Frozen Clay Hollow Cylindrical Sample Preparation Device

Abstract

The invention relates to a sample preparation device for a frozen clay hollow cylinder sample. Its structural feature is that tooth-shaped upper and lower pressure heads are stuck between the docking inner cylinder and the outer cylinder, and are located at the upper and lower ends of the hollow cylinder sample, and the outer cylinder uses a tight hoop. It is fixed by a ring, and directly above the toothed upper pressure head is a booster rod, which connects with the pressure head of the sample press and is responsible for uniformly transmitting the pressure to the toothed upper pressure head. The middle part of the outer cylinder is a hoop with ears, which is connected with a stainless steel bracket. The sample preparation method is firstly to fix the whole device, then introduce the uniformly stirred wet soil into the sample preparation cylinder in layers, and use the sample press to compact the soil at both ends. The invention is not only easy to operate, saves time, and has a simple principle, but also can make a saturated hollow cylindrical clay sample with uniform dry density and moisture content, small initial damage, and tooth-shaped upper and lower surfaces. Provide technical support for mechanical properties under stress path conditions.

Description

technical field [0001] The invention relates to a sample preparation device for a frozen clay hollow cylinder sample. Using this device, saturated clay hollow samples can be prepared to provide technical support for further research on the mechanical properties of frozen clay under complex stress path conditions. Background technique [0002] Hollow cylinder test is an ideal support method to study the mechanical properties of soil under the condition of complex stress path. The hollow cylinder test has always been the bottleneck restricting our further understanding of the mechanical properties of frozen soil due to the limitation of the temperature control technology of the pressure chamber and the sample preparation technology of the hollow cylindrical frozen soil sample. At present, there is no research on the mechanical properties of frozen soil through hollow cylinder test in the field of frozen soil mechanics. In the study of unfrozen soil, the soil samples are ofte...

AI Technical Summary

Problems solved by technology

However, for clay with relatively fine particles, due to its poor permeability, back pressure saturation is very difficult. Even if the soil sample is subjected to back pressure saturation under high pressure, the water cannot be completely distributed evenly in the soil sample. After the sample is frozen, it will produce uneven frost heave deformation and cannot be used for mechanical tests.

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