CN105807256A - Mine coal rock power disaster multi-seismic-source real-time positioning method - Google Patents

Abstract

The invention discloses a mine coal rock power disaster multi-seismic-source real-time positioning method. The method comprises the steps of: utilizing an orthogonal magnetic stick antenna to receive electromagnetic radiation signals released by augural coal fracturing of a coal rock power disaster; according to the fact that the energy of the received electromagnetic radiation signals is in direct proportion to the square of the cosine of an included angle between the magnetic stick antenna and a seismic source radiation direction, calculating the ratio of the energy of the electromagnetic radiation signals in the horizontal direction to that of the electromagnetic radiation signals in the vertical direction of the orthogonal magnetic stick antenna, and determining the seismic source radiation direction; and utilizing electromagnetic radiation signals of a plurality of monitoring stations, adopting a direction-finding cross positioning method and the data correlation to carry out operation, and determining the real positions of the seismic sources. By adopting the method, the real-time monitoring and positioning of a plurality of seismic sources of the augural coal fracturing of the coal rock power disaster in front of a working surface are realized, the working amount is reduced, the working efficiency is improved, the positioning effect is better, non-contact prediction is really realized, and a reference basis is provided for making a reasonable mine coal rock power disaster prevention and control measure.

Description

A kind of mine coal rock dynamic disaster many focus real-time location method

Technical field

The present invention relates to a kind of mine coal rock dynamic disaster many focus real-time location method, refer to more specifically utilize the ELECTROMAGNETIC RADIATION SIGNATURE that coal rock dynamic disaster omen coal fracturing discharges to realize many focus real-time positioning, be mainly used in coal rock dynamic disaster monitoring and warning.

Background technology

In recent years, along with continuing to increase of the colliery depth of excavation and intensity, coal rock dynamic disaster is more serious.A kind of phenomenon with dynamic effect and disaster consequence that mine coal rock dynamic disaster phenomenon is coal and rock to be occurred in the short time under extraneous stress effect, mainly includes coal and gas prominent, impulsion pressure (shaking also known as bump, rock burst or ore deposit), top board subside.There is due to these dynamic disasters the marked featurees such as sudden, instantaneous shock and considerable damage, usually bring heavy economic losses even casualties.Therefore, the safety in production in colliery is had important directive significance by monitoring and the Control Technology of studying coal rock dynamic disaster.

At present, mine coal rock dynamic disaster Predicting Technique mainly has index prediction method (mensuration, the drilling gas initial velocity method of drilling cuttings etc.), dynamic continuous monitoring method (acoustic emission, electromagnetic radiation, Gas dynamic prediction etc.).Index prediction method exists that workload is big, activity duration length, affect the shortcomings such as coal production progress, accuracy are not high.Mine laneway construction operation can produce a large amount of noise similar to coal petrography destruction signals, and acoustic emission poor anti jamming capability, it is difficult to realizes coal petrography and breaks being accurately positioned of focus.Adhering to gas extremely unstable in coal seam, gas bearing capacity has uncertainty, and Gas dynamic prediction technology can only feasible region property judge, and poor accuracy.For the research of electromagnetic radiation location, realize the qualitative judgement to dynamic disaster region (angle 60 °, the sector region of radius 7m～22m) at present, still cannot complete coal petrography and break the accurate judgement of hypocentral location；In view of propagation velocity of electromagnetic wave is very fast, and coal-face length is relatively short, electromagnetic radiation seismic source energy is unknown number simultaneously, adopt traditional distance and digital substantially cannot realize, in prior art literature, patent " a kind of coal and gas prominent disaster omen coal fracturing seismic source location method ", application number: 201310000729.4, the applying date: 2013.1.5, its method is to adopt electromagnetic radiation location direction of earthquake source, then uses Acoustic Emission location hypocentral distance；Patent " a kind of coal rock dynamic disaster electromagnetic radiation localization method ", application number: 201510473692.6, August 5 2015 application time, the method is according to distance and timi requirement, but 8 powers of electromagnetic wave vacuum medium velocity 3 × 10, only small according to distance and timi requirement time difference, this method is difficulty with substantially.

Summary of the invention

The purpose of the present invention is in order to overcome the weak point of above-mentioned background technology, and provides a kind of mine coal rock dynamic disaster many focus real-time location method, by coal fracturing ELECTROMAGNETIC RADIATION SIGNATURE data analysis, is accurately positioned hypocentral location.

