SU1208522A1 - Method of determining parameters of seismic wave propagation in massive rock and arrangement for accomplishment of same - Google Patents

Abstract

1. A method for determining seismic wave propagation parameters in an array of rocks, including the excitation of seismic waves and multichannel measurement of the speed of their propagation by a group of seismic receivers, characterized in that, in order to increase the informativity of the method by measuring the direction of propagation of seismic waves in a geographic coordinate system, one from the seismic receivers, the seismic waves are set at the excitation point, while others are placed around the circumference with a fixed angle In this case, the radius connecting the point of excitation with the installation location of the first channel seismic receiver is aligned with the ce-. the correct direction of the meridian, measure the speed of propagation of seismic waves on all channels and determine the angle between the direction of their propagation and the direction to the north. i (L U-JJ

Description

2. A device for determining the propagation parameters: seismic waves in the rock mass: rocks, including, n parallel channels, each of which is connected in series with a seismic sensor, frequency filter, amplifier, amplitude noise filter with display and tuning unit, threshold cascade, reference driver pulse, while all channels, except the first, contain an end stage connected to the transducer time, intervals in the code, and the device includes a generator of counting pulses connected to the input ladder endpoints: cascades, and a shock unit, characterized in that, in order to increase the information content of the device, by calculating the direction of propagation of seismic waves in a geographic coordinate system, a digital code converter is inserted into the device into the corner to which the time converter converters are connected to a code , and in each channel, except for the first, triggers are inserted between the reference pulse formers and terminal cascades, while the second trigger inputs are connected to the outputs of the driver pulses of the first channel,

3, the apparatus according to claim 2, characterized in that the digital code-to-angle converter contains five square squaring schemes, three multipliers, a multiplier-constant multiplier circuit, three inverters, three adders, a dividing circuit, and the first addition circuit connected in series with constant term bfbiM, kbrn extraction scheme, second addition scheme with constant term, dividing scheme into a constant number, second correlation scheme, inverse trigonometric function calculation and digital indi-invention relates to the control of phi the zico-mechanical properties of rocks are measured by a measurer, with the input of the first three squaring schemes connected to the outputs of time slot converters into a digital code, the output of the first squaring circuit connected to the first input of the first multiplier and the second input of the third multiplier, the output of the second raising circuit to the square is connected to the second input of the first: multiplier and the first input of the second multiplier, and the output of the third squaring circuit is connected to the second input of the second multiplier and the first input of the third mind through the multiplication circuit with a constant multiplier is connected to the first input of the first adder, the second input of which through an inverter is connected to the output of the second intelligent, connected also to the first input of the second adder, the second input of which through the second inverter is connected to the output of the third the multiplier, wherein the inverter is also connected to the third input of the first adder, the output of which through the fourth squaring circuit is connected to the first input of the third adder and the division circuit, the output of the second The fifth adder via the fifth squaring circuit is connected to the second input of the third adder, the output connected to the second input of the dividing circuit, the output connected to the input of the third inverter connected to the input of the addition circuit with a constant p. to which the dividing circuit is connected in series for a constant number, a root extraction scheme, a second addition scheme with a constant term, a division by a constant number, a second extraction scheme for a root, a scheme for calculating an inverse trigonomer; The digital indicator

nor the features of seismic wave propagation in the mountain massif.

The aim of the invention is to increase the information content of the method and device by measuring the direction of propagation of seismic waves in a geographic coordinate system.

FIG. 1 is a diagram of the device according to FIG. 2 is a diagram of the converter of the velocity of propagation of seismic waves into an angle characterizing the main direction of propagation of seismic waves.

The device contains q parallel channels (and - 4), each of which consists of series-connected seismic sensors 1 (see Fig. &Apos; 1), frequency filter 2, amplifier 3 in limiting mode, filter 4 for amplitude interference from block 5 for indication of interference in the channel and amplitude noise filter settings

threshold stage 6, the driver 7 reference pulse. One of the seismic sensors is located at the point of excitation of seismic waves, and the others are located at points located on a circle with an angle of 30-60 ° between them. A sensor located on a radius aligned with the north direction of the meridian is taken as the side of the angle characterizing the main direction of propagation of elastic waves in the mountain massif, i.e. the angle formed by the major axis of the ellipse (the shape of the seismic wave propagation front) and the north direction meridian.

