A method for simulating the dynamic construction process of a geotechnical bag

Abstract

The application provides a geotechnical bag dynamic construction process simulation method, and belongs to the technical field of hydraulic engineering. The method comprises the following steps: based on the topological structure of the geotechnical bag, a geotechnical bag construction process simulation model is constructed; a periodic slurry generation boundary is set to construct a calculation background network, a full-coupling simulation is performed to obtain a filling process simulation result, and the periodic slurry generation boundary is deleted; according to actual engineering conditions, the initial porosity and permeability coefficient of solid particles are obtained and updated to obtain a dynamic consolidation process simulation result; three-dimensional coordinate data of the bag particles are collected, surface reconstruction is used to obtain bag shape and tensile stress data, and the tensile strength margin is quantified to obtain geotechnical bag dynamic construction process simulation quantitative results. The application solves the problems that the existing geotechnical bag construction process simulation cannot determine the single filling height that the bag can withstand, the final shape and thickness distribution of the bag, and the problems of generated quality and engineering safety.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, and in particular relates to a method for simulating the dynamic construction process of geotextile bags. Background Technology

[0002] Geotextile bags are hollow, bag-shaped or tubular structural materials made of woven geotextile fabric. Materials such as mud, tailings slurry, and fly ash slurry are filled into the geotextile bags using hydraulic filling. Utilizing the permeable but material-impermeable nature of the geotextile bag, the filling material drains and solidifies, forming protective blocks such as dams. Geotextile bags have been widely used in projects such as ports, dikes, tailings dams, and ash storage sites, achieving significant results.

[0003] The core construction process of geotextile formwork includes filling and drainage consolidation, which is a complex and dynamic process. It involves both the interaction between the geotextile and the filling material inside the bag, and the fluid-solid interaction during the consolidation process of the filling material from a liquid to a solid state. The stress distribution of the geotextile formwork itself is an important aspect of the design, directly influenced by the development of these two interactions and dynamically changing throughout the construction process. Current geotextile formwork design and optimization heavily rely on engineers' experience and simplified calculations, failing to consider the core interaction process of "fluid filling—bag deformation—grout drainage consolidation," and unable to calculate the dynamic stress changes of the formwork during construction; only the stress distribution after final consolidation can be determined. This makes it difficult for current calculation methods to determine the single filling height that the formwork can withstand, the final shape of the formwork, and its thickness distribution, which can easily lead to problems during construction, such as tearing due to uneven stress, insufficient filling affecting the final forming quality and project safety.

[0004] Therefore, there is a need in this field for a method that can accurately simulate the entire construction process of geotextile bags, so as to achieve scientific prediction of the shape, stress distribution and optimal filling parameters of the geotextile bags, thereby providing a reliable theoretical basis and simulation method for the design and optimization of construction schemes. Summary of the Invention

[0005] To address the aforementioned shortcomings in existing technologies, this invention provides a dynamic construction process simulation method for geotextile formwork bags, which solves the problem that existing geotextile formwork bag construction process simulations struggle to determine the single filling height that the formwork bag can withstand, the final shape of the formwork bag, and the thickness distribution, thus causing issues with molding quality and engineering safety.

[0006] To achieve the above objectives, the technical solution adopted by this invention is: a method for simulating the dynamic construction process of geotextile bags, comprising the following steps: S1. Based on the topology of geotextile bags, and according to the planar laying shape of geotextile bags and the actual slurry mass concentration during construction, a simulation model of the geotextile bag construction process is constructed by building a three-dimensional model of the geotextile bag and a slurry filling model. S2. Based on the simulation model of the geotextile bag construction process, set the periodic slurry generation boundary, construct the calculation background network, and obtain the newly generated slurry solid-liquid material points based on fluid-solid coupling simulation and perform real-time control to obtain the simulation results of the filling process. S3. Based on the simulation results of the filling process, the boundary of periodic slurry generation is deleted, and the initial porosity and permeability coefficient of solid material points are obtained according to the actual engineering conditions. The results are updated according to the calculation background network and the preset empirical formula to obtain the simulation results of the dynamic consolidation process. S4. Based on the simulation results of the dynamic consolidation process, the three-dimensional coordinate data of the material points in the geotextile bag are collected, and the shape and tensile stress data of the geotextile bag are obtained by surface reconstruction. The tensile strength margin of the geotextile bag during the construction stage is quantified, and the simulation quantitative results of the dynamic construction process of the geotextile bag are obtained.

[0007] The beneficial effects of this invention are as follows: This invention constructs a simulation model of the geotextile bag construction process, obtains newly generated slurry solid-liquid material points, obtains the simulation results of the filling process, calculates the initial porosity and permeability coefficient of the solid material points, and obtains the simulation results of the dynamic consolidation process by combining preset empirical formulas. It also quantifies the tensile strength margin of the geotextile bag construction stage, and obtains the quantitative simulation results of the dynamic construction process of the geotextile bag. This clearly reflects the dynamic construction process of fluid filling, geotextile bag deformation, and slurry drainage and consolidation, accurately simulates the entire geotextile bag construction process, realizes the scientific prediction of geotextile bag morphology, stress distribution, and optimal filling parameters, and provides a reliable theoretical basis and simulation method for the design and optimization of construction schemes.