Research shows, can discharge a large amount of electric charge in coal and rock stand under load deformation fracture process, and electric charge does random motion with crack propagation, and then produces coal rock dynamic disaster precursor information ELECTROMAGNETIC RADIATION SIGNATURE.Electromagnetic radiation monitoring technology is a kind of nonimpact printed wastes method, the analysis of the ELECTROMAGNETIC RADIATION SIGNATURE precursor information by the electromagnetic radiation monitoring station putting layout before work surface is received judges, the early warning of mine coal rock dynamic disaster can be realized, provide foundation for formulating corresponding prevention and control measure.

Probability statistics are the methods that research stochastic signal is regular.At dynamic test Data processing often by means of correlation analysis method, being easily separated, predict and select suitable Processing Algorithm etc. to useful signal and interference signal, correlation analysis has become one of signal basic handling means.If two data or stochastic signal present identical undulating manner, illustrate that the dependency of two data or stochastic signal is strong, then change is similar each other, otherwise, differ greatly between the two.Therefore, by correlation analysis method many focus ELECTROMAGNETIC RADIATION SIGNATURE can do the later stage to process, it is determined that the ELECTROMAGNETIC RADIATION SIGNATURE of same focus.

To achieve these goals, the technical scheme is that such: adopt orthogonal magnetic rod antenna to receive the ELECTROMAGNETIC RADIATION SIGNATURE that coal rock dynamic disaster omen coal fracturing discharges, according to square being directly proportional of the ELECTROMAGNETIC RADIATION SIGNATURE energy and the magnetic rod antenna that receive and focus radiation direction included angle cosine, calculate orthogonal magnetic rod antenna horizontal direction and vertical direction ELECTROMAGNETIC RADIATION SIGNATURE energy ratio, determine focus radiation direction, utilize multiple monitoring stations ELECTROMAGNETIC RADIATION SIGNATURE, adopt direction cross positioning method and data correlation operation, it is determined that focus actual position.

Further, multiple monitoring stations can receive electromagnetic emission as coal rock bursting signal simultaneously, adopts direction cross positioning method, and the intersection point of different focus radiation directions is the possible position (there is false bearing point) of focus.

Further, being processed by each monitoring station ELECTROMAGNETIC RADIATION SIGNATURE correlation data, get rid of false bearing point, the intersection point of two radiation directions of correlation maximum is the actual position of focus.

Yet further, it is achieved focus actual position is determined, any two monitoring station ELECTROMAGNETIC RADIATION SIGNATURE can be made correlation data and process, namely assume that, in coal rock dynamic disaster arriving process, the ELECTROMAGNETIC RADIATION SIGNATURE that each monitoring station receives is S_A1(t)、S_A2(t)…、S_B1(t)、S_B2(t) ..., then any two ELECTROMAGNETIC RADIATION SIGNATURE is done correlation data computing, and seeks the mould ρ (X, Y) of its correlation coefficient, thus obtaining a correlation matrix Q:

$Q=\left[\begin{array}{ccc}{\mathrm{\ρ}}_{A_1{A}_2}& {\mathrm{\ρ}}_{A_1{B}_1}& {\mathrm{\ρ}}_{A_1{B}_2}\\ {\mathrm{\ρ}}_{A_2{A}_1}& {\mathrm{\ρ}}_{A_2{B}_1}& {\mathrm{\ρ}}_{A_2{B}_2}\\ {\mathrm{\ρ}}_{B_1{A}_1}& {\mathrm{\ρ}}_{B_1{A}_2}& {\mathrm{\ρ}}_{B_1{B}_2}\\ {\mathrm{\ρ}}_{B_2{A}_1}& {\mathrm{\ρ}}_{B_2{A}_2}& {\mathrm{\ρ}}_{B_2{B}_1}\end{array}\right]$

In formula, correlation coefficient

$\mathrm{\ρ}(X,Y)=\frac{Cov(X,Y)}{\sqrt{D\left(X\right)}\sqrt{D\left(Y\right)}}$

Covariance

Cov (X, Y)=E [(X-EX) (Y-EY)]

In formula, E is the electromotive force intensity received

Theoretical according to correlation analysis, correlation coefficient is more big, illustrates that the similarity of two signals is more strong, and the intersection point in two electromagnetic radiation directions that the subscript of the correlation coefficient maximum in correlation matrix each row is corresponding is focus actual position.

