SU913297A1 - Vibrational source of seismic signals - Google Patents

Description

The invention relates to tserfizi- direction ^- applied at seismic minerals.

Known vibratory sources of seismic signals are ineffective in the area of a marshy, covered with a thinned or loose peat layer, the thickness of which can reach several meters. In these cases, the base plate is not able to provide reliable force contact with the surface, as a result of which the excitation efficiency of the wave decreases sharply. A liquefied or loose surface layer absorbs vibrational energy without passing it into the deeper layers of the medium.

Known vibration source of seismic signals for work on wetlands, containing a hydraulic vibration exciter, including a hydraulic booster and a hydraulic cylinder formed by a reactive mass and a rod connected to

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base plate. In order to ensure reliable contact with the rock in wetland conditions, the base plate is made in the form of a conical chamber, which expands downwards, and is connected by a hose through a filter system to a vacuum pump, which creates a reduced pressure in the conical chamber, ensuring that it sticks to the surface layer of the marsh or the bottom of the reservoir [1].

The drawbacks of the device are its complexity due to the use of vacuum equipment, as well as the fact that the device can ensure reliable contact with the surface, which has only a small thickness of the thinned layer, and is not applicable in areas covered with thick (2 ...

5 m) a layer of snow, peat bog, which

prevent spontaneous immersion

cause of the causative agent of vibration and in view of

its porosity does not allow vacuum suction.

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913297

four

The closest to the proposed technical essence and the achieved effect is a vibratory source of seismic signals, including a vehicle, an exciter of vibration, a reactive mass and an active mass with a base plate.

At the initial position, the vibration pathogen is lowered until the base plate touches the ground and the weight K

vehicle plate is pressed against the ground. During the operation of the vibration exciter, vibrations of the active mass are transmitted to the base plate, which excites the seismic wave (2).

The disadvantage of this vibration source is low efficiency in a wetland or terrain with a thinned or loose surface layer.

The purpose of the invention is to increase the efficiency of the source on wetlands and soils with thinned or loose surface layer. 2 '

This goal is achieved by the fact that in a vibration source comprising a vehicle, a vibration agent, a reactive mass and an active mass with a base plate, 3 (the connection of the base plate with the active mass is made with the possibility of adjusting the distance between them.

FIG. 1 shows the source, general view; in fig. 2 - vibration exciter with base plate.

The device consists of a vehicle 1 capable of moving and transporting equipment through wetlands, and a hydraulic vibration exciter 2 comprising a hydraulic cylinder formed by a reactive mass 3 by a plunger 4 constituting, together with frame 5, an active mass. The connection of the active mass with the base plate 6 is carried out using the rod 7, moving inside the plunger 4 using the launch device 8, and the rigid coupling of the rod 7 ⁵¹

with the plunger 4 during operation of the vibrator is carried out using a clamping device 9 · Static load of the support plate is produced by the weight of the vehicle 1 through the pneumat · ⁵ mpopora 10.

The device works as follows.

In the transport position, the base plate 6 of the hydraulic vibration exciter 2 is raised. At the initial position, the slab is lowered and crushed into a peaty or thinned surface layer of soil with a vehicle weight. For a more efficient immersion of the base plate, the vibration generated by the hydraulic exciter 2 or the rotation (drilling) of the plate can be used. Having reached the base plate more rigid structures of the medium, the rod 7 is rigidly coupled to the plunger 4 by means of a clamping device 9 · When the hydraulic vibration exciter is turned on, the vibrations of the plunger 4 are transmitted by the rod 7 to the base plate 6, radiating the seismic wave directly into the rigid structures of the examined medium, which increases efficiency vibration pathogen.

The connection of the base plate with the active mass of the exciter of vibration with the possibility of regulating the distance between them allows the use of a vibratory source of seismic signals in wetlands that have a thin or loose surface layer up to several meters thick. Lowering the base plates through the upper layer can be effectively carried out using vibration or their rotation. In the latter case, the base plate may be in the form of a gimlet.

Claims (1)

Claim Vibration source of seismic signals including a vehicle, a vibration pathogen, a reactive mass and an active mass with a base plate, characterized in that, in order to increase the efficiency of the source on wetlands and soils with a liquefied or loose surface layer, the base plate is connected to the active mass with the ability to control the distance between them.