SU939637A1 - Apparatus for investigating soil properties - Google Patents

Description

The invention relates to engineering geology and can be used to simulate the natural conditions of the ground.

A device for investigating soil properties is known, including a die connected to a loading device d.

The disadvantage of this device lies in the inability to simulate the conditions of the ground at different depths.

Closest to the present invention is a device for investigating soil properties, including a housing, a chamber for soil, a loading device connected to a punch, a mechanism for compacting soil and measuring device 2,

A disadvantage of the known device is that it is not used to investigate the influence of gravitational fields on the strength of soils. .

The purpose of the invention is to expand the scope.

The goal is achieved by the fact that the device for research, the properties of the soil, including the housing, the chamber for soil, the load device connected to the die, the mechanism for soil compaction and the measuring device, is equipped with an additional annular chamber for soil, the mechanism for soil compaction is made the form of a centrifugal installation, the load device in the form of an electromagnetic coil with a crust and a drummer,

10 a device in the form of three cylindrical metal plates, forming capacitive electric elements, two plates being installed along the walls of chambers for soil,

15 and a third - on the drummer.

Figure 1 shows the proposed device, a General view; 2 is a circuit diagram of a measuring device penetrating a 20 meter; FIG. 3 is a circuit for switching on and off a direct current electromagnet.

The device consists of a housing 1 with a glass 2 made of a dielectric, inside of which are the plates 3 and 4 of a cylindrical capacitive element, forming a co-capacitor with an electrical capacitance CA. in turn lining 4 together

Claims (2)

30 with the lining 5, pressed on the lateral surface of the striker 6, forms a capacitor with an electrical capacitor CB. The drummer b through the bore 7 is kept in its original state by a direct current electromagnet 8. The lower part of the drummer b is a stamp 9. The lining 3 is put on the cup 10 with the pressure, the lining 4 is pressed into the cylinder 11, which together with the cup 10 represents a support for the lid 12, pressed against the lid 13. The inner chamber is a cup 14, closed with a kick 15. The soil 16 under investigation is simultaneously in the inner cylindrical and outer annular chambers. The plates 4 and 5 are separated with a mica insulator 17. The plates 3 and 4 have access to the measuring bridge AC-P-5004 through screws 18 and 19. The plates 4 and 5 have access to the second measuring bridge through screws 20 and 19. Frame The coils of the electromagnet of the current 8 are attached to the bottom of the cover 21. The flange 22 is attached to the cover 23, onto which the cover 24 is screwed, protecting the leads of the plates, as well as the power supply terminals 25 to the coil of the electromagnet. The device works as follows. When the centrifugal unit (not shown) is turned on, the body 1 begins to rotate, and the soil placed in the inner chamber 14 and the outer ring of the ninth chamber under the impact of the centrifugal forces begins to compact, and the density of the soil p is determined from the measurement of Cd - electric capacitor capacitor according to the formula. , 14l () to, a4 (6o-ii) b-CAi o.2; 41 e elicCTv -D) where yri is the mass of the material under study 6 (3 is the dielectric constant of air; §4 is the dielectric constant of the material under study i - the length of the soil chamber; 33. - the outer diameter of the inner capacitor plate; Dj - the inner diameter of the outer capacitor plate. ground is determined by the depth Other implementation of the stamp 9 in the soil under study and, consequently, the measured capacitance capacitance. The scales of the measuring bridges of capacitors Cd and Cg are graduated, respectively, in units of density and strength. After loading the test soil into the device, the coil K is energized, resulting in the firing pin 6 is in the tightened position, and the stamp 9 is at the level of the soil being investigated 16. Pressing the Start button (Fig. 2) energizes the coil of the relay P, which, having closed its contacts, yuchaet to measuring bridges P-5004 capacitive measuring electrode element. The initial reading of the bridges P-5004 is taken as zero. After turning on the centrifugal unit according to the indications of a bridge connected to the capacitor Cd, ensuring the achievement of the required density of the soil being studied, the key K (Fig. 3) of the power supply circuit of the electromagnet 8 is penetrated and the hammer punch penetrates the soil under study. With the bridge connected to the Cg capacitor, the strength of the soil being investigated is measured depending on the various values of the gravitational fields. The invention The device for the study of soil properties, including a housing, a chamber for soil, a load device connected to a punch, a mechanism for soil compaction and a measuring device, which in order to expand the field of application, it is equipped with an annular chamber for soil, a mechanism for soil compaction made in the form of a centrifugal installation, a load device - in the form of an electromagnetic coil with a bark and a drummer, and a measuring device - in the form of ex cylindrical metal electrodes forming the capacitive electrical elements, and two electrodes mounted on the wall of the chamber for the ground, and the third - the hammer. Sources of information taken into account in the examination 1.Cherkasov I.I. and others. Soil of the Moon. M., Science, 1975, p. 33-36, 49-50. 2. Authors certificate of the USSR 633977, cl. E 02 B 1/00, 1977.