Control over rock massif strain-stress behaviour variation

FIELD: mining.

SUBSTANCE: in compliance with claimed process, several pairs of "amplifier-time selector" circuits are additionally used for received acoustic signal. Said circuits are controlled by generated control signals, their magnitude for further circuits depending upon duration of previous "amplifier-time selector" circuit power surges. Quantity of circuits is selected proceeding from preset SNR defined by analytical relationship. The latter comprises such parameters as useful signal, input noise signal, signal of noise from time selector power surges, amplifier gain factor, time selector circuit rejection factor and quantity of pairs of "amplifier-time selector" circuits.

EFFECT: higher validity of control.

 

The invention relates to Geophysics and can be used in mining industry for research and control of emerging processes of softening of the rock mass, leading to catastrophic manifestations.

Known [1] the way in which is conducted the testing section of the array signals using a series of packets of uniform pulses, estimate the variance components of the signal spectrum and their change in subsequent episodes, judge the change of the stress state in the rock mass as a whole.

The disadvantages include the complexity of implementation and low reliability, because, firstly, by changing the gap between the harmonic values of the amplitudes of the harmonics can not clearly show the changes; secondly, the spectrum of such signals is very complex, and highlight components of the harmonics is not an easy task that does not allow you to control in real time.

Closer is the method [2], which provided the testing section of the array signals using a series of packs of uniform pulses, estimate the kurtosis of each sample component spectra compared signals at different points in time and changes to the judge about the change of the stress-strain state of the array.

The disadvantages include difficult the th implementation and low reliability, since the change of the frequency interval estimate of the kurtosis can be the same, and due to the complexity of such spectra directly adopted broadband signal may be a low signal-to-noise ratio that results in the error control.

The claimed solution is aimed at improving the accuracy of control of the stress-strain state of a rock mass when choosing prognostic characteristics and monitoring.

This objective is achieved in that in the known method, which consists in testing the array of acoustic signals, receiving signals passed a controlled area of the rock mass, in addition to a received acoustic signal using several pairs of schemes amplifier - time selector, connected in series, analyze the emissions front and back edge of the previous time selector, generates a control signal for the subsequent time selector, the duration of which is equal to the difference between the rear front front release front front rear ejection previous scheme temporary selector is generated by the control signal subsequent temporary scheme selector, number of schemes amplifier - time selector selects from the specified signal/noise ratio, the cat is itself determined from the expression:

N=kp0S(ω)dωkpnp0A(ω)dω+i=lpk(p-1)n(p-1)0B(ω)dω

where

S(ω) is a useful signal to be monitored;

A(ω) is the input signal interference;

B(ω) is the signal to interference from emissions scheme temporary selector;

k is the gain of the amplifier;

n is the coefficient of rejectio scheme temporary selector;

p is the number of pairs of circuit amplifier - time selector, connected in series.

The essence of the proposed method consists in the following. At the controlled area of the rock mass sensors that RA is utaut mode sounding (emitting and receiving). As the probing signal select rectangular acoustic pulse with a given duty cycle. The receivers connected to the receiving equipment, take the signal that has undergone controlled section of the rock mass. The received signal in its spectrum will have features that is characteristic changes of parameters of the spectral power density, and this signal can be "noisy" noises from various sources both internal and external. A common practice [3] to use when taking in such situations, the scheme of "time selector, which selects the signal on the time axis, does not bring success, because this scheme generates additional emissions that are a hindrance in the measurements. For more accurate information you need to select the best signal-to-noise ratio. In this case, you can use several schemes "time selector, connected in series. However, all electronic circuits switching output have emissions, i.e. short pulses with a broad spectrum. When you enable successive schemes "time selector" these pulses are partially formed, and their range is increasing in amplitude, which has a detrimental wagging on the reliability of the control.

To improve the reliability of monitoring changes in the stress-deformi the consistent state of the rock mass must be used in the receiving equipment of the cascaded pair circuit amplifier the time selector, and such schemes may be several. The management of each subsequent temporary selector should be chosen based on the analysis of the emissions front and back edge of the previous scheme temporary selector. Namely, produce a control signal for the subsequent time selector, the duration of which is equal to the difference between the rear front front release front front rear ejection previous scheme temporary selector. That is, each subsequent scheme temporary selector is controlled by a pulse whose duration is shorter than the duration of the previous management scheme temporary selector for the duration of the front and rear of emissions in the previous diagram time selector. Each subsequent amplifier amplifies only the last signal without emissions of the previous schemes of temporary selector. The inclusion of pairs of patterns "amplifier - time selector, you must choose on the basis of signal to noise ratio, which is determined from the expression:

N=kp0S(ω)dωkpnp0 A(ω)dω+i=lpk(p-1)n(p-1)0B(ω)dωwhere

S(ω) is a useful signal to be monitored;

A(ω) is the input signal interference;

B(ω) is the signal to interference from emissions scheme temporary selector;

k is the gain of the amplifier;

n is the coefficient of rejectio scheme temporary selector;

p is the number of pairs of circuit amplifier - time selector, connected in series.

When measuring weak acoustic signals, the proposed method gives a significant gain. For example, when the amplitude of the emissions is equal to 30 mV [3], k=10, n=20 and the initial ratio N=1,2, using only two pairs of "power scheme selection", we get N=6,6, and three pairs give N about 60.

Thus, received signals that have passed the proposed processing circuit and having a specified signal-to-noise ratio, selectable using the above formula, distinguish the proposed method, t is how to really increases its reliability. As a result, may be selected more reliable prognostic features for monitoring changes in the stress-strain state of a rock mass.

LITERATURE

1. RF patent №2191411 from 20.10.02, BI No. 29.

2. RF patent №2192657 from 10.11.02, IB No. 31.

3. Inspection No. 9, 1982, p.26.

The method of controlling the stress-strain state of a rock mass, which consists in testing the array of acoustic pulse signals, the signals that have passed the controlled section of the array of rocks, characterized in that it further to a received acoustic signal using several pairs of schemes amplifier - time selector, connected in series, analyze the emissions front and back edge of the previous time selector, generates a control signal for the subsequent time selector, the duration of which is equal to the difference between the rear front front release front front rear ejection previous scheme temporary selector is generated by the control signal subsequent temporary scheme selector, number of circuits, amplifier the time - selector" to choose from a given signal to noise ratio, which is determined from the expression:
N=kpthe 0S(ω)dωkpnp0A(ω)dω+i=lpk(p-1)n(p-1)0B(ω)dω
where
S(ω) is a useful signal to be monitored;
A(ω) is the input signal interference;
B(ω) is the signal to interference from emissions scheme temporary selector;
k is the gain of the amplifier;
n is the coefficient of rejectio scheme temporary selector;
p is the number of pairs of circuit amplifier - time selector.



 

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