CN112668222B - Method for simulating bin wall stress characteristics in coal charging process of underground coal bin - Google Patents
Method for simulating bin wall stress characteristics in coal charging process of underground coal bin Download PDFInfo
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Abstract
The invention belongs to the technical field of coal bunker analog simulation, and particularly relates to a method for simulating bin wall stress characteristics in a coal charging process of an underground coal bunker. The method comprises the following steps of S100-building a coal bunker model; s200, building a coal briquette model; s300-calibration of material parameters: the calibrated parameters comprise intrinsic parameters of the materials and basic contact parameters among coal blocks and between the coal blocks and the surrounding rock wall of the coal bunker; s400, determining the simulated external environment and time step parameters, performing simulation analysis, then conducting post-processing, finally deriving the stress distribution rule of the coal blocks acting on the coal bunker surrounding rock wall at different coal charging moments, and realizing the visualization of the stress distribution rule. The method can detect the dangerous area in advance and make corresponding design optimization improvement, greatly improves the efficiency and safety of coal bunker design, reduces the experimental investment, shortens the actual construction period, and can bring huge economic benefits to enterprises.
Description
Technical Field
The invention belongs to the technical field of coal bunker analog simulation, and particularly relates to a method for simulating bin wall stress characteristics in the coal charging process of an underground coal bunker.
Background
The coal blocks are transported to the ground from the recovery of the coal face, so that the working efficiency of a mining area is guaranteed, the transportation efficiency and the lifting efficiency are both considered, and other unexpected emergencies are prevented from affecting the mining efficiency of a mine, so that the reliability and the stability of a production system are guaranteed by the temporary storage and transportation functions of an underground coal bunker. And the coal blocks are conveyed to the coal bunker inlet through a belt conveyor, stacked and stored in the coal bunker, discharged from the coal feeding port at the bottom and conveyed to the ground through the belt conveyor or other lifting equipment. Along with the production requirements of high-yield and high-efficiency mining areas, the volume design requirements of underground coal bunkers are continuously increased, and the stress distribution of the coal bunkers surrounding rock walls in the coal charging process needs to be explored to ensure the stability of the surrounding rock walls in the coal charging process of the coal bunkers, so that a basis is provided for the design of the coal bunker structure and the support parameters.
Due to the complexity of the actual situation on site, an analog simulation method can be adopted, the whole coal charging process can be accurately simulated through the combined application of three-dimensional modeling, particle discrete element and finite element numerical simulation technologies according to site data, and the stress distribution rule of the coal blocks accumulated on the coal bunker surrounding rock wall at different moments in the coal charging process can be obtained. According to the stress distribution rule, the dangerous area is detected in advance and corresponding design optimization improvement is made, so that the efficiency and safety of coal bunker design are greatly improved, the experimental investment is reduced, the actual construction period is shortened, and huge economic benefits can be brought to enterprises.
Disclosure of Invention
The invention aims to solve the problems and provides a method for simulating bin wall stress characteristics in the coal charging process of an underground coal bin.
The invention adopts the following technical scheme: a method for simulating bin wall stress characteristics in the coal charging process of an underground coal bin comprises the following steps of S100-building of a coal bin model; s200-building a coal briquette model; s300-calibration of material parameters: the calibrated parameters comprise intrinsic parameters of the materials and basic contact parameters among coal blocks and between the coal blocks and the surrounding rock wall of the coal bunker; s400, determining the simulated external environment and time step parameters, performing simulation analysis, and finally deriving the stress distribution rule of the coal blocks acting on the surrounding rock wall of the coal bunker at different coal charging moments through post-processing, and realizing the visualization of the stress distribution rule.
In the step S100, firstly, according to a coal bunker design manual and a construction design, a mathematical relation between position and size parameters of a coal bunker and a belt conveyor is obtained, and therefore parametric modeling is carried out according to engineering practice so as to accurately simulate the characteristics of a coal bunker model; then, in three-dimensional drawing software SOLIDWORKS, three-dimensional solid models of the coal bunker surrounding rock wall, the belt conveyor and the funnel surface are drawn one by one, a STEP format file is stored and output, and then WORKBENCH software is led in to divide grid units; and finally, importing the model file into the EDEM program through the STL format file to analyze subsequent links.
