CN107392394B - Method for predicting coal and gas outburst risk of dynamic monitoring driving face - Google Patents
Method for predicting coal and gas outburst risk of dynamic monitoring driving face Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 169
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- 230000005641 tunneling Effects 0.000 claims abstract description 28
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Abstract
A dynamic monitoring method for predicting coal and gas outburst risk of a driving face comprises the following steps: (a) determining a mine geological structure stress influence area, a mining stress relief area and a mining stress concentration area; (b) constructing a plurality of pressure measuring drill holes in the coal body in front of the tunneling surface of the monitored roadway through the tunneled roadway; (c) installing an online or offline coal bed gas pressure dynamic monitoring and analyzing system; (d) automatically recording and storing coal bed gas pressure data and a change curve through an online or offline coal bed gas pressure dynamic monitoring and analyzing system; (e) and determining the coal and gas outburst danger in the front of the monitoring roadway according to the coal seam gas pressure data and the change curve and the judgment criterion. According to the invention, the influence of geological structure, mining stress and coal bed gas pressure on coal and gas outburst is comprehensively investigated through dynamically monitoring the distribution rule of the coal bed gas pressure in the coal body in front of the tunneling surface, so that the danger of the coal and gas outburst in tunneling can be more scientifically monitored.
Description
Technical Field
The invention relates to a coal and gas outburst risk prediction method for a driving face based on dynamic monitoring of coal bed pressure.
Background
At present, the method for predicting and verifying coal and gas outburst danger of a coal mine coal roadway driving working face mainly adopts a drilling cutting gas desorption index, a drilling cutting amount, coal seam gas content and coal firmness index method. The method mainly has the following problems: firstly, the prediction and verification means is of a 'spot check' type, and dynamic monitoring is not realized; too many human factors are caused in the prediction and verification process, so that the measurement result has large errors, and the situations of non-prominent high indexes and prominent low indexes occur at times; thirdly, most of the measuring indexes are indirect indexes for predicting the outburst risk of the coal and the gas; fourthly, the problems of short prediction distance and small prediction range exist by adopting the traditional coal and gas outburst risk prediction and verification method; the traditional prediction and verification method needs to measure the drilling on the construction parameters of the tunneling working face, and the effective tunneling working time of the construction parameter holes is reduced, so that the tunneling efficiency is influenced; the development trend of intellectualization, informatization and refinement of coal mine safety equipment cannot be met, and due to the fact that the problems in the prior art exist in the aspects, the problem of inaccuracy exists when the coal and gas outburst of the tunneling working face is predicted, the tunneling efficiency is influenced, and the safety and the economy of coal mine production cannot be guaranteed.
Disclosure of Invention
According to the research results of the applicant aiming at the coal and gas outburst mechanism, the occurrence of high coal bed gas pressure and formation coal is the main cause of coal and gas outburst. According to the previous research results, no matter the coal and gas outburst is caused by vibration blasting or a large-diameter advanced drilling process and hydraulic punching jet holes, the coal body in the outburst area can generate pulsating or gentle compression deformation, then the gas pressure of the coal bed can also generate or sharply or slowly rise, namely the change process of the gas pressure of the coal bed is related to the deformation of the coal bed, the coal bed is compressed, the gas pressure is increased, and vice versa. Therefore, the coal bed gas pressure is always considered as a static index when the coal bed gas pressure is measured, namely the coal bed gas pressure in one area is constant, and the dynamic change process influenced by mining cannot be considered after the measurement is finished. In fact, however, from the perspective of rock mechanics, the intact coal body can only undergo dilatation destruction, and the volume of the coal body increases after the dilatation destruction occurs, in which case the gas pressure of the coal seam can only be reduced, so that the process of the rapid increase of the gas pressure of the coal seam does not occur under the condition. It can be understood that the gas pressure of the coal seam in the area where the tectonic coal exists can only be subjected to a sudden rising change process, because the tectonic coal presents a serious damage structure formed in the past geologic structure movement period, and the tectonic coal which is subjected to capacity expansion damage is formed under the action of the tectonic movement, and the density of the tectonic coal is less than that of an undamaged coal body. And in the later period of excavation and excavation of the roadway, the compressive deformation occurs under the action of ground stress and excavation disturbance. The dynamic change process of the gas pressure of the coal bed can reflect the occurrence condition of the regional tectonic coal. Therefore, the outburst risk of the coal body can be predicted by monitoring the dynamic change process of the coal bed gas pressure.
