CN103217719B - Method of advanced detection of breaking-loss wing coal seam of coal road based on single offset pair observation system - Google Patents

Abstract

Broken the method for losing wing coal seam based on the inspection of single big gun to the Advance Detection of Coal Roadway of observation system the present invention relates to a kind of, this method include coal road meet head on one shot point of bottom plate location arrangements and earthquake-wave-exciting, determine and disconnected lose the wing coal seam breakpoint diffracted wave wave train, the diffracted wave of the maximum a cycle of amplitude and calculate the main polarization direction of the diffracted wave in the selection diffracted wave wave train , draw by endpoint of geophone station and with geophone station horizontal line angle counterclockwise and be Ray , the peak swing value corresponding time is found out in above-mentioned cycle length diffracted wave , draw using geophone station as the center of circle and with For the camber line of diameter , take out ray With camber line Intersection point is disconnected mistake wing coal seam breakpoint location. This method not only can use the main polarization direction of disconnected mistake wing coal seam breakpoint diffracted wave, two kinds of dynamic characteristic information of amplitude carry out advanced predictions, and detection is accurate, it is easily operated, it has filled up under mine using the disconnected blank for losing wing coal seam method of geophysical method detection, has brought great convenience to mining construction. amp; lt; b/ amp; gt;

Description

Based on the inspection of single big gun the Advance Detection of Coal Roadway of recording geometry broken and lose the method in wing coal seam

Technical field

The present invention relates to a kind of detection method of disconnected mistake wing coal seam, the method in mistake wing coal seam of especially based on single big gun inspection, the Advance Detection of Coal Roadway of recording geometry being broken.

Background technology

In the irregular mine coal roadway tunneling process of ocurrence of coal seam, the invalid tunnel drilling depth that usual existence causes because judging disconnected mistake position, wing coal seam and blindly construction drill, have a strong impact on tunnelling efficiency and safety, wherein particularly outstanding in cloud, expensive, river, Hunan, Jiangxi and area, Henan, method efficiently and effectively of therefore studying is carried out the disconnected position, wing coal seam of losing of forward probe and is just seemed very necessary.The geophysical method carried out in tunnel at present mainly comprises electromagnetic method class, earthquake class and other class geophysical prospecting technologies, mainly adopts earthquake class methods for tectonic structure forward probe; This class methods over-borrowing mirror tunnel earthquake advanced detection technology, as TSP and TRT, but such technology geophone station and shot point are arranged many, are unfavorable for on-the-spot quick construction; Within this context, propose the simple recording geometry of a kind of single geophone station and shot point, and receive seismic signal based on this recording geometry, use seismic signal to carry out the disconnected wing coal seam location determination that loses and seem very urgent.

According to coal seismic prospecting principle, the disconnected mistake wing coal seam breakpoint location staggered because of tomography can produce diffracted wave, due to coal seam and country rock wave impedance difference obvious, the usual amplitude energy of diffracted wave signal is very strong, be easy to identify from kinematics character, therefore the breakpoint diffracted wave signal retrieve disconnected mistake wing coal seam breakpoint location when detecting at the scene, can be utilized; It is pointed out that in refutation process and need to utilize top or floor strata velocity of longitudinal wave v, and this speed utilizes common seismic means just can obtain, and determines breakpoint location just can judge clear disconnected wing coal seam of losing, thus can tunnel safely by guide field.

Summary of the invention

The disconnected problem losing position, wing coal seam cannot be judged in the erratic mine of ocurrence of coal seam to solve, the invention provides a kind of method of mistake wing coal seam of the Advance Detection of Coal Roadway of recording geometry being broken based on single big gun inspection, the method not only can utilize the disconnected mistake main polarization direction of breakpoint diffracted wave, wing coal seam, amplitude two kinds of dynamic characteristic information carry out advanced prediction, and detection accurately, cost is low, be easy to operation, adopt geophysical method to detect the disconnected blank losing wing coal seam method under having filled up mine, bring great convenience to mining construction.

