SU1504553A1 - Apparatus for shear testing of soil - Google Patents

Abstract

The invention relates to a test technique and allows the determination of the mechanical characteristics of soils during shear. The purpose of the invention is to improve the accuracy and enhance the functionality by shifting the soil, not only when it is static, but also dynamically compacted. The soil is tested by the relative shift of a number of coaxially identical clips 3, which form a chamber for it. The shift is carried out on a stationary or working vibroplatform 12. At the same time, the shear force and the displacement of the piston fitting 11 with a constant pressure of the compaction of the soil are measured simultaneously. The accuracy of the tests is increased due to the backlash-free chamber and the determination of the change in the volume of the soil during the test, both from the action of the ball stress tensor and from the voltage deviator. Tests for cutting soil are similar. The cutting plane is formed by connecting the elements of 5 parts of the clips 3 rows with each other. 1 hp ff, 2 ill.

Description

I

(21) 4373461 / 25-28

(22) 08.02.88

(46) 08/30/89. Bup. Number 32

(71) Research Institute of Building Constructions Gosstro of the USSR

(72) A.M.Ryzhov, A.S.Kyudenko and E.Ya.Pripolov

(53) 620.176.24 (088.8) (56) USSR Copyright Certificate 299775, cl. G 01 N 3/24, 1971.

(54) DEVICE FOR SOIL ISOLATE FOR SHIFT

(57) The invention relates to test. technology and allows the determination of the mechanical characteristics of soils during shear. The purpose of the invention is to improve the accuracy and enhance the functionality by shifting the soil, not only when it is static, but also when it is dynamically compacted. The soil is tested by

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51504553

nasntelnogo shift a number of coaxially identical clips 3, which form for him a camera. The shift is carried out on a stationary or working vibroplatform with form 12. During the shift, the shear force and the displacement of the piston fitting 11 with a constant pressure of the compaction of the soil are measured simultaneously. Accuracy of isphaniye is increased due to foolless

The invention relates to a test apparatus, namely, devices for determining the mechanical characteristics of soils during shear.

The purpose of the invention is to increase the accuracy and expansion of functional capabilities by shifting the soil not only with static, but also with its diamic compaction.

FIG. 1 shows the proposed 25 device; in fig. 2 shows section A-A in FIG. one.

The device comprises a body 1, made in the form of a glass, placed therein with the possibility of moving 30 in its plane a plate 2, a chamber mounted on the plate 2, formed by a series of coaxially identical metal holders 3 and intended for placing the test soil 4, 35 connecting elements 5, designed to rigidly connect part of the clips 3 in series with each other, mounted on the housing 1 gland element 6, which ensures the contact of the clips 3 40 with each other, and the cover 7 of the chamber with the central hole located in the chamber e and intended for compaction of soil 4 a piston made in the form of a plate 8 located on the dd of the surface of the soil 4, an elastic bag 9 located between the lid 7 of the chamber and the plate 8 to form an airtight cavity 10, and a fitting 11 fixed on the plate 8 aisle .. through the hole in the roof 7 and intended for submission to the hermetic cavity of the working environment.

The device also contains a vibroplatform 12 on which the housing 1 is located, a mechanism for moving the plate 2, made in the form of a worm gear, the screw 13 of which is fixed on the vibroplatform 12, and a wheel (not

A smart camera and the determination of the change in the volume of the soil during the test, both from the action of the ball stress tensor and from the voltage deviator. Tests for cutting soil are similar. The cutting plane is formed by connecting 5 parts of the clips 3 rows with the eggs and each other. 1 hp f-ly. 2 Il.

shown) associated with the stop 14 with the plate 2, the indicator 15 of the movement of the piston nozzle 11 and the load measuring device shear plate 2 (not shown).

In addition, the device contains installed between the clips 3 gaskets 16 of antifriction material, such as Teflon.

The device works as follows.

A chamber equipped with a series of metal holders 3 is filled, grinding: volume 4. A plate B of the piston is placed on its surface. The chamber is closed with a lid 7. A constant pressure of the working medium is created in the hermetic cavity 10 of the piston and thereby compacts the soil 4. The drive (not shown) of the mechanism for moving the plate 2 is turned on. During the relative shift of piles 3, and consequently of the shift of soil 4 measure the magnitude of the shearing force and the corresponding moment of time, the magnitude of the movement of the fitting 11, which characterizes the loosening or compaction of the soil 4 in the process of its shift.

Similar tests and measurements are carried out with the inclusion of a vibroplatform.

The backlash-free formation of the chamber by clips 3, the low friction between them, as well as the determination of the change in soil volume during the test, both from the ball stress tensor and from the stress deviator, increases the accuracy and informativeness of the static and dynamic tests of the soil 4 during its shear.

The testing of soil 4 for cutting along a given plane is carried out in the same way as described with the difference that the elements 5 rigidly connect parts of the clips 3 rows with each other to form 5150

only one plane of their possible relative displacement.

Claims (2)

1. An apparatus for testing a shear, comprising a housing placed therein with the possibility of moving a slab in its cavity, a chamber mounted on the slab, a series of coaxially identical clips, connecting elements intended to rigidly connect part of the casing to each other another, a piston located in the chamber and intended to compact the soil, and a plate movement mechanism, characterized in that, in order to increase the accuracy and enhance the functional possibilities by shifting the soil, not only with static com. . but also when it is dynamically compressed, the device is equipped with a piston movement indicator, a clamping element of the clips to each other, fixed on the housing with a cap with a central hole and a vibroplatform associated with the housing, and the piston is made in the form of a plate, an elastic bag located between the chamber and the plate with the formation of an airtight cavity, and a socket attached to the plate passing through the hole in the valve and intended to be supplied to the sealed cavity of the working medium. I 2. A device according to claim 2, characterized in that it is provided with gaskets of antifriction material installed between the yoke. 12