In step S200, firstly, setting a three-dimensional model template of the coal briquette according to the shape of the coal briquette transported by the belt conveyor; setting the size distribution proportion of the coal briquette templates according to the size distribution proportion of the coal briquettes transported by the belt conveyor; and setting the generation speed of the coal blocks according to the speed of the belt conveyor for conveying the coal blocks. And finally, inputting designed parameters of the particle factory in an EDEM program, and accurately simulating the process of conveying the coal blocks by a belt conveyor in the actual coal charging process.
In step S300, calibrating material parameters in the EDEM program, wherein the basic characteristic parameters include material density, poisson' S ratio, and elastic modulus; basic contact parameters include, for example, crash recovery coefficients, static friction and sliding friction; contact model parameters. The method comprises the steps of measuring and calibrating collision recovery coefficients among coal briquettes and among the coal briquettes and the coal bunker surrounding rock wall through a free-fall experiment, measuring and calibrating friction coefficients among the coal briquettes through a collapse experiment and a stacking angle experiment, measuring and calibrating the friction coefficients among the coal briquettes and the coal bunker surrounding rock wall through a sliding plate experiment, and simulating and calibrating contact model parameters through parameter matching in a virtual experiment.
In the step S400, according to the transportation speed of the belt conveyor, selecting two thirds of the total volume of the coal blocks transported to the coal bunker as simulation duration, setting the time step length to be 20% fixed, selecting a time interval of every 0.01 second as output data, storing a file and carrying out simulation analysis to obtain the stress distribution characteristics of the coal blocks acting on the surrounding rock wall of the coal bunker at different coal charging moments in the coal charging process; and then exporting result files IN the AXDT format, and importing the result files exported by the EDEM program into WORKBENCH software through an ADD-IN plug-IN to realize the visualization of the stress distribution rule.
Compared with the prior art, the method adopts an analog simulation method, can accurately simulate the whole coal charging process by the combined application of three-dimensional modeling, particle discrete element and finite element numerical simulation technologies according to field data, and can obtain the stress distribution rule of the coal block accumulation acting on the coal bunker surrounding rock wall at different moments in the coal charging process. According to the stress distribution rule, the danger area can be detected in advance, corresponding design optimization improvement can be made, the efficiency and safety of coal bunker design are greatly improved, the experiment investment is reduced, the actual construction period is shortened, and huge economic benefits can be brought to enterprises.
Drawings
FIG. 1 is a flow chart of the operation of an example of the application of the present invention;
FIG. 2 is a schematic representation of a SOLIDWORKS three-dimensional solid model of an oversized diameter downhole coal bunker in accordance with an illustrative embodiment of the present invention;
FIG. 3 is a front view of a SOLIDWORKS three-dimensional solid model of an oversized-diameter downhole coal bunker in accordance with an example of the present invention;
FIG. 4 is a diagram I of the EDEM discrete element simulation process of the application example of the present invention;
FIG. 5 is a diagram II of the simulation process of the EDEM discrete element of the application example of the present invention;
FIG. 6 is a result file of deriving the distribution rules of the stress of the surrounding rock walls of the coal bunker in the post-processing of the application example of the present invention;
FIG. 7 is a characteristic diagram showing the stress distribution of the silo wall during the coal charging process of the underground coal silo, according to the result file of the stress distribution rule, and by introducing a plug-in into the finite element analysis software WORKBENCH;
FIG. 8 is an enlarged lower portion of FIG. 7;
illustration of the drawings: where 1 denotes the hopper face, 2 denotes the belt conveyor, 3 denotes the coal bunker, 4 denotes the particle plant, 5 denotes the coal briquette, 6 denotes the force distribution (where the arrow denotes the direction of the force and the length denotes the magnitude of the force).
