Journal Published Online: 09 December 2020
Volume 44, Issue 5

A Large-Scale True Triaxial Apparatus with Rigid-Flexible-Flexible Boundary for Granular Materials

CODEN: GTJODJ

Abstract

The true triaxial apparatus is applied to test the deformation properties of coarse soil under three principal stress loadings without mutual interference. In this paper, based on the true triaxial apparatus mechanism under a vertical rigid boundary and an orthogonal two-direction flexible boundary on the horizontal plane loading, the small-scale true triaxial instrument with a specimen size of 70 by 70 by 70 mm and 70 by 70 by 140 mm is further developed into a large-scale true triaxial instrument with a specimen size of 300 by 300 by 600 mm. The two characteristics of the chamber loading mechanism are the adjacent flexible hydraulic capsule isolated by the balance plate device and servo hydraulic loading with Proportional-Integral-Differential (PID) closed control algorithm. The problem of mutual interference between two orthogonal flexible capsules on the horizontal plane is solved by using the isolation balance plate device. PID closed control optimization algorithm is used to solve the stability problem of an automatic control system. Finally, to verify the effectiveness and accuracy of a large-scale true triaxial instrument, a series of coarse soil tests were carried out to investigate the strength and deformation characteristics of geotechnical materials.

Author Information

Shao, Shengjun
Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, China
Wang, Yongxin
Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, China
Shao, Shuai
Civil Engineering and Architecture, Xi’an University of Technology, Xi’an, China
Pages: 18
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: GTJ20190359
ISSN: 0149-6115
DOI: 10.1520/GTJ20190359