Frozen soil true triaxial rigid loading mold based on temperature gradient and operation method

Abstract

The invention discloses a frozen soil true triaxial rigid loading mold based on temperature gradient and an operation method. The frozen soil true triaxial rigid loading mold is composed of a cold liquid circulating inlet pipe, a cold liquid circulating pipe, a rigid loading plate, a rigid heat insulation plate, a cold liquid circulating return pipe and a temperature sensor. The cold liquid circulating pipe is located in the rigid loading plate, and the rigid loading plate is nested in the rigid heat insulation plate; the mold is installed and externally connected with a cold source circulating system and a temperature control system, research on the physical and mechanical characteristics of frozen soil under a complex stress path and a specific temperature gradient can be achieved, and the device has the advantages of being simple in structure, convenient to operate and the like.

Description

technical field [0001] The invention relates to a mold for performing a temperature gradient test on frozen soil, in particular to a true triaxial rigid loading mold for frozen soil based on a temperature gradient and an operation method. Background technique [0002] Under the comprehensive action of frost heaving force, initial ground stress and total mutual force between frozen soil and structures, frozen soil is in a three-dimensional stress state. At present, the research on the strength and deformation characteristics of frozen soil under complex stress state mostly relies on the conventional triaxial test system. However, this system can only apply axial and circumferential stress, so that the frozen soil is in an axisymmetric stress state, ignoring the influence of the intermediate principal stress, and cannot truly reflect the actual stress state of the frozen soil. Simultaneously affected by formation temperature, atmospheric temperature, refrigerant temperature a...

AI Technical Summary

Problems solved by technology

In the above invention, only a uniform temperature field can be provided, and the temperature gradient cannot be realized

[0006] (2) Chinese invention, CN107576562A / a multi-field coupled true triaxial test system and its test method, the invention's major principal stress and middle principal stress directions are rigid loading, and the small principal stress is flexible loading, which can carry out complex temperature field true triaxial test on frozen soil, but the three principal stress directions are fixed, and the special stress path loaded in the small principal stress direction cannot be realized (Zhang Kunyong et al., True triaxial test of gravel-mixed clay under the condition of small principal stress direction loading, Rock and Soil Mechanics, 2018,39(9):3270-3276)

[0007] (3) Chinese invention, Chinese invention authorization, CN103364266B / a two-dimensional temperature gradient frozen soil test device and its method, this invention can only realize the temperature gradient under the axisymmetric stress state, and cannot consider the influence of the middle principal stress

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