Each channel, with the exception of the first, additionally contains a series-connected trigger 8, terminal cascade 9 (AND circuit) and a converter 10 time slots in the code. The first inputs of the trigger 8 are connected to the output of the driver 8 of the reference pulse of the first channel, and the second inputs are connected to the outputs of the drivers of their 7 channels. The second inputs of the end stages of all channels are connected to the generator output of 11 counting pulses. The outputs of the converters 10 are connected to the inputs of the digital converter 12 of the code into the angle, which characterizes the main direction of propagation of seismic waves in the rock mass. The converter is connected to the display unit 13.

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Converter 12 contains five squaring circuits 14-18, three multipliers 19-21, a multiplier 22 constant multiplier, three inverters 23-25, three adders 26-28, a dividing circuit 29 and connected in series to the first circuit 30 of a constant term, a root extraction circuit 31, a second circuit 32. a constant term, a constant division circuit 33, a second root extraction circuit 34, a calculation circuit 35 of the inverse trigonometric function, the inputs of the first three schemes 14, 15 and 16 squared connected to transform outputs 10 time intervals into the code, the output of the first squaring circuit 14 is connected to the first input of the first multiplier 19 and the second input of the third multiplier 21, the output of the second squaring circuit 15 is connected to the second input of the first multiplier 19 and the first input of the second multiplier 20, and the output of the third circuit 16 is connected to the square with the second input of the second multiplier 20 and the first input of the third multiplier 21, the output of the first multiplier 19 through the multiplication circuit 22 with a constant multiplier is connected with the first input of the first adder 26, the second The first input is through an inverter 23 connected to the output of the second multiplier 20, also connected to the first input of the second adder 27, the second input of which through the second inverter 24 is connected to the output of the third multiplier 21, while the inverter 24 is connected to the third input of the first adder 26, whose output through the fourth squaring circuit 17 is connected to the first inputs of the third adder 28 and dividing circuit 29, the output of the second adder 27 is connected through the fifth squaring circuit 18 to the second input of the third adder 28, the output is connected I th to the second input dividing circuit 29, the output connected to the input of the third invertrra 25 connected to the input of combining circuit 30.

The proposed method is implemented as follows.

The launch of elastic oscillations is carried out by a pulsed source of elastic waves - a shock unit (not

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shown) located in a mountain range. Seismic sensors 1 convert rock oscillations into electrical signals that pass through frequency filter 2 interference and are amplified by amplifier 3. To increase the steepness of the front of the first oscillation and reduce the effect of this front on the accuracy of the indication, amplifier 3 operates at amplitude limitation .

The signal from the output of the amplifier 3 is fed to the amplitude noise filter 4 tuned in such a way that no interference signals, similar in frequency to the useful signal, but less in amplitude, pass through. Then, the useful signal is fed to the block 5 of the indication of interference and filter settings 4 and to the threshold cascade 6, which makes a square pulse at the moment of arrival of the useful signal. The reference pulse shaper 7 outputs short triangular pulses to the inputs of the flip-flops 8 along the leading edge of the rectangular pulse of the threshold cascade 6. When the reference pulse arrives from the shaper 7 of the first channel, the first triggers of the flip-flops 8 turn over. At the moment the signals from the formers 7 of their channel arrive at the second inputs of the trigger 8, the latter return to the initial state and at their outputs appear pulses whose duration is equal to the time of propagation of the elastic wave from the point of excitation of the seismic wave to the sensor of the corresponding channel, i.e. the time interval between the first and ti th pulses.

Square pulses from the trigger outputs go to one of the inputs of terminal cascade 9, to the second input of which triangular pulses are received from the generator 11 counting pulses. Thus, the number of pulses at the output of each terminal cascade 9 is proportional to the corresponding pulse duration from the trigger output 8. The converter 10 time intervals into a code converts the number of pulses of the corresponding time interval into a code that characterizes the speed of propagation of the seismic wave and is fed to digital d converter 12 code into the corner.

