CN115577497A - Coal rock stability detection method and system and storable medium - Google Patents
Coal rock stability detection method and system and storable medium Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting stability of a coal rock mass and a storable medium, which relate to the technical field of coal mining and comprise the following steps: acquiring data of a dead zone and establishing a three-dimensional model by a three-dimensional scanning technology; collecting typical rock samples of coal rock masses, and carrying out indoor rock mass mechanics test on dry and saturated coal rock mass test pieces to obtain basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses; according to the groundwater condition and the indoor rock mass mechanical test, evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion; and (3) carrying out fluid-solid coupling calculation analysis on the coal rock mass by using numerical simulation in combination with the three-dimensional shape, the water body condition, the geological condition and the rock mass mechanical property of the water-endowing dead zone to obtain the evaluation result of the stability of the coal rock mass. The technical scheme of the invention can carry out precise detection on the coal mine goaf, analyze the stability of the coal and rock mass and provide technical guarantee and safety support for the safety production of the coal mine.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a coal-rock mass stability detection method and system and a storable medium.
Background
The safety production is the central importance in coal mine operation, and coal is taken as an important basic energy source, is dominant in a primary energy structure, and has an irreplaceable effect in national economic development. After the underground coal seam is mined, a large-area goaf can be formed, the specific water depth of water supply in the goaf and the condition that the change of the mechanical property of surrounding rock mass after water soaking are unknown, so that the water supply goaf becomes a great potential safety hazard of the goaf close to stopes and roadway coal rock stability, serious geological disasters and ecological environment problems such as surface subsidence, mountain landslide, underground water loss, land desertification, vegetation damage and the like are easily caused, the normal production and life of mining areas and surrounding people are influenced, the economic development, social stability and the sustainable development of ecological environment of the mining areas are restricted, and the high importance of all departments is aroused.
The accurate acquisition of the three-dimensional form and the water content of the dead zone is an important link for ensuring the mining work and the subsequent maintenance work of the mine, and the mechanical property and the mechanical parameters of the rock mass are important factors for determining the stability of geotechnical engineering. Only by accurately knowing the distribution and the spatial form adjustment of the underground mined-out area of the mine, processing measures can be taken in a targeted manner to eliminate hidden dangers. Due to low visibility inside the dead zone, poor ventilation condition and no communication condition, the personal safety of measuring personnel and the safety of surveying and mapping production are difficult to guarantee due to the reason of communication and communication in the traditional measuring technical means, the method cannot be suitable for measurement inside the dead zone, cannot meet the requirements of research and development, and must explore and adopt a new technology.
Therefore, how to realize the precise detection of the goaf and the analysis of the stability of the coal-rock mass and provide technical support and safety support for the safety production of the coal mine is a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides a method and a system for detecting the stability of a coal rock mass and a storable medium, which can perform precise detection on a coal mine goaf, analyze the stability of the coal rock mass and provide technical support and safety support for the safety production of a coal mine.
In order to achieve the above purpose, the invention provides the following technical scheme:
a coal-rock mass stability detection method comprises the following steps:
acquiring vacant area data and establishing a three-dimensional model by a three-dimensional scanning technology;
collecting typical rock samples of coal rock masses, and carrying out indoor rock mass mechanics test on dry and saturated coal rock mass test pieces to obtain basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses;
according to the groundwater condition and the indoor rock mass mechanical test, evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion;
and (4) carrying out fluid-solid coupling calculation analysis on the coal rock mass by using numerical simulation in combination with the three-dimensional shape of the water-endowing empty area, the water body condition, the geological condition and the rock mass mechanical property to obtain the evaluation result of the coal rock mass stability.
The technical effect that above-mentioned technical scheme reaches does: the stability of the adjacent area of the goaf of the coal mine can be analyzed, and technical support and safety support are provided for safety production of the coal mine.
Optionally, the establishing of the three-dimensional model specifically includes the following steps:
according to the position of a coal mine goaf, combining with a site drain hole to drill, and performing three-dimensional scanning on the coal mine goaf by using a laser point cloud technology to obtain point cloud data;
and interpreting and filtering the point cloud data by using three-dimensional geological software, and establishing a three-dimensional geometric model of the water body and the goaf of the water-endowing goaf by combining geological data and a previous construction drawing.
The technical effect that above-mentioned technical scheme reaches does: the laser scanning head can rotate horizontally and vertically by 360 degrees after extending into the goaf until the scanning work of the whole goaf is completed, the goaf can be precisely detected, the three-dimensional form of the goaf is obtained, and a three-dimensional model is constructed.
