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Unsaturated bentonite corrosion test system and method in multi-field coupling environment

A test system and bentonite technology, applied in the field of geotechnical test equipment, can solve the problems of lack of proof of corrosion test and high requirements, and achieve the effect of widening the scope of application, stabilizing water flow, and reducing the influence of human operation.

Active Publication Date: 2021-11-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The research on the dissolution behavior of unsaturated bentonite has high requirements for test equipment and test technology. The current research results are mostly focused on theoretical exploration, lacking dissolution test evidence. my country's research on the dissolution behavior of unsaturated bentonite is still in its infancy. Multi-field coupling The lower unsaturated bentonite dissolution test and related test equipment are not involved

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  • Unsaturated bentonite corrosion test system and method in multi-field coupling environment

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Embodiment Construction

[0056] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] In the deep geological repository of high-level radioactive waste, the bentonite buffer / backfill layer is subject to the coupling effects of temperature field, humidity field, chemical field and stress field, such as figure 1 shown. The surface of the bentonite is in contact with groundwater, and the groundwater slowly soaks into the bentonite cushion; the interior of the bentonite is in an unsaturated state, and under the action of the groundwater solution, a saturation gradient is formed from the surface of the bentonite to the interior of the bentonite. During the tens of thousands of years of operation of the repository, the gases (methane, hydrogen, carbon dioxide, etc.) The constant climb endangers the safety of the repository. Real-time testing of the microscopic evolution and macroscopic response of unsaturated bentonite diss...

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Abstract

The invention relates to an unsaturated bentonite corrosion test system and method in a multi-field coupling environment. The system comprises a multi-field sensing control triaxial corrosion device, a strain servo shaft stress loading unit, a temperature control gas phase control unit, a temperature control speed control liquid phase seepage control unit and a corrosion whole process real-time monitoring unit. Compared with the prior art, the corrosion behavior and development process of the unsaturated bentonite can be intuitively monitored and measured in real time, and the corrosion rule of the unsaturated bentonite in complex chemical, stress and temperature fields can be accurately obtained; an aqueous solution pressure and a gas pressure are respectively applied and controlled from the outside and the inside of a compacted bentonite sample in a triaxial corrosion chamber, and a temperature field similar to a high-level radioactive waste deep geological repository environment is applied in the sample, so that the influence of a multi-field coupling effect of the high-level radioactive waste deep geological repository environment on unsaturated bentonite corrosion is simulated; and the corrosion behavior and rule of unsaturated bentonite in a high-level radioactive waste deep geological repository environment are truly simulated.

Description

technical field [0001] The invention belongs to geotechnical test equipment, and relates to an unsaturated bentonite corrosion test system in a multi-field coupling environment, in particular to a complex coupling of heat-water-force-chemical-gas multi-fields, which can control the size of different action fields and simulate real Dissolution test system and method for bentonite buffer layer of nuclear waste repository eroded by pore water. Background technique [0002] The utilization and development of nuclear power has effectively alleviated the huge pressure of energy shortage in the economically developed eastern regions of my country, and the disposal of a large amount of high-level radioactive waste generated by nuclear power plants is a huge challenge facing the world (Wang Ju et al., 2018). At present, the feasible solution recognized by the international community is to bury the high-level radioactive waste in a stable and solid rock formation at a depth of 500-100...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N1/28G01D21/02
CPCG01N17/00G01N1/28G01D21/02
Inventor 徐永福郑新江李晓月
Owner SHANGHAI JIAO TONG UNIV
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