CN115079285B - Dynamic prediction method for coal bed gas outburst danger visualization area - Google Patents
Dynamic prediction method for coal bed gas outburst danger visualization area Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
Abstract
The invention discloses a dynamic prediction method for a coal bed gas outburst danger visualization area, which comprises the following steps: selecting a coal seam of the same mine non-dangerous working face of a coal seam to be tested to carry out direct current method testing, and determining a visual prediction criterion of outburst danger; drilling and sampling the coal seam to be tested along the tunneling direction, and testing apparent resistivity parameters of each sampling point; establishing a coal bed geoelectricity model, and performing apparent resistivity forward modeling calculation to obtain apparent resistivity distribution of a region to be measured; arranging a survey line at the bottom drainage roadway below the coal seam to be measured, carrying out multiple times of direct current electrical method detection and carrying out inversion calculation to obtain an apparent resistivity distribution map of the region to be measured; determining a low resistance abnormal area and a high resistance abnormal area of the area to be detected by combining the positive inversion calculation result, and respectively taking conflict elimination measures; and (4) carrying out direct current dynamic prediction on the coal body after the measures are implemented until the outburst elimination is completed. The invention relates to the technical field of coal seam tunneling outburst danger visualization detection, and can realize dynamic prediction of a coal seam gas outburst danger visualization area.
Description
Technical Field
The invention relates to the technical field of coal seam tunneling outburst danger visualization detection, in particular to a dynamic prediction method for a coal seam gas outburst danger visualization area.
Background
In the mining process, coal and gas outburst disasters on a tunneling working face have great destructiveness, and the outburst seriously threatens the personal safety of operating personnel and is a great obstacle to ensuring safety production of mines.
The existing outburst danger prediction method for the coal roadway tunneling process mainly adopts drilling test, namely point prediction is used for driving working face prediction, the outburst danger area in front of a coal seam in the tunneling process is not strongly detected, the prediction result is difficult to react to cause outburst danger, and a targeted measure cannot be provided.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a dynamic prediction method for a visualized area of coal seam gas outburst risk, which combines direct current electrical detection inversion with forward modeling technology, and utilizes the visualization principle to realize dynamic prediction of the visualized area of coal seam gas outburst risk.
To solve the above technical problem, an embodiment of the present invention provides the following solutions:
a dynamic prediction method for a coal seam gas outburst danger visualization area comprises the following steps:
s101, selecting a coal seam of the same mine non-dangerous working face of a coal seam to be tested to perform direct current electrical testing, testing apparent resistivity characteristics of the coal seam, and determining a visual prediction criterion of outburst danger;
s102, drilling and sampling the coal seam to be tested along the tunneling direction, and testing apparent resistivity parameters of each sampling point;
s103, establishing a coal bed geoelectricity model, and performing apparent resistivity forward modeling calculation to obtain apparent resistivity distribution of the area to be measured; the area to be detected refers to an area of a coal seam to be tunneled;
s104, arranging a measuring line at the bottom of the coal seam to be measured in a roadway drawing mode, carrying out multiple direct current electrical method detection on the region to be measured, and carrying out inversion calculation to obtain an apparent resistivity distribution map of the region to be measured;
s105, determining a low-resistance abnormal area and a high-resistance abnormal area of the area to be measured by combining the results of forward simulation calculation and inversion calculation, and drawing an image of the outburst danger of the area to be measured according to a visual forecasting criterion of the outburst danger;
s106, respectively taking pressure relief or extraction outburst elimination measures according to the determined low-resistance abnormal area and high-resistance abnormal area;
and S107, dynamically predicting the outburst risk of the coal body after the measures are implemented by a direct current method until the outburst elimination is completed.
Preferably, the step S101 specifically includes:
selecting a coal seam of the same mine non-dangerous working face of a coal seam to be tested to perform direct current testing, and determining a resistivity distribution interval of the coal seam of the non-dangerous working face;
and determining a visual prediction criterion for testing the outburst risk of the coal seam according to the safety of the corresponding resistance value abnormal area, wherein the outburst risk exists in the area exceeding the upper limit and the lower limit of the coal seam resistivity distribution area of the danger-free working face.