The technical solution adopted for the present invention to solve the technical problems is: to the Advance Detection of Coal Roadway of recording geometry its concrete steps of method losing wing coal seam of breaking should be based on the inspection of single big gun:

(1) coal road is met head on base plate location arrangements shot point, earthquake-wave-exciting, has X, Z two geophone station of component, can obtain seismologic record at the seismograph of roadway layout 20m place, shot point dead astern layout one;

(2) sequencing of base area seismic travel-time, can determine in seismologic record that X, Z component are disconnected and lose the wing coal seam breakpoint diffracted wave wave train;

(3) compare X, diffracted wave that Z component breaks the amplitude lost in the wing coal seam breakpoint diffracted wave wave train, the one-period length selecting amplitude maximum;

(4) the main polarization direction β of calculation procedure (3) Cycle Length diffracted wave (n sampled point * sampling interval) ₁, the step comprised has:

1) n sampled point X component amplitude mean value is calculated:

$\stackrel{\‾}{X}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{X}_i$

2) n sampled point Z component mean value of amplitude is calculated:

$\stackrel{\‾}{Z}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{Z}_i$

3) matrix is built

$\left[\begin{array}{c}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(X_i-\stackrel{\‾}{X})(X_i-\stackrel{\‾}{X})\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(X_i-\stackrel{\‾}{X})(Z_i-\stackrel{\‾}{Z})\\ \underset{i=1}{\overset{n}{\mathrm{\Σ}}}(Z_i-\stackrel{\‾}{Z})(X_i-\stackrel{\‾}{X})\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(Z_i-\stackrel{\‾}{Z})(Z_i-\stackrel{\‾}{Z})\end{array}\right]$

4) the main proper vector (b of matrix is asked ₁, b ₂), draw the clockwise angle β of geophone station horizontal line ₁:

${\mathrm{\β}}_1=\arctan \left|\frac{b_2}{b_1}\right|$

(5) drawing with geophone station is end points, the clockwise angle β of geophone station horizontal line ₁ray L ₁;

(6) from step (3) Cycle Length diffracted wave, determine the time t that peak swing value is corresponding, solve diameter R, R=v × t, in formula, v is top or floor strata velocity of longitudinal wave;

(7) being the center of circle with geophone station, is that diameter draws camber line L with R ₂, then ray L ₁with camber line L ₂intersection point is disconnected mistake wing coal seam breakpoint location, and this position is disconnected mistake position, wing coal seam.

The invention has the beneficial effects as follows, the method not only can utilize the disconnected mistake main polarization direction of breakpoint diffracted wave, wing coal seam, amplitude two kinds of dynamic characteristic information carry out advanced prediction, and detection accurately, cost is low, be easy to operation, adopt geophysical method to detect the disconnected blank losing wing coal seam method under having filled up mine, bring great convenience to mining construction.

Accompanying drawing explanation

Below in conjunction with accompanying drawing and example, the invention will be further described.

Fig. 1 is recording geometry arrangenent diagram of the present invention.

Fig. 2 is X, Z component is disconnected loses wing coal seam breakpoint diffracted wave wave train distribution schematic diagram.

Window schematic diagram when Fig. 3 is the disconnected mistake wing coal seam breakpoint diffracted wave cycle.

Fig. 4 is L ₁ray schematic diagram.

Fig. 5 determines the corresponding time t schematic diagram of diffracted wave wave train peak swing value.

Fig. 6 is L ₁ray and L ₂circular arc crosses schematic diagram.

Embodiment

In the drawings, to the Advance Detection of Coal Roadway of recording geometry its concrete steps of method losing wing coal seam of breaking should be based on the inspection of single big gun:

(1) coal road is met head on base plate location arrangements shot point, and earthquake-wave-exciting, in shot point dead astern, every 20m place layout one has X, Z two geophone station of component, can obtain seismologic record at the seismograph of roadway layout, recording geometry is arranged as being to the right tunneling direction in Fig. 1, figure;

(2) sequencing of base area seismic travel-time, can determine in seismologic record that X, Z component are disconnected and lose the wing coal seam breakpoint diffracted wave wave train, as shown in Figure 2;

(3) compare X, diffracted wave that Z component breaks the amplitude lost in the wing coal seam breakpoint diffracted wave wave train, the one-period length selecting amplitude maximum, as in Fig. 3, choose the seismic waveshape of window during 33.4ms-35.9ms;