Optionally, the obtaining of the basic rock mechanical parameter index and permeability coefficient of the coal rock mass specifically includes the following steps:
according to the core condition of geological drilling, collecting a rock sample of a typical rock mass, carrying out an indoor rock loading and unloading experiment on the rock sample, and obtaining basic rock mechanical parameter indexes of the typical rock mass of a coal mine;
and (4) developing a permeability characteristic mechanics experiment of the coal rock mass by using a fluid-solid coupling pressure tester to obtain the permeability coefficient of the coal rock mass.
Optionally, the basic rock mechanical parameter indexes include compressive strength, tensile strength, elastic modulus, cohesion and internal friction angle.
Optionally, the macroscopic mechanical parameter evaluation of the coal rock mass specifically includes the following steps:
taking the basic rock mechanical parameter index and permeability coefficient of the coal rock mass as the mechanical property of the coal rock mass, and obtaining the geological structure characteristics of the coal bed through field geological data;
and based on the obtained coal bed geological structure characteristics and the coal rock mass mechanical characteristics, obtaining the macroscopic mechanical parameters of the coal rock mass by adopting an H-B criterion so as to carry out quantitative expression on the typical coal rock mass mechanical characteristics and provide basic data support for numerical simulation analysis.
Optionally, the obtaining of the evaluation result of the coal rock stability specifically includes the following steps:
carrying out stability research on coal rock mass of the water-bearing dead zone based on fluid-solid coupling by using FLAC3D software, and acquiring distribution characteristics of a surrounding rock displacement field and a stress field of the coal rock mass of the adjacent area of the water-bearing dead zone by using a numerical simulation calculation means;
and (3) calculating the rock mass stress value and the plastic zone variation range of the goaf through FLAC3D numerical simulation to obtain the coal rock mass stability evaluation result.
The technical effect that above-mentioned technical scheme reaches does: the stability of rock mass around the water-endowing dead zone can be calculated by utilizing a fluid-solid coupling method, safety evaluation is provided, the collapse rule of the dead zone can be further researched, the water accumulation of the dead zone is predicted in advance, corresponding water yield is provided for a production center, the size of a drain pipe in a roadway is reasonably arranged, the drain pipe is prevented from being laid by repeated operation, and meanwhile, safety production is guaranteed.
The invention also provides a coal rock stability detection system, which comprises: the device comprises a model building module, a test module, an evaluation module and a stability evaluation module, wherein all the structures are connected in sequence;
the model establishing module acquires the dead zone data and establishes a three-dimensional model through a three-dimensional scanning technology;
the test module is used for collecting rock samples of typical coal rock masses, performing indoor rock mass mechanics test on dry and saturated coal rock mass test pieces, and obtaining basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses;
the evaluation module is used for evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion according to the underground water condition and the indoor rock mass mechanical test;
the stability evaluation module is used for carrying out fluid-solid coupling calculation analysis on the coal rock mass by utilizing numerical simulation through combining the three-dimensional shape of the water-endowing empty area, the water body condition, the geological condition and the rock mass mechanical property, and obtaining the evaluation result of the coal rock mass stability.
Optionally, the basic rock mechanics parameter indices include compressive strength, tensile strength, elastic modulus, cohesion and internal friction angle.
The invention also provides a computer-storable medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above coal-rock mass stability detection method.
According to the technical scheme, compared with the prior art, the invention discloses the method and the system for detecting the stability of the coal rock mass and the storable medium, and the method and the system have the following beneficial effects:
(1) The method can accurately model the three-dimensional form of the coal mine goaf, obtain the osmotic mechanical property of the unloading rock mass through the three-axis fluid-solid coupling pressure testing machine, comprehensively, scientifically and systematically evaluate the mechanical parameters of the coal mine rock mass by utilizing the H-B strength criterion, and finally analyze the stability of the coal rock mass in the adjacent area of the coal mine goaf by utilizing the fluid-solid coupling numerical simulation method, thereby providing technical support and safety support for the safety production of the coal mine;
(2) The invention adopts three-dimensional laser to detect the goaf, and a goaf laser three-dimensional scanner can transmit and receive laser and record the goaf coordinate information of a reflection point through software; the laser scanning head can horizontally and vertically rotate by 360 degrees after extending into the goaf until the scanning work of the whole goaf is completed, and then a three-dimensional goaf model is constructed in modeling software by processing and editing the scanning data, so that the precise detection of the goaf can be realized;
(3) The invention can further research the collapse rule of the goaf, predict the water accumulation amount of the goaf in advance, provide corresponding water yield for a production center, reasonably arrange the size of the drainage pipe in the roadway, avoid laying the drainage pipe by repeated operation and provide guarantee for safe production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for detecting stability of a coal-rock mass;
FIG. 2 is a structural diagram of a coal-rock mass stability detection system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In the early engineering goaf detection, a drilling technology is mainly adopted, more and more mines are applied by a geophysical technology to detect the goaf in recent years, various geophysical methods are widely applied according to respective advantages, but the geophysical methods are often limited by complex geological environments, mutual verification needs to be performed by combining multiple methods, the detection result precision is low, professional explanation needs to be performed on the obtained data after detection is completed, the labor amount is large, the process is complicated, the detected goaf boundary is often two-dimensional or even one-dimensional qualitative data, the visualization effect is poor, and a three-dimensional graph used for accurately analyzing the goaf cannot be accurately drawn.
