CN113946930A - Simulation method for mechanical behavior and energy evolution of gas-containing coal rock composite structure - Google Patents
Simulation method for mechanical behavior and energy evolution of gas-containing coal rock composite structure Download PDFInfo
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- CN113946930A CN113946930A CN202010682033.4A CN202010682033A CN113946930A CN 113946930 A CN113946930 A CN 113946930A CN 202010682033 A CN202010682033 A CN 202010682033A CN 113946930 A CN113946930 A CN 113946930A
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Abstract
The invention discloses a simulation method of mechanical behavior and energy evolution of a gas-containing coal-rock composite structure, which utilizes numerical simulation to research the dynamic evolution of the mechanical behavior and energy of different coal-rock composite structures, obtains the energy proportion of rock elastic energy in the composite structure according to the maximum value of the respective elastic energy of coal rock in the composite structure, further defines the coal-rock energy transmission and the mutual influence mechanism thereof, and can take targeted top and bottom plate treatment measures according to different influence degrees of the top and bottom plate elastic energy on the basis to realize accurate prevention and control of mine dynamic disasters under the influence of the top and bottom plate elastic energy.
Description
Technical Field
The invention relates to the field of simulation analysis of coal-rock composite structures, in particular to a simulation method of mechanical behavior and energy evolution of a gas-containing coal-rock composite structure.
Background
China is the largest coal producing country and consuming country in the world, and coal plays an important role in the energy structure of China. Although corresponding series of prevention and control measures are adopted, mine dynamic disasters related to coal rock gas still occur sometimes, and the mechanism of coal rock gas catastrophe is not clear and perfect after the root is concluded. At present, researches aiming at mine dynamic disasters (coal and gas outburst and rock burst) are generally focused on the action of a coal body and gas, related researches are only carried out on the basis of coal bed stress and gas conditions to directly ignore the elastic energy of a top plate and a bottom plate, and only rough estimation is given on the other hand, actually, detailed quantitative researches aiming at the elastic energy of the top plate and the bottom plate are rarely carried out, particularly, under the deep mining condition, the deep mining is subjected to high ground stress, high temperature, high gas and other problems to increase the coal and gas outburst risk and enhance the coal rock impact property, the probability of the composite coal and rock dynamic disasters of some high gas mines, coal and gas outburst mines is obviously increased, the disasters not only show partial characteristics of coal and gas outburst, but also have partial characteristics of rock burst, and mutual influence of two dynamic disasters, And (4) compounding with each other. Meanwhile, the deep composite coal and rock dynamic disaster is a complex mechanical process under double actions of high stress (ground stress) and dynamic disturbance (mining pressure relief), and multiple factors are mutually interwoven in the disaster occurrence process, so that the factors possibly mutually induce, mutually reinforce or generate a resonance effect in the accident inoculation, generation and development processes, so that the occurrence mechanism of the composite dynamic disaster is more complex, and the specific participation of the elastic energy of the top plate and the bottom plate in the disaster process is more important to understand.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a simulation method of mechanical behavior and energy evolution of a gas-containing coal-rock composite structure, which analyzes the dynamic evolution of the mechanical behavior and energy of different coal-rock composite structures by utilizing numerical simulation, analyzes the energy transmission and the influence mechanism of coal-rock, and realizes accurate prevention and control of mine dynamic disasters under the influence of rock elastic energy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a simulation method for mechanical behavior and energy evolution of a gas-bearing coal-rock composite structure comprises the following steps:
step one, generating a coal rock model through a direct generation mode and an indirect generation mode;
step two, respectively carrying out model calculation preprocessing on the model generated in the step one, wherein the model calculation preprocessing comprises the steps of applying gas pressure, loading and setting damage judgment conditions;
respectively calculating models, and carrying out comparative analysis on the stress distribution, the displacement distribution, the plastic zone and the elastic energy distribution of the coal rock model generated in a direct generation mode and an indirect mode;
and step four, performing coal rock elastic energy conversion and proportion analysis.
In the first step, the method for directly generating the coal-rock model comprises the steps of assigning coal mechanical parameters to one part of the model and assigning rock mechanical parameters to the other part of the model.
In the first step, the method for generating the coal-rock model in an indirect mode comprises the steps of firstly generating the coal-body model and assigning the mechanical parameters of the coal body, and regenerating the rock-forming model and assigning the mechanical parameters of the rock; the coal body model and the rock model are connected through establishing a contact surface, and the coal rock contact is weak contact in different degrees through setting contact surface parameters.