Preferably, the step S102 specifically includes:
drilling and sampling the coal seam to be tested along the tunneling direction, testing by a direct current method, and obtaining apparent resistivity parameters of each sampling point in an averaging mode;
the sampling should be uniform along the heading direction to ensure that the sampling area covers the area to be tunneled.
Preferably, the step S103 specifically includes:
establishing a coal bed physical model according to the thickness and the distribution of the coal bed;
endowing each sampling point obtained by testing with the physical model of the coal bed according to the resistivity parameters to obtain a geoelectric model of the coal bed;
and performing forward simulation calculation on the coal bed electric model after assignment to obtain apparent resistivity distribution of the area to be measured.
Preferably, the step S104 specifically includes:
the area to be detected is an area in front of tunneling and needing to detect outburst danger, and the length of the area to be detected islWhen the measuring line is arranged at the bottom drainage lane below the coal seam to be measured, if the distance between the bottom drainage lane and the coal seam to be measured is equal tohThen measuring the length of the wireLShould satisfyL>l+3h, the electrode distance on the measuring line is 2m, and the number of the arranged electrodes isL/2；
Carrying out direct current detection on the area to be detected for multiple times, wherein the time interval of each test exceeds 2 hours; and averaging the measured data, and performing inversion calculation to obtain a visual resistivity distribution map of the region to be measured so as to realize visualization of the resistivity distribution of the region to be measured.
Preferably, the step S105 specifically includes:
according to the visual prediction criterion of the outburst danger, a coal seam of the same mine non-dangerous working face of a coal seam to be detected is selected by S101 to be tested through a direct current electrical method to determine the apparent resistivity distribution interval of the coal seam of the non-dangerous working face, and the outburst danger exists in the area where the resistivity of the coal seam of the tested working face exceeds the resistivity distribution interval of the coal seam of the non-dangerous working face;
comparing and subtracting the results of forward simulation calculation and inversion calculation with the visual prediction criterion of the outburst risk to determine a low-resistance abnormal area and a high-resistance abnormal area in the area to be detected; the low-resistance abnormal region comprises a crushing region and a gas-containing region, and the high-resistance abnormal region comprises a stress concentration region;
and predicting the outburst risk according to the direct current method test result of the area to be tested.
Preferably, the step S106 specifically includes:
and adopting a pressure relief outburst elimination measure for the low-resistance abnormal area, and adopting an extraction outburst elimination measure for the high-resistance abnormal area.
Preferably, the step S107 specifically includes:
and (4) carrying out direct current test on the outburst elimination area 1 time a day, dynamically predicting the outburst elimination condition until the outburst elimination is completed, and continuing excavation to achieve the purpose of visual dynamic prediction.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the method, the apparent resistivity distribution condition of the tunneling front coal seam is monitored and inverted for multiple times by adopting a direct current electrical method, meanwhile, an earth electrical model is established for forward simulation calculation, forward modeling and inversion are combined, contrast is carried out on the forward simulation model and the inversion with a visual prediction criterion of the outburst risk, the outburst risk of the tunneling front coal seam is analyzed, and the effect of visualizing the outburst risk can be achieved by observing a visual resistivity difference diagram.
According to the invention, different resistance regions are analyzed according to the apparent resistivity difference distribution condition, the prominent reason of the corresponding resistance region is judged, and corresponding outburst elimination measures are provided accordingly, so that the aim of pertinently eliminating the outburst is well fulfilled.
On the whole, the invention is a visible, dynamic and symptomatic outburst prevention and treatment method, and the large-scale popularization and application of the method can generate great safety benefit and economic benefit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for dynamically predicting a gas outburst risk visualization area of a coal seam according to an embodiment of the present invention;
fig. 2 is a schematic layout diagram of a direct current electrical method detection system provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a specific operation process of the method for dynamically predicting the coal bed gas outburst risk visualization area according to the embodiment of the invention.
Description of reference numerals: 1. a coal seam to be detected; 2. a bottom suction lane; 3. a region to be tested; 4. measuring a line; 5. an electrode; 6. and (5) tunneling a roadway.
