Frozen clay hollow cylinder sample preparation device

Abstract

The invention relates to a frozen clay hollow cylinder sample preparation device. The device has the structural characteristics that a tooth-shaped upper pressure head and a lower pressure head are clamped between an inner cylinder and an outer cylinder in butt joint, are located at the upper end and lower end of a hollow cylinder sample, the outer cylinder is fixed by tightening rings, and a force application rod is right above the toothed upper pressure head, is connected to the pressure head of a sample presser and is responsible for transferring pressure evenly to the toothed upper pressure head. The middle part of the outer cylinder is an ear equipped tightening ring, which is in connection with a stainless steel bracket. The sample preparation method includes: firstly fixing the whole device well, introducing uniformly stirred wet clay into a sample preparation barrel in layers, and performing both-end compaction on the clay body with the sample presser. The device provided by the invention has the advantages of simple operation, time saving and simple principle, can prepare saturated hollow cylindrical clay samples characterized by uniform dry density and moisture content distribution, small initial damage, and tooth-shaped upper surface and lower surface, and provides technical support for further study of the mechanical properties of frozen clay under complex 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 of...

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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