SU440623A1 - Device for exciting seismic vibrations - Google Patents

Description

one

The invention relates to seismic exploration. Devices are known that use the impact energy or the energy of shielded explosions of linear explosive charges on the day surface to excite elastic oscillations. In the first case, the load is carried out on a stand located on the ground surface, or directly on the ground. The load has a non-deformable surface and is pre-accelerated to a certain speed (Vo) with the help of field energy, a compressed spring, an explosion of a combustible mixture, etc., or using combinations of energy from the sources mentioned above. As a rule, such devices do not provide for adjusting the impact force on the ground area, which does not allow matching the impact energy with the capacity of the ground area on which it is made, and leads to the appearance of repeated impacts of a large force associated with the loading of the load due to increasing elastic resistance of the medium during its compaction. The operation of the device in this case is carried out outside the elastic deformations of the medium; the impact energy is irrationally spent on plastic deformations. To increase the KP in these cases it is rational to reduce the energy of a single impact to apply group effects, however

the latter leads to the need for bulky equipment. In the second case, when using the energy of shielded explosives to excite elastic oscillations, the possibilities of controlling the radiation area of the source are significantly increased, however, to obtain a good shielding effect, completely excluding the sound wave from the seismic recording and

The elimination of repeated shocks caused by the propelling effect of the products of the explosion of explosive charge on the device requires a large reactive load on the screens, which creates significant inconveniences when working with them.

The purpose of the present invention is to increase the transfer to the ground of the explosion energy of a linear explosive charge, eliminate the influence of the sound wave on the seismic record, and also increase the device durability.

This is achieved by including a screen with holes in the device, and a muffler with variable input and output channels is installed on top of the container, and a disk is rigidly fixed on one end of the half-cylinder, and the other end has a screw cap on it. The drawing shows the proposed device.

The device contains the following elements: valve 1, cover 2, power screw 3, gasket 4, diaphragm 5, regulator 6, body 7, silencer 8, gasket-dampers 9, metal mesh 10, angle 11, screen 12, linear charge 13 channels 14 with outlet 15 and inlet 16 holes, supporting the edges 17 of the angle.

According to the invention, the goal is achieved by creating a device (see drawing) consisting of double semi-cylindrical links containing a scrap 12 n body 7 n covered with a membrane 5, through which the energy of the explosion of a linear charge 13 located inside the screen at the corner of And and separated by a metal mesh 10 is transferred to the ground. The screen 12 is centered in the housing 7 by means of shock absorbing pads 9 and freely extends from the housing 7. The housing is closed on one side at one end, and on the other is closed by a lid 2 using a power screw 3. To ensure sealing, the lid 2 is equipped with a gasket 4. With By means of the outlets 15, the channels 14 between the outer surface of the screen and the inner surface of the housing and the inlet 16, the inner subscreen space communicates with the silencer 8. The dimensions of the outlet 16 are changed using the regulator 6. Valve 1 provides the sealing of glustptel at the exit of the gaseous explosion products from it. In order to reduce the destructive effect of explosion products on the membrane, explosive charge 13 is separated from it and separated by a metal grid 10.

When working with the device, a platform is preliminarily prepared on which it is located and the raft is in contact with the membrane with the ground. Using screw 3, the end cap 2 is opened, screen 12 is pulled out of housing 7 and the device is charged. After charging, the screen 12 is inserted into the housing 7. Through the lid 2, the combat main wires are supplied to detonate the charge, after which the front portion of the housing is closed. At the time of the explosion of the explosive charge 13 under the screen 12, the membrane 5, connected to the housing 7, prevents the device from being thrown due to the propelling effect of the gaseous products of the explosion and simultaneously affects the ground, together with the energy of the explosion, a certain amount of movement. The gaseous products of the explosion through the holes 14 through the channels 15 enter the silencer 8 and, after passing through its channels and damping speed, are released into the atmosphere, which eliminates the sound waves from the seismic recording. The impact force of the membrane on the ground is controlled by changing the amount of charge exploded under the screen, as well as by changing the size of the channels through which the gaseous explosion products are removed from under the screen to the silencer. The device is designed to work at the limit of elastic deformations of rocks composing the upper part of the section, and therefore there is no need for an explosion of large charges under the screen, which would impose significant limitations on the possibility of its manufacture due to the lack of materials with the necessary strength characteristics. The intensity of the excited elastic pulse is controlled by

the use of group actions, and the matching of the intensity of individual actions with the parameters of the environment — by selecting the magnitude of the charge and the controller — the silencer. Conditions for the transfer of explosive energy of explosive charge

When using the proposed device, the soil is improved by eliminating the direct impact of explosive products on the ground and the associated damage to the loss of explosive energy in the loosening zone.

It should be noted that the proposed device can also be used to excite elastic oscillations in water. At the same time it must be supplemented with a system of tap

gaseous products of the explosion, which would ensure the elimination of repeated shocks associated with the exhaust of gas bubbles.

Subject invention

Claims (4)

1. A device for exciting seismic vibrations, consisting of an explosive charge placed in a container with a transfer membrane, characterized by By the fact that, in order to increase the transfer to the ground of the explosion energy of a linear explosive charge, eliminate the influence of the sound wave on the seismic recording, as well as increase the durability of the device, the container is made in the form of a hollow elongated half-cylinder, inside which is a screen with openings, on top of the container there is a silencer with variable input and output channels, and on one The end of the semicilpdra is rigidly fixed to the disk, and the other end is provided with a screw cap. 2. The device according to claim 1, characterized in that shock-absorbing pads are arranged between the container and the screen. 3. A device according to claim 1-2, characterized in that a grid is located between the charge and the transfer membrane inside the screen. 4. A device according to claim 1-3, characterized in that the screen is made in the form of a hollow elongated half-cylinder without a bottom.  / V W163 P. P, PI P, P. P, P, P, P. P, P, P. P . P . h LL LL LL / five JS / 7 /,