SU1286935A1 - Stabilometer for testing rock at three-dimensional state of stress - Google Patents

Abstract

This invention relates to the field of strength testing of various materials. The purpose of the invention is to improve the accuracy and reduce the laboriousness of the tests in both hard and soft modes. The internal cavity of the housing 1 is made in the form of four elliptical cavities (EP) intersecting in the center 2. They are separated from each other

Description

Aa

about $

(L

another sliding movable strips 10 installed in the grooves 11 of the housing 1. In each of the EP 2 there are two cylindrical elastic shells (EO) 8. Between them are the rods 9. In the housing 1 there are peripheral holes that are connected by grooves 11 with EP 2. In The openings x have additional EOs 12. The bars 10 are on one side in contact with the test specimen (EUT) 7, and on the other, with EO 12. For the EUT 7 tests

one

The invention relates to a technique of testing materials, in particular, devices for physico-mechanical studies of rock samples under complex stress conditions.

The purpose of the invention is to increase accuracy and reduce the complexity of the tests.

Fig. 1 shows a diagram of a stabilometer for testing rocks with a three-dimensional stress state in Fig. 2 — section A-A in Fig. 1.

The stabilometer includes a housing 1, the internal cavity of which is made in the form of four elliptical cavities 2 intersecting in the center, a bolt 3 with a ball joint 4 and a stepped plunger 5 with a base 6, which serves to transfer the axial pressure to the sample 7. Each elliptical cavity 2 two cylindrical elastic shells 8 are located. Measuring rods 9, used to measure transverse deformations of sample 7, are located between each pair of elastic shells 8 and extend out of the body through holes made in the body Pusa 1. Elliptic cavity 2 are separated from each other by moving the split bars 10 which are mounted in the grooves 11 of the housing. Ball liners are used to reduce friction between the slats 10 and the walls of the grooves .11. On the one hand, the strips 10 are in contact with the sample 7, on the other - with additional elastic shells 12 located in the peripheral cylindrical holes

set in EP 2, and the body - on the press. With it, axial pressure is created on the IO 7. The rods 9 are in contact with IO 7. Then, working fluid is injected into the cavity of the EO 8 and 12. Under its pressure, EO 8 and 12 fill EP 2 and the holes in case 1 transfer pressure to side surface E07. The axial pressure of IO 7 is brought to destruction. By extending the rods 9 from the housing 1, the lateral deformations of the IO 7 are determined. 1 Cp, f-ly, 2 ill.

ABOUT

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x housings 1. The elastic shells 8 and 12 are fixed on the housing 1 by means of fittings 13 and connected to hydraulic pressure sources (not shown). The valve 14 serves to release the low-compressible fluid from the cavity 15 in the hard loading mode. The axial pressure on the sample 7 is created using a press (not shown). Elastic shells 8, located in opposite elliptical cavities x 2, are connected to each other by pipelines (not shown). Each elastic sheath 12 is connected by pipelines with a pair of elastic shells 8 located in the nearest elliptical cavity 2 (closest in a clockwise direction in FIG. 2). The spring elements 16 serve to pre-clamp the measuring string 9 against the sample 7.

The stabilometer operates as follows. Sample 7 of the rock is installed in the internal cavity 2 of the housing 1. The measuring rods 9 are brought out of contact with the sample 7. After installing the sample 7 on the stabilometer housing 1, the cover 3 is fixed with the ball bearing 4 and the stabilometer is installed on the press. The load from the press on the sample 7 is transferred to a pressure equal to about 0.05-0.10 of the uniaxial compressive strength (the valve 14 is open at the same time). The stranded and living elements 16 contact the measuring rods 9 with the sample 7. Thereafter, into the inner

The cavity of the cylindrical elastic shells 8 and 12 from the pressure sources (pumps) is pumped working fluid (for example, compressor oil). The elastic shells under pressure from the liquid fill the elliptical cavities 2 (shells 8) and the holes in the body (shells 12) and transfer pressure to the lateral surface of sample 7. After creating the necessary side pressure, sample 7 is loaded with axial pressure from the press to fracture. The lateral deformations of sample 7 are determined by extending from the body 1 of the measuring rods 9 connected to a measuring element (not shown), longitudinal along the indicator (not shown) of the clock type, fixed between the base 6 and the stabilometer case 1.

When testing in

in hard mode, cavity i: is filled with a mapping liquid and valve 14 is closed. When the stabilometer is loaded with axial pressure, the load on sample 7 is regulated by gradually releasing a low-compressible fluid from cavity 15 through valve 14. This test mode allows testing of rock samples beyond the tensile strength. In soft tests, the valve 14 is open permanently and the low-compressible fluid does not exert co-operation. A stabilometer for testing rocks in a three-dimensional stress state, comprising a housing for opening; the sample of rock, stu- ggenghenny plunger for transferring axial pressure to the sample, elastic shells for lateral loading of the sample, installed in the body, and sources of medium pressure, communicated with the cavity - 25 shells, differing in that increasing the accuracy and reducing the labor intensity of the tests; it is provided with straps installed in the housing with the possibility of moving in radial directions, additional elastic shells in contact with opposite ends of the slats relative to the sample, and terzhn E arranged between the main

thirty

During deformation of the sample 35 by elastic shells and designed to measure the deformations of the sample, while in the case there are elliptical cavities for the main shells and peripheral

7 (the sample is completely destroyed when the axial load of the conversion value is reached).

Thus, the stabilometer allows testing in both hard and soft mode tests under a three-dimensional stress state.

(J, b, b2 Cz; C, G2 / C ;; C, b2.b5; b, C2 bz; 0, 0.6, (3; Cz, 0, 2 be.

At p. 6 the fluid pressure in all elastic shells 8 and 12 is the same. Prio ,, 5 G, the same pressure is applied to elastic shells located in opposite elliptical cavities.

The invention permits testing on cylindrical specimens and provides an increase in the service life of elastic shells, since the interaction of the shells under different pressures is eliminated.

Claims (2)

1. A stabilometer for testing rocks in a three-dimensional stress state, comprising a housing for opening; the rock specimen, the stangenera plunger for transmitting the axial pressure on the specimen, elastic shells for lateral loading of the specimen installed in the housing, and sources of pressure of the medium communicated with the cavity of the shells, which, in order to increase accuracy and reducing the labor intensity of the tests; it is equipped with slats installed in the housing with the ability to move in radial directions, additional elastic shells in contact with opposite ends of the slats relative to the sample, and st between the main elastic shells and designed to measure the deformation of the sample, while in the case there are elliptical cavities intersecting in the center for the main shells and peripheral openings for additional shells are connected by grooves with elliptical cavities, and the main shells are cylindrical and separated by strips extending through the slots. 2. A stabilometer pop-1, characterized in that the strips are made split.  : K / 27 / L P 1