Method for realizing three-dimensional space stress or strain path by using conventional triaxial apparatus

Abstract

The invention discloses a method for realizing a three-dimensional space stress or strain path by using a conventional triaxial apparatus. The method comprises the following steps: determining loading paths of a test scheme in a three-dimensional main stress and main strain space and a generalized stress and strain space under a true triaxial condition; deducing loading paths of a true triaxial apparatus and a conventional triaxial apparatus in generalized stress and strain space; and controlling the loading mode of the conventional triaxial apparatus, so that the loading path of the conventional triaxial apparatus is consistent with the loading path of the true triaxial apparatus in the generalized stress and strain space. The true triaxial apparatus has the beneficial effects that the thought constraint that a conventional triaxial apparatus can only research a two-dimensional space stress path in a traditional concept is broken through, the stress path and the strain path of a three-dimensional space are researched by utilizing the conventional triaxial apparatus, and partial functions of the true triaxial apparatus are realized.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a method for realizing a three-dimensional stress or strain path by using a conventional triaxial instrument. Background technique [0002] Conventional triaxial experiments have been used by researchers to explore the mechanical properties and engineering properties of soil. However, conventional triaxial experiments can only apply stress in two independent directions to the soil, and cannot change the central principal stress alone. The force is in an axisymmetric state, so it can only reflect the force characteristics under the axisymmetric stress state, and the force characteristics under the three-dimensional stress state cannot be represented. Since 1936, Kjellman first designed a true triaxial tester with six rigid plates controlled independently, and studied the shear strength change of sand under complex stress state, which has attracted widespread attention of sc...

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Problems solved by technology

[0003] Although the development of the true triaxial test enables the true triaxial test to better study the mechanical properties and stability of the soil under complex stress states, there are still temporarily insurmountable difficulties, such as how to weaken the loading plate collision and boundary effects. , has been unable to overcome, resulting in slow improvement of true triaxial

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