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Unsaturated Soil Frost Heave Apparatus and Frost Heave Test Method with Multiple Loading Modes

A test method and technology of frost heave, applied in the field of geotechnical engineering, can solve problems such as unsatisfactory scientific research, inability to eliminate pressure on the top of soil samples, inability to eliminate pressure, etc.

Active Publication Date: 2021-04-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A variety of frost heave instruments have been released at home and abroad, but none of them can realize the supply of gaseous water, and at the same time, the pressure on the top of the soil sample cannot be eliminated (provided by the temperature plate and the self-weight of the freezing liquid, and the friction between the temperature plate and the sample cylinder)
Frost heave instruments that cannot realize gaseous water recharge cannot be used to study the frost heave characteristics of subgrade fillings such as unsaturated coarse-grained soils
The pressure on the top of the soil sample cannot be eliminated, and the measured frost heave has a large error, which can no longer meet the higher requirements of scientific research at this stage

Method used

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  • Unsaturated Soil Frost Heave Apparatus and Frost Heave Test Method with Multiple Loading Modes
  • Unsaturated Soil Frost Heave Apparatus and Frost Heave Test Method with Multiple Loading Modes
  • Unsaturated Soil Frost Heave Apparatus and Frost Heave Test Method with Multiple Loading Modes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preferred embodiment one, such as figure 1 As shown, the unsaturated soil frost heave instrument disclosed in this embodiment is suitable for carrying out unsaturated soil negative dynamic and static load frost heave tests, and it includes a sample storage system 1, a load control system 2, a humidity control system 3, Temperature control system 4 and constant temperature box 5.

[0048] Such as figure 2As shown, the sample storage system 1 includes a sample cylinder 11 , a temperature plate 12 , a base 13 , a positioning cylinder 14 and an insulation cylinder 15 . The sample cylinder 11 is a cylinder with openings at both ends, made of plexiglass material, and holes are punched on the cylinder wall according to the target requirements, and a temperature sensor 16 and a stress sensor 17 are embedded in the sample soil in the cylinder. The temperature sensor 16 adopts The thermal resistance is used to measure the soil temperature of the sample soil, and the stress sen...

Embodiment 2

[0066] Preferred embodiment two, such as Figure 6 As shown, the difference between this embodiment and the preferred embodiment 1 is that the load control mechanism in this implementation is selected as the zero load control mechanism 7 . Zero-load control mechanism 7 comprises reel 71, slide rope 72 and pulley 73; During assembly, reel is connected in reaction force frame 21, and pulley is connected under beam 211, and one end of slide rope is wound on the reel, and the other end is wound around. After passing through the pulley, it is connected to the temperature plate 12; at the beginning of the test, the reel rotates and lifts the temperature plate through the zip line so that the load on the sample soil is zero; The signal transmitted by the pressure sensor between the plate and the sample controls the lifting of the slide cable to ensure that the overlying load of the sample is always zero throughout the test process.

[0067] This preferred embodiment is suitable for ...

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Abstract

The invention discloses a multi-loading mode unsaturated soil frost heaving instrument and a method for testing the amount of frost heaving. The frost heaving instrument includes a sample storage system, a load control system, a humidity control system, a temperature control system and a constant temperature box; the sample storage The system includes a sample cylinder and a temperature plate, the bottom of the sample cylinder is provided with an air inlet, the temperature plate is provided with a cavity, the bottom of the cavity is equipped with a water and air barrier film, and the top of the cavity is provided with a liquid inlet and a liquid outlet , the temperature plate is set in the top of the sample tube, and the sample tube is placed in the constant temperature box; the load control system includes a reaction force frame and a load control mechanism, the load control mechanism is set in the reaction force frame, and the reaction force frame stands in the constant temperature box Inside, the load control mechanism is set in the reaction frame and connected with the temperature plate; the humidity control system is connected with the air inlet of the sample cylinder; the output port of the temperature control system is connected with the liquid inlet on the temperature plate, and the outlet is connected with the temperature plate. The liquid outlet is connected. Frost heave tests in multiple loading modes can be carried out, and gaseous water recharge can also be realized to induce frost heave of coarse-grained soil.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to a multi-loading mode unsaturated soil frost heave meter and a test method for frost heave. Background technique [0002] Subgrade frost heaving is the main disease of engineering in cold regions, especially for highways and high-speed railways in cold regions. Experimental simulation is an important means to study the frost heave performance of subgrade filler. When the ambient temperature in the cold area reaches negative temperature, the temperature of the pore water in the soil reaches the freezing point and freezes. The frost heave of the subgrade requires water supply. The latest research results show that the migration of gaseous water is the core factor that induces frost heave of unsaturated coarse-grained soil and other rock materials. For example, unsaturated coarse-grained soil filler is the main material of high-speed railway foundation, but in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/14
CPCG01N25/14G01N25/145
Inventor 滕继东刘建龙张升盛岱超
Owner CENT SOUTH UNIV
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