As shown in the drawings, in order to clearly implement the structures of the embodiments of the present invention, specific structures and devices are marked in the drawings, which are only for illustration purpose and are not intended to limit the present invention to the specific structures, devices and environments, and those skilled in the art can adjust or modify the devices and environments according to specific needs, and the adjusted or modified devices and environments still include the protection scope of the present invention.
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.
The embodiment of the invention provides a dynamic prediction method for a coal bed gas outburst danger visualization area, namely, the dynamic detection inversion of a direct current method is combined with a modeling forward operation technology, and the visualization principle is utilized to solve the problems that the existing outburst prevention and control technology is not strong in regional representation and cannot provide targeted measures. The flow chart of the method is shown in fig. 1, and comprises the following steps:
s101, selecting a coal seam of the same mine non-dangerous working face of a coal seam to be tested to perform direct current electrical testing, testing apparent resistivity characteristics of the coal seam, and determining a visual prediction criterion of outburst danger;
s102, drilling and sampling the coal seam to be tested along the tunneling direction, and testing apparent resistivity parameters of each sampling point;
s103, establishing a coal bed geoelectricity model, and performing apparent resistivity forward modeling calculation to obtain apparent resistivity distribution of the area to be measured; the area to be detected refers to an area of a coal seam to be tunneled;
s104, arranging a measuring line at the bottom of the coal seam to be measured in a roadway drawing mode, carrying out multiple direct current electrical method detection on the region to be measured, and carrying out inversion calculation to obtain an apparent resistivity distribution map of the region to be measured;
s105, determining a low-resistance abnormal area and a high-resistance abnormal area of the area to be measured by combining the results of forward simulation calculation and inversion calculation, and drawing an image of the outburst danger of the area to be measured according to a visual forecasting criterion of the outburst danger;
s106, taking outburst elimination measures of pressure relief or extraction according to the determined low-resistance abnormal area and high-resistance abnormal area;
and S107, dynamically predicting the outburst risk of the coal body after the measures are implemented by a direct current method until the outburst elimination is completed.
According to the method, the apparent resistivity distribution condition of the coal seam in front of the tunneling is monitored and inverted for multiple times by adopting a direct current method, an earth electric model is established for forward simulation calculation, forward modeling and inversion are combined, contrast is carried out on the forward modeling and the inversion with a visual prediction criterion of outburst risk, the outburst risk of the coal seam in front of the tunneling is analyzed, corresponding outburst elimination measures are given, and meanwhile, the visual effect of the outburst risk can be achieved by observing an apparent resistivity difference diagram.
Fig. 2 is a schematic layout diagram of a direct current electrical method detection system, and fig. 3 is a schematic diagram of a specific operation process of the method, as an embodiment of the present invention. The method comprises the following specific implementation processes:
selecting a coal seam 1 to be tested and a coal seam of a same mine non-dangerous working face to carry out electrical test, taking the mean value to determine a resistivity distribution interval of the coal seam of the non-dangerous working face, determining a visual prediction criterion of the outburst danger of the tested coal seam according to the safety of a corresponding resistance abnormal area, wherein the outburst danger exists in an area exceeding the upper limit and the lower limit of the resistivity distribution interval of the coal seam of the non-dangerous working face;
in a driving roadway 6, drilling and sampling a coal seam 1 to be tested along the driving direction, carrying out direct current method testing, and obtaining apparent resistivity parameters of each sampling point in an averaging mode; the sampling should be carried out uniformly along the tunneling direction, so that the sampling area is ensured to cover the area to be tunneled;
establishing a coal bed earth model, and performing apparent resistivity forward modeling calculation to obtain apparent resistivity distribution of a region to be measured; the method specifically comprises the following steps: establishing a coal bed physical model according to the thickness and the distribution of the coal bed; endowing each sampling point apparent resistivity parameter obtained by testing to the coal bed physical model to obtain a coal bed geoelectricity model; performing forward simulation calculation on the assigned coal bed geoelectric model to obtain apparent resistivity distribution of the area to be measured;