The invention has the beneficial effects as follows: what can realize the work surface front coal rock dynamic disaster many focus of omen coal fracturing monitors location in real time, reduce workload, improve work efficiency, locating effect is better, it is truly realized nonimpact printed wastes, provides reference frame for formulating rational coal rock dynamic disaster prevention and control measure.

Accompanying drawing explanation

Fig. 1 focus real-time positioning system schematic diagram of the present invention.

Fig. 2 focus radiation direction of the present invention determines schematic diagram.

Detailed description of the invention

Describe the invention process situation in detail below in conjunction with accompanying drawing, but they are not intended that limitation of the invention, only for example, simultaneously by illustrating that advantages of the present invention will become clearer from easy to understand.

A kind of mine coal rock dynamic disaster many focus real-time location method, first, orthogonal magnetic rod antenna is adopted to receive the ELECTROMAGNETIC RADIATION SIGNATURE that coal rock dynamic disaster omen coal fracturing discharges, according to square being directly proportional of the ELECTROMAGNETIC RADIATION SIGNATURE energy and the magnetic rod antenna that receive and focus radiation direction included angle cosine, calculate orthogonal magnetic rod antenna horizontal direction and vertical direction ELECTROMAGNETIC RADIATION SIGNATURE energy ratio, it is determined that focus radiation direction.

As shown in Figure 1, multiple monitoring stations (A1, B1, A2, B2 ...) are arranged in mine working face front, the ELECTROMAGNETIC RADIATION SIGNATURE that work surface front coal fracturing is discharged is monitored in real time, and the ELECTROMAGNETIC RADIATION SIGNATURE that each monitoring station receives is transferred to ground-based computer and controls system.In coal rock dynamic disaster arriving process, work surface front coal fracturing aggravates gradually, and the ELECTROMAGNETIC RADIATION SIGNATURE of release sharply strengthens, and the monitoring station that distance dynamic disaster occurs position nearer can real-time monitor this change procedure.ELECTROMAGNETIC RADIATION SIGNATURE data are made following analysis by computer control system:

According to Faraday law of electromagnetic induction, following relational expression can be obtained:

$E=NScos\mathrm{\θ}\frac{dB}{dt}---\left(1\right)$

$P=\frac{E^2}{R}---\left(2\right)$

$W={\∫}_{t_1}^{t_2}Pdt---\left(3\right)$

In formula, N is the number of turn of magnetic rod antenna receiving coil；S is the area of magnetic rod antenna receiving coil；θ is antenna direction and focus electromagnetic radiation angular separation；For magnetic field intensity interconversion rate；R is the internal driving of magnetic rod antenna；P is the electromagnetic radiance that magnetic rod antenna receives；E is the electromotive force intensity received；W is the electromagnetic radiation energy received.

According to (1), (2), (3) it can be seen that electromagnetic radiation energy W exists relation as shown in formula (4) with angle theta:

W∝cos²θ(4)

Assume that focus emittance is W₀, the electromagnetic radiation energy that magnetic rod antenna horizontal direction receives is W₁, corresponding angle is θ₁, the electromagnetic radiation energy that vertical direction receives is W₂, corresponding angle is θ₂.The relational expression between electromagnetic radiation energy and the angle received can be obtained as shown in (5) according to (4) formula:

$\frac{W_1}{W_2}=\frac{W_0{\cos }^2{\mathrm{\θ}}_1}{W_0{\cos }^2{\mathrm{\θ}}_2}---\left(5\right)$

Magnetic rod antenna is omnidirectional distribution, then antenna receives angle theta₁And θ₂Between there is relational expression as shown in (6):

${\mathrm{\θ}}_1+{\mathrm{\θ}}_2=\frac{\mathrm{\π}}{2}---\left(6\right)$

Following relational expression can be solved according to formula (5), (6):

${\mathrm{\θ}}_1=\arctan \sqrt{W_2/W_1}---\left(7\right)$

${\mathrm{\θ}}_2=\arctan \sqrt{W_1/W_2}---\left(8\right)$

Namely can determine that coal petrography breaks focus electromagnetic radiation direction according to formula (7), (8), as shown in Figure 2.