Detailed Description
The embodiment 1 provides a simulation method for the stress characteristics of a bin wall in the coal charging process of an underground coal bin, which comprises the following steps.
S100, building a coal bunker model: firstly, obtaining a mathematical relation between position and size parameters of a coal bunker and a belt conveyor according to a coal bunker design manual and construction design, and carrying out parametric modeling according to engineering practice so as to accurately simulate the characteristics of a coal bunker model; then, in three-dimensional drawing software SOLIDWORKS, three-dimensional solid models of a coal bunker surrounding rock wall, a belt conveyor and a funnel surface are drawn one by one (as shown in figure 2, wherein 1 represents the funnel surface, 2 represents the belt conveyor, and 3 represents a coal bunker), and the three-dimensional solid models are stored and output, and then, a STEP format file is imported into WORKBENCH software to divide grid units; and finally, importing the model file into the EDEM program through the STL format file to analyze subsequent links.
Building a coal briquette model in S200-EDEM program: firstly, setting a three-dimensional model template of the coal briquette according to the shape of the coal briquette transported by the belt conveyor; setting the size distribution proportion of the coal briquette templates according to the size distribution proportion of the coal briquettes transported by the belt conveyor; and setting the coal block generation speed according to the coal block conveying speed of the belt conveyor. Finally, inputting designed parameters of the particle factory in an EDEM program, and accurately simulating the process of conveying the coal blocks by the belt conveyor in the actual coal charging process. (see FIG. 3, where 1 denotes a hopper face, 2 denotes a belt conveyor, 3 denotes a coal bunker, 4 denotes a pellet mill, and 5 denotes a briquette).
Calibration of material parameters in S300-EDEM program: the calibrated parameters comprise intrinsic parameters of the material, such as density, poisson's ratio and elastic modulus, which are characteristic parameters of the material itself and are found in documents and manuals; the method comprises the following steps of (1) including basic contact parameters among coal blocks, between the coal blocks and the surrounding rock wall of the coal bunker, such as collision recovery coefficient, static friction coefficient and sliding friction coefficient; the method comprises the following steps of measuring and calibrating the collision recovery coefficients among coal briquettes and between the coal briquettes and the surrounding rock wall of the coal bunker through a free-fall experiment, measuring and calibrating the friction coefficient among the coal briquettes through a collapse experiment and a stacking angle experiment, measuring and calibrating the friction coefficient between the coal briquettes and the surrounding rock wall of the coal bunker through a sliding plate experiment, and simulating and calibrating the parameters of the contact model through parameter matching in a virtual experiment.
Simulation calculation and post-processing in S400-EDEM programs: selecting two thirds of the total volume of the coal block transported to the coal bunker as a simulation time period according to the transportation speed of the belt conveyor, setting the time step length to be 20% of a fixed time, selecting a time interval of every 0.01 second as output data, storing files and carrying out simulation analysis to obtain the stress distribution characteristics of the coal block acting on the surrounding rock wall of the coal bunker at different coal charging moments in the coal charging process; and then exporting result files IN the AXDT format, and importing the result files exported by the EDEM program into WORKBENCH software through an ADD-IN plug-IN to realize the visualization of the stress distribution rule. (see FIG. 5, where 1 represents the hopper face, 2 represents the belt conveyor, 3 represents the coal bunker, and 6 represents the force distribution).
In the process of establishing the model, firstly, according to the mathematical relationship between the size and the position parameters of an actual coal bunker and a belt conveyor, establishing the model in SOLIDWORKS software one by one according to the actual engineering so as to accurately simulate the characteristics of the coal bunker model; and after the grids are divided by the WORKBENCH software, the grid files are imported into the EDEM program through a software data transmission interface for subsequent simulation analysis.
