SU1234625A1 - Apparatus for determining the strength of rock in body - Google Patents

Description

The invention relates to mining and can be used to determine the strength of rocks in a massif.

The purpose of the invention is to improve the accuracy of rock strength measurement by allowing for shear tests with compression in the depth of the massif and simplifying the design.

FIG. 1 shows the device, a general view; in fig. 2 — order of transfer of the device from the transport to the working position; in fig. 3 - installation groove in the wall of the housing.

The device consists of a housing 1, an element 2 fixed to it, with an autonomous hydraulic line 3 connected to a pump 4, shifting elements 5, a ball-20 VD elements that are located transversely attached to a slider 6, and gi 7 connected to a slider 6 and a hydraulic drive 8 with a source of 9 pressure. The pressure gauges 10 serve to control the pressure of the working fluid in hydraulics 8 and the loading element 2. The body end is closed by a centrifugal tip 11, having a diameter close to the diameter of the well, which allows for alignment of the body with the well. The shifting elements 5 have a first thickened shoulder 12, a second shoulder 13 of lesser width, a flat support 14 and are pressed against the case by an elastic ring 15. in the case at the participating site 22 of the test area. /: f f. .f. . -

There are longitudinal slots 16 in the movement of the slider and the shifting elements, the width of the slot part 17 corresponds to the width of the shifting element shoulder 12, the width of the slot part 18 corresponds to the width of the shoulder 13, and a step 19 is formed at their junction.

The order of determination of the rock strength in the massif in shear with compression is the following.

 A mining well 20 is drilled into the massif from the mining site, in which several sites are prepared for testing by creating a cylindrical bar 21 at both ends of each section with a larger diameter than the well. In this case, circular end pads 22 are formed at the ends of the section. Cylindrical grooves can be created with a special expander.

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ka (position III), the further movement of the slide and accordingly the shifting elements leads to a shift of the test area, the occurrence of which is judged by a decrease in the pressure of the working fluid in the hydraulic drive. The maximum value of this pressure P is considered the shear force, taking into account which, as well as the shear area, the shear strength is calculated.

To move the shifting elements from the working to the transport position, the thrust movement is reversed. Shifting the elements, resting against the back part of the end face of the cylindrical recess 21, fold and re-occupy the transport position I and hold the elastic ring 15 in this position. The device is ready for delivery along the well to another part of the rock mass.

2346252

or multiple processing of an array with a clicker. The housing GSO with the shifting elements 5, which are in the transport position, is fed 5 into the well so that the loading element 2 is precisely placed on the plot 23 to be tested. Then pump 4 pumps the working fluid into the loading element 2 to a pressure that provides required

loading 6 of the walls of the well in section 23, after which the hydraulic actuator is connected with the heavy 7 and abut against the wall of the working 24. After that, the source 15 9 pressure pumps the working fluid into the cavity of the hydraulic actuator 8, the ha 7 moves in the direction from the well, moving the slider 6 along body 1 in the same direction. Shifting position I, moving in this direction until their shoulders 12, sliding along the wide part 17 of the mounting slots 16, reach the ledge 19. With the subsequent movement of the slide 6 of the shifting element, the elements begin to rotate (position II) and perpendicular to the housing axis, with the shoulders 13 of the shifting elements being included in the narrow part 18 of the mounting slots 16. After the slide elements are flat supports 14 come into contact with a circular end plate 22 of the test area /: f f . .f. . -

ka (position III), the further movement of the slide and accordingly the shifting elements leads to a shift of the test area, the occurrence of which is judged by a decrease in the pressure of the working fluid in the hydraulic drive. The maximum value of this pressure P is considered the shear force, taking into account which, as well as the shear area, the shear strength is calculated.

To move the shifting elements from the working to the transport position, the thrust movement is reversed. Shifting the elements, resting against the back part of the end face of the cylindrical recess 21, fold and re-occupy the transport position I and hold the elastic ring 15 in this position. The device is ready for delivery along the well to another part of the rock mass.

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Editor E, Kopcha

Compiled by G. Alekseeva Tehred L. Serdyukova

Order 2963/41 Circulation 470 Subscription

VNIIPI USSR State Committee

inventions and discoveries 113035, Moscow, I-35j Raushsk nab ,, d, 4/5

Production and printing company, Uzhgorod Project Project, 4

Proof. With. Shekmar

Claims (1)

DEVICE FOR DETERMINING THE STRENGTH OF ROCKS IN ARRAY, comprising a housing with a movement mechanism located in it, made in the form of a coaxial body and mounted with the possibility of axial movement of a slider connected to a rod, with biasing elements and hydraulically connected hydraulically to a pressure source and a control measuring equipment, characterized in that, in order to increase accuracy by providing the ability to conduct shear tests with compression in the depth of the array and simplify the design of the section, it is equipped with a loading element, a centering tip, the body is made in the form of a pipe with longitudinal slots in the walls in the form of two sections of different widths, interconnected to form a step, the sliding elements are installed outside the body, spring-loaded and pivotally connected through the slots of the body with a slider, which is connected to the hydraulic drive by a thrust, the centering tip is mounted on the outer surface of the housing with an emphasis on the end opposite to the hydraulic drive, and the loading element is made in the form of an elastic a bolt rigidly mounted on the outer surface of the housing between the longitudinal slots and the hydraulic actuator, while a closed cavity is made between the outer surface of the housing and the inner surface of the elastic shell hydraulically connected to a pressure source and instrumentation, and the width of each of the shearing elements is made stepped in the form two sections corresponding to sections of longitudinal slots and conjugated with each other with the formation of GO GO 4 * Yu sl of the ledge. · 1234625 *