CN114820959B - Digital modeling method for multiple geological elements of rock burst mine - Google Patents
Digital modeling method for multiple geological elements of rock burst mine Download PDFInfo
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Abstract
The invention provides a method for digitally modeling multiple geological elements of a rock burst mine. Firstly, establishing a more accurate three-dimensional geologic body surface by utilizing three-dimensional design software, and stretching the three-dimensional surface to obtain a coal mine three-dimensional model without structural surface and layering information. And then establishing a truly spread fault structural plane and a fault surface plane through interpolation operation according to geological exploration information such as exploration drilling and the like, and extending the fault surface plane to the vicinity of the fault surface plane. And finally, combining geological elements such as earth surface, stratum and fault plane, performing unified mesh subdivision and mesh optimization on the model, and finally importing the model into numerical calculation software to construct the model. According to the invention, drilling data obtained by geological exploration of a coal mine are fully utilized, a truly fluctuant fault plane and a geological plane are obtained through interpolation operation, the defect of mesh subdivision of three-dimensional design software is overcome, and a new thought is provided for modeling multiple geological elements of a rock burst mine.
Description
Technical Field
The invention relates to the field of coal mine rock burst, in particular to a digital modeling method for multiple geological elements of a rock burst mine.
Background
Rock burst is a dynamic phenomenon with severe damage characteristics, which is generated by sudden release of deformation energy of coal rock mass around a coal mine roadway and a stope, and seriously threatens the safe production of coal mines. There are many geological factors affecting rock burst, including mine burial depth, coal seam thickness variation, fault structural plane distribution, etc.
The mine three-dimensional modeling is the basis for analyzing the mining stress distribution and the structural stability of the coal mine. For modeling of rock burst mines, geological factors related to coal seam exploitation, including relevant geological information such as rock stratum thickness, fault distribution and the like, are fully considered. However, the spatial information of various strata and geological structures in the pit is complex, the workload of restoring the spatial structure information of each geological element is large, and the difficulty is brought to the three-dimensional modeling of the rock burst mine.
Currently, two methods are generally adopted for three-dimensional modeling of a coal mine, and one method is modeling by utilizing a numerical simulation software with a command. These commands are only applicable to models describing structural rules, edge trim. For a geologic model with complex structure and extremely irregular boundary and stratum interfaces, the modeling command of the software is greatly restricted. Modeling by adopting the self-contained command has to simplify the geological conditions, even delete the geological elements, the real geological condition can not be reproduced, and the modeling accuracy is greatly reduced. Obviously, the three-dimensional geological model of the coal mine established by the method has the problems of incomplete geological elements and insufficient reduction degree of complex geological structures, and can not provide support for mining stress analysis and structure evolution of the rock burst mine.
Another modeling method is modeling by three-dimensional design software such as CAD, and the method forms an irregular layer by performing a stretching process on the section line of the formation. However, this method defaults to the fact that the relief of the formation in the direction of elongation does not change, unlike the case in the subsurface space. In addition, the three-dimensional design software has natural disadvantages in mesh subdivision, the mesh shape and density of the mesh subdivision of the three-dimensional design software are unreasonable, and the result precision of numerical simulation can be severely restricted by adopting the mesh model established by the method for calculation; some three-dimensional design software builds mesh models that even have only surface contours, which are hollow inside and cannot be used to simulate operations.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for digitally modeling multiple geological elements of a rock burst mine, which comprises the following steps:
s1, establishing a three-dimensional geological model containing surface relief by utilizing three-dimensional design software
S11, establishing a three-dimensional earth surface; according to the surface contour line data of the modeling area, the contour lines are equally divided, so that a certain number of line segments are obtained, the end points of all the line segments are extracted, and three-dimensional point cloud data of the surface contour line are obtained;
preferably, the contour is equally divided by a modeling minimum scale.