For underground coal mines, a water-bearing goaf is a major potential safety hazard of the stability of coal rocks of a goaf near a stope and a roadway, and the accurate acquisition of the three-dimensional form and the water content of the goaf is a key for evaluating the stability of the goaf, the near stope and the roadway. Therefore, the embodiment of the invention discloses a method for detecting the stability of a coal rock mass, which comprises the following steps as shown in figure 1:
acquiring data of a dead zone and establishing a three-dimensional model by a three-dimensional scanning technology;
collecting typical rock samples of coal rock masses, and carrying out indoor rock mass mechanics test on dry and saturated coal rock mass test pieces to obtain basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses;
according to the groundwater condition and the indoor rock mass mechanical test, evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion;
and (4) carrying out fluid-solid coupling calculation analysis on the coal rock mass by using numerical simulation in combination with the three-dimensional shape of the water-endowing empty area, the water body condition, the geological condition and the rock mass mechanical property to obtain the evaluation result of the coal rock mass stability.
Further, the establishment of the three-dimensional model specifically comprises the following steps:
according to the position of a coal mine goaf, combining with a site drain hole to drill, and performing three-dimensional scanning on the coal mine goaf by using a laser point cloud technology to obtain point cloud data; and interpreting and filtering the point cloud data by using three-dimensional geological software, and establishing a three-dimensional geometric model of the water body and the goaf of the water-bearing goaf by combining geological data and a construction map in the early stage.
The three-dimensional laser scanner adopts a high-speed non-contact laser measurement method, can perform 360-degree panoramic rapid scanning on a complex object in a three-dimensional space, can acquire laser scanning point cloud data in real time, performs point cloud filtering, splicing and three-dimensional modeling on the point cloud data through reverse engineering software or mining engineering software to acquire the three-dimensional shape of the object in the three-dimensional space, can accurately scan the actual spatial distribution condition of the complex dead zone, and can visualize the underground blind dead zone by scanning the obtained three-dimensional point cloud data and the generated three-dimensional surface model of the complex dead zone to provide more visual digital information. Therefore, the goaf detection is carried out by using the three-dimensional laser detection method, the accuracy, reliability and practicability of goaf detection data can be improved, the traditional qualitative detection is improved to the level of accurate three-dimensional positioning, and detailed information can be provided for continuous safe mining of goaf coal mines.
Further, the method for acquiring the basic rock mechanical parameter index and permeability coefficient of the coal rock mass specifically comprises the following steps:
according to the core condition of geological drilling, collecting rock samples of typical coal rock masses, carrying out indoor rock loading and unloading experiments on the rock samples (soaking experiments can be carried out on the unloading coal rock masses, uniaxial compression, direct shear and Brazilian splitting experiments can be carried out on dry and saturated test pieces), and obtaining basic rock mechanical parameter indexes of the coal mine typical coal rock masses; and (3) developing a permeability characteristic mechanics experiment of the coal rock mass by using a triaxial fluid-solid coupling pressure testing machine to obtain the permeability coefficient of the coal rock mass. The basic rock mechanics parameter indexes comprise compression strength, tensile strength, elastic modulus, cohesion, internal friction angle and the like.
Further, the macroscopic mechanical parameter evaluation of the coal rock mass specifically comprises the following steps:
taking the basic rock mechanical parameter index and permeability coefficient of the coal rock mass as the mechanical property of the coal rock mass, and obtaining the geological structure characteristics of the coal bed through on-site geological data; based on the obtained coal seam geological structure characteristics and the coal rock mass mechanical characteristics, macroscopic mechanical parameters of the coal rock mass are obtained by adopting an H-B criterion so as to carry out quantitative expression on the mechanical characteristics of the typical coal rock mass and provide basic data support for numerical simulation analysis.
