SU1627695A1 - Device for monitoring stressed state of rock mass - Google Patents

Abstract

The invention relates to mining and allows for increased reliable monitoring of the stress state of the rock mass. The device consists of at least three identical acoustic channels 1, the outputs of which are connected to measurement units 7, channel 14 for detecting electromagnetic emission (EME). driver 12 and master 13 intervals Each channel 1 consists of a series 2 sensor 2, amplifier 3, control key (CC) 4, ADC 5 and ee. ehiopa Glok 7 measuring eoiio u in successively i comprehended ty66.io cusio 1eni 8, memory 9 and peinci of radio 10 The subunit 8 is connected with control block 11 Channel 14 is connected and (serially connected antennas 15. receive per unit 1G and b yuki 17 EME detection The output b yuka 17 to i is connected to one w of the inputs of frms. permitting HI control inputs NK 4 sshnaly i output lei 3 passes t MI input 1Y CPU 5, i ic has converted J1 s to if | yuyu (ropm., i i.iicM arrive at the inputs of the selector cccch produce gsch digital processing and v; dem., | spher and i time on the signal useful sipyyuv, e vmvan nych acoustic mission in block 7. i c are recorded II.S.T./K.P for synchronization of ycrpcjHciBci Pa p (chi | tsi intrnal to the criminal code 4 nociynaei from the output of SUR-detrusion. 12 from the output of the eche detection unit 17 I: and Nmius 11, the IMPU of the resolution onpi im et sensor 13 1 or U5 (L S5 J O5 co

Description

The invention is fire retardant and can be used to monitor the state of the rock mass, mince the coordinates of rock blows and foci of increased seismoacoustic emission.

The purpose of the invention is to increase the reliability of monitoring the stress state of the rock mass.

The drawing shows a block diagram illustrating the operation of the device.

The device contains p-acoustically. X Cain, SE 1 (). each of which consists of a serially connected sensor 2, an amplifier 3, a key 4, an analog-digital converter (ADC) 5 and a selector 6, the output of which is connected to the corresponding channel number by the input of the measuring unit 7. consisting in turn of the serially connected calculation subunits 8, memory 9 and registration 10, as well as a sub-control (synchronization) unit 11, the output of which is connected to the control inputs of the ADC 5. selector 6, calculation subblocks 8, memory 9 and the second (synchronizing) input of the time interval generator 12, the third (specifying) input of which is connected to the output of the time interval setting unit 13, the first (specifying) input of the time interval former 12 is connected to the output of the electromagnetic emission signal detection channel (CBS EME) 14. which consists of serially connected antennas 15. reception - the amplifying unit 16 and the detection unit EME 17, and the output of the time interval generator 12 is connected in parallel with the control (second) inputs of the keys 4.

The device works as follows.

In acoustic channels 1 of sensor 2, acoustic signals arising during cracking in rocks are received, as well as signals of acoustic interference caused by the operation of technological equipment are converted into electrical signals that are amplified by amplifiers 3 and received at the inputs of keys 4, which are the original state is closed

The signals (pulses) of electromagnetic emission (EME), also occurring during cracking in rocks, are received by an antenna (EME sensor) 15 of the channel for detecting EME signals 14 and, after amplification in a sub-amplified unit 16, are fed to the input of an EME signal detection unit 17. Block detection signals EME 17 when entering at its input signals corresponding to certain predetermined criteria (intensity, intensity of the electromagnetic field), issues a start command to the input of the time generator

four

12. After that, the shaper of time intervals 12 generates and sends the permission command to the control inputs of the keys 4 using the time interval setting unit 13. Moreover, the delay time TI from the moment of detection of the EME signal to the beginning of the resolution command and the duration of the resolution command pulse ( ".)

are determined by the dependence of acoustic oscillations d in a mr rock mass of the controlled zone Ј.

on speed of controllable sizes

and

d g

Lt 7

H

the distance from the center of the sensors installed by the group method to the beginning of the monitored zone (minimum radius); distance from the sensors to the end of the monitored zone (maximum radius).

Then

25

&

Ti. Tu,

t ".

0

five

0

five

0

five

If there is a resolution command on the control inputs of the keys 4, the signals from the output of the amplifiers 3 are passed to the inputs of the ATSP5, where they are converted into digital form and then fed to the inputs of the selectors 6. In the selectors 6, digital processing and extraction are performed. signal caused by interference and acoustic emission of rocks, useful signals, i.e., caused by acoustic emission. Subsequently, the signals in digital form are fed to the corresponding inputs of the 8-coordinate subunit of the calculation unit, and then the received information is output to the recording subunit 10 through the memory 9 subunit. The control subunit is used to control (synchronize) the device, for which its output is connected to the control inputs of the ADC selectors 6, computing subblocks 8, memory 9, and timers 12.

Claims (1)

Invention Formula A device for monitoring the stress state of an array of rocks, containing at least three identical acoustic channels, each of which consists of a series-connected sensor, amplifier, analog-digital converter, selector, the output of which is connected to one of the inputs of the measurement unit and sequentially connected sublocks of computation, memory, registration, and a subunit of control, the output of which is connected to one of the inputs of the subunit of the computation and the subunit of memory. characterized in that, in order to increase the reliability of monitoring the stress state of the rock mass, a time interval generator, a time interval generator, an electromagnetic emission detection channel including an antenna connected in series, an antenna gain receiver and an electromagnetic emission detection unit, are introduced Each acoustic channel in series between the amplifier input and the analog-digital converter input is additionally introduced control keys, the inputs of which are connected in parallel to the input of the time interval shaper, the first input of which is connected to the output of the electromagnetic emission signal detection channel, and the second time interval shaper input is connected to the output the subblock control, and the third input with the output of the time interval master.