Development and preliminary application of a microfriction load-transfer plate for triaxial tests in geotechnical engineering

WANG Yan-li; CHENG Zhan-lin; PAN Jia-jun; XU Han; WANG Jun-xiong

doi:10.11779/CJGE202012019

Volume 42 Issue 12

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Chinese Journal of Geotechnical Engineering > 2020 > 42(12): 2316-2321. > DOI: 10.11779/CJGE202012019

WANG Yan-li, CHENG Zhan-lin, PAN Jia-jun, XU Han, WANG Jun-xiong. Development and preliminary application of a microfriction load-transfer plate for triaxial tests in geotechnical engineering[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(12): 2316-2321. DOI: 10.11779/CJGE202012019

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Development and preliminary application of a microfriction load-transfer plate for triaxial tests in geotechnical engineering

Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China

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Received Date: March 08, 2020
Available Online: December 05, 2022

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Abstract

Abstract

In order to solve the problem of end restraint in triaxial tests on coarse-grained soils, based on a new friction reduction method in which the contact between soils and loading plates is changed from the integral contact to the distributed one and the sliding friction to the rolling one, a load-transfer plate with microfriction loads for triaxial compression tests in geotechnical engineering is developed. The development idea, structural principle and detailed structure of the apparatus are introduced, and the effects of the friction-reducing measures of the distributed contact instead of the integral one are further demonstrated by numerical calculation. By use of this apparatus and a large-scale stress-strain triaxial apparatus, the consolidated drainage triaxial shear tests on the conventional and end friction reduction of typical sand are carried out. The strength and deformation characteristics of sand under normal end restraint and end free (micro-friction) are studied, and the effects of end restraint on stress-strain characteristics of sand are analyzed. The results show that the end restraint is the basic reason for the swelling of the specimen, the peak strength of the specimen is overestimated by the conventional test method, the deviatoric stress-strain curve is softened easily, and the volumetric strain curve of the specimen shows more prominent dilatancy. The apparatus effectively solves the problem of end restraint in triaxial tests and improves the accuracy of triaxial tests.
- microfriction load-transfer plate,
- triaxial test,
- integral contact,
- distributed contact,
- end restraint

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