Further, the method for obtaining the coal rock stability evaluation result specifically comprises the following steps:
carrying out stability research on coal rock mass of the water-bearing dead zone based on fluid-solid coupling by using FLAC3D software, and acquiring distribution characteristics of a surrounding rock displacement field and a stress field of the coal rock mass of the adjacent area of the water-bearing dead zone by using a numerical simulation calculation means; and (3) calculating the rock mass stress value and the plastic zone variation range of the goaf through FLAC3D numerical simulation to obtain the coal rock mass stability evaluation result.
In addition, the collapse form and the collapse range of the goaf can be further predicted, the collapse rule of the goaf is researched, the accumulated water quantity of the goaf is predicted in advance, the corresponding water yield is provided for a production center, the size of the drainage pipe in the roadway is reasonably arranged, the drainage pipe is prevented from being laid by repeated operation, and meanwhile, the guarantee is provided for safe production.
The present embodiment discloses a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the coal-rock mass stability detection method described above.
Specifically, the experimental equipment available in this embodiment is based on conventional rock indoor experimental equipment, and further includes a YAG-3000 microcomputer controlled rock stiffness testing machine, a temperature-stress-seepage-chemical corrosion coupled rock triaxial rheological testing system, a servo-controlled rock direct shear testing machine, a similar material model testing stand, a high-stress hard rock true triaxial testing system, a Rockman 2000 type high-pressure triaxial system and the like, wherein the stress in three directions of the high-stress true triaxial testing system can be independently loaded and controlled, the maximum pressures in the three directions are 1000MPa, 1000MPa and 100MPa respectively, and the problem of high-stress loading is effectively solved. In addition, the system also comprises a Hyperion HNSI type acoustic emission system (high frequency 125Hz-750 kHz), a 24-channel high-frequency-range SH-II acoustic emission system and a microseismic (low frequency 10 Hz) monitoring equipment data acquisition system, and the instrument and the equipment provide a hardware platform for researching mechanical characteristics of hard rock aging damage disasters. Meanwhile, 1800 associative parallel computers (32 dual-core CPUs with 8000 hundred million floating point operation speeds and 4TG fiber disk arrays per second), a 3GSM digital photography scanning system, a multi-physical field coupling analysis finite element software system Comsol multiprotics 3.5, a software system Gocad for geological modeling and virtual reality, geo Studio 6.0 software for rock stability analysis, and numerical analysis software such as FLAC, UDEC, and PFC can be configured, so that a good software platform can be provided for fine numerical analysis and program development work of the embodiment, and results can also be obtained by using other experimental equipment, which is not limited here.
Example 2
The embodiment of the invention discloses a coal rock stability detection system, as shown in figure 2, comprising: the device comprises a model building module, a test module, an evaluation module and a stability evaluation module, wherein all the structures are connected in sequence;
the model establishing module acquires the dead zone data and establishes a three-dimensional model through a three-dimensional scanning technology;
the test module is used for collecting rock samples of typical coal rock masses, performing indoor rock mass mechanics test on dry and saturated coal rock mass test pieces, and obtaining basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses;
the evaluation module is used for evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion according to the underground water condition and the indoor rock mass mechanical test;
the stability evaluation module is used for carrying out fluid-solid coupling calculation analysis on the coal rock mass by utilizing numerical simulation through combining the three-dimensional shape of the water-bearing empty area, the water condition, the geological condition and the mechanical property of the rock mass, and obtaining the evaluation result of the stability of the coal rock mass.
Specifically, the basic rock mechanical parameter indexes comprise compressive strength, tensile strength, elastic modulus, cohesion, internal friction angle and the like.
Based on the above contents, the technical scheme can accurately model the three-dimensional form of the coal mine goaf, obtain the osmotic mechanical property of the unloading rock mass through the three-axis fluid-solid coupling pressure testing machine, comprehensively, scientifically and systematically evaluate the mechanical parameters of the coal mine rock mass by utilizing the H-B strength criterion, and finally analyze the stability of the coal rock mass in the adjacent area of the coal mine goaf by utilizing the fluid-solid coupling numerical simulation method, thereby providing technical support and safety support for the safety production of the coal mine.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A coal rock mass stability detection method is characterized by comprising the following steps:
acquiring vacant area data and establishing a three-dimensional model by a three-dimensional scanning technology;
collecting typical rock samples of coal rock masses, and carrying out indoor rock mass mechanics test on dry and saturated coal rock mass test pieces to obtain basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses;
according to the groundwater condition and the indoor rock mass mechanical test, evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion;
and (4) carrying out fluid-solid coupling calculation analysis on the coal rock mass by using numerical simulation in combination with the three-dimensional shape of the water-endowing empty area, the water body condition, the geological condition and the rock mass mechanical property to obtain the evaluation result of the coal rock mass stability.
