SU481670A1 - Compression Tester - Google Patents

Description

I The invention relates to devices for studying the physicomechanical properties of materials, for example, soils.

A known device for compression tests, such as soils, includes a container for the material under study, a loading device and a strain gauge.

However, testing of soil samples on these devices requires a long time, and the accuracy and reliability of the research results is insufficient, since the device designs limit the height of the samples under study and do not allow for the effect of the friction force of the sample on the lateral surface of the tank.

The purpose of the invention is to improve the accuracy of gfi testing of weak water-saturated soils.

Permanent goal is achieved by the fact that the container is made both} F and 14 is limited to the movable perforated liners concluded between the hinge i supports, the bottom of which is set to 1 on the dynamometer device.

The drawing shows the proposed. (Compression device.

The perforated container 1 in the sleeves 2 and 3 is bounded by movable perforated liners 4 and 5, which is enclosed between the pivot bearings 6, the bottom of which is mounted on the torque tool 7.

On the frame of the device installed load device 8, made in the form of a screw press, mounted on racks 9, and strain gauge 1O. Clips 11 and 12 allow the container to be held stationary relative to the sample.

The principle of operation of the device is as follows.

The load device through the movable liners of the sample is deformed in a perforated container by a certain value, fixed by the strain gauge.

In this case, the container is fixedly held on the frame by clips 12 with the clamps 11 released and the upper and lower liners moving. i After the end of the deformation process, the load device waits for the moment of conditional voltage stabilization in the abrasive and the spring of the dynamometer. The value of the stabilized load corresponding to the load on the lower end of the specimen is recorded from the dynamometer indicator. To measure the amount of stabilized load on the upper end of the Maiim clamp sample, rigidly connect the lower pads (punch) with the perforated container in order to avoid deformation of the lower end of the tube with a dynamometer, and the clamps 12 are released, allowing the container to be kept under load with the sample. After that, the load value | ia the upper end of the sample is removed from the indicator of the dynamometer. From the obtained values of the strain of the sample at the upper and lower ends of the sample, the compressibility parameters are calculated taking into account the friction losses of the sample along the walls of the persisted capacitance. PREPARATION OF ACQUISITION A device for compression tests, for example, of soils, including a container for the material under study, a loading device and a strain gauge, which is characterized by the fact that the container is made perforated and orpaHipchen to improve the measurement accuracy movable perforated inserts enclosed between the pivot bearings, the bottom of which is mounted on a torque tool.