The invention provides a coal and gas outburst risk prediction method for a driving face based on dynamic monitoring of coal bed pressure.
Compared with the prior art, the technical scheme of the invention has the following advantages:
a coal and gas outburst risk prediction method for a driving face based on dynamic monitoring of coal bed pressure comprises the following steps:
(a) determining a mine geological structure stress influence area, a mining stress relief area and a mining stress concentration area according to geological exploration data and mine mining data;
(b) aiming at a monitored roadway to be tunneled in a geological structure stress influence area, a monitoring roadway is tunneled in advance in a mining stress relief area, and the advance distance is greater than 1.5-2 times of the distance between the advance pressure peak value of the monitored roadway and the tunneling surface of the monitored roadway;
(c) constructing a plurality of pressure measuring drill holes in the coal body in front of the tunneling surface of the monitored roadway in parallel according to a certain spacing distance, wherein the spacing distance is determined according to the actually measured permeability coefficient of the coal bed;
(d) installing an online or offline coal bed gas pressure dynamic monitoring and analyzing system, arranging a gas pressure sensor in the pressure measuring drill hole, connecting the gas pressure sensor with a monitoring substation, debugging the online or offline coal bed gas pressure dynamic monitoring and analyzing system, and starting to monitor and record the coal bed gas pressure value of each pressure measuring drill hole;
(e) automatically recording and storing coal bed gas pressure data and a change curve through an online or offline coal bed gas pressure dynamic monitoring and analyzing system;
(f) and determining the outburst risk of the coal and the gas in front of the monitored roadway according to the coal seam gas pressure data and the change curve and the judgment criterion.
In the method for predicting the coal and gas outburst risk of the driving face based on the dynamic monitoring of the coal bed pressure, the steps of installing an online and offline dynamic monitoring and analyzing system for the coal bed gas pressure comprise:
(a) installing upper computer software for dynamic monitoring and analysis of coal bed gas pressure on a ground system data server;
(b) installing a gas pressure sensor at a preset pressure measuring position of a coal seam pressure measuring drill hole;
(c) connecting a gas pressure sensor to a monitoring substation;
(d) the monitoring substation is connected to the underground ring network of the coal mine through an optical cable;
(e) and (4) accessing the ground system data server to the coal mine underground ring network.
In the method for predicting the coal and gas outburst risk of the tunneling working face based on dynamic monitoring of the coal bed pressure, when the gas pressure value of any one pressure measuring drill hole reaches or exceeds 0.74MPa, the monitoring substation and the upper computer software automatically perform voice alarm, and simultaneously mark the regional monitoring information of the coal bed gas pressure exceeding 0.74MPa, wherein the regional monitoring information comprises the real-time measured value and the maximum value of the coal bed gas pressure, the number of the pressure measuring drill hole and the position information of a monitoring region.
In the method for predicting the coal and gas outburst risk of the tunneling working face based on dynamic monitoring of the coal bed pressure, when the gas pressure value of the coal bed of any pressure measuring drill hole rises, the upper computer software automatically marks the data and the curve of the rising section red to display that the coal and gas outburst risk of the coal body in the pressure measuring drill hole control area rises, and when the gas pressure value of the coal bed of any pressure measuring drill hole falls, the upper computer software automatically marks the data and the curve of the falling section green to display that the coal and gas outburst risk of the coal body in the pressure measuring drill hole control area falls.