[0008] Further, S1 includes the following steps: S101. Based on the topology of geotextile bags, by generating material points and fabric yarn units of geotextile bags, and according to the planar laying form of geotextile bags in actual construction, a three-dimensional model of geotextile bags with a warp and weft structure is constructed. S102. Based on the actual construction, generate solid-liquid material points of the grout and mix them to construct a filling grout model. Then, integrate the three-dimensional model of the geotextile bag and the filling grout model to construct a simulation model of the geotextile bag construction process.

[0009] Furthermore, step S101 includes the following steps: S1011. Based on the topology of the geotextile bag, according to the geotextile bag material and initial shape, obtain the mass information and initial position information of the geotextile bag material points, and set the initial velocity and deformation gradient of the geotextile bag material points to zero. S1012. By integrating the mass information of the material points in the mold bag, the initial position information of the material points in the mold bag, the initial velocity of the material points in the mold bag, and the deformation gradient of the material points in the mold bag, the material points in the mold bag are generated. S1013. Connect two adjacent material points of the mold bag, obtain the mass information of the mold bag fabric yarn unit based on the mass information of the two connected material points of the mold bag, and obtain the initial position of the mold bag fabric yarn unit based on the middle position of the two connected material points of the mold bag. S1014. Set the initial velocity and deformation gradient of the molded bag fabric yarn unit to zero. By integrating the mass information, initial position, initial velocity, and deformation gradient of the molded bag fabric yarn unit, the molded bag fabric yarn unit is generated. S1015. Using geotextile material points and geotextile fabric yarn units, and based on the planar laying pattern of geotextile bags in actual construction, the yarn units are connected end to end to form a three-dimensional geotextile fabric warp and weft structure, thus constructing a three-dimensional model of a geotextile bag with a warp and weft structure that fits on both the top and bottom surfaces.

[0010] Furthermore, step S102 includes the following steps: S1021. Based on the actual slurry mass concentration, pipeline outlet size, and pipeline outlet location during construction, obtain the content, mass information, and initial location of the slurry solid-liquid substance points. The slurry solid-liquid material points include slurry solid material points and slurry liquid material points; S1022. Based on the actual filling speed and filling pressure during construction, obtain the initial velocity and deformation gradient of the slurry solid-liquid material points. S1023. By integrating the mass information of the solid-liquid material points in the slurry, the initial position of the solid-liquid material points in the slurry, the initial velocity of the solid-liquid material points in the slurry, and the deformation gradient of the solid-liquid material points in the slurry, the solid-liquid material points in the slurry are obtained. S1024. Based on the solid and liquid material points of the slurry, a solid-liquid mixture of the solid material points and liquid material points of the slurry is used to construct a filling slurry model for the geotextile bag. S1025. Integrate the three-dimensional model of the geotextile bag and the grouting material model to construct a simulation model of the geotextile bag construction process.

[0011] The beneficial effects of the above-mentioned further solutions are as follows: By dividing the geotextile bag construction process into a three-dimensional model of the geotextile bag and a grouting model, the present invention realizes the simulation of free collision and separation between geotextile bags and between bags and soil, and achieves refined simulation of large deformation of geotextile bag materials and interlayer interfaces.

[0012] Furthermore, S2 includes the following steps: S201. Based on the simulation model of the geotextile bag construction process, set the periodic slurry generation boundary facing the inside of the geotextile bag; S202. Construct a calculation background grid based on the area after the geotextile is filled; S203. The mass information, initial position, initial velocity, and deformation gradient of the geotextile material points, fabric yarn units, and slurry solid-liquid material points in the simulation model of geotextile construction process are mapped to the grid nodes with the relative distance from the material points to the grid nodes as the weight. S204. Based on the computational background grid, by performing momentum exchange between the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent, the mass information, initial position, initial velocity, and deformation gradient of the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent are updated to obtain the updated material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent. S205. Based on the updated material points of the mold bag, the fabric yarn units, and the solid-liquid material points of the slurry, combined with the periodic slurry generation boundary, the pressure of the slurry already filled in the mold bag is calculated. S206. In response to the fact that the pressure of the grout already filled in the mold bag has not reached the design value, new grout solid-liquid material points are generated at the boundary of periodic grout generation. Based on the pressure of the already filled grout, the initial velocity and deformation gradient of the new grout solid-liquid material points are adjusted in real time to obtain a simulation model of the initial filling process. S207. Based on cyclic simulation, the simulation model of the initial filling process is used as the simulation model of the geotextile bag construction process in the next cycle, and the process returns to step S203 to complete the fully coupled simulation of the filling process and obtain the simulation results of the geotextile bag filling process.

[0013] The beneficial effects of the above-mentioned further solutions are as follows: By setting a periodic grout generation boundary facing the inside of the geotextile bag and conducting momentum exchange between the material points of the geotextile bag, the fabric yarn units, and the solid and liquid material points of the grout, the present invention performs a full-coupled simulation of the geotextile bag, liquid, and solid during the filling process, and obtains a simulation model of the preliminary filling process. This allows for the pre-determination of the optimal grouting pressure parameters, effectively guiding on-site construction, accurately avoiding the risk of geotextile bag damage due to excessive pressure, and significantly improving the safety and reliability of grouting operations.

