SU1206382A2 - Apparatus for investigating soil properties - Google Patents

Description

The invention relates to construction, to devices for studying the physicomechanical properties of the soil, can be used to simulate the natural conditions of the soil, and is an improvement on the invention by the author. St. No. 939637.

The purpose of the invention is to increase measurement accuracy and enhance functionality. FIG. 1 shows the proposed device, a general view of FIG. 2 - electrical circuit device.

Device for researching properties. I soil consists of a centrifugal installation (not shown), housing 1 with glass 2, filled from a dielectric, inside which are plates 3 and 4 of a cylindrical capacitive element, which are a series of identical coaxial cylinders separated from each other. The plates 3 and 4 form a capacitor C / J, each pair of mutually intersecting coaxial cylinder of which in air has an equal electrical capacitance. In turn, the lining 4 together with the lining 5, pressed on the side surface of the hammer 6, form a capacitor C g. Drummer 6 through the bark 7 is held in the initial state by the electromagnet 8 of direct current. The lower part of the hammer 6 is a stamp 9.

The cover 3 is tensioned on the cup 10, the cover 4 is pressed into the cylinder 11, which, together with the cup 10, is a support for the key 12 j pressed by the head 13. The inner chamber is the glass 14, the bottom 15, Investigated the soil 16 is located in the inner cylindrical and outer annular chambers. The plates 4 and 5 are separated with a mica insulator 17. The plates 3 and 4 have access to the measuring bridges of alternating current P-5004 through terminals 18 and 19. The plates 4 and 5 have access to the measuring bridge P-3004 through screws 20 and 21 .

The frame, the coils of the electromagnet 8 DC is attached to the bottom

chambers 22. A flange 23 is attached to a lid 24, onto which a lid 25 is screwed, protecting the terminals of the plates, as well as terminals 2 & supplying power to the coil of an electromagnet.

The device for the study of soil properties works as follows.

When the centrifugal unit (not shown) is turned on, the housing 1 begins to rotate, and the ground placed in the inner and outer annular chambers, under the influence of the resultant centrifugal forces and gravity, begins to condense, resulting in a change in its dielectric constant. Since the value of the dielectric constant is determined by the packing density of soil particles, it varies in depth because the underlying layers with depth feel different pressures of the upper layers. The density of the soil is determined by measuring the capacitance of the capacitor Cd using the measuring bridges P-5004.

In addition, the device makes it possible to obtain a distribution of normal stresses in depth for a uniform and layered soil.

To calibrate the scale of the P-5004 between the plates of the CA condenser, a number of soils with different relative humidity are sealed, which are compacted with a punch. This makes it possible to obtain a scale for the dependence of the electrical capacitance on the density value for a wide range of humidity, which makes it possible to measure the density of various soil samples directly over the depth of the floor.

After compaction of the soil, the electromagnet 8 is de-energized, and the drummer 6 (under the action of centrifugal forces ensures the introduction of the stamp 9 into the soil under study.

The application of the proposed device makes it possible to measure the density and distribution of the soil stress directly over the depth of the bed, and also to significantly improve the measurement accuracy.

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VNIIPI Order 8662/30 Circulation Circuit Subsidiary PPP Patent, Uzhgorod, Proektna St., 4

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Claims (1)

DEVICE FOR RESEARCH OF SOIL PROPERTIES by ed. No. 939637, characterized in that, in order to increase the accuracy of measurements and expand the functional capabilities, in the measuring device two plates of a cylindrical capacitive element installed along the steaks of the soil chambers are divided into a number of identical coaxial cylinders equipped with terminal leads connected with measuring bridges. > 206382 2