arranging a direct current method measuring line 4 and an electrode 5 in a bottom drawing lane 2 below a coal seam 1 to be measured, so that a region 3 to be measured covers a region to be tunneled;
the arrangement method of the direct current method test system comprises the following steps: the area to be detected 3 (i.e. the area to be tunneled) is the area in front of the tunneling and needs to detect the outburst danger, and the length islWhen the coal seam is detected, the measuring line 4 is arranged on the bottom suction lane 2 below the coal seam to be detected, if the distance between the bottom suction lane 2 and the coal seam 1 to be detected is equal tohThen measuring the length of the line 4LShould satisfyL>l+3h, the distance between the electrodes 5 on the measuring line is 2m, and the number of the arranged electrodes 5 isL /2；
Carrying out direct current method detection on the area to be detected 3 for multiple times, wherein the time interval of each test exceeds 2 hours; averaging the measured data, and carrying out inversion calculation to obtain a 3 apparent resistivity distribution map of the region to be measured so as to realize visualization of 3 apparent resistivity distribution of the region to be measured;
comparing and subtracting the result of forward simulation calculation and inversion calculation with the visual prediction criterion of the outburst risk, and determining a low-resistance abnormal area (a crushing area and an area containing gas) and a high-resistance abnormal area (a stress concentration area) in the area 3 to be detected;
predicting the outburst danger according to the test result of the direct current method of the area to be tested;
adopting a pressure relief and outburst elimination measure for a low-resistance abnormal region (a crushing region and a gas-containing region), and adopting an extraction and outburst elimination measure for a high-resistance abnormal region (a stress concentration region);
and (4) continuously carrying out direct current test on the outburst elimination area for 1 time every 1 day, dynamically predicting the outburst elimination condition until the outburst elimination is completed, and continuously excavating to achieve the purpose of visual dynamic prediction.
In the embodiment of the invention, the apparent resistivity distribution condition of the tunneling front coal seam is monitored and inverted for multiple times by adopting a direct current electrical method, an earth electrical model is established for forward simulation calculation, forward modeling and inversion are combined, contrast is carried out on the forward modeling and the inversion and a visual prediction criterion of the outburst risk, the outburst risk of the tunneling front coal seam is analyzed, and the visual effect of the outburst risk can be achieved by observing a visual resistivity difference diagram.
According to the invention, different resistance regions are analyzed according to the apparent resistivity difference distribution condition, the prominent reason of the corresponding resistance region is judged, and corresponding outburst elimination measures are provided accordingly, so that the aim of pertinently eliminating the outburst is well fulfilled.
On the whole, the invention is a visible, dynamic and symptomatic outburst prevention and treatment method, and the large-scale popularization and application of the method can generate huge safety benefit and economic benefit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal apparatus. Without further limitation, an element defined by the phrases "comprising one of \ 8230; \8230;" does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
References in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the relevant art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
In general, terms may be understood at least in part from the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending, at least in part, on the context. Additionally, the term "based on" may be understood as not necessarily intended to convey an exclusive set of factors, but may instead allow for the presence of other factors not necessarily explicitly described, depending at least in part on the context.
It is understood that the meaning of "on 8230; \8230on," \8230, above "and" on 82308230; \823030, above "in the present disclosure should be interpreted in the broadest manner such that" on 8230; \8230above "means not only" directly on "something" but also on "something with the meaning of intervening features or layers therebetween, and" on 8230; \8230on "or" on 8230, above "not only means" on "or" above "something, but also may include the meaning thereof" on "or" above "something with no intervening features or layers therebetween.
Furthermore, spatially relative terms such as "below 823030; below", "lower", "above", "upper" and the like may be used herein for ease of description to describe one element or feature's relationship to another element or feature or features, as illustrated in the figures. Spatially relative terms are intended to encompass different orientations in use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented and the spatially relative descriptors used herein interpreted accordingly.
