SU709997A2 - Soil investigating device - Google Patents

Description

one

The invention relates to the field of construction, in particular for the study of soil by the method of rotational, slice in the production of engineering-geological research.

A device according to the main auth. No. 482673, including the main impeller, coaxially located additional kyltera and carrying rod. The disadvantage of the device is that it allows the anisotropy coefficient to be determined only in the strike cross.

The aim of the invention is to expand the field of research.

This is achieved by the fact that in the device for the study of soil by the method of rotational slice according to the author. swith No. 482673 additional impeller is made with a trapezoidal shape.

FIG. 1 shows a general view of the device; in fig. 2 shows section A-A in FIG. one; in fig. 3 - section bb FIG. one.

A device for investigating soil anisotropy by the rotational slice method consists of impeller 1, carrying rod 2 and additional impeller 3 with trapezoidal blades. A connecting link 4 is mounted between the impellers 1 and 3, which includes the hub 5 of the impeller 1. The supporting rod 2 is equipped with a tooth 6, and the impeller 3 has a hub 7. The hubs 5 and 7 of the impellers 1 and 3 have slots 8 corresponding to the tooth 6.

The device works as follows. After installation of the device to the required depth by the pressure transmitted from the surface to the carrier rod 2, the impeller 1 starts working. This happens when the carrier rod 2 rotates 5 and when the tooth 6 enters the groove 8 of the impeller hub 5 1. Further, when the carrier bar moves up 2 tooth 6 enters the groove 8 of the hub 7 of the impeller 3, and it

0 is enabled. The connecting link 4 has the ability to shift vertically by an amount a, which is what ensures the separate operation of the impellers 1 and 3. The measurements of the steepness of the 5 torques remain normal.

The research methodology is as follows. Initially, a device of 30 autom. St. No. 482673. The aniootropy coefficient across the soil strike Kg o is determined by the formula:

;., - oh, (W

To qo °

(one)

Then, the meaweed with rectangular blades is replaced with trapezoidal impeller blades and the device is inserted into the ground. After testing, the soil anisotropy coefficient at an angle of the OSK is determined from the expression:

d.-c.

(2)

TO

t 2,4Nv, 2; M

de

2.4A, 2 .-- 1.4-IV

(3)

 -14)

 .. i

(five)

(L-

 L .. d

(..four-)

SKP (6)

shear resistance along the ground strike;

resistance to shear across the ground;

 soil shear resistance

at an angle cc to strike; static torque

impeller 1;

 torque obtained when the main impeller 1 rotates into the ground; M is the torque obtained by rotating the additional rectangular horn head 3 in the ground;

M, the torque obtained by rotating in the ground an additional impeller 3 with trapezoidal blades. The device allows to obtain more reliable information about the resistance of the soil to shear and to take into account the anisotropy of the strength of the soil along the potentially dangerous slip curve when calculating the stability of the foundations of structures and slopes.

Claims (1)

Invention Formula A device for exploring the soil by the method of rotational slice according to the author. swith No. 482673, characterized in that, in order to expand the area of study, the additional impeller is made with a trapezoidal blade.