In the second step, the first step is carried out,
the method of applying gas pressure is: the gas pressure is set according to the pressure gradient, and the gas pressure is decreased progressively from the bottom of the coal bed model to the top of the coal bed model;
the loading method comprises the following steps: loading step by step, setting the final loading stress, setting the loading mode to be displacement loading or stress loading, and setting the loading step according to specific research;
the method for setting the damage judgment condition comprises the following steps: and judging the damage of the coal-rock composite structure by utilizing the displacement mutation or plastic region damage area.
The third step is specifically as follows:
step 3.1: respectively outputting stress distribution, displacement distribution and plastic zone distribution of the coal-rock composite structure on the basis of the second step;
step 3.2: compiling respective elastic energy calculation formulas of coal bodies and rocks in the coal-rock composite structure by using a fish language, and obtaining elastic energy distribution and maximum values of the coal and the rocks through post-processing;
step 3.3: and (4) carrying out comparative analysis on respective stress distribution, displacement distribution, plastic zone and elastic energy distribution of the directly generated coal-rock model and the indirectly generated coal-rock model.
And 3.3, realizing stress distribution, displacement distribution, plastic zone and elastic energy distribution through slice setting of post-treatment, wherein the slices are axial slices along the center of the coal-rock composite structure.
The fourth step comprises the following specific steps:
step 4.1: calculating the energy ratio of the rock elastic energy in the combined structure according to the maximum value of the coal rock elastic energy obtained in the step 3.2, wherein the calculation method is to divide the maximum value of the rock elastic energy by the maximum value of the coal body elastic energy;
step 4.2: and (4) carrying out comparative analysis on the energy ratio of the elastic energy of the rock in the combined structure in the coal rock model generated by the two modes.
The invention has the following beneficial effects:
1) the invention provides a simulation method of gas-containing coal rock composite structure mechanical behavior and energy evolution thereof according to actual conditions on site, which is beneficial supplement for relevant experimental research of coal rock gas dynamic disasters;
2) the invention can realize the research under various working conditions through the specific setting and the related parameter change in the simulation, and has the characteristics of simplicity, convenience, rapidness and high efficiency;
3) the energy proportion of the rock elastic energy in the combined structure is further calculated by utilizing the coal rock elastic energy obtained by simulation in the invention, the specific contribution of the rock elastic energy can be represented, the influence of the rock elastic energy is fully considered, the method has important theoretical significance and engineering actual value, and has positive significance for the prediction and prevention of mine composite dynamic disasters such as rock burst-coal and gas outburst and the like induced by deep mining.
Drawings
FIG. 1 is a flow chart of a simulation method of mechanical behavior and energy evolution of a gas-bearing coal-rock composite structure.
Detailed Description
To fully illustrate the features and advantages of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1, a simulation method for mechanical behavior and energy evolution of a gas-bearing coal-rock composite structure includes the following steps:
the first step, modeling, is specifically divided into the following two modes:
the first method is as follows: directly generating a model, wherein one part of the model is assigned with coal mechanical parameters, and the other part of the model is assigned with rock mechanical parameters;
the second method comprises the following steps: firstly, generating a coal body model and assigning coal body mechanical parameters, and regenerating a rock formation model and assigning rock mechanical parameters; the coal rock models are connected by establishing contact surfaces, wherein the coal rock contact is weak contact in different degrees by setting contact surface parameters;
secondly, model operation preprocessing, specifically comprising the following three steps:
step 2.1: applying gas pressure to the model generated in the first step, wherein the gas pressure is set according to a pressure gradient, and the gas pressure decreases from the bottom of the coal bed model to the top of the coal bed model;
step 2.2: step loading is carried out on the model generated in the first step, the final loading stress is set, the loading mode is displacement loading or stress loading, and the loading step is set according to the research;
step 2.3: setting a damage judgment condition, and judging the damage of the coal rock composite structure by utilizing a displacement mutation or plastic region damage area;
step three, analyzing a simulation result, specifically comprising the following three steps:
step 3.1: sequentially outputting stress distribution, displacement distribution and plastic zone distribution of the coal-rock composite structure according to simulation results of the mode one and the mode two in the first step respectively;
step 3.2: compiling respective elastic energy calculation formulas of coal bodies and rocks in the coal-rock composite structure by using a fish language, and obtaining elastic energy distribution and maximum values of the coal and the rocks through post-processing;
step 3.3: comparing and analyzing the stress distribution, displacement distribution, plastic zone and elastic energy distribution of the coal rock in the first mode and the second mode combined structure;
fourthly, performing coal rock elasticity energetication and proportion analysis, specifically comprising the following two steps:
step 4.1: calculating the energy ratio of the rock elastic energy in the combined structure according to the maximum value of the coal rock elastic energy obtained in the step 3.2, wherein the calculation method is to divide the maximum value of the rock elastic energy by the maximum value of the coal body elastic energy;
step 4.2: and comparing the energy ratio of the elastic energy of the rock in the combined structure in the first analysis mode and the second analysis mode.