[0014] Furthermore, step S3 includes the following steps: S301. Based on the simulation results of the filling process, the simulation results of the filling process are used as the simulation model of the geotextile bag consolidation process, and the boundary of periodic slurry generation is deleted. S302. By setting the conditions that allow liquid slurry points to pass through and prohibit solid slurry points from passing through, the physical constraint conditions of the geotextile bag area are obtained. S303. Based on the actual engineering conditions at different locations of the geotextile bag, the permeability coefficient of the geotextile bag is obtained by setting the zones. S304. Based on the mass concentration and particle size distribution curve of the slurry in the geotextile bag under actual engineering conditions, the initial porosity and permeability coefficient of the solid material points in the geotextile bag are obtained. S305. Based on the physical constraints of the geotextile bag area, according to the calculation background network and the permeability coefficient of the geotextile bag partition, the velocity and seepage flow of liquid material points are calculated by solving the seepage control equation on the grid nodes, and a simulation model of the consolidation process of the geotextile bag discharged through seepage is obtained. S306. Based on the simulation model of the consolidation process of the geotextile bag discharged through seepage, the initial porosity of the solid material points is updated by obtaining the deformation gradient of the solid material points inside the geotextile bag, and the permeability coefficient of the updated solid material points is calculated by combining the preset porosity-permeability coefficient empirical formula. S307. Determine whether the permeability coefficient of the updated solid material point has reached the preset consolidation permeability value. If not, return to step S305 to perform the seepage discharge simulation again. If yes, use the current simulation model of the geotextile bag consolidation process after seepage discharge as the simulation result of the dynamic consolidation process of the geotextile bag.

[0015] Furthermore, S303 specifically refers to: S3031. Based on the actual engineering conditions at different locations of the geotextile bag, the geotextile bag is divided into zones to obtain the bottom of the geotextile bag and the remaining locations of the geotextile bag. S3032. Based on the minimum permeability coefficient of the underlying foundation and the geotextile bag, obtain the permeability coefficient at the bottom of the geotextile bag; S3033. Based on the vertical permeability coefficient of the geotextile bag material, obtain the permeability coefficient of the remaining locations of the geotextile bag; S3034. Integrate the permeability coefficient at the bottom of the geotextile bag and the permeability coefficient at other locations of the geotextile bag to obtain the permeability coefficient of the geotextile bag in different zones.

[0016] The beneficial effects of the above-mentioned further solutions are as follows: By obtaining and updating the initial porosity and permeability coefficient of solid material points inside the geotextile bag, and combining it with cyclic simulation, the present invention obtains the simulation results of the dynamic consolidation process of the geotextile bag, and comprehensively considers the influence of the drainage and consolidation effect of the slurry inside the bag on the geometry and stress distribution of the geotextile bag, thereby improving the accuracy of the prediction results.

[0017] Furthermore, step S4 includes the following steps: S401. Based on the simulation results of the dynamic consolidation process, use the preset cyclic calculation steps to collect the three-dimensional coordinate data of all material points in the dynamic consolidation process simulation results. S402. Based on the three-dimensional coordinate data, using surface reconstruction, the geotextile form is extracted by real-time output of the dynamic shape of the geotextile during the filling process simulation, the complete outline of the geotextile after the filling process simulation is completed, and the shape change of the geotextile during the continuous sinking of the geotextile during the dynamic consolidation process. S403. By extracting the three-dimensional coordinate data, tensile stress data is obtained. The tensile stress data is then mapped into a stress vector, and the tensile strength envelope is obtained. By calculating the ratio between the tensile strength envelope and the tensile stress data distribution, the tensile strength margin during the geotextile formwork construction stage is quantified. Combined with the formwork shape, the simulation quantification results of the dynamic construction process of the geotextile formwork are obtained.

[0018] Furthermore, S403 includes the following steps: S4031. By extracting the three-dimensional coordinate data, tensile stress data is obtained. By taking the coordinates of the material point of the mold bag as the starting point of the stress vector, and obtaining the stress vector length according to the tensile stress of the material point of the mold bag, the tensile stress data is mapped into a stress vector. S4032. Based on the ultimate tensile strength of the geotextile bag, a tensile strength envelope is generated on the outer periphery of the curved surface of the geotextile bag. S4033. By analyzing whether the stress vector penetrates the strength envelope, the result of the over-limit judgment is obtained; S4034. By calculating the ratio between the tensile strength envelope and the tensile stress data distribution, the tensile strength margin of the geotextile bag during the grout filling, filling completion, and consolidation settlement construction stages is quantified. Combined with the shape of the geotextile bag and the results of exceeding the limit judgment, the simulation quantitative results of the dynamic construction process of the geotextile bag are obtained.

[0019] The beneficial effects of the above-mentioned further solutions are as follows: By mapping tensile stress data into stress vectors, the present invention accurately simulates the actual spatiotemporal variation characteristics of the stress field of geotextile bags. On this basis, it realizes the scientific prediction of the optimal filling parameters of geotextile bags, providing reliable guidance for the construction of geotextile bag projects. Attached Figure Description

[0020] Figure 1 This is a flowchart of the method of the present invention.

[0021] Figure 2 This is the model before the geotextile bag is filled in this embodiment.

[0022] Figure 3 This is the model after the geotextile bag has been filled in this embodiment.

[0023] Figure 4 This is the result of the dynamic construction simulation of geotextile formwork in this embodiment. Detailed Implementation

[0024] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0025] Before describing this embodiment, the following terms will be explained: Kozeny-Carman equations.

