SU966147A1 - Apparatus for testing soil samples in three-dimensional compression - Google Patents

Description

The invention relates to construction, in particular, to a technique for determining the strength and deformation properties of soils under three-axis compression in natural conditions, and can be used in engineering geological surveys.

A device for testing soil for triaxial compression is known, comprising a housing, a chamber of three axial compression with a flexible shell and a piston, a pulsating attachment, a load and measuring devices 1.

The closest technical solution to the present invention is a device for testing soil samples for triaxial compression, comprising a housing, a working chamber with an elastic ruler and a punch, devices for creating vertical and lateral pressure on the sample and for measuring its axial deformation 25.

The use of these devices in testing water-saturated soils of a fluid-plastic consistency does not provide reliable, results because of the violation of samples during the process of their selection, transportation and storage. Especially

This refers to the seabed soils that were under natural conditions under considerable hydrostatic pressure, when removed, the structure and mechanical properties of the specimen significantly changed.

The aim of the invention is to provide the possibility of triaxial testing of samples of water-saturated soil.

10 fluid plastic consistency, for example, seabed soils in terms of their natural occurrence.

The goal is achieved by the fact that the device for testing soil samples on a three-axis compression, comprising a housing, a working chamber with an elastic jacket and a punch, a device for creating vertical and lateral pressure on the sample and for measuring its axial deformation, is equipped with a surrounding projectile with a column of rods and hoses at the upper end and a ground receiving sleeve with a trimming mechanism

25 core at the lower end, and the subtraction mechanism is set between the working chamber and the ground receiving sleeve.

 At the same time the mechanism of trimming core

thirty

designed as a flat fig system

The blades hinged on the upper end of the soil receiving hillet, and the punch is equipped with a contact sensor.

FIG. 1 shows the stabilometer immersion scheme; in fig. 2 is a stabilometer diagram.

The device consists of a stabilometer 1, a floating base 2, rods 3, a casing 4, a source of operating pressure 5 and test equipment b connected with. a stabilometer 1 with a cable 7 and hoses 8. A working chamber 9 of the stabilometer It is equipped with an inner elastic sheath 10 located in the tubular housing 11 / at the lower end of which the ground receiving sleeve 12 with mortise blades is fixed. A mechanism for trimming a soil sample, made in the form of a flat system of figured knots 13, is located between the aglera 9 and the sleeve 12. A die 14 is located above the working chamber 9, creating vertical pressure on the sample by means of a hydraulic cylinder 15. In the punch 14, a contact sensor 16 is mounted, which signals the loading of the sample into the working chamber 9. A displacement sensor 17 is mounted above the hydraulic cylinder 15, which measures the sample draft

The device works in the following way.

The primer sleeve 12 cuts into the previously cleaned bottom of the well up to the stop of the upper end of the sample into the punch 14. Then the housing 1 rotates, providing the undercut of the sample using the knives-13 system. sample according to the procedure adopted for laboratory tests.

The use of the device allows triaxial testing of water-saturated soils with a fluid-plastic consistency, such as seabed soils, without disturbing their structure and obtaining reliable data on their

mechanical properties, which is especially important for solving technical problems associated with the development of the shelf.

Claims (3)

1. A device for testing soil samples for triaxial compression, inclusive body, working chamber with elastic jacket and poop, device for creating vertical and lateral pressure on the sample and to measure its axial deformation, characterized in that, in order to enable triaxial testing of water-saturated soil samples of a fluid-plastic consistency, such as seabed soils under natural conditions, it is provided with a covering rod with a rod and hoses at the top end and ground-. receiving sleeve with a mechanism for trimming the core at the lower end, and the trimming mechanism is installed between the working device and the ground receiving sleeve. 2. The device according to claim 1, which is so that, in order to achieve the most compact design, the core trimming mechanism is made in the form of a flat pipe of figured knives, hinged on the upper end of the receiving shaft, Shl .- /: ... . -, 3. The device according to i. This is so that, in order to ensure accurate fixation of the moment of sample loading into the working chamber, the punch is equipped with a contact sensor. Isa: full-time information taken by BO attention when examining 1. USSR author's certificate No. 577425, cl. E 02 D 1/00, 1976.  2. Guidelines for determining the deformation strength and filtration characteristics of rocks in stabilometers. Belgorod, 1973, p. 14 (prototype). -f AA