SU1330504A1 - Stability meter - Google Patents

Abstract

The invention relates to the field of investigation of the strength and deformation properties of rocky soils in a bulk stress state (5, Gj G. The aim of the invention is to improve accuracy and reduce labor costs. The stabilometer includes a housing 1 with a fluid chamber 2 and a plastic sheath 3, accessories dp creating vertical and radial loads. The housing 1 is equipped with an additional chamber 10, combined with the liquid chamber 2. The additional chamber has concentrically placed different liquids supported by one ends in the piston 11, and others in the corresponding annular stops, placed inside the additional chamber 10. 2 Il. (L t

Description

11330504

The invention relates to the study of the strength and deformation properties of rocky soils in a bulk stress state of the form G, 6.

The aim of the invention is to increase accuracy and reduce labor costs.

1 shows a stabilometer, a general view; in fig. 2 - additional camera, vertical section.

The stabilometer includes a housing 1 in which a cylindrical liquid chamber 2 is placed. with elastic reformation for rocky soils, usually C 5.0-50.0 MPa.

The stabilometer works as follows.

The prepared cylindrical sample with glued on its surface sensors 4 vertical and radial deformations are placed inside the liquid chamber 2. The sample is placed between the rods 6 of the vertical load. The working fluid is supplied to the cylindrical chamber 2 by a valve 7 of radial load. Dump fan 3 for soil sample. On the turn 15, the 8 is muffled. Sensors 4 are glued in an additional soil cavity, upper upper spring is attached to the upper casing 2, caps 5 are inserted through which 12. In the liquid chamber 2 they create

rods 6 devices for creating a vertical load (punches) pass. - The stabilometer also includes valves 7 and 8 for feeding and discharging the working fluid into the cylindrical chamber, a pressure gauge 9 for controlling the radial load, and an additional chamber 10 for adjusting the stiffness of the cylindrical liquid chamber 2. Additional chamber 10 contains a piston 11, upper, middle and lower springs 12, 13 and 14 of different stiffness, upper, middle and lower annular stops 15, 16 and 17, placed inside the additional chamber 10. In this case, the springs 12, 13 and 14 are concentrically mounted in each other. The upper spring 12 is supported at one end on the piston P, and on the other end on the upper contact stop 13. The average spring 13 is at one end supported on the piston 11, and the other on the central annular stop 16, the lower spring I4 at one end is supported on the piston 11, and the other - on the lower annular stop 17 An additional chamber 10 is mounted in the housing 1 and combined with a cylindrical liquid chamber.

The stiffness of the springs for each experiment is determined by the formula

R,

h de h - spring stroke, mm;

R., (1)

R.- (1-), S 0.05-0.25;

Р7

 Maximum spring force, kg;

p (3-) g

d - diameter is equal to the diameter of the rod - punch, mm;

(Tj - voltage is taken in, depending on the experiment program for rocky soils, usually C 5.0-50.0 MPa.

The stabilometer works as follows.

The prepared cylindrical sample with glued on its surface sensors 4 vertical and radial deformations are placed inside the liquid chamber 2. The sample is placed between the rods 6 of the vertical load. In a cylindrical chamber 2 valve 7 radial load delivers0

0

Q

five

the required pressure P, after which the sample through the rods 6 is loaded with a vertical load.

The valve 8 loads close. The radial load is monitored by a pressure gauge 9. The deformation of the test specimen is measured by sensors 4. A sequential installation in the process of loading springs 12, 13 and 14 into the additional chamber 10 corresponds in kind to three states in which the volume of rock soil in series loading process.

In the first stage of deformation under load, the closing of existing cracks and pores in the rocky soil occurs, at which time the stiffness of the upper spring 12 corresponds to the stiffness of the surrounding rocky soil and is determined by the formula (1), moreover

Ci

where J is the volume weight of the rocky ground;

i J (coefficient

I -N

Punch) 0,25; h is the distance under consideration

zones from the surface of the massif, m. The transition of the considered volume of rocky soil to the second and third stages of deformation is determined in the course of the experiment according to the resulting diagram b ,. f (g) which is depicted during the experiment. The second stage is characterized by a relatively linear form of the function C5j f (f). At this stage, without stopping the loading process, an average spring 13 is installed in the secondary chamber, whose rigidity is determined by formula (1), in which instead of

0

five

G is put, which results from an increase in the effect of the loading volume when closing existing cracks.

The third stage of the experiment corresponds to the stage of destruction of the studied volume of rocky soil. At this stage, a macro-crack forms in the test volume, which splits it. The stiffness of the lower spring 14 is determined by the formula (1) at the rate of 3 - G

L 8

what follows from the increase in mas15

headquarters cracks in the destruction of the test volume of rock.

Claims (1)

Formula of the invention A stabilometer comprising a housing, a cylindrical liquid-JQ cylindrical liquid chamber accommodated therein. bone chamber with an elastic sheath for a soil sample, devices for creating vertical and radial loads on the sample, measuring devices, characterized in that, in order to increase accuracy and reduce labor costs during testing, it is equipped with an additional chamber containing a piston, upper, middle , and the lower springs of different stiffness and the upper, middle and lower annular abutments located inside it, while the springs are concentrically placed in each other, one end supported on the piston, and the other on the corresponding supported stops and mounted additional chamber in the housing and communicated bone chamber with an elastic sheath for a soil sample, devices for creating vertical and radial loads on the sample, measuring devices, characterized in that, in order to increase accuracy and reduce labor costs during testing, it is equipped with an additional chamber containing a piston, upper, middle , and the lower springs of different stiffness and the upper, middle and lower annular abutments located inside it, while the springs are concentrically placed in each other, one end supported on the piston, and the other on the corresponding There is a cylindrical fluid chamber. the main supports are mounted additional chamber in the housing and communicated duiz.2 Compiler L.Tronina Editor L.Povkhan Tehred I.Popovich Proofreader S, Cherni Order 3574/44 Circulation 776 Subscription VN11IPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4.