio, elastic modulus and strength of the solid.

[0063] The scheme disclosed in the present invention provides a method for simulating the solidification phase change process of dynamic water grouting slurry driven by viscosity, which simplifies the originally complex solidification phase change chemical reaction process into a viscosity-driven flow-solid state transformation process, fully considers the coagulation and solidification properties of the slurry, and can achieve a better description of the diffusion (flow properties) and sealing (solid properties) behaviors of the slurry during the dynamic water grouting process.

[0064] Embodiment 2:

[0065] The purpose of this embodiment is to provide a viscosity-driven dynamic water grouting slurry solidification phase change simulation system.

[0066] A viscosity-driven hydrodynamic grouting slurry solidification phase change simulation system, comprising:

[0067] A slurry rheological model determination unit, which is used to construct a slurry rheological model based on the correlation between the slurry shear stress and the shear rate;

[0068] A viscosity-solidification degree relationship determination unit, which is used to construct a slurry viscosity time-varying function in combination with a slurry rheological model, and to establish a mapping relationship between the slurry viscosity time-varying function and the slurry solidification degree;

[0069] A solid mechanical parameter time-varying relationship determination unit is used to analyze the mechanical properties of the slurry after phase change and to construct a mathematical representation relationship of the mechanical parameters of the slurry after phase change over time;

[0070] The grouting simulation unit is used in the dynamic water grouting simulation process. It uses the viscosity-driven phase change equivalent trigger model to determine the slurry state. In the flow state, the slurry solidification degree is described based on the viscosity. In the solid state, the slurry plugging effect is described based on the mathematical characterization relationship of the change of mechanical parameters over time.

[0071] In further embodiments, there is also provided:

[0072] An electronic device includes a memory and a processor, and computer instructions stored in the memory and executed on the processor, wherein when the computer instructions are executed by the processor, the method described in Embodiment 1 is performed. For the sake of brevity, no further description is given here.

[0073] It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general-purpose processors, digital signal processors DSP, application-specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0074] The memory may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type.

[0075] A computer-readable storage medium is used to store computer instructions. When the computer instructions are executed by a processor, the method described in embodiment 1 is completed.

[0076] The method in the first embodiment can be directly embodied as a hardware processor, or a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0077] Those skilled in the art will appreciate that the units, i.e., algorithm steps, of the various examples described in conjunction with this embodiment can be implemented in electronic hardware or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0078] The viscosity-driven dynamic water grouting slurry solidification phase change simulation method and system provided in the above embodiment can be realized and has broad application prospects.

[0079] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A viscosity-driven hydrodynamic grouting slurry solidification phase change simulation method, characterized in that: include: Based on the correlation between slurry shear stress and shear rate, a slurry rheological model is constructed; Combined with the slurry rheological model, the time-varying function of slurry viscosity is constructed, and the mapping relationship between the time-varying function of slurry viscosity and the degree of slurry solidification is established; Analyze the mechanical properties of the slurry after phase change and construct a mathematical representation of the change of mechanical parameters of the slurry over time after phase change; During the dynamic water grouting simulation, the phase change state of the slurry is determined by using the phase change equivalent trigger model driven by viscosity. In the fluid state, the solidification degree of the slurry is described based on the viscosity, and in the solid state, the slurry plugging effect is described based on the mathematical characterization relationship of the change of mechanical parameters over time. The viscosity-driven phase change equivalent trigger model is specifically: in, represents the current viscosity of the slurry, represents the trigger viscosity in the phase change equivalent trigger model, that is, the defined maximum viscosity; When the slurry is in a flowing state, the time-varying function of the slurry viscosity is established according to the properties of different slurries and the slurry rheological model. Specifically, the slurry is discretized into infinitesimal microclusters through the Lagrangian idea, the slurry residence time is tracked, and the time-varying function of the slurry viscosity at different injection times is established: Among them, there is a functional relationship between the slurry viscosity μ and the residence time T. The slurry solidification degree is characterized by the slurry viscosity time-varying function, and the slurry diffusion effect during the dynamic water grouting process is determined; the slurry viscosity time-varying function is obtained by acquiring a large amount of experimental test data and based on data fitting. When the slurry is solid, according to the mathematical representation of the change of mechanical parameters over time after the slurry phase change, the slurry is discretized into infinitesimal microclusters through Lagrangian thinking, and the change law of different mechanical parameters over time is established through residence time: Among them, the elastic modulus E and Poisson's ratio v of the solid slurry are both functionally related to the slurry residence time T to characterize the strength characteristics of the slurry and analyze the plugging characteristics of the slurry during the dynamic water grouting process; The determination of the functional relationship between the elastic modulus, Poisson's ratio and slurry residence time requires that experiments be conducted in advance to obtain mechanical parameter data under different grouting residence times, which are obtained by data fitting.

