CS206205B1 - Appliance for direct determination of parameters of seismoaccoustic impulses - Google Patents

Description

The invention relates to a device for the direct determination of the parameters of seismo-acoustic pulses, which arise during the loading of rocks in the vicinity of mine workings and characterize the process of their destruction process.

Rocks are exposed to a combination of compressive, tensile and shear stresses around the mine workings. In doing so, the cohesiveness of the cohesive micro-elements is due to this stress. Each of these micro-breaches causes a natural rock impulse in the form of elastic waves that propagate through the rock into the surroundings. The wave image of this pulse carries information about the mechanism of its formation in the form of individual parameters of this pulse.

In both research and operational applications of seismoacoustic measurement for mining operations with existing equipment, only a very limited number of parameters are monitored, at most simultaneously two, such as pulse count and maximum amplitude, eventually relative energy, pulse count and pulse time aggregation, pulse count and predominant frequency. or only dynamic noise intensity. When the stresses in rocks change not only the frequency and amplitude of the rock impulses, or the intensity of the dynamic 206205 | Other parameters of these natural impulses are changing as well as - as it was proved during measurements on rock samples during their loading cycle.

From the results of the seismoacoustic research so far, monitoring of three parameters, ie frequency, maximum amplitude and dynamic noise, has contributed to increasing the safety of miners as an indication of the danger of mine shocks, sudden caving and other sudden violations of mine stability. However, these results also show significant shortcomings. Forecasts often lead to unnecessary dismantling of livestock crews and discontinuation of mining operations, as information on rock disruption from a small number of pulse parameters is inadequate, so the critical limit for dismantling must have a higher safety coefficient. The evaluation of records and some methods is laborious and time consuming.

Comprehensive monitoring of the eight most important parameters of the rock pulses by means of the device according to the invention refines the prognostic data on the risk of shocks, sudden caving, etc., thereby increasing the safety of miners and significantly reducing economic losses.

Many of the existing drawbacks are overcome by September 202020

It also provides a direct determination of the seismoacoustic pulse parameters provided with a seismoacoustic geophone and a processed value register according to the invention, the essence of which is that the seismoacoustic geophone output is coupled to the rock impulse selection signal input connected to the dump start circuit input and evaluation circuit inputs the time interval between the rock pulses, the pulse time evaluation circuit, the maximum amplitude evaluation circuit, the energy coefficient evaluation circuit, the pulse initial phase frequency evaluation circuit, the pulse length evaluation circuit from start to maximum amplitude, the maximum number evaluation circuit in the pulse waveform and the evaluation circuit in the direction of the first deployment, the outputs of said evaluation circuits are connected with their respective inputs of the memory block, the output of the information channel is the output circuit of the output circuit is connected to the start input of the output circuit, the output of which is connected to the input of the processed value register. The output of the processed value register can be linked to the computer input.

An exemplary embodiment of the device according to the invention is shown in the attached drawing, which represents a block diagram of the device.

The output of the seismoacoustic geophone 90 is coupled to the input of the rock impulse selection circuit 100, the output of which is coupled to the input of the dump start circuit 401 and the inputs of the rock interval evaluation circuit 201, the pulse length evaluation circuit 202, the evaluation circuit 203 the maximum amplitude, the energy coefficient evaluation circuit 204, preferably. starter phase night circuit 205, pulse length evaluation circuit 206 from start to maximum amplitude, maximum number evaluation circuit 207 in the waveform

Claims (2)

SUBJECT A device for directly determining seismoacoustic pulse parameters provided with a seismoacoustic geophone and a process value register characterized in that the output of the seismoacoustic geophone (90) is coupled to an input of a rock pulse signal selection circuit (100) whose output is coupled to a circuit input (401) dump start and with inputs of the evaluation interval (201) of the time interval between the rock pulses, evaluation circuit (202) of the pulse time length, maximum amplitude evaluation circuit (203), energy coefficient evaluation circuit (204), pulse start phase frequency evaluation circuit (205) , a pulse length evaluation circuit (206) from the start of the pulse and a first deployment direction evaluation circuit 208. The outputs of the evaluation circuits 201 to 208 are coupled to their respective inputs of the memory block 301, the information channel output of which is connected to the information input of the dump circuit 402, the output of the dump start circuit 401 is connected to the start input of the circuit. 402 of the output whose output is connected to the input of the processed value register 403. Registry output The processed value 403 is coupled to the computer input 404. The seismoacoustic geophone 90 captures the rock pulse and converts it into an electrical signal that it sends to the rock pulse selection circuit 100. Here, the interference signals of the mining operation are removed from the received electrical signal, and the signal corresponding only to the rock impulses is sent to both the dump start circuit 401 and to all evaluation circuits 201 to 20ft. Each of these evaluation circuits 201 (up to 208 in parallel evaluates one of the most important eight rock impulse parameters, ie, the time interval between rock pulses, Pulse Time Length, Maximum Amplitude, Energy Coefficient, Pulse Start Phase Frequency, s length; peak amplitudes, number of peaks in the pulse waveform and the direction of first deployment These parameters characterize the pulse shape and intensity, and their time distribution.The parameters evaluated are stored in the memory block 301. After completion of the homine pulse signal, of the evaluated parameters to a dump circuit 402 from which the information is passed to the processed value register 403. This register may be, for example, a punch, telex, tape, or integrated memory connected to a computer of "in-line" operation. The device according to the invention can be advantageously used especially in mining districts threatened by a sudden failure of their stability, that is to say Shocks, caving, ceiling ruins and the like. RESET to the maximum amplitude of the evaluation circuit du (207) of the number of maxima in the pulse waveform and the first deployment evaluation circuit (208), the outputs of said evaluation circuit (201 to 208) are connected to their respective inputs of a memory block (301) whose information channel output is connected to the information input a dump start circuit (402), the output of the dump start circuit (401) being coupled to the start input of the dump circuit (402) whose output is coupled to the input of the processed value register (403). 2. The apparatus of claim 1, wherein the output of the processed value register (403) is coupled to the input of the computer (404). '