2. The method for detecting the stability of the coal-rock mass according to claim 1, wherein the establishment of the three-dimensional model specifically comprises the following steps:
according to the position of a coal mine goaf, combining with a site drain hole to drill, and performing three-dimensional scanning on the coal mine goaf by using a laser point cloud technology to obtain point cloud data;
and interpreting and filtering the point cloud data by using three-dimensional geological software, and establishing a three-dimensional geometric model of the water body and the goaf of the water-bearing goaf by combining geological data and a construction map in the early stage.
3. The method for detecting the stability of the coal rock mass according to claim 1, wherein the step of obtaining the basic rock mechanical parameter index and the permeability coefficient of the coal rock mass specifically comprises the following steps:
according to the core condition of geological drilling, collecting typical rock mass rock samples, carrying out indoor rock loading and unloading experiments on the rock samples, and obtaining basic rock mechanical parameter indexes of the typical coal rock mass in a coal mine;
and (3) carrying out a mechanical experiment of the permeability characteristics of the coal rock mass by using a fluid-solid coupling pressure tester to obtain the permeability coefficient of the coal rock mass.
4. The method for detecting the stability of the coal rock mass according to claim 1, wherein the basic rock mechanical parameter indexes comprise compressive strength, tensile strength, elastic modulus, cohesion and internal friction angle.
5. The coal-rock mass stability detection method according to claim 1, wherein the macroscopic mechanical parameter evaluation of the coal-rock mass specifically comprises the following steps:
taking the basic rock mechanical parameter index and permeability coefficient of the coal rock mass as the mechanical property of the coal rock mass, and obtaining the geological structure characteristics of the coal bed through field geological data;
and based on the obtained coal seam geological structure characteristics and the coal rock mass mechanical characteristics, obtaining macroscopic mechanical parameters of the coal rock mass by adopting an H-B rule so as to quantitatively express the typical coal rock mass mechanical characteristics.
6. The method for detecting the stability of the coal rock mass according to claim 1, wherein the step of obtaining the evaluation result of the stability of the coal rock mass specifically comprises the following steps:
carrying out stability research on coal rock mass of the water-bearing dead zone based on fluid-solid coupling by using FLAC3D software, and acquiring distribution characteristics of a surrounding rock displacement field and a stress field of the coal rock mass of the adjacent area of the water-bearing dead zone by using a numerical simulation calculation means;
and (3) calculating the rock mass stress value and the plastic zone variation range of the goaf through FLAC3D numerical simulation to obtain the coal rock mass stability evaluation result.
7. A coal petrography body stability detecting system which characterized in that includes: the device comprises a model building module, a test module, an evaluation module and a stability evaluation module, wherein all the structures are connected in sequence;
the model establishing module acquires the dead zone data and establishes a three-dimensional model through a three-dimensional scanning technology;
the test module is used for collecting rock samples of typical coal rock masses, performing indoor rock mass mechanics test on dry and saturated coal rock mass test pieces, and obtaining basic rock mechanics parameter indexes and permeability coefficients of the coal rock masses;
the evaluation module is used for evaluating the macroscopic mechanical parameters of the coal rock mass by adopting an H-B strength criterion according to the underground water condition and the indoor rock mass mechanical test;
the stability evaluation module is used for carrying out fluid-solid coupling calculation analysis on the coal rock mass by utilizing numerical simulation through combining the three-dimensional shape of the water-bearing empty area, the water condition, the geological condition and the mechanical property of the rock mass, and obtaining the evaluation result of the stability of the coal rock mass.
8. The system of claim 7, wherein the basic rock mechanical parameters include compressive strength, tensile strength, elastic modulus, cohesion and internal friction angle.
9. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the coal rock mass stability testing method according to any one of claims 1 to 6.
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| CN116431567A (en) * | 2023-06-12 | 2023-07-14 | 煤炭科学研究总院有限公司 | Coal rock data acquisition, management and evaluation method based on digital rock mechanics |
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| CN116431567A (en) * | 2023-06-12 | 2023-07-14 | 煤炭科学研究总院有限公司 | Coal rock data acquisition, management and evaluation method based on digital rock mechanics |
| CN116431567B (en) * | 2023-06-12 | 2023-09-29 | 煤炭科学研究总院有限公司 | Coal rock data acquisition, management and evaluation method based on digital rock mechanics |
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