According to the method for predicting the coal and gas outburst risk of the tunneling working face based on the dynamic monitoring of the coal bed pressure, a gas pressure sensor is connected with a monitoring substation in a serial connection mode through a communication cable, and gas pressure data collected by the coal bed gas pressure sensor is stored and recorded in the gas pressure monitoring substation.
In the method for predicting the coal and gas outburst risk of the dynamic monitoring excavation working face based on the coal bed pressure, the pressure measuring drill hole is vertical to the excavation direction of the monitored roadway.
Compared with the prior art, the invention has the following technical advantages:
(1) the method for predicting the coal and gas outburst risk of the tunneling working face based on dynamic monitoring of the coal bed pressure adopts the advanced tunneling roadway for monitoring, integrates the relation change of the coal body stress change and the geological structure and mining influence into the monitoring, and predicts the coal and gas outburst risk as a monitoring index, so that the method not only greatly expands the monitoring range of the coal body outburst risk in front of the tunneling working face, but also obviously improves the accuracy of predicting the coal and gas outburst risk.
(2) According to the method for predicting the coal and gas outburst risk of the tunneling working face based on dynamic monitoring of the coal bed pressure, due to the fact that advanced tunneling roadways are adopted for monitoring, and the spacing distance between pressure measuring drill holes is determined according to the actually measured air permeability coefficient of the coal bed when the drill holes are arranged, the method can guarantee the gas pressure monitoring precision, improve the arrangement efficiency and reduce the monitoring cost at the same time.
(3) According to the coal and gas outburst risk prediction method based on dynamic monitoring of the coal bed pressure for the driving face, due to the fact that coal and gas outburst risk monitoring is conducted according to comprehensive factors of geological structures and mining influence of mining areas, coal and gas outburst risk is prevented from fundamental reasons, and therefore the method can accurately determine the coal and gas outburst risk degree in the roadway driving process only according to a single index of the monitored gas pressure without needing to determine multiple indexes like other monitoring methods, and eliminates interference of non-key factors on prevention accuracy to a great extent.
(4) The method for predicting the coal and gas outburst risk of the driving face based on dynamic monitoring of the coal bed pressure accords with the development trend of intellectualization, informatization and refinement of coal mine safety technical equipment.
(5) The method for predicting the coal and gas outburst risk of the tunneling working face based on the dynamic monitoring of the coal bed pressure does not need to construct parameter holes on the tunneling working face of the monitored coal roadway, so that the tunneling efficiency can be improved, and large-scale rapid comprehensive tunneling equipment can be used.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of an implementation of the coal and gas outburst risk prediction method for a tunneling working face based on dynamic monitoring of coal bed pressure;
labeled as: 1-monitoring roadway, 2-monitoring roadway, 3-monitoring substation, 4-gas pressure sensor and 5-pressure measuring drill hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a preferred embodiment of a coal and gas outburst risk prediction method for dynamically monitoring a heading face based on coal bed pressure.
The method for predicting the coal and gas outburst risk of the tunneling working face based on dynamic monitoring of the coal bed pressure comprises the following steps:
(a) determining a mine geological structure stress influence area, a mining stress relief area and a mining stress concentration area according to geological exploration data and mine mining data;
(b) aiming at a monitored roadway 2 planned to be tunneled in a geological structure stress influence area, a monitoring roadway 1 is tunneled in advance in a mining stress relief area, and the advance distance is greater than 1.5-2 times of the distance between the advance pressure peak value of the monitored roadway 2 and the tunneling surface of the monitored roadway 2;
(c) constructing a plurality of pressure measuring drill holes 5 in the coal body in front of the tunneling surface of the monitored tunnel 2 in parallel according to a certain spacing distance, wherein the spacing distance is determined according to the actually measured permeability coefficient of the coal bed;
(d) installing an online or offline coal bed gas pressure dynamic monitoring and analyzing system, arranging a gas pressure sensor 4 in each pressure measuring drill hole 5, connecting the pressure measuring drill holes with a monitoring substation 3, debugging the online or offline coal bed gas pressure dynamic monitoring and analyzing system, and starting to monitor and record the coal bed gas pressure value of each pressure measuring drill hole 5;
(e) automatically recording and storing coal bed gas pressure data and a change curve through an online or offline coal bed gas pressure dynamic monitoring and analyzing system;
(f) and determining the outburst danger of the coal and the gas in the front of the monitoring roadway 1 according to the coal seam gas pressure data and the change curve and the judgment criterion.