[0026] Example like Figure 1 As shown, this invention provides a method for simulating the dynamic construction process of geotextile formwork bags, the implementation of which is as follows: S1. Based on the topology of geotextile bags, and according to the planar laying shape of geotextile bags and the actual slurry concentration during construction, a simulation model of the geotextile bag construction process is constructed by building a three-dimensional model of the geotextile bag and a slurry filling model. The specific steps are as follows: S101. Based on the topology of geotextile bags, by generating material points and fabric yarn units for the geotextile bags, and according to the planar laying pattern of the geotextile bags in actual construction, a three-dimensional model of the geotextile bag with a warp and weft structure that fits on both the upper and lower surfaces is constructed. The specific steps are as follows: S1011. Based on the topology of the geotextile bag, according to the geotextile bag material and initial shape, obtain the mass information and initial position information of the geotextile bag material points, and set the initial velocity and deformation gradient of the geotextile bag material points to zero. S1012. By integrating the mass information of the material points in the mold bag, the initial position information of the material points in the mold bag, the initial velocity of the material points in the mold bag, and the deformation gradient of the material points in the mold bag, the material points in the mold bag are generated. S1013. Connect two adjacent material points of the mold bag, obtain the mass information of the mold bag fabric yarn unit based on the mass information of the two connected material points of the mold bag, and obtain the initial position of the mold bag fabric yarn unit based on the middle position of the two connected material points of the mold bag. S1014. Set the initial velocity and deformation gradient of the molded bag fabric yarn unit to zero. By integrating the mass information, initial position, initial velocity, and deformation gradient of the molded bag fabric yarn unit, the molded bag fabric yarn unit is generated. S1015. Using geotextile material points and geotextile fabric yarn units, and based on the planar laying pattern of geotextile bags in actual construction, the yarn units are connected end to end to form a three-dimensional geotextile fabric warp and weft structure, thus constructing a three-dimensional model of a geotextile bag with a warp and weft structure that fits on both the top and bottom surfaces.

[0027] In this embodiment, to construct a simulation model of the geotextile formwork construction process, a three-dimensional model of the geotextile formwork is first constructed, specifically as follows: Based on the topology of the geotextile bag, a three-dimensional model of the geotextile bag is constructed using material points and fabric yarn units of the geotextile bag. The material point information of the geotextile bag includes mass, initial position, initial velocity, and deformation gradient. The mass and initial position are determined based on the simulated geotextile bag material and initial shape, while the initial velocity and deformation gradient are zero. The material points of two adjacent geotextile bags are connected to form a geotextile fabric yarn unit. All yarn units are connected end to end to form a three-dimensional geotextile warp and weft structure. The information of the geotextile fabric yarn unit includes mass, initial position, initial velocity and deformation gradient. The mass of all yarn units is determined by the mass of the material points that form the yarn. Its initial position is taken as the middle position of the adjacent material points, while the initial velocity and deformation gradient are set to zero. And based on the actual planar laying pattern of geotextile bags in construction, establish as follows: Figure 2 The three-dimensional simulation model of the geotextile bag before grouting is shown, resulting in a three-dimensional model of the geotextile bag with the top and bottom surfaces in place.

[0028] S102. Based on actual construction, generate solid-liquid material points of the grout and mix them to construct a grout filling model. Integrate the three-dimensional model of the geotextile bag and the grout filling model to construct a simulation model of the geotextile bag construction process. The specific steps are as follows: S1021. Based on the actual slurry mass concentration, pipeline outlet size, and pipeline outlet location during construction, obtain the content, mass information, and initial location of the slurry solid-liquid substance points. The slurry solid-liquid material points include slurry solid material points and slurry liquid material points; S1022. Based on the actual filling speed and filling pressure during construction, obtain the initial velocity and deformation gradient of the slurry solid-liquid material points. S1023. By integrating the mass information of the solid-liquid material points in the slurry, the initial position of the solid-liquid material points in the slurry, the initial velocity of the solid-liquid material points in the slurry, and the deformation gradient of the solid-liquid material points in the slurry, the solid-liquid material points in the slurry are obtained. S1024. Based on the solid and liquid material points of the slurry, a solid-liquid mixture of the solid material points and liquid material points of the slurry is used to construct a filling slurry model for the geotextile bag. S1025. Integrate the three-dimensional model of the geotextile bag and the grouting material model to construct a simulation model of the geotextile bag construction process.

[0029] In this embodiment, the next step is to construct a model of a solid-liquid mixture filling grout inside the bag, specifically as follows: Solid and liquid material points of the filling grout are generated to obtain solid-liquid material points. The information of the solid and liquid material points includes the mass, initial position, initial velocity and deformation gradient of the solid and liquid materials, respectively. The content, mass, and initial location of solid and liquid particles in the slurry are determined based on the actual slurry concentration, outlet size and location of the conveying pipeline. Based on the actual filling speed and pressure during construction, the initial velocity and deformation gradient of the solid and liquid material points are determined, and the solid and liquid material points of the filling grout are mixed to construct a solid-liquid mixed filling grout model inside the bag. By integrating the 3D model of the geotextile bag and the grouting model, a simulation model of the geotextile bag construction process is constructed.

