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Temperature control three-axis system capable of accurately measuring unsaturated soil deformation rule

A technology of precise measurement and temperature control system, applied in the direction of applying stable tension/pressure to test the strength of materials, and can solve problems such as monitoring of small strain modulus of soil samples.

Inactive Publication Date: 2017-04-26
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the system cannot monitor small strain moduli of soil samples

Method used

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  • Temperature control three-axis system capable of accurately measuring unsaturated soil deformation rule
  • Temperature control three-axis system capable of accurately measuring unsaturated soil deformation rule
  • Temperature control three-axis system capable of accurately measuring unsaturated soil deformation rule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 with 2 As shown, a temperature-controlled three-axis system that can accurately measure the deformation law of unsaturated soils is characterized by including an inner pressure chamber and an outer pressure chamber, the inner pressure chamber is placed in the outer pressure chamber, supported by a base, and:

[0043] (1) Temperature control system;

[0044] (2) Suction and stress control system: It is mainly composed of connecting air pressure controller, vertical loading shaft and bore air pressure pipeline. The opening on the top of the outer pressure chamber is provided with an air pressure controller; the vertical loading shaft penetrates the inner and outer pressure chambers vertically, and is connected to the pressure dial gauge at the top; the base is also provided with a hole air pressure pipeline; the air pressure controller, Confining pressure, axial pressure and pore water pressure are applied to the vertical loading shaft and pore air pressure pi...

Embodiment 2

[0054] The method of using the system of Example 1 includes:

[0055] Before the test, saturate the clay plate with high air intake value, then place the prepared sample on the saturated clay plate, install the bending-extension element, and place filter paper, permeable stone and sample cap on the sample in turn; after placing , Wrapped with a double-layer rubber film with a thin foil in the middle;

[0056] After that, install the inner pressure chamber, reference tube and thermocouple, inject airless water into the inner pressure chamber and reference tube to the appropriate position, and then install the spiral copper tube and the outer pressure chamber. The spiral copper tube needs to be in the temperature control system. The water bath is connected by a water pipeline, and the outer pressure chamber must be filled with water to an appropriate position. The outer pressure chamber and the water pipeline need to be wrapped with insulation materials.

[0057] A further preferred e...

Embodiment 3

[0061] Test purpose: to measure the volume change of remolded loess and undisturbed loess during temperature cycling under different suction conditions.

[0062] Test procedure: The first step is to apply a 50kPa confining pressure and reach a steady state; the second step is to apply a target suction of 100 and 0kPa and reach a suction equilibrium state; the third step is to change the temperature, 23-33-43-50- 43-33-23-13-5-13-23℃, each temperature load lasts 24h.

[0063] The test soil sample is Shaanxi Xi’an loess with a relative density of 2.69, containing 0.1% sandy soil, 71.9% silt soil, and 28.0% clay. The liquid limit is 36%, the plastic limit is 19%, and the plasticity index is 17. According to the unified soil classification, it is classified as low plastic clay. The height of the soil sample is 20mm, the diameter is 76mm, the initial porosity is 1.18, and the initial suction value is about 200kPa.

[0064] The test results are as image 3 Shown. During the heating pro...

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Abstract

The invention provides a temperature control three-axis system capable of accurately measuring an unsaturated soil deformation rule. The temperature control three-axis system is mainly used for testing a deformation rule of saturated soil and unsaturated soil under the action of cycling stress-seepage-temperature and under different state conditions and belongs to the field of environment geotechnical and energy source geotechnical engineering. The temperature control unsaturated soil three-axis system is mainly composed of five parts including a temperature control system, a suction and stress control system, a double-pressure-room volume measuring system, a soil body small strain modulus measuring system, a washing system and the like. By adopting the measuring system provided by the invention, soil body deformation rule measurement of different strain ranges (wherein, extremely small strain is smaller than 0.001%, small strain is equal to 0.001%-1% and large strain is more than 1%), accurate and stable control of a large-range temperature (from 5 DEG C to 90 DEG C), and control of soil body pressure and suction are realized.

Description

[0001] Technical field: [0002] The invention belongs to the field of environmental geotechnical and energy geotechnical engineering, and specifically relates to a temperature control triaxial system that can accurately measure the deformation law of unsaturated soils, and is mainly used to test different stress states in environmental geotechnical and energy geotechnical engineering. An experimental study on the deformation law of unsaturated soil under the condition of cooling and heating cycles. [0003] Background technique: [0004] In recent years, due to the requirements of sustainable development for environmental protection and energy utilization, environmental geotechnical and energy geotechnical engineering has received increasing attention and developed rapidly, such as landfill overburden and anti-seepage system, energy pile engineering, etc. These environmental geotechnical and energy geotechnical engineering all involve the measurement of the deformation law of unsatu...

Claims

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Application Information

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IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 周超吴宏伟程青
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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