In this embodiment, the step of installing the online and offline dynamic monitoring and analyzing system for coal bed gas pressure includes:
(a) installing upper computer software for dynamic monitoring and analysis of coal bed gas pressure on a ground system data server;
(b) installing a gas pressure sensor 4 at a preset pressure measuring position of a coal seam pressure measuring drill hole 5;
(c) connecting a gas pressure sensor 4 to the monitoring substation 3;
(d) the monitoring substation 3 is connected to the underground ring network of the coal mine through an optical cable;
(e) and (4) accessing the ground system data server to the coal mine underground ring network.
In this embodiment, when the gas pressure value of any one pressure measurement drill hole reaches or exceeds 0.74MPa, the monitoring substation 3 and the upper computer software automatically perform voice alarm, and simultaneously mark the regional monitoring information of the coal seam gas pressure exceeding 0.74MPa, including the real-time measured value and the maximum value of the coal seam gas pressure, the number of the pressure measurement drill hole and the position information of the monitoring region.
In this embodiment, when the gas pressure value of the coal seam of any one pressure measuring borehole 5 rises, the upper computer software automatically marks the data and the curve of the rising section red to show that the outburst risk of the coal and the gas of the coal body in the control area of the pressure measuring borehole 5 rises, and when the gas pressure value of the coal seam of any one pressure measuring borehole 5 falls, the upper computer software automatically marks the data and the curve of the falling section green to show that the outburst risk of the coal and the gas of the coal body in the control area of the pressure measuring borehole 5 falls.
In this embodiment, the gas pressure sensor 4 is connected with the monitoring substation 3 in a serial connection manner through a communication cable, and the gas pressure data collected by the coal bed gas pressure sensor 4 is stored and recorded in the gas pressure monitoring substation 3.
In this embodiment, the pressure measuring bore 5 is perpendicular to the heading direction of the roadway being monitored.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (6)
1. A method for dynamically monitoring coal and gas outburst risk of a driving face is characterized by comprising the following steps: the method comprises the following steps:
(a) determining a mine geological structure stress influence area, a mining stress relief area and a mining stress concentration area according to geological exploration data and mine mining data;
(b) aiming at a monitored roadway (2) planned to be tunneled in a geological structure stress influence area, a monitoring roadway (1) is tunneled in advance in a mining stress relief area, and the advance distance is more than 1.5-2 times of the distance between the position of the advance pressure peak of the monitored roadway (2) and the tunneling face head of the monitored roadway (2);
(c) a plurality of pressure measuring drill holes (5) are constructed in a coal body in front of a driving face of the monitored tunnel (2) in parallel according to a certain spacing distance, the spacing distance is determined according to the actually measured permeability coefficient of the coal bed, the pressure measuring drill holes (5) are all drilled along the coal bed, and a pressure measuring air chamber is positioned in the tunnel contour line of the monitored tunnel (2);
(d) installing an online or offline coal bed gas pressure dynamic monitoring and analyzing system, arranging a gas pressure sensor (4) in a pressure measuring drill hole (5), connecting the gas pressure sensor with a monitoring substation (3), debugging the online or offline coal bed gas pressure dynamic monitoring and analyzing system, and starting to monitor and record the coal bed gas pressure value of each pressure measuring drill hole (5);
(e) automatically recording and storing coal bed gas pressure data and a change curve through an online or offline coal bed gas pressure dynamic monitoring and analyzing system;
(f) and determining the coal and gas outburst risk in front of the monitored roadway (2) according to the coal seam gas pressure data and the change curve and the judgment criterion.