The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present invention.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer readable storage medium, such as: ROM/RAM, magnetic disks, optical disks, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (3)
1. A dynamic prediction method for a coal bed gas outburst danger visualization area is characterized by comprising the following steps:
s101, selecting a coal seam of the same mine non-dangerous working face of a coal seam to be tested to perform direct current electrical testing, testing apparent resistivity characteristics of the coal seam, and determining a visual prediction criterion of outburst danger;
the step S101 specifically includes:
selecting a coal seam of the same mine non-dangerous working face of a coal seam to be tested to perform direct current testing, and determining a resistivity distribution interval of the coal seam of the non-dangerous working face;
determining a visual prediction criterion for testing the outburst risk of the coal seam according to the safety of the corresponding resistance value abnormal area, wherein the outburst risk exists in the area exceeding the upper limit and the lower limit of the coal seam resistivity distribution area of the danger-free working face;
s102, drilling and sampling the coal seam to be tested along the tunneling direction, and testing apparent resistivity parameters of each sampling point;
the step S102 specifically includes:
drilling and sampling the coal seam to be tested along the tunneling direction, testing by a direct current method, and obtaining apparent resistivity parameters of each sampling point in an averaging mode;
the sampling should be carried out uniformly along the tunneling direction, so that the sampling area is ensured to cover the area to be tunneled;
s103, establishing a coal bed geoelectricity model, and performing apparent resistivity forward modeling calculation to obtain apparent resistivity distribution of the area to be measured; the area to be detected refers to an area of a coal seam to be tunneled;
the step S103 specifically includes:
establishing a coal bed physical model according to the coal bed thickness and the distribution thereof;
endowing each sampling point apparent resistivity parameter obtained by testing to the coal bed physical model to obtain a coal bed geoelectricity model;
performing forward simulation calculation on the assigned coal bed geoelectric model to obtain apparent resistivity distribution of the area to be measured;
s104, arranging a measuring line at the bottom of the coal seam to be measured in a roadway drawing mode, carrying out multiple direct current electrical method detection on the region to be measured, and carrying out inversion calculation to obtain an apparent resistivity distribution map of the region to be measured;
the step S104 specifically includes:
the area to be detected is an area in front of tunneling and needing to detect outburst danger, and the length of the area to be detected islAnd the measuring line is distributed below the coal seam to be measured, and if the distance between the bottom pumping lane and the coal seam to be measured is equal tohThen measuring the length of the wireLShould satisfyL>l+3h, the electrode distance on the measuring line is 2m, and the number of the arranged electrodes isL/2；
Carrying out direct current method detection on the area to be detected for multiple times, wherein the time interval of each test exceeds 2 hours; averaging the measured data, and performing inversion calculation to obtain an apparent resistivity distribution map of the area to be measured so as to realize visualization of the resistivity distribution of the area to be measured;
s105, determining a low-resistance abnormal area and a high-resistance abnormal area of the area to be detected by combining forward simulation calculation and inversion calculation results, and drawing an image of the outburst risk of the area to be detected according to a visual prediction criterion of the outburst risk;
the step S105 specifically includes:
according to the visual prediction criterion of the outburst danger, a coal seam of the same mine non-dangerous working face of a coal seam to be detected is selected by S101 to be tested through a direct current electrical method to determine the apparent resistivity distribution interval of the coal seam of the non-dangerous working face, and the outburst danger exists in the area where the resistivity of the coal seam of the tested working face exceeds the resistivity distribution interval of the coal seam of the non-dangerous working face;
comparing and subtracting the results of forward simulation calculation and inversion calculation with the visual prediction criterion of the outburst risk to determine a low-resistance abnormal area and a high-resistance abnormal area in the area to be detected; the low-resistance abnormal region comprises a crushing region and a gas-containing region, and the high-resistance abnormal region comprises a stress concentration region;
predicting the outburst risk according to the direct current method test result of the area to be tested;
s106, taking outburst elimination measures of pressure relief or extraction according to the determined low-resistance abnormal area and high-resistance abnormal area;
and S107, dynamically predicting the outburst risk of the coal body after the measures are implemented by a direct current method until the outburst elimination is completed.
2. The method for dynamically predicting the coal bed gas outburst risk visualization area according to claim 1, wherein the step S106 specifically comprises:
and adopting a pressure relief outburst elimination measure for the low-resistance abnormal area, and adopting an extraction outburst elimination measure for the high-resistance abnormal area.
3. The method for dynamically predicting the coal seam gas outburst risk visualization area according to claim 1, wherein the step S107 specifically comprises:
and (4) carrying out direct current method test on the outburst elimination area for 1 time in 1 day, dynamically predicting the outburst elimination condition until the outburst elimination is completed, and continuing excavation to achieve the purpose of visual dynamic prediction.
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