Frozen clay hollow cylinder sample preparation device

A hollow cylindrical sample and clay technology, which is applied in the field of frozen clay hollow cylindrical sample sample preparation device, can solve the problems such as incomplete distribution of moisture, inability to perform mechanical tests, uneven frost heave deformation, etc. The effect of easy mold and small initial damage

Active Publication Date: 2015-12-23
NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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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 hig

Method used

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  • Frozen clay hollow cylinder sample preparation device
  • Frozen clay hollow cylinder sample preparation device
  • Frozen clay hollow cylinder sample preparation device

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Embodiment Construction

[0017] Below, in conjunction with accompanying drawing, the technical scheme of invention is described in further detail by embodiment:

[0018] Such as Figure 1-Figure 5 As shown, a hollow cylinder sample preparation device for clay is composed of a booster rod 1, a stainless steel three-lobed outer cylinder 2, an inner cylinder cap 3, a tight hoop 4, a toothed upper pressure head 5, a fixing screw 6, Pumping plate 7, stainless steel double-valve inner cylinder 8, hoop ring 9 with hanging ears, hollow cylindrical sample 10, toothed lower pressure head 11, bolt 12 for fixing bracket, bracket 13, and lower base 14 constitute. The booster rod 1 is connected with the cylindrical indenter of the testing machine, and its function is to transmit the pressure to the toothed upper indenter 5, the upper indenter 5 is fastened to the top of the hollow cylindrical sample 10, and the lower indenter 11 is placed At the bottom of 10 of the hollow cylindrical sample. There are two main fu...

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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...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 王大雁郭妍马巍王永涛穆彦虎雷乐乐
Owner NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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