For the establishment of the coal briquette model, firstly, setting a three-dimensional model template of the coal briquette according to the shape of the coal briquette transported by the belt conveyor; setting the size distribution proportion of the coal briquette templates according to the size distribution proportion of the coal briquettes transported by the belt conveyor; and setting the coal block generation speed according to the coal block conveying speed of the belt conveyor. And finally, inputting data in a particle factory, and accurately simulating the process that the belt conveyor conveys the coal blocks to the coal bunker inlet in the coal charging process, and the coal blocks fall and are stacked.
In parameter calibration, firstly, basic characteristic parameter settings of a material, such as material density, poisson ratio and elastic modulus, are determined; then, determining contact parameters among different materials, wherein the contact parameters mainly comprise contact parameters among coal blocks and contact parameters among the coal blocks and contact parameters among surrounding rock walls of the coal bunker, such as collision recovery coefficients, static friction and sliding friction; the method also comprises contact model parameters between materials (wherein the collision recovery coefficients between the coal blocks and the surrounding rock walls of the coal bunker are measured and calibrated through a free fall experiment, the friction coefficients between the coal blocks are measured and calibrated through a collapse experiment and a stacking angle experiment, the friction coefficients between the coal blocks and the surrounding rock walls of the coal bunker are measured and calibrated through a sliding plate experiment, and the contact model parameters are simulated and calibrated through parameter matching of a virtual experiment).
In the simulation process, according to the transportation speed of a belt conveyor, the time for transporting the coal briquettes to two thirds of the total volume of the coal bunker is selected as a simulation time period, the time step is set to be 20% of fixed time, the time interval for taking every 0.01 second as output data is selected, files are stored and simulation analysis is carried out, and the stress distribution characteristics of the coal briquettes acting on the surrounding rock wall of the coal bunker at different coal charging moments in the coal charging process are obtained.
1) Building a coal bunker model: firstly, obtaining a mathematical relation between position and size parameters of a coal bunker and a belt conveyor according to a coal bunker design manual and construction design, and carrying out parametric modeling according to engineering practice so as to accurately simulate the characteristics of a coal bunker model; then, in three-dimensional drawing software SOLIDWORKS, three-dimensional solid models of the coal bunker surrounding rock wall, the belt conveyor and the funnel surface are drawn one by one according to the model parameter relationship (as shown in fig. 2, wherein 1 represents the funnel surface, 2 represents the belt conveyor, and 3 represents the coal bunker).
2) Data transfer for the bunker model: exporting and storing a model file in SOLIDWORKS software in a multi-STEP format, and then importing the model file into WORKBENCH software to divide grid units; and finally, importing the model into EDEM software for subsequent link analysis in an STL format file.
3) Building of coal briquette model in the EDEM program: setting a three-dimensional model template of the coal briquette according to the shape of the coal briquette transported by the belt conveyor; setting the size distribution proportion of the coal briquette templates according to the size distribution proportion of the coal briquettes transported by the belt conveyor; and setting the generation speed of the coal blocks according to the speed of the belt conveyor for conveying the coal blocks. Finally, inputting designed parameters of the particle factory in an EDEM program, and accurately simulating the process of conveying the coal blocks by the belt conveyor in the actual coal charging process. (see FIG. 3, where 1 represents a hopper face, 2 represents a belt conveyor, 3 represents a bunker, 4 represents a pellet mill, and 5 represents a briquette).
4) Calibration of material parameters in the EDEM program: the calibrated parameters comprise intrinsic parameters of the material, such as density, poisson's ratio and elastic modulus, which are characteristic parameters of the material itself and are found in literatures and manuals; the method also comprises basic contact parameters among the coal blocks and between the coal blocks and the surrounding rock wall of the coal bunker, such as collision recovery coefficient, static friction coefficient and sliding friction coefficient; contact model parameters between materials (wherein collision recovery coefficients between coal blocks and between the coal blocks and the surrounding rock wall of the coal bunker are measured and calibrated through a free fall experiment, friction coefficients between the coal blocks are measured and calibrated through a collapse experiment and a stacking angle experiment, friction coefficients between the coal blocks and the surrounding rock wall of the coal bunker are measured and calibrated through a sliding plate experiment, and the contact model parameters are simulated and calibrated through parameter matching through a virtual experiment).