Converter 12 code in the corner works as follows

 Signals from converters 10 are input to the inputs of circuit 14-16. From the output of first circuit 14, signals are fed to the first input of the first multiplier 19 and to the second input of the third multiplier 21. From the output of the second square 15 circuit, the signals go to the second input of the first multiplier 19 and the first input of the second multiplier 20. From the output of the third circuit 16, the signals arrive at the first input of the third multiplier 21 and at the second input of the second multiplier 20. From the output of the first multiplier 19, the signal arrives at the input of the multiplication circuit 22 to the constant multiplier itel, and from its output to the first input of the adder 26. From the output of the second multiplier 20, the signal through the inverter 23 is fed to the second input of the adder 26 and to the first input of the adder 27. To the third input of the adder 27 receives a signal from the output of the third multiplier 21, which is previously inverted the inverter 24. From the output of the inverter 24, the signal also goes to the second input of the adder 27. The signals from the adders 26 and 27 through the circuits 17 and 18 squaring go to the first and second inputs of the adder

28, respectively. From the output of the circuit 17, the signal is also fed to the first input of the dividing circuit 29, to the second input of which a signal is received from the output of the adder 28. From the circuit output

29 the signal inverted by the inverter 25 is fed to the input of the addition circuit 30 with a constant term, from the output of which the signal goes to the input of the extraction circuit 31. root, From the output of circuit 31, the signal is fed to the input of the second circuit 32 of addition with a constant term, and

from its output through the scheme 33 dividing by a constant number to the input of the second circuit 34 extracting the root. From the output of circuit 34, the signal enters the circuit 35 for calculating the inverse trigonometric function, which calculates the angle between the radius connecting the seismic wave excitation point and the second channel sensor 1, and the main direction of seismic wave propagation using the formula

PIq "arcco5A

and w-g-n) k & -n,

m-vf-V;

a + k

E-Vj.v; h, i Vj - propagation velocity

waves between the emitter and the first sensor} Vj - the same, between the emitter and

the second sensor, Vj - the same, between the emitter and

the third sensor. From the information circuit 35, a digital indicator 13 is supplied.

9ig.2

Claims (3)

1. A method for determining the propagation parameters of seismic waves in a rock mass, including the excitation of seismic waves and multichannel measurement of the speed of their propagation by a group of geophones, characterized in that, in order to increase the information content of the method by measuring the direction of propagation of seismic waves in a geographic coordinate system, one of the geophones set at the point of excitation of seismic waves, while others are arranged around a circle with a fixed angle between them, while yc connecting point with the excitation spot installation geophone first channel is aligned with the CE. _{In the} correct direction of the meridian, they measure the propagation velocity of seismic waves along all channels and determine the angle between the direction of their propagation and the direction to the north. S U ..., 1208522 2. A device for determining the propagation parameters of: seismic waves in a rock mass: rocks, including η parallel channels, each of which contains a seismic sensor, a frequency filter, an amplifier, an amplitude noise filter with an indication and adjustment unit, a threshold stage, a reference pulse shaper, in this case, all channels, except the first, contain a terminal cascade connected to a converter of time intervals into a code, and the device includes a counting pulse generator connected to the input m final: cascades, and a shock unit, characterized in that, in order to increase the informational content of the device ^ by calculating the direction of propagation of seismic waves in the geographic coordinate system, a digital code to angle converter is inserted into the device, to which the outputs of time interval converters to code are connected , and in each channel, except the first, triggers are introduced between the reference pulse shapers and the end stages, while the second inputs of the triggers are connected to the outputs of the reference pulse shaper the first channel 3, The device according to claim 2, characterized in that the digital code-to-angle converter contains five squaring circuits, three multipliers, a constant multiplier circuit, three inverters, three adders, a division circuit, and a first addition circuit with a constant connected in series term, the cdrn extraction scheme, the second constant addition circuit, the constant division scheme, the second root extraction scheme, the inverse trigonometric function calculation circuit and the digital indicator, the inputs of the first three circuits being The squaring is connected to the outputs of the time slot converters into a digital code, the output of the first squaring circuit is connected to the first input of the first multiplier and the second input of the third multiplier, the output of the second squaring circuit is connected to the second input of the first multiplier and the first input of the second multiplier, and the output of the third squaring circuit is connected to the second input of the second multiplier and the first input of the third multiplier, the output of the first multiplier through the constant multiplier multiplying circuit with the first input of the first adder, the second input of which is connected through the inverter to the output of the second multiplier, also connected to the first input of the second adder, the second input of which through the second inverter is connected to the output of the third multiplier, while the inverter is also connected to the third input of the first adder, the output of which through the fourth squaring circuit connected to the first input of the third adder and the division circuit, the output of the second adder through the fifth squaring circuit connected to the second input of the third sum Ora, the output connected to the second input of the division circuit, the output connected to the input of the third inverter connected to the input of the addition circuit with a constant summand, the output of which is connected in series to the constant number division circuit, the root extraction circuit, the second addition circuit with a constant term, division circuit a constant number, a second root extraction scheme, a scheme for calculating the inverse trigonometric function and a digital indicator.