Again, for determining focus actual position, utilize multiple monitoring stations ELECTROMAGNETIC RADIATION SIGNATURE, adopt direction cross positioning method and data correlation operation.

As shown in Figure 1, according to the ELECTROMAGNETIC RADIATION SIGNATURE that each monitoring station receives, different electromagnetic radiation directions, monitoring station are directed in coal-face hypocentral location, adopting direction cross positioning method, the intersection point in difference electromagnetic radiation direction, each monitoring station is the possible position of focus (point 1, point 2, point 3, point 4).In coal rock dynamic disaster generating process, it is possible to can there is multiple focus, then direction cross positioning method is adopted to there will be false bearing point (point 2, point 3).

Any two monitoring station ELECTROMAGNETIC RADIATION SIGNATURE is made correlation data process, get rid of false bearing point, it is achieved focus actual position is determined.Assume that, in coal rock dynamic disaster arriving process, the ELECTROMAGNETIC RADIATION SIGNATURE that each monitoring station receives is S_A1(t)、S_A2(t)…、S_B1(t)、S_B2(t) ..., then any two ELECTROMAGNETIC RADIATION SIGNATURE is done correlation data computing, and seeks the mould ρ (X, Y) of its correlation coefficient, thus obtaining shown in a correlation matrix Q such as formula (9):

$Q=\left[\begin{array}{ccc}{\mathrm{\ρ}}_{A_1{A}_2}& {\mathrm{\ρ}}_{A_1{B}_1}& {\mathrm{\ρ}}_{A_1{B}_2}\\ {\mathrm{\ρ}}_{A_2{A}_1}& {\mathrm{\ρ}}_{A_2{B}_1}& {\mathrm{\ρ}}_{A_2{B}_2}\\ {\mathrm{\ρ}}_{B_1{A}_1}& {\mathrm{\ρ}}_{B_1{A}_2}& {\mathrm{\ρ}}_{B_1{B}_2}\\ {\mathrm{\ρ}}_{B_2{A}_1}& {\mathrm{\ρ}}_{B_2{A}_2}& {\mathrm{\ρ}}_{B_2{B}_1}\end{array}\right]---\left(9\right)$

In formula, correlation coefficient

$\mathrm{\ρ}(X,Y)=\frac{Cov(X,Y)}{\sqrt{D\left(X\right)}\sqrt{D\left(Y\right)}}---\left(10\right)$

Covariance

Cov (X, Y)=E [(X-EX) (Y-EY)] (11)

Theoretical according to correlation analysis, correlation coefficient is more big, illustrates that the similarity of two signals is more strong.What signal correlation was the strongest is exactly signal itself, so the intersection point in two electromagnetic radiation directions corresponding to the subscript of correlation coefficient maximum in correlation matrix each row is focus actual position, the intersection point of these two radiation direction lines and other radiation direction lines is false bearing point, eliminate false bearing point, it is achieved that many focus actual position is accurately positioned.

Concrete, use this mine coal rock dynamic disaster many focus real-time location method, calculate process as follows:

As it is shown in figure 1, multiple electromagnetic radiation monitoring station is arranged in work surface front at a certain distance.Assume in coal rock dynamic disaster arriving process, the ELECTROMAGNETIC RADIATION SIGNATURE that monitoring station A1, A2, B1, B2 receive respectively S_A1(t)、S_A2(t)、S_B1(t)、S_B2T (), then can calculate respectively obtain respective electromagnetic radiation direction according to formula (7), (8).By the correlation analysis computing of any two ELECTROMAGNETIC RADIATION SIGNATURE, obtain shown in correlation matrix Q such as formula (9).If correlation coefficientAndThen S_A1(t) and S_A2T () is the ELECTROMAGNETIC RADIATION SIGNATURE of same focus, the intersection point (in work surface location point 1) in two electromagnetic radiation directions is focus actual position, S_A1(t) and S_B1T the intersection point (in work surface location point 3) in () electromagnetic radiation direction is false bearing point, S_A1(t) and S_B2T () electromagnetic radiation direction without intersection point, finally eliminates false bearing point 3 in work surface, it is determined that electromagnetic radiation focus actual position point 1.If correlation coefficientAndThen S_B2(t) and S_B1T () is same focus ELECTROMAGNETIC RADIATION SIGNATURE, the intersection point (in work surface location point 4) in two electromagnetic radiation directions is focus actual position, S_B2(t) and S_A1(t) electromagnetic radiation direction in work surface without intersection point, S_B2(t) and S_A2T intersection point (in work surface location point 2) the position false bearing point in () electromagnetic radiation direction, finally eliminates false bearing point 2, it is determined that true anchor point 4.