[0030] S2. Based on the simulation model of the geotextile bag construction process, a periodic slurry generation boundary is set, and a computational background network is constructed. Based on fluid-solid coupling simulation, the newly generated solid-liquid material points of the slurry are obtained and real-time controlled to obtain the simulation results of the filling process. The specific steps are as follows: S201. Based on the simulation model of the geotextile bag construction process, set the periodic slurry generation boundary facing the inside of the geotextile bag; S202. Construct a calculation background grid based on the area after the geotextile is filled; S203. The mass information, initial position, initial velocity, and deformation gradient of the geotextile material points, fabric yarn units, and slurry solid-liquid material points in the simulation model of geotextile construction process are mapped to the grid nodes with the relative distance from the material points to the grid nodes as the weight. S204. Based on the computational background grid, by performing momentum exchange between the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent, the mass information, initial position, initial velocity, and deformation gradient of the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent are updated to obtain the updated material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent. S205. Based on the updated material points of the mold bag, the fabric yarn units, and the solid-liquid material points of the slurry, combined with the periodic slurry generation boundary, the pressure of the slurry already filled in the mold bag is calculated. S206. In response to the fact that the pressure of the grout already filled in the mold bag has not reached the design value, new grout solid-liquid material points are generated at the boundary of periodic grout generation. Based on the pressure of the already filled grout, the initial velocity and deformation gradient of the new grout solid-liquid material points are adjusted in real time to obtain a simulation model of the initial filling process. S207. Based on cyclic simulation, the simulation model of the initial filling process is used as the simulation model of the geotextile bag construction process in the next cycle, and the process returns to step S203 to complete the fully coupled simulation of the filling process and obtain the simulation results of the geotextile bag filling process.

[0031] In this embodiment, based on the actual number and location of the filling sleeves, and according to the simulation model of the geotextile bag construction process, periodic slurry generation boundaries facing the inside of the geotextile bag are set at the corresponding locations. Constructing a computational background mesh: The mass, velocity, and deformation gradient information corresponding to the geotextile material points, fabric yarn units, and slurry solid-liquid material points in the simulation model of geotextile construction process are all mapped to the mesh nodes; Based on the computational background grid, momentum exchange is performed between the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent. The velocity, position, and deformation gradient of the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent are updated to obtain the updated material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent. The fluid pressure at the boundary of periodic slurry generation is calculated synchronously, realizing the full coupling simulation between geotextile bag, liquid and solid during the filling process. In response to the pressure of the slurry already filled in the geotextile bag not reaching the design value, the newly generated solid-liquid material points of slurry are obtained at the boundary of periodic slurry generation. Based on the calculated pressure of the periodically generated slurry, the initial velocity and deformation gradient of the solid-liquid particles of the newly generated slurry are adjusted in real time to simulate the process of slurry continuously filling the mold bag, as well as the influence of the pressure change inside the mold bag after the actual construction process on the filling flow rate, forming a closed-loop feedback to obtain a simulation model of the initial filling process. Based on cyclic simulation, the simulation model after the initial filling process is used as the simulation model for the geotextile formwork construction process in the next cycle. The steps of obtaining the simulation model after the initial filling process are repeated until the fully coupled simulation of the entire filling process is completed, resulting in... Figure 3 The simulation results of the geotextile bag filling process are shown below. Figure 3 The black part represents the membrane bag, the blue part represents the liquid seepage, and the brown part represents the consolidated soil.

[0032] S3. Based on the simulation results of the filling process, the periodic slurry generation boundary is deleted, and the initial porosity and permeability coefficient of the solid material points are obtained according to the actual engineering conditions. Then, the results are updated according to the calculation background network and the preset empirical formula to obtain the simulation results of the dynamic consolidation process. The specific steps are as follows: S301. Based on the simulation results of the filling process, the simulation results of the filling process are used as the simulation model of the geotextile bag consolidation process, and the boundary of periodic slurry generation is deleted. S302. By setting the conditions that allow liquid slurry points to pass through and prohibit solid slurry points from passing through, the physical constraint conditions of the geotextile bag area are obtained. S303. Based on the actual engineering conditions at different locations of the geotextile bag, the permeability coefficient of the geotextile bag is obtained by setting the zones. S304. Based on the mass concentration and particle size distribution curve of the slurry inside the geotextile bag under actual engineering conditions, the initial porosity and permeability coefficient of the solid material points inside the geotextile bag are obtained.

[0033] In this embodiment, the model state at the end of the filling process simulation is used as the initial field for the geotextile formwork consolidation process simulation, that is, the filling process simulation result is used as the geotextile formwork consolidation process simulation model, and the periodic slurry generation boundary is deleted. Physical constraints are set for the geotextile bag area, allowing liquid material points to pass through but prohibiting solid material points from passing through, thus simulating the "water-permeable but sand-impermeable" characteristics of the geotextile bag. Based on the actual engineering conditions at different locations of the geotextile bag, the permeability coefficient of the geotextile bag is set in different zones. The permeability coefficient at the bottom of the geotextile bag is determined based on the minimum value of the permeability coefficient of the underlying foundation and the geotextile bag itself, while the permeability coefficient at other locations of the geotextile bag is determined based on the vertical permeability coefficient of the geotextile bag material itself. Based on the mass concentration and particle size distribution curve of the slurry inside the geotextile bag under actual engineering conditions, the initial porosity and permeability coefficient of the solid material points inside the geotextile bag are determined.