2. The viscosity-driven dynamic water grouting slurry solidification phase change simulation method according to claim 1, characterized in that: The phase change state of the slurry is determined by utilizing a viscosity-driven phase change equivalent trigger model, and the originally complex solidification phase change chemical reaction is simplified by defining viscosity as a control variable for the transformation of the slurry from a fluid to a solid.

3. The viscosity-driven dynamic water grouting slurry solidification phase change simulation method according to claim 1, characterized in that: The viscosity-based description of the slurry solidification degree involves fluid parameters including slurry flow rate and viscosity.

4. The viscosity-driven dynamic water grouting slurry solidification phase change simulation method according to claim 1, characterized in that: The mechanical parameters include Poisson's ratio, elastic modulus and strength of the solid.

5. The viscosity-driven dynamic water grouting slurry solidification phase change simulation method according to claim 1, characterized in that: The dynamic water grouting simulation adopts a combination of fluid simulation software and solid simulation software.

6. Viscosity-driven hydrodynamic grouting slurry solidification phase change simulation system, characterized in that: include: A slurry rheological model determination unit, which is used to construct a slurry rheological model based on the correlation between the slurry shear stress and the shear rate; A viscosity-solidification degree relationship determination unit, which is used to construct a slurry viscosity time-varying function in combination with a slurry rheological model, and to establish a mapping relationship between the slurry viscosity time-varying function and the slurry solidification degree; A solid mechanical parameter time-varying relationship determination unit is used to analyze the mechanical properties of the slurry after phase change and to construct a mathematical representation relationship of the mechanical parameters of the slurry after phase change over time; The grouting simulation unit is used in the process of dynamic water grouting simulation. It uses the phase change equivalent trigger model driven by viscosity to determine the phase change state of the slurry. In the fluid state, the solidification degree of the slurry is described based on the viscosity. In the solid state, the slurry plugging effect is described based on the mathematical characterization relationship of the change of mechanical parameters over time; The viscosity-driven phase change equivalent trigger model is specifically: in, represents the current viscosity of the slurry, represents the trigger viscosity in the phase change equivalent trigger model, that is, the defined maximum viscosity; When the slurry is in a flowing state, the time-varying function of the slurry viscosity is established according to the properties of different slurries and the slurry rheological model; specifically, the slurry is discretized into infinitesimal microclusters through the Lagrangian idea, the slurry residence time is tracked, and the time-varying function of the slurry viscosity at different injection times is established: Among them, there is a functional relationship between the slurry viscosity μ and the residence time T. The slurry solidification degree is characterized by the slurry viscosity time-varying function, and the slurry diffusion effect during the dynamic water grouting process is determined; the slurry viscosity time-varying function is obtained by acquiring a large amount of experimental test data and based on data fitting. When the slurry is solid, according to the mathematical representation of the change of mechanical parameters over time after the slurry phase change, the slurry is discretized into infinitesimal microclusters through Lagrangian thinking, and the change law of different mechanical parameters over time is established through residence time: Among them, the elastic modulus E and Poisson's ratio v of the solid slurry are both functionally related to the slurry residence time T to characterize the strength characteristics of the slurry and analyze the plugging characteristics of the slurry during the dynamic water grouting process; The determination of the functional relationship between the elastic modulus, Poisson's ratio and slurry residence time requires that experiments be conducted in advance to obtain mechanical parameter data under different grouting residence times, which are obtained by data fitting.

7. The viscosity-driven dynamic water grouting slurry solidification phase change simulation system according to claim 6, characterized in that: The phase change state of the slurry is determined by utilizing a viscosity-driven phase change equivalent trigger model, and the originally complex solidification phase change chemical reaction is simplified by defining viscosity as a control variable for the transformation of the slurry from a fluid to a solid.

8. The viscosity-driven dynamic water grouting slurry solidification phase change simulation system according to claim 6, characterized in that: The viscosity-based description of the slurry solidification degree involves fluid parameters including slurry flow rate and viscosity.

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