Therefore, in coal rock dynamic disaster generating process, the mine coal rock dynamic disaster many focus real-time location method using the present invention can complete being accurately positioned in real time of many focus, it is achieved the Monitoring and forecasting system in real-time of coal rock dynamic disaster, provides foundation for formulating corresponding prevention and control measure.

Unspecified it is prior art.

Claims (4)

1. mine coal rock dynamic disaster many focus real-time location method, it is characterized in that: adopt orthogonal magnetic rod antenna to receive the ELECTROMAGNETIC RADIATION SIGNATURE that coal rock dynamic disaster omen coal fracturing discharges, according to square being directly proportional of the ELECTROMAGNETIC RADIATION SIGNATURE energy and the magnetic rod antenna that receive and focus radiation direction included angle cosine, calculate orthogonal magnetic rod antenna horizontal direction and vertical direction ELECTROMAGNETIC RADIATION SIGNATURE energy ratio, determine focus radiation direction, utilize multiple monitoring stations ELECTROMAGNETIC RADIATION SIGNATURE, adopt direction cross positioning method and data correlation operation, it is determined that focus actual position.

2. mine coal rock dynamic disaster many focus real-time location method according to claim 1, it is characterized in that: multiple monitoring stations can receive electromagnetic emission as coal rock bursting signal simultaneously, adopting direction cross positioning method, the intersection point of different focus radiation directions is the possible position of focus.

3. mine coal rock dynamic disaster many focus real-time location method according to claim 1 and 2, it is characterized in that: processed by each monitoring station ELECTROMAGNETIC RADIATION SIGNATURE correlation data, getting rid of false bearing point, the intersection point of two radiation directions of correlation maximum is the actual position of focus.

4. mine coal rock dynamic disaster many focus real-time location method according to claim 3, it is characterized in that: realize focus actual position and determine, any two monitoring station ELECTROMAGNETIC RADIATION SIGNATURE can be made correlation data process, namely assume that, in coal rock dynamic disaster arriving process, the ELECTROMAGNETIC RADIATION SIGNATURE that each monitoring station receives is S_A1(t)、S_A2(t)…、S_B1(t)、S_B2(t) ..., then any two ELECTROMAGNETIC RADIATION SIGNATURE is done correlation data computing, and seeks the mould ρ (X, Y) of its correlation coefficient, thus obtaining a correlation matrix Q:

$Q=\left[\begin{array}{ccc}{\mathrm{\ρ}}_{A_1{A}_2}& {\mathrm{\ρ}}_{A_1{B}_1}& {\mathrm{\ρ}}_{A_1{B}_2}\\ {\mathrm{\ρ}}_{A_2{A}_1}& {\mathrm{\ρ}}_{A_2{B}_1}& {\mathrm{\ρ}}_{A_2{B}_2}\\ {\mathrm{\ρ}}_{B_1{A}_1}& {\mathrm{\ρ}}_{B_1{A}_2}& {\mathrm{\ρ}}_{B_1{B}_2}\\ {\mathrm{\ρ}}_{B_2{A}_1}& {\mathrm{\ρ}}_{B_2{A}_2}& {\mathrm{\ρ}}_{B_2{B}_1}\end{array}\right]$

In formula, correlation coefficient

$\mathrm{\ρ}(X,Y)=\frac{Cov(X,Y)}{\sqrt{D\left(X\right)}\sqrt{D\left(Y\right)}}$

Covariance

Cov (X, Y)=E [(X-EX) (Y-EY)]

In formula, E is the electromotive force intensity received

Theoretical according to correlation analysis, correlation coefficient is more big, illustrates that the similarity of two signals is more strong, and the intersection point in two electromagnetic radiation directions that the subscript of the correlation coefficient maximum in correlation matrix each row is corresponding is focus actual position.