SU1314117A1 - Method of acoustic determining of distance to relief zone border - Google Patents

Abstract

The invention can be used in the development of coal seams that are prone to gazodinamicheskie phenomena, and allows you to increase the safety and efficiency of determining the distance to the boundary of the discharge zone. The method includes conducting mining in the mountain range and drilling holes. With the help of a seismic receiver, which has an acoustic contact with the bottom of the excavation, acoustic signals of elastic oscillations are recorded when drilling holes, their amplitude and frequency are measured. Next, determine the maximum frequency of the acoustic signals of elastic waves. The holes are drilled until a quasi-continuous acoustic signal appears at this frequency. The depth of the hole at which the occurrence of a quasi-continuous acoustic signal is recorded is recorded and taken as the distance to the boundary of the unloading zone. When drilling subsequent holes, only signals of acoustic elastic waves are recorded with a maximum frequency. with s (o

Description

1131

The invention relates to the mining industry and can be used in the development of coal seams that are prone to gas-dynamic phenomena.

The purpose of the invention is to increase the security speed rt of determining the distance to the discharge zone,

The method is carried out as follows. . ,,

, In the ongoing mining. Establish seismic receiver, for example

SED-4 for d-registration of elasticity of their oscillations in the h in the two frequency range

and create a new contact with the bottom of the mine. Then, in the direction of the excavation at a distance of no more than 20 m from the seismic receiver in the coal seam, a hole was drilled with a diameter of 42-43 mm. With the help of a seismic receiver, an amplifier with a linear frequency response in the sound range of the part reg registers the acoustic signal of elastic oscillations, generated during continuous drilling of the hole, which is analyzed by a spectrum analyzer of a parallel analysis method.

Using devices for recording amplitudes (microammeters M4204 can be used) 5 installed at the output of each of the analyzing filters, during the drilling process of the hole, the maximum (critical) frequency is determined at which the composer M.Gag Ulin I.Shulla,

Order 2195/38 Circulation 430 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, g .. Uzhgorod, st. Project, 4

2

The arrival of the signal of their elastic oscillations was registered. The hole is drilled until the appearance of a quasi-continuous signal at the maximum (critical) frequency, and the depth of the hole at which the signal was recorded is recorded. This depth is taken as the distance to the boundary of the discharge zone.

During the drilling of subsequent holes, only signals of acoustic elastic oscillations with the maximum (critical) frequency are recorded.

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five

Claims (1)

Invention Formula The method of acoustic determination of the distance to the boundary of the unloading zone, including conducting mine workings in the mountain massif, drilling holes, recording acoustic signals of elastic vibrations when drilling holes, measures their amplitudes and frequencies, in order to increase safety and efficiency of determining the distance to the boundary of the unloading zone, determine the maximum frequency of the acoustic signals of elastic oscillations, the holes are drilled until the appearance at this frequency of a qua-, continuous-acoustic signal, at ohm fixed depth of the hole on which recorded the occurrence of a quasi-continuous acoustic signal and said depth is 5 for receiving the distance to the zone boundary different T manual ultrasonic inspection, 0