(4) the main polarization direction β of calculation procedure (3) Cycle Length diffracted wave (n sampled point * sampling interval) ₁, the step comprised has:

1) n sampled point X component amplitude mean value is calculated:

$\stackrel{\‾}{X}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{X}_i$

2) n sampled point Z component mean value of amplitude is calculated:

$\stackrel{\‾}{Z}=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{Z}_i$

3) matrix is built

$\left[\begin{array}{c}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(X_i-\stackrel{\‾}{X})(X_i-\stackrel{\‾}{X})\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(X_i-\stackrel{\‾}{X})(Z_i-\stackrel{\‾}{Z})\\ \underset{i=1}{\overset{n}{\mathrm{\Σ}}}(Z_i-\stackrel{\‾}{Z})(X_i-\stackrel{\‾}{X})\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(Z_i-\stackrel{\‾}{Z})(Z_i-\stackrel{\‾}{Z})\end{array}\right]$

4) the main proper vector (b of matrix is asked ₁, b ₂), draw the clockwise angle β of geophone station horizontal line ₁:

${\mathrm{\β}}_1=\arctan \left|\frac{b_2}{b_1}\right|$

(5) drawing with geophone station is end points, the clockwise angle β of geophone station horizontal line ₁ray L ₁, as shown in Figure 4;

(6) from step (3) Cycle Length diffracted wave, determine the time t that peak swing value is corresponding, as shown in Figure 5, solve diameter R, R=v × t, in formula, v is top or floor strata velocity of longitudinal wave;

(7) being the center of circle with geophone station, is that diameter draws camber line L with R ₂, as shown in Figure 6, then ray L ₁with camber line L ₂intersection point is disconnected mistake wing coal seam breakpoint location, and this position is disconnected mistake position, wing coal seam.

Claims (2)

1. based on the inspection of single big gun the Advance Detection of Coal Roadway of recording geometry broken and lose the method in wing coal seam, it is characterized in that, the step of the method comprises, coal road is met head on base plate location arrangements shot point, earthquake-wave-exciting, 20m place, shot point dead astern layout one, there is X, Z two geophone station of component, can seismologic record be obtained at the seismograph of roadway layout; The sequencing of base area seismic travel-time, can determine in seismologic record that X, Z component are disconnected and lose the wing coal seam breakpoint diffracted wave wave train; Relatively X, Z component break the diffracted wave of the amplitude lost in the breakpoint diffracted wave wave train of wing coal seam, the one-period length selecting amplitude maximum; Calculate the main polarization direction of this Cycle Length diffracted wave; Drawing with geophone station is end points, the ray L of the clockwise angle of geophone station horizontal line ₁; In above-mentioned Cycle Length diffracted wave, find out the time t that peak swing value is corresponding, solve diameter R, R=v × t, in formula, v is top or floor strata velocity of longitudinal wave; Being the center of circle with geophone station, is that diameter draws camber line L with R ₂, then ray L ₁with camber line L ₂intersection point is disconnected mistake wing coal seam breakpoint location, and this position is disconnected mistake position, wing coal seam.

2. the method in mistake wing coal seam of breaking to the Advance Detection of Coal Roadway of recording geometry based on single big gun inspection according to claim 1, is characterized in that, the main polarization direction β of the diffracted wave of described calculating one-period length ₁the step comprised has, and calculates n sampled point X component amplitude mean value: calculate n sampled point Z component mean value of amplitude: build matrix

$\left[\begin{array}{c}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(X_i-\stackrel{\‾}{X})(X_i-\stackrel{\‾}{X})\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(X_i-\stackrel{\‾}{X})(Z_i-\stackrel{\‾}{Z})\\ \underset{i=1}{\overset{n}{\mathrm{\Σ}}}(Z_i-\stackrel{\‾}{Z})(X_i-\stackrel{\‾}{X})\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(Z_i-\stackrel{\‾}{Z})(Z_i-\stackrel{\‾}{Z})\end{array}\right]$

Ask the main proper vector (b of matrix ₁, b ₂), draw the clockwise angle β of geophone station horizontal line ₁:

${\mathrm{\β}}_1=\arctan \left|\frac{b_2}{b_1}\right|.$