Stress distribution, displacement distribution, plastic zone and elastic energy distribution in the step 3.3 are all realized through the slice setting of aftertreatment, the slice is the axial section along the coal rock integrated configuration center.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A simulation method for mechanical behavior and energy evolution of a gas-bearing coal-rock composite structure is characterized by comprising the following steps:
step one, generating a coal rock model through a direct generation mode and an indirect generation mode;
step two, respectively carrying out model calculation preprocessing on the model generated in the step one, wherein the model calculation preprocessing comprises the steps of applying gas pressure, loading and setting damage judgment conditions;
respectively calculating models, and carrying out comparative analysis on the stress distribution, the displacement distribution, the plastic zone and the elastic energy distribution of the coal rock model generated in a direct generation mode and an indirect generation mode;
and step four, performing coal rock elastic energy conversion and proportion analysis.
2. The method for simulating the mechanical behavior and the energy evolution of the gas-bearing coal-rock composite structure as claimed in claim 1, wherein in the first step, the method for directly generating the coal-rock model comprises the steps of assigning coal body mechanical parameters to one part of the model and assigning rock mechanical parameters to the other part of the model.
3. The method for simulating the mechanical behavior and the energy evolution of the gas-bearing coal-rock composite structure as claimed in claim 1, wherein in the step one, the method for generating the coal-rock model in an indirect mode comprises the steps of generating the coal-body model and assigning the coal-body mechanical parameters, and regenerating the rock-forming model and assigning the rock-body mechanical parameters; the coal body model and the rock model are connected through establishing a contact surface, and the coal rock contact is weak contact in different degrees through setting contact surface parameters.
4. The method for simulating the mechanical behavior and the energy evolution of the gas-bearing coal-rock composite structure as claimed in claim 1, wherein in the second step,
the method of applying gas pressure is: the gas pressure is set according to the pressure gradient, and the gas pressure is decreased progressively from the bottom of the coal bed model to the top of the coal bed model;
the loading method comprises the following steps: loading step by step, setting the final loading stress, setting the loading mode to be displacement loading or stress loading, and setting the loading step according to specific research;
the method for setting the damage judgment condition comprises the following steps: and judging the damage of the coal-rock composite structure by utilizing the displacement mutation or plastic region damage area.
5. The method for simulating the mechanical behavior and the energy evolution of the gas-bearing coal rock composite structure according to claim 1, wherein the concrete method in the third step is as follows:
step 3.1: respectively outputting stress distribution, displacement distribution and plastic zone distribution of the coal-rock composite structure on the basis of the second step;
step 3.2: compiling respective elastic energy calculation formulas of coal bodies and rocks in the coal-rock composite structure by using a fish language, and obtaining elastic energy distribution and maximum values of the coal and the rocks through post-processing;
step 3.3: and (4) comparing and analyzing respective stress distribution, displacement distribution, plastic zone and elastic energy distribution of the coal-rock models generated in the direct generation mode and the indirect generation mode.
6. The method for simulating the mechanical behavior and the energy evolution of the gas-containing coal-rock composite structure according to claim 5, wherein the stress distribution, the displacement distribution, the plastic region and the elastic energy distribution in the step 3.3 are all realized by slice arrangement of post-processing, and the slices are all axial slices along the center of the coal-rock composite structure.
7. The method for simulating the mechanical behavior and the energy evolution of the gas-bearing coal rock composite structure according to claim 5, wherein the fourth step comprises the following specific steps:
step 4.1: calculating the energy ratio of the rock elastic energy in the combined structure according to the maximum value of the coal rock elastic energy obtained in the step 3.2, wherein the calculation method is to divide the maximum value of the rock elastic energy by the maximum value of the coal body elastic energy;
step 4.2: and (4) carrying out comparative analysis on the energy ratio of the elastic energy of the rock in the combined structure in the coal rock model generated by the two modes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115795773A (en) * | 2022-01-20 | 2023-03-14 | 山东科技大学 | Analysis method for influence factors of roof elastic energy contribution rate during coal disaster |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115795773A (en) * | 2022-01-20 | 2023-03-14 | 山东科技大学 | Analysis method for influence factors of roof elastic energy contribution rate during coal disaster |
| CN115795773B (en) * | 2022-01-20 | 2023-06-23 | 山东科技大学 | Analysis method for influence factors of roof elastic energy contribution rate in coal disaster |
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