SU1188238A1 - Die for determining compressibility of frozen soil while thawing - Google Patents

Abstract

STAMP TO DETERMINE COMPRESSIBILITY FROZEN GROUND during thawing, including a housing with a lid, bottom and stiffening ribs with heating elements, characterized in that, with a view to spreading studies range, it is provided with a hollow glass, the vibrator and vibration detectors, the vibration sensors are arranged inside the hollow glass on the bottom of the case, and the vibrator is rigidly fixed on the case cover.

Description

ten

3 us-f 7 7

eleven

The invention relates to the construction, in particular to the study of the deformation properties of frozen soils during thawing under conditions of dynamic loading.

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

FIG. 1 shows the vibrostamp, general view; in fig. 2 - the same, top view.

The stamp includes a bottom perforated bottom 1, which serves to squeeze out the water appearing during the soil thawing process, the upper continuous bottom 2, the housing 3, the hollow cup 4 for accommodating vibration sensors 5, stiffening ribs 6, the cover 7 to which the vibrator 8 is rigidly attached designed to create dynamic effects on the thawable soil. Vibration sensors 5, which are used to register the magnitude of dynamic effects in order to exclude heat transfer from the vibrostamp to the vibration sensors, are mounted on a heat insulating base 9 fixed on the bottom 2.

For heating the die, eight heating elements 10 are used, which are attached to the plates 11 welded to the stiffening ribs 6. The compartments between the stiffening ribs are filled with dry quartz sand 12.

Three full metal tubes 13 are welded to determine the thawing depth using a metal probe in the center and along the edges of the vibrostamp. Static stress on the vibrostamps is created by the hydraulic house 82

Another (not shown). The pressure of the fluid is controlled by an exemplary meter, mounted 1 m directly into the working cylinder of the jack. In order to provide a central application of static load, the mat 7 is provided with a spherical hinge 14.

The stamp works as follows.

A gauze filter is placed on the leveled surface of the soil and a vibro-stamp is installed. After a static load is applied, it is produced on. heating the vibrostamp by the heating elements 10. The heating elements 10 are connected to the mains through a laboratory transformer, by means of which the consumed power is changed and the preset temperature of the vibrostamp bottom is maintained.

After the predetermined depth of thawing of the soil is reached, its deformations are measured (the measuring system is not shown), and then the vibrator 8 is turned on. The vibrator 8 creates constant harmonic oscillations with a predetermined frequency and amplitude of oscillations. Oscillations from the vibrator through the bottom of the vibrostamp are transmitted to the thawing soil array, causing additional soil deformations, which are recorded by type 6 PAO-LISI defibomers. The magnitude of the dynamic effect is fixed by three vibration sensors 5 oriented along three mutually perpendicular axes. The recording of oscillograms of oscillations is carried out using an oscilloscope H-117/1 installed in a warm trailer.

Claims (1)

A DAMP FOR DETERMINING THE COMPRESSIBILITY OF FROZEN SOILS DURING THAWING, including a housing with a cover, bottom and stiffeners with heating elements, characterized in that, in order to expand the range of studies, it is equipped with a hollow glass, a vibrator and vibration sensors, while the vibration sensors are placed inside the hollow glass on the bottom of the case, and the vibrator is rigidly fixed to the cover of the case. 3 Fig. 1