SU1613608A1 - Method of determining the depth of dynamic phenomena focus in rock mass - Google Patents

Abstract

The invention relates to mining. The goal is to improve the accuracy of determining the depth of the center of dynamic phenomena in the array. At the same time, acoustic and electromagnetic emission pulses are recorded only at one point in the array. The time interval between the moments of arrival of pulses of electromagnetic emission and the distance to the source of dynamic phenomena is determined as the product of the time interval between the moments of arrival of pulses of acoustic and electromagnetic emission by the speed of propagation of the acoustic wave in the array. Produce an azimuthal two-component amplitude estimate of the pulses of electromagnetic radiation measured by a two-component system of directional antennas. The ratio between the amplitudes of the pulses determines the direction of the occurrence of the source of dynamic phenomena. 1 il.

Description

The invention relates to mining and is intended to provide a source of dynamic phenomena (sudden coal and gas emissions, rock bursts) in a rock mass and to determine the coordinates of the center of these phenomena. . The purpose of the invention is to improve the accuracy of determining the depth and direction of the source of dynamic in-source. leny in the array.

. The drawing shows a functional diagram of the device that implements this method ...

Priiilp azimuthal two-component pulse amplitude estimation is implemented in the device by a two-component directional system, antennas and post-processing units.

The device contains a two-component system of directional antennas 1, one of which is "X-radial in the line of reception points, the other is Y-tangential, perpendicular to X, and the X-radial antenna is connected in series with amplifier 2 and detector 3 and the Y-tangential antenna is serially connected to the amplifier 4 and the detector 5, the signals from the detectors 3 and 5 are fed to the amplitude-amplitude comparison unit 6, and the parameters of usi05

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2 and 4 and detectors 3 and 5, respectively, are identical, as well as acoustic transducer 7, sequentially connected to amplifier 8 and detector 9, the output of which is connected to the first input of the meter 10 time intervals, the second input of which is connected to the output of the detector 3, the outputs of the amplitude signal comparison units 6 and the 10 time interval meter are connected to the input of the calculating device 11, which is connected to the plotter or the display 12.

The method is described as follows.

For the studied section of the array, the propagation speeds of the acoustic and electromagnetic electromagneto pulses are preliminarily determined. Then, a two-component system of directional antennas 1 and an acoustic transducer 7 are placed near the registration point. directional antennas 1, and at each receiving point the incoming disturbance signal is decomposed into two components: radial - X and tangential - Y. At the same time, The envelope of each component has

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f;

-, fi vci / j, jrictjibJHaH

and jY are the tangential components of the electromagnetic radiation input signal amplified by the corresponding amplifiers 2 and 4 with equal coefficients (} gain amplitudes and detected by detectors 3 and 5 with identical parameters, respectively.,

The detected signals are received in the amplitude-amplitude comparison unit 6, where these signals are divided one upon the other in the established relationship (for example, Y / X). Then the signal at the output of this block will be proportional to the tangent of the angle of the radial approach of the total disturbance signal from the source to the point of reception. This proportionality is preserved at any time, regardless of the shape and energy of the overall signal. The limits of change of the output signal of the comparison unit 6 indicate the dominance of one of the receive components, and the output one

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the signal is the azimuth of the direction of the dynamic phenomena. Simultaneously detected signal is one of the components (for example, X-radial) that enters the input of the meter 10 time intervals, and starts it. At the same time, an acoustic emission pulse, which accompanies an electromagnetic emission pulse in a dynamic area and came with some delay relative to an electromagnetic pulse, is received by an active transducer 7, amplified by an amplifier 8, then detected by a detector 9 and fed to the second input of the meter 10 intervals, stop it. The value of the time interval of the acoustic emission pulse relative to the electromagnetic emission pulse from the meter 10 time intervals arrives at the first input of the metering device 11, to the second input of which a signal is given from the amplitude amplitude comparison unit 6, the equivalent azimuth of the direction to the source of dynamic phenomena . The output signal from the calculating device 11 is fed to the plotter or the display 12.

Claims (1)

Invention Formula e ni with signals proportional to one .TrTZl L Т- ™; Гь „°, ЗЗ“ о „change the„ „„ ™ ,, lie down, Vv upwe. l is radial to the center of the dynamicherJ -mv and, .g, -b. ", -," Determination of dynamic events in the array, based on simultaneous registration of acoustic and electromagnetic emission pulses in the array, 4Q determination of the time interval between the moments of arrival of electromagnetic and acoustic emission pulses and the distance to the center of dynamic phenomena as the product of the time D5 interval between the moments of arrival of acoustic pulses and electromagnetic emission on the speed of propagation of an acoustic wave in an array, characterized in that, with 5Q, the aim of increasing the accuracy of Depths and directions of the foci of dynamic phenomena in the array; re-registration of acoustic and electromagnetic emission pulses is carried out only at one point of the array; azimuthal two-component amplitude assessment of electromagnetic radiation pulses measured using a two-component network is performed five 0 the signal is the azimuth of the direction of the dynamic phenomena. At the same time, the detected signal of one of the components (for example, X-radially) is fed to the input of the meter 10 time intervals, starting it. At the same time, an acoustic emission pulse, accompanying an electromagnetic emission pulse in a dynamic area and arriving with some delay relative to an electromagnetic pulse, is received by an acoustic transducer 7, amplified by amplifier 8, then detected by detector 9 and fed to the second input of a 10 time interval, stopping it . The value of the time delay interval of the acoustic emission pulse relative to the electromagnetic emission pulse from the meter 10 time intervals arrives at the first input of the metering device 11, the second input of which is fed from the amplitude amplitude comparison unit 6 signal, the equivalent azimuth of the direction to the dynamic phenomena. The output signal from the calculating device 11 is given to the plotter or the display 12. Invention Formula e ni 16136086 We have directional antennas and, by correlation, the direction to the bedding between the amplitudes of the pulses of the dynamic phenomena. -