S12, generating a ground surface grid surface and a smooth transition three-dimensional ground surface curved surface from the three-dimensional point cloud data, stretching the ground surface curved surface to form a three-dimensional geologic body model which is not subjected to stratum segmentation;
s2, establishing a truly spread fault plane and stratum in the three-dimensional geological model
S21, establishing a fault plane, and establishing a fault plane of real spread in a modeling area through interpolation operation according to point coordinate information of fault positions and exploration drilling data;
s22, establishing a stratum, extracting drilling points on the same stratum interface according to exploration drilling data, generating the same stratum interface on the drilling points on the same stratum interface, establishing the stratum interface through interpolation operation, and establishing each stratum truly spread through adjacent stratum interfaces;
s23, extending stratum through which the fault passes to a fault plane;
s3, meshing the three-dimensional geological model
S31, performing primary rough subdivision on the three-dimensional geological model;
s32, optimizing and dissecting the surface grid by utilizing the surface grid optimization technology Gsurf operation in Griddle;
s33, generating a mine multi-geological element grid model by utilizing the Gvol function in the Griddle plugin;
s4, importing the mine multi-geological element grid model established in the step S3 into numerical simulation software.
The beneficial effects are that: the invention provides a method for digitally modeling multiple geological elements of a rock burst mine. Firstly, building a more accurate three-dimensional geologic body surface by utilizing modeling advantages of three-dimensional design software, and stretching the three-dimensional surface to obtain a coal mine three-dimensional model without structural surface and layering information. Secondly, according to geological exploration information such as exploration drilling and the like, a fault structural surface which is truly spread is established through interpolation operation. And then, according to the exploration drilling information, establishing each stratum surface of the real spread by interpolation operation, and extending the stratum surface through which the fault passes to the vicinity of the fault surface. And finally, combining geological elements such as earth surface, stratum and fault plane, adopting Griddle software to perform unified mesh subdivision and mesh optimization on the model, and importing the model into numerical calculation software to realize the construction of the model. According to the method, drilling data obtained by geological exploration of the coal mine are fully utilized, a fault structural plane and a geological layer which truly undulate are obtained through interpolation operation, the defect of mesh subdivision of three-dimensional design software is overcome, and a new thought is provided for modeling of multiple geological elements of the rock burst mine.
Drawings
FIG. 1 is a three-dimensional geologic volume model without stratigraphic segmentation;
FIG. 2 is a fault model created from points on a fault plane (circles in the figure are drill points);
FIG. 3 is a fault placed in a three-dimensional geologic volume;
FIG. 4 is a geological formation of the same lithology located on either side of a fault (circles in the figure are borehole points);
FIG. 5 is a plurality of formation face models generated in accordance with borehole coordinate information;
FIG. 6 is a three-dimensional geologic volume model comprising multiple geologic elements, according to the invention;
FIG. 7 is a three-dimensional geologic body model after optimization dissection of a surface mesh;
fig. 8 is a three-dimensional geologic volume model into which numerical simulation software is introduced.
Detailed Description
The technical scheme of the invention is described in more detail below with reference to the accompanying drawings in the embodiments of the invention.
A method for digitally modeling multiple geological elements of rock burst mines utilizes three-dimensional design software to establish the surface of an accurate three-dimensional geologic body, and stretches the three-dimensional surface to obtain a coal mine three-dimensional model without structural surface and layering information; according to geological exploration information such as exploration drilling and the like, establishing a fault structural plane of real spread through interpolation operation; according to geological exploration information such as exploration drilling and the like, establishing each stratum which is truly spread through interpolation operation, and extending the stratum through which the fault passes to the vicinity of the fault plane; combining geological elements such as earth surface, stratum and fault plane, adopting Griddle software to perform unified mesh subdivision and mesh optimization on the model, and importing the uniform mesh subdivision and mesh optimization into numerical calculation software to realize the construction of the model;
the method specifically comprises the following steps:
s1, establishing a three-dimensional geological model containing surface relief by utilizing three-dimensional design software
S11, establishing a three-dimensional earth surface; according to the surface contour line data of the modeling area, the contour lines are equally divided, so that a certain number of line segments are obtained, the end points of all the line segments are extracted, and three-dimensional point cloud data of the surface contour line are obtained;
preferably, the contour is equally divided by a modeling minimum scale.