5) Simulating, calculating and post-processing a stress distribution rule: according to the transportation speed of the belt conveyor, selecting a volume capacity of transporting the coal blocks to two thirds of the total volume of the coal bunker as a simulation time period, setting the time step length to be 20% of a fixed value, selecting a time interval of outputting data every 0.01 second, storing files and carrying out simulation analysis to obtain the stress distribution characteristics of the coal blocks acting on the surrounding rock wall of the coal bunker at different coal charging moments in the coal charging process; and then deriving a stress distribution rule of the coal blocks acting on the surrounding rock wall of the coal bunker at different coal charging moments through post-processing, wherein an AXDT result file (shown IN figure 4) is obtained, and a result file derived from an EDEM program is imported into WORKBENCH software through an ADD-IN plug-IN to realize visualization of the stress distribution rule (shown IN figure 5, wherein 1 represents a funnel surface, 2 represents a belt conveyor, 3 represents the coal bunker, and 6 represents the distribution of force).
Claims (1)
1. A method for simulating bin wall stress characteristics in the process of coal loading of an underground coal bin is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s100, building a coal bunker model;
firstly, obtaining a mathematical relation between position and size parameters of a coal bunker and a belt conveyor according to a coal bunker design manual and construction design, and carrying out parametric modeling according to engineering practice so as to accurately simulate the characteristics of a coal bunker model; then, in three-dimensional drawing software SOLIDWORKS, three-dimensional entity models of the coal bunker surrounding rock wall, the belt conveyor and the funnel surface are drawn one by one, and the STEP format file is stored and output, and then the STEP format file is imported into WORKBENCH software for dividing grid units; finally, importing the model file into the EDEM program through the STL format file to analyze subsequent links;
s200, building a coal briquette model;
firstly, setting a three-dimensional model template of the coal briquette according to the shape of the coal briquette transported by the belt conveyor; setting the size distribution proportion of the coal briquette templates according to the size distribution proportion of the coal briquettes transported by the belt conveyor; setting the coal block generation speed according to the coal block conveying speed of the belt conveyor, and finally inputting designed particle factory parameters in an EDEM program to accurately simulate the coal block conveying process of the belt conveyor in the actual coal charging process;
s300-calibration of material parameters: the calibrated parameters comprise intrinsic parameters of the materials and basic contact parameters among coal blocks and between the coal blocks and the surrounding rock wall of the coal bunker;
calibrating material parameters in an EDEM program, wherein basic characteristic parameters comprise material density, poisson ratio and elastic modulus; the basic contact parameters comprise collision recovery coefficients, static friction force and sliding friction force; measuring and calibrating collision recovery coefficients among the coal blocks and between the coal blocks and the surrounding rock wall of the coal bunker through a free-fall experiment, measuring and calibrating friction coefficients among the coal blocks through a collapse experiment and a stacking angle experiment, measuring and calibrating friction coefficients between the coal blocks and the surrounding rock wall of the coal bunker through a sliding plate experiment, and simulating and calibrating the parameters of the contact model through parameter matching through a virtual experiment;
s400, determining a simulated external environment and time step parameters, performing simulation analysis, and deriving stress distribution rules of coal blocks acting on the surrounding rock walls of the coal bunker at different coal charging moments through post-processing to realize visualization of the stress distribution rules;
selecting two thirds of the total volume of the coal bunker to be transported as a simulation time period according to the transportation speed of the belt conveyor, setting the time step length to be 20% fixed, selecting a time interval of every 0.01 second as output data, storing a file and carrying out simulation analysis to obtain the stress distribution characteristics of the coal bunkers acting on the surrounding rock wall of the coal bunker at different coal charging moments in the coal charging process; and then exporting result files IN the AXDT format, and importing the result files exported by the EDEM program into WORKBENCH software through an ADD-IN plug-IN to realize the visualization of the stress distribution rule.
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