[0034] S305. Based on the physical constraints of the geotextile bag area, according to the calculation background network and the permeability coefficient of the geotextile bag partition, the velocity and seepage flow of liquid material points are calculated by solving the seepage control equation on the grid nodes, and a simulation model of the consolidation process of the geotextile bag discharged through seepage is obtained. S306. Based on the simulation model of the consolidation process of the geotextile bag discharged through seepage, the initial porosity of the solid material points is updated by obtaining the deformation gradient of the solid material points inside the geotextile bag, and the permeability coefficient of the updated solid material points is calculated by combining the preset porosity-permeability coefficient empirical formula. S307. Determine whether the permeability coefficient of the updated solid material point has reached the preset consolidation permeability value. If not, return to step S305 to perform the seepage discharge simulation again. If yes, use the current simulation model of the geotextile bag consolidation process after seepage discharge as the simulation result of the dynamic consolidation process of the geotextile bag.

[0035] In this embodiment, based on the computational background network and the physical constraints of the geotextile bag area, and according to the distribution of permeability coefficients in the geotextile bag zoning permeability coefficients, the fluid momentum equation is solved on the grid nodes to calculate the velocity and seepage flow of liquid material points, and to simulate the dynamic discharge process of slurry consolidation and liquid seepage out of the geotextile bag, thus obtaining a simulation model of the geotextile bag consolidation process after seepage discharge. The expression for the fluid momentum equation is as follows: ; in, Indicates porosity. Indicates fluid density, Represents the fluid acceleration vector. Represents the Hamiltonian operator. Represents the fluid stress tensor. Represents the interaction force between a fluid and a solid. Represents volume force; After the seepage water is drained, the deformation gradient of the solid material points inside the geotextile bag is obtained, and the porosity of the solid material points inside the geotextile bag is updated. n And combined with the simplified Kozeny-Carman porosity-permeability empirical formula, based on the particle radius of solid material points. r and updated porosity Update the point permeability coefficient of solid substances inside the mold bag. K The expression is as follows: ; in, This represents the permeability coefficient of the updated solid material point. Indicates the updated porosity. rRepresents the radius of a point particle in a solid substance; The simulation model of the consolidation process of the geotextile bag after seepage is obtained and executed repeatedly. The permeability coefficient of the updated solid material points is calculated, and it is determined whether the permeability coefficient of the updated solid material points reaches the preset consolidation permeability value. If so, the current simulation model of the consolidation process of the geotextile bag after seepage is used as the simulation result of the dynamic consolidation process of the geotextile bag.

[0036] S4. Based on the simulation results of the dynamic consolidation process, the three-dimensional coordinate data of the material points in the geotextile bag are collected, and the shape and tensile stress data of the geotextile bag are obtained through surface reconstruction. The tensile strength margin of the geotextile bag during the construction stage is quantified to obtain the simulation quantitative results of the dynamic construction process of the geotextile bag. The specific steps are as follows: S401. Based on the simulation results of the dynamic consolidation process, use the preset cyclic calculation steps to collect the three-dimensional coordinate data of all material points in the dynamic consolidation process simulation results. S402. Based on the three-dimensional coordinate data, using surface reconstruction, the geotextile form is extracted by real-time output of the dynamic shape of the geotextile during the filling process simulation, the complete outline of the geotextile after the filling process simulation is completed, and the shape change of the geotextile during the continuous sinking of the geotextile during the dynamic consolidation process.

[0037] In this embodiment, based on the simulation results of the dynamic consolidation process, the three-dimensional coordinate data of all material points in the mold bag are collected every 2000 cycle calculation steps. Through surface reconstruction, the dynamic shape of the formwork bag gradually becoming full and bulging during the grout filling stage, the final complete outline after filling, and the shape change of the formwork bag as it continues to sink during the consolidation and settlement process are output in real time. This enables the precise extraction and output of the formwork bag's shape evolution throughout the entire construction process, thus obtaining the formwork bag's shape.

[0038] S403. By extracting the three-dimensional coordinate data, tensile stress data is obtained. This tensile stress data is then mapped to a stress vector, and the tensile strength envelope is obtained. The ratio between the tensile strength envelope and the tensile stress data distribution is calculated to quantify the tensile strength margin during the geotextile formwork construction stage. Combined with the formwork shape, the simulation and quantification results of the dynamic construction process of the geotextile formwork are obtained. The specific steps are as follows: S4031. By extracting the three-dimensional coordinate data, tensile stress data is obtained. By taking the coordinates of the material point of the mold bag as the starting point of the stress vector, and obtaining the stress vector length according to the tensile stress of the material point of the mold bag, the tensile stress data is mapped into a stress vector. S4032. Based on the ultimate tensile strength of the geotextile bag, a tensile strength envelope is generated on the outer periphery of the curved surface of the geotextile bag. S4033. By analyzing whether the stress vector penetrates the strength envelope, the result of the over-limit judgment is obtained; S4034. By calculating the ratio between the tensile strength envelope and the tensile stress data distribution, the tensile strength margin of the geotextile bag during the grout filling, filling completion, and consolidation settlement construction stages is quantified. Combined with the shape of the geotextile bag and the results of exceeding the limit judgment, the simulation quantitative results of the dynamic construction process of the geotextile bag are obtained.