S12, generating a ground surface grid surface and a smooth transition three-dimensional ground surface curved surface from the three-dimensional point cloud data in the step S11, stretching the ground surface curved surface to form a three-dimensional geologic body model which is not subjected to stratum segmentation, as shown in FIG. 1;
s2, establishing a truly spread fault plane and stratum in the three-dimensional geological model
S21, establishing a fault plane, and establishing a fault plane of real spread in a modeling area by interpolation operation according to point coordinate information of fault positions and exploration drilling data, wherein the fault plane is shown in figures 2-3;
s22, establishing a stratum, extracting drilling points on the same stratum interface according to exploration drilling data, generating the same stratum interface on the drilling points on the same stratum interface, establishing the stratum interface through interpolation operation, and establishing each stratum truly spread through adjacent stratum interfaces (each stratum is determined by two stratum interfaces which are adjacent up and down);
s23, extending the stratum through which the fault passes to a fault plane, as shown in fig. 4-6;
s3, meshing the three-dimensional geological model
S31, performing primary rough subdivision on the three-dimensional geological model, wherein the obtained grid shape is irregular and does not meet the requirement of simulation operation;
s32, optimizing and dissecting the surface grid by utilizing the surface grid optimization technology Gsurf operation in Griddle; as shown in fig. 7;
s33, generating a mine multi-geological element grid model by utilizing the Gvol function in the Griddle plugin;
s4, importing the mine multi-geological element grid model established in the step S3 into numerical simulation software; as shown in fig. 8.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (1)
1. The method is characterized in that the method firstly utilizes three-dimensional design software to build three-dimensional earth surface, and stretches the curved surface of the three-dimensional earth surface to obtain a coal mine three-dimensional geological model without structural surface and layering information; secondly, establishing a fault plane of real spread by interpolation operation according to the exploration drilling data; then, according to the exploration drilling data, each stratum which is truly spread is established through interpolation operation, and the stratum through which the fault passes is spread to a fault plane; finally, combining geological elements of the earth surface, stratum and fault surface, carrying out uniform mesh subdivision and mesh optimization on the model by adopting a Griddle plug-in, and importing the model into numerical simulation software to realize the construction of the model;
the method specifically comprises the following steps:
s1, establishing a three-dimensional geological model containing surface relief by utilizing three-dimensional design software:
s11, building a three-dimensional earth surface, dividing the contour line equally by modeling minimum scale according to earth surface contour line data of a modeling area, so as to obtain a certain number of line segments, extracting end points of all the line segments, and obtaining three-dimensional point cloud data of the earth surface contour line;
s12, generating a ground surface grid surface and a smooth transition three-dimensional ground surface curved surface from the three-dimensional point cloud data, stretching the three-dimensional ground surface curved surface, and forming a three-dimensional geological model which is not subjected to stratum segmentation;
s2, establishing a truly spread fault plane and stratum in the three-dimensional geological model:
s21, establishing a fault plane: according to the exploration drilling data, establishing a fault plane of real spread in a modeling area by interpolation operation according to point coordinate information of fault positions;
s22, establishing a stratum: extracting drilling points on the same stratum interface according to exploration drilling data, generating the same stratum interface on the same stratum interface, establishing the stratum interface through interpolation operation, and establishing each stratum in real spread through adjacent stratum interfaces;
s23, extending stratum through which the fault passes to a fault plane;
s3, carrying out grid division on the three-dimensional geological model:
s31, performing primary rough subdivision on the three-dimensional geological model;
s32, optimizing and dissecting the surface grid by utilizing a surface grid optimization technology Gsurf operation in the Griddle plug-in;
s33, generating a mine multi-geological element grid model by utilizing the Gvol function in the Griddle plugin;
s4, importing the mine multi-geological element grid model established in the step S33 into numerical simulation software.
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| CN101582173B (en) * | 2009-06-24 | 2012-07-11 | 中国石油天然气集团公司 | Block model building method for complex geological structure |
| CN104299255A (en) * | 2014-09-30 | 2015-01-21 | 长江岩土工程总公司（武汉） | Three-dimensional terrain model rendering method |
| CN110163966B (en) * | 2019-05-16 | 2022-12-09 | 中煤科工集团北京华宇工程有限公司 | Method for automatically establishing three-dimensional geological information model of coal mine by using point cloud data |
| CN111950051B (en) * | 2020-07-03 | 2022-07-01 | 成都理工大学 | BIM-based three-dimensional geological modeling and geological model-based construction application method |
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| CN114330078B (en) * | 2022-01-12 | 2023-03-24 | 煤炭科学研究总院有限公司 | Construction method of accurate numerical simulation model of mine coal face |
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| CN103514630A (en) * | 2013-10-16 | 2014-01-15 | 北京石油化工学院 | Fault structure three-dimensional modeling method |
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