SU1198156A1 - Apparatus for determining dynamic properties of soil in a well - Google Patents

Abstract

DEVICE FOR DETERMINATION OF DYNAMIC PROPERTIES OF SOIL IN A WELL, comprising a housing, sliding seals mounted in the guide housing, the mechanism of their razdvizheniya, exciter directional effect disposed within the housing, and vibration sensors for measuring horizontal vibrations fixed on schtampah, characterized in that, in order to expand the functionality and improve the accuracy of determining the dynamic characteristics of the soil, the device is equipped with a pressure source, and the mechanism of expansion The MPA is designed as an autonomous elastic chamber, measures connected to a pressure source and located between the side surface of the body and the dies, while the Bibroactivator is associated with two diametrically opposite sliding walls. stamped by spring.Q

Description

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ABOUT)

The invention relates to construction and can be used in engineering and geological surveys.

The purpose of the invention is to expand the functionality and improve the accuracy of determining the dynamic characteristics of the soil.

FIG. 1 shows the proposed device, a longitudinal section; see 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a longitudinal section in FIG. one.

A device for determining the dynamic characteristics of a soil in a borehole includes a housing 1 with a directional vibration exciter 2 mounted in the housing 1 in horizontal straight guides 3 parallel to the guides 4 on the housing 1, two diametrically opposed rigid punch 5 with which the vibration exciter is coupled by springs 6 and which, together with two other rigid dies 7, mounted in the guides 8 on the housing 1, perpendicular to the guides 4, encompass autonomous elastic chambers 9, are placed on the side surface of the housing 1, the inner cavities are filled with liquid or gas and communicate with a static pressure source (not shown). To fix the dies 5 and 7 in the initial static position, other elements are used, for example springs 10. Dies 5 are fixed to vibration sensors 11 of horizontal displacements.

The device works as follows.

The device on the cable is lowered to a predetermined depth in the well. By flexible hose -A

A fluid (not shown) smoothly pumps the working fluid into the chambers 9, which press the rigid punches 5 and 7 into the borehole wall and hold them in this position throughout the test. Then, the vibration exciter 2 has a directional effect, which, having made horizontal translational oscillatory movements in the guides 3, through the springs b drives the dies 5, which will make horizontal oscillations in the guides 4 relative to their average static equilibrium position. In this case, the stamps 5 will perform common-mode horizontal oscillations. Vibration sensors 11,

5 mounted on the dies 5, produce signals proportional to the vibration velocity of the dies 5 in the horizontal direction, which are recorded by devices placed on the surface. The tests are carried out at different vibration frequencies of the vibration exciter 2. Then the vibration exciter 2 is turned off, the static pressure in the elastic chambers 9 is relieved, as a result of which, under the action of the springs 10, the dies 5 and 7 respectively return along the guides 4 and 8 to the initial position, and the device is removed from the well . Due to the fact that only two mutually opposite stamps participate in the oscillations, representing in the cross section of a circular arc of about 90 °,

0 then, on their surface, the diagram of normal stresses approaches uniform, and the tangential stresses along the edges of this arc are negligible. Thus, the device provides an almost uniform stress state and, as a result,

5 improves the accuracy of determining the dynamic characteristics of the soil corresponding to normal dynamic stresses.

Claims (1)

DEVICE FOR DETERMINING DYNAMIC CHARACTERISTICS OF SOIL IN A WELL, including a housing, sliding dies installed in the guides of the housing, a mechanism for their separation, a directional vibration exciter located inside the housing, and vibration sensors for measuring horizontal vibrations mounted on the dies, characterized in that, with the purpose of expanding the functionality and improving the accuracy of determining the dynamic characteristics of the soil, the device is equipped with a pressure source, and the mechanism for the expansion of the dies in made in the form of self-contained elastic chambers connected to a pressure source and placed between the side surface of the housing and the dies, while the vibration exciter is connected to two diametrically opposite sliding dies by means of springs. AND FIG. /