[0039] In this embodiment, the tensile stress of the geotextile bag is extracted as follows: based on the three-dimensional coordinate data of all the material points of the geotextile bag, the tensile stress data of each point is extracted synchronously and mapped to a stress vector perpendicular to the surface of the geotextile bag. The starting point of the stress vector is the coordinate of the material point of the geotextile bag, and the length of the stress vector is determined according to the tensile stress of the material point of the geotextile bag. Based on the ultimate tensile strength of the geotextile bag, a strength envelope surface is generated around the curved surface of the geotextile bag. By analyzing whether the stress vector penetrates this envelope surface, it is possible to quickly determine whether the tensile stress of the geotextile bag exceeds the limit. like Figure 4 As shown, further, by calculating the ratio between the tensile strength envelope and the actual tensile stress distribution, the tensile strength margin of the geotextile bag at each construction stage, such as grout filling, filling completion, and consolidation settlement, is quantified. This yields a complete set of quantitative results reflecting the dynamic construction process of "fluid filling - geotextile bag deformation - grout drainage and consolidation," thus completing the simulation of the dynamic construction process of the geotextile bag. Figure 4 The black part represents the membrane bag, the blue part represents the liquid seepage, and the brown part represents the consolidated soil.

Claims

1. A method for simulating the dynamic construction process of geotextile formwork bags, characterized in that, Includes the following steps: S1. Based on the topology of geotextile bags, and according to the planar laying shape of geotextile bags and the actual slurry mass concentration during construction, a simulation model of the geotextile bag construction process is constructed by building a three-dimensional model of the geotextile bag and a slurry filling model. S2. Based on the simulation model of the geotextile bag construction process, set the periodic slurry generation boundary, construct the calculation background network, and obtain the newly generated slurry solid-liquid material points based on fluid-solid coupling simulation and perform real-time control to obtain the simulation results of the filling process. S3. Based on the simulation results of the filling process, the boundary of periodic slurry generation is deleted, and the initial porosity and permeability coefficient of solid material points are obtained according to the actual engineering conditions. The results are updated according to the calculation background network and the preset empirical formula to obtain the simulation results of the dynamic consolidation process. S4. Based on the simulation results of the dynamic consolidation process, the three-dimensional coordinate data of the material points in the geotextile bag are collected, and the shape and tensile stress data of the geotextile bag are obtained by surface reconstruction. The tensile strength margin of the geotextile bag during the construction stage is quantified, and the simulation quantitative results of the dynamic construction process of the geotextile bag are obtained.

2. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 1, characterized in that, S1 includes the following steps: S101. Based on the topology of geotextile bags, by generating material points and fabric yarn units of geotextile bags, and according to the planar laying form of geotextile bags in actual construction, a three-dimensional model of geotextile bags with a warp and weft structure is constructed. S102. Based on the actual construction, generate solid-liquid material points of the grout and mix them to construct a filling grout model. Then, integrate the three-dimensional model of the geotextile bag and the filling grout model to construct a simulation model of the geotextile bag construction process.

3. The method for simulating the dynamic construction process of geotextile bags according to claim 2, characterized in that, S101 includes the following steps: S1011. Based on the topology of the geotextile bag, according to the geotextile bag material and initial shape, obtain the mass information and initial position information of the geotextile bag material points, and set the initial velocity and deformation gradient of the geotextile bag material points to zero. S1012. By integrating the mass information of the material points in the mold bag, the initial position information of the material points in the mold bag, the initial velocity of the material points in the mold bag, and the deformation gradient of the material points in the mold bag, the material points in the mold bag are generated. S1013. Connect two adjacent material points of the mold bag, obtain the mass information of the mold bag fabric yarn unit based on the mass information of the two connected material points of the mold bag, and obtain the initial position of the mold bag fabric yarn unit based on the middle position of the two connected material points of the mold bag. S1014. Set the initial velocity and deformation gradient of the molded bag fabric yarn unit to zero. By integrating the mass information, initial position, initial velocity, and deformation gradient of the molded bag fabric yarn unit, the molded bag fabric yarn unit is generated. S1015. Using geotextile material points and geotextile fabric yarn units, and based on the planar laying pattern of geotextile bags in actual construction, the yarn units are connected end to end to form a three-dimensional geotextile fabric warp and weft structure, thus constructing a three-dimensional model of a geotextile bag with a warp and weft structure that fits on both the top and bottom surfaces.

4. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 2, characterized in that, S102 includes the following steps: S1021. Based on the actual slurry mass concentration, pipeline outlet size, and pipeline outlet location during construction, obtain the content, mass information, and initial location of the slurry solid-liquid substance points. The slurry solid-liquid material points include slurry solid material points and slurry liquid material points; S1022. Based on the actual filling speed and filling pressure during construction, obtain the initial velocity and deformation gradient of the slurry solid-liquid material points. S1023. By integrating the mass information of the solid-liquid material points in the slurry, the initial position of the solid-liquid material points in the slurry, the initial velocity of the solid-liquid material points in the slurry, and the deformation gradient of the solid-liquid material points in the slurry, the solid-liquid material points in the slurry are obtained. S1024. Based on the solid and liquid material points of the slurry, a solid-liquid mixture of the solid material points and liquid material points of the slurry is used to construct a filling slurry model for the geotextile bag. S1025. Integrate the three-dimensional model of the geotextile bag and the grouting material model to construct a simulation model of the geotextile bag construction process.

5. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 1, characterized in that, S2 includes the following steps: S201. Based on the simulation model of the geotextile bag construction process, set the periodic slurry generation boundary facing the inside of the geotextile bag; S202. Construct a calculation background grid based on the area after the geotextile is filled; S203. The mass information, initial position, initial velocity, and deformation gradient of the geotextile material points, fabric yarn units, and slurry solid-liquid material points in the simulation model of geotextile construction process are mapped to the grid nodes with the relative distance from the material points to the grid nodes as the weight. S204. Based on the computational background grid, by performing momentum exchange between the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent, the mass information, initial position, initial velocity, and deformation gradient of the material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent are updated to obtain the updated material points of the mold bag, the yarn units of the fabric, and the solid-liquid material points of the sizing agent. S205. Based on the updated material points of the mold bag, the fabric yarn units, and the solid-liquid material points of the slurry, combined with the periodic slurry generation boundary, the pressure of the slurry already filled in the mold bag is calculated. S206. In response to the fact that the pressure of the grout already filled in the mold bag has not reached the design value, new grout solid-liquid material points are generated at the boundary of periodic grout generation. Based on the pressure of the already filled grout, the initial velocity and deformation gradient of the new grout solid-liquid material points are adjusted in real time to obtain a simulation model of the initial filling process. S207. Based on cyclic simulation, the simulation model of the initial filling process is used as the simulation model of the geotextile bag construction process in the next cycle, and the process returns to step S203 to complete the fully coupled simulation of the filling process and obtain the simulation results of the geotextile bag filling process.

6. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 1, characterized in that, S3 includes the following steps: S301. Based on the simulation results of the filling process, the simulation results of the filling process are used as the simulation model of the geotextile bag consolidation process, and the boundary of periodic slurry generation is deleted. S302. By setting the conditions that allow liquid slurry points to pass through and prohibit solid slurry points from passing through, the physical constraint conditions of the geotextile bag area are obtained. S303. Based on the actual engineering conditions at different locations of the geotextile bag, the permeability coefficient of the geotextile bag is obtained by setting the zones. S304. Based on the mass concentration and particle size distribution curve of the slurry in the geotextile bag under actual engineering conditions, the initial porosity and permeability coefficient of the solid material points in the geotextile bag are obtained. S305. Based on the physical constraints of the geotextile bag area, according to the calculation background network and the permeability coefficient of the geotextile bag partition, the velocity and seepage flow of liquid material points are calculated by solving the seepage control equation on the grid nodes, and a simulation model of the consolidation process of the geotextile bag discharged through seepage is obtained. S306. Based on the simulation model of the consolidation process of the geotextile bag discharged through seepage, the initial porosity of the solid material points is updated by obtaining the deformation gradient of the solid material points inside the geotextile bag, and the permeability coefficient of the updated solid material points is calculated by combining the preset porosity-permeability coefficient empirical formula. S307. Determine whether the permeability coefficient of the updated solid material point has reached the preset consolidation permeability value. If not, return to step S305 to perform the seepage discharge simulation again. If yes, use the current simulation model of the geotextile bag consolidation process after seepage discharge as the simulation result of the dynamic consolidation process of the geotextile bag.

7. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 6, characterized in that, Specifically, S303 is: S3031. Based on the actual engineering conditions at different locations of the geotextile bag, the geotextile bag is divided into zones to obtain the bottom of the geotextile bag and the remaining locations of the geotextile bag. S3032. Based on the minimum permeability coefficient of the underlying foundation and the geotextile bag, obtain the permeability coefficient of the bottom of the geotextile bag; S3033. Based on the vertical permeability coefficient of the geotextile bag material, obtain the permeability coefficient of the remaining locations of the geotextile bag; S3034. Integrate the permeability coefficient at the bottom of the geotextile bag and the permeability coefficient at other locations of the geotextile bag to obtain the permeability coefficient of the geotextile bag in different zones.

8. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 1, characterized in that, S4 includes the following steps: S401. Based on the simulation results of the dynamic consolidation process, use the preset cyclic calculation steps to collect the three-dimensional coordinate data of all material points in the dynamic consolidation process simulation results. S402. Based on the three-dimensional coordinate data, using surface reconstruction, the geotextile form is extracted by real-time output of the dynamic shape of the geotextile during the filling process simulation, the complete outline of the geotextile after the filling process simulation is completed, and the shape change of the geotextile during the continuous sinking of the geotextile during the dynamic consolidation process. S403. By extracting the three-dimensional coordinate data, tensile stress data is obtained. The tensile stress data is then mapped into a stress vector, and the tensile strength envelope is obtained. By calculating the ratio between the tensile strength envelope and the tensile stress data distribution, the tensile strength margin during the geotextile formwork construction stage is quantified. Combined with the formwork shape, the simulation quantification results of the dynamic construction process of the geotextile formwork are obtained.

9. The method for simulating the dynamic construction process of geotextile formwork bags according to claim 8, characterized in that, S403 includes the following steps: S4031. By extracting the three-dimensional coordinate data, tensile stress data is obtained. By taking the coordinates of the material point of the mold bag as the starting point of the stress vector, and obtaining the stress vector length according to the tensile stress of the material point of the mold bag, the tensile stress data is mapped into a stress vector. S4032. Based on the ultimate tensile strength of the geotextile bag, a tensile strength envelope is generated around the curved surface of the geotextile bag. S4033. By analyzing whether the stress vector penetrates the strength envelope, the result of the over-limit judgment is obtained; S4034. By calculating the ratio between the tensile strength envelope and the tensile stress data distribution, the tensile strength margin of the geotextile bag during the grout filling, filling completion, and consolidation settlement construction stages is quantified. Combined with the shape of the geotextile bag and the results of exceeding the limit judgment, the simulation quantitative results of the dynamic construction process of the geotextile bag are obtained.

Images