SU1717846A1 - Method for evaluation of pressure bump hazard of rock mass peripheral part and efficiency of measures for its control - Google Patents

Abstract

The invention relates to mining and m. used to determine the stress state of the array, predict the impact and outburst of the bone, and combat dynamic and gas-dynamic phenomena. The purpose of the invention is to increase the safety of work by differentiating the stress state of the marginal zones of the formation. Electromagnetic radiation sensors (EMR) at the workout measure the amplitudes of the pulses (AM) of the electromagnetic radiation, choose thresholds for detecting the radiation depending on the maximum and background amplitudes of the pulses of electromagnetic radiation. At selected thresholds, the AI measures stable average values of the EMP activity pulses and critical values of the EMR activity pulses, and when the EMR activity exceeds the critical values of the EMR activity pulses, the area is considered to be hazardous. Then, measures are taken to eliminate the hazard and make an assessment of their effectiveness. With EMP activity pulses lower than their critical values, the zone is considered to be non-hazardous. When estimating outburst emissions, the initial gas emission rate and its critical value are additionally determined, and the zone is considered to be outburst if the EMP pulses are simultaneously more critical and the initial gas emission rate is more critical. 1 hp ff.

Description

The invention relates to mining and can be used to determine the stress state of an array and to predict impact and explosion hazards and to combat dynamic and gas dynamic phenomena.

The purpose of the invention is to increase the safety of work by differentiating the stress state of the marginal zones of the formation.

The method is carried out as follows.

The EMP sensor is located at the intake at the measurement site. The amplitudes of the EMP pulses are measured and the registration thresholds are selected taking into account the maximum amplitudes of the EMP pulses. The magnitude of the registration thresholds is selected from the ratios

d af + zao at- 4,

DG ZAF 4- Ar

where AO is the maximum amplitude of EMP pulses,

Xi

oo 4 o

AF is the amplitude of the background EMR.

On the selected register thresholds, AI and A2 are measured by 30 counts of EMR activity for the duration of each, which, according to the requirements, is sufficient to obtain a stable average value of EMR activity. Calculate the average stable values of the EMP activity at each threshold of Nt and N2. and when they increase the critical values, the area is considered to be hazardous (outburst).

After an anti-mountain strike measure has been taken, the measurement cycle at the thresholds AI and A2 of the EMP activity, Ni and N2, respectively, is carried out again and this measure is considered effective if

Ni М1кРи№2 №.

After carrying out an abatement measure, a measurement cycle of the EMP activity NI and N2, respectively, at the thresholds AI and A2 is carried out, and a parameter characterizing the emission risk q, the initial emission rate, is recorded and considered effective

Claims (2)

Ni NiKP, N2 N2KP and g gkp. where qKp is a critical parameter characterizing the outburst risk characteristic of these mining and geological conditions. Claims 1. A method for evaluating the impact and outburst risks of the edge part of an array and the effectiveness of control measures, including measuring the maximum amplitude and activity of electromagnetic radiation (EMR) at two recording thresholds above the background EMR background. determining the critical magnitude of EMR activity, evaluating the impact hazard of the edge of the reservoir, when determining the reservoir zones with shock hazard, the use of anti-shock measures in these zones and evaluating the effectiveness of these measures for EMR activity, improving the safety of operations by differentiating the stress state of the marginal zones of the reservoir, the EMR detection thresholds are chosen depending on the maximum and background amplitudes of the EMR activity from the ratios 0 AI  AF + ZA0 BUT  Zaf + Ap five 0 five 0 five 0 five A2 h where AI and A2 are the maximum amplitudes of the EMP on the first and second threshold, respectively; AF - background value of the amplitude of the activity of electromagnetic radiation; AO - the maximum amplitude of EMP activity and on these thresholds, steady average values of EMR activity pulses are recorded. and with these values of EMR activity more critical at each threshold, the marginal part of the reservoir is considered to be hazardous, and at steady average values of EMR activity pulses, obtained before and after the execution of anti-shock measures less than critical at each threshold, the edge part of the formation is considered non-hazardous. 2. The method according to claim 1. the fact that, in determining the outbreaks of the formation zones, the initial outgassing rate and its critical value and the reservoir zone are considered outburst if the stable average values of the EMP pulses at each threshold are more critical before or after the application of the blowout measures and at the same time the outgassing rate critical / when the initial gas emission rate is less than the critical and stable average values of EMP activity pulses at each threshold is less than the critical edges hand side of the reservoir considered nevzryvoopesnoy.