2. The method for dynamically monitoring the coal and gas outburst risk of the driving face according to claim 1, wherein the method comprises the following steps: the method for installing the online or offline coal bed gas pressure dynamic monitoring and analyzing system comprises the following steps:
(a) installing upper computer software for dynamic monitoring and analysis of coal bed gas pressure on a ground system data server;
(b) installing a gas pressure sensor (4) at a preset pressure measuring position of a coal seam pressure measuring drill hole (5);
(c) connecting a gas pressure sensor (4) to the monitoring substation (3);
(d) the monitoring substation (3) is connected to the underground ring network of the coal mine through an optical cable;
(e) and (4) accessing the ground system data server to the coal mine underground ring network.
3. The method for dynamically monitoring the coal and gas outburst risk of the driving face according to claim 1 or 2, wherein the method comprises the following steps: when the gas pressure value of any one pressure measuring drill hole reaches or exceeds 0.74MPa, the monitoring substation (3) and the upper computer software automatically perform voice alarm, and simultaneously mark the regional monitoring information of the coal bed gas pressure exceeding 0.74MPa, including the real-time measured value and the maximum value of the coal bed gas pressure, the number of the pressure measuring drill hole and the position information of the monitoring region.
4. The method for dynamically monitoring the coal and gas outburst risk of the driving face according to claim 3, wherein the method comprises the following steps: when the coal bed gas pressure value of any one pressure measuring drill hole (5) rises, the upper computer software automatically marks the data and the curve of the rising section red to display that the coal and gas outburst danger of the coal body in the control area of the pressure measuring drill hole (5) rises, and when the coal bed gas pressure value of any one pressure measuring drill hole (5) falls, the upper computer software automatically marks the data and the curve of the falling section green to display that the coal and gas outburst danger of the coal body in the control area of the pressure measuring drill hole (5) falls.
5. The method for dynamically monitoring the coal and gas outburst risk of the driving face according to claim 1 or 2, wherein the method comprises the following steps: the gas pressure sensor (4) is connected with the monitoring substation (3) in a serial connection mode through a communication cable, and gas pressure data collected by the coal bed gas pressure sensor (4) are stored and recorded in the gas pressure monitoring substation (3).
6. The method for dynamically monitoring the coal and gas outburst risk of the driving face according to claim 5, wherein the method comprises the following steps: and the pressure measuring drill hole (5) is vertical to the tunneling direction of the monitored roadway.
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| CN109441547B (en) * | 2018-12-29 | 2024-03-19 | 煤炭科学技术研究院有限公司 | Real-time monitoring and early warning system and method for coal and gas outburst of mining working face |
| CN110017168B (en) * | 2019-03-25 | 2024-07-02 | 淮北矿业股份有限公司 | Online monitoring device and online monitoring method for gas pressure in lower mining area |
| CN110905402B (en) * | 2019-11-13 | 2021-05-28 | 山东科技大学 | Pressure relief hole construction method based on mining induced stress dynamic monitoring |
| CN111485946A (en) * | 2020-04-17 | 2020-08-04 | 贵州工程应用技术学院 | Coal face gas outburst risk dynamic analysis method |
| CN114841546A (en) * | 2022-04-26 | 2022-08-02 | 天地（常州）自动化股份有限公司 | Intelligent risk control method for coal and gas outburst of excavation working face |
| CN114961696B (en) * | 2022-05-31 | 2024-08-09 | 西安科技大学 | Method for detecting gas parameters in directional long-drilled holes of coal seam |
| CN116187831B (en) * | 2023-01-30 | 2024-04-02 | 山西潞安环保能源开发股份有限公司 | Intelligent management and control system and method for heading machine based on big data |
| CN116882548B (en) * | 2023-06-15 | 2024-05-17 | 中国矿业大学 | Tunneling roadway coal and gas outburst prediction method based on dynamic probability reasoning |
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