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Local data analysis for eliminating end restraint of triaxial specimen

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Abstract

A data processing method was proposed for eliminating the end restraint in triaxial tests of soil. A digital image processing method was used to calculate the local deformations and local stresses for any region on the surface of triaxial soil specimens. The principle and implementation of this digital image processing method were introduced as well as the calculation method for local mechanical properties of soil specimens. Comparisons were made between the test results calculated by the data from both the entire specimen and local regions, and it was found that the deformations were more uniform in the middle region compared with the entire specimen. In order to quantify the nonuniform characteristic of deformation, the non-uniformity coefficients of strain were defined and calculated. Traditional and end-lubricated triaxial tests were conducted under the same condition to investigate the effects of using local region data for deformation calculation on eliminating the end restraint of specimens. After the statistical analysis of all test results, it was concluded that for the tested soil specimen with the size of 39.1 mm × 80 mm, the utilization of the middle 35 mm region of traditional specimens in data processing had a better effect on eliminating end restraint compared with end lubrication. Furthermore, the local data analysis in this paper was validated through the comparisons with the test results from other researchers.

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Authors and Affiliations

  1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China

    Xiao Liu  (刘 潇), Longtan Shao  (邵龙潭) & Xiaoxia Guo  (郭晓霞)

  2. School of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168, China

    Xiao Liu  (刘 潇)

Authors
  1. Xiao Liu  (刘 潇)
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  2. Longtan Shao  (邵龙潭)
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  3. Xiaoxia Guo  (郭晓霞)
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Corresponding author

Correspondence to Xiao Liu  (刘 潇).

Additional information

Supported by Major State Basic Research Development Program of China(“973” Program, No. 2010CB731502).

Liu Xiao, born in 1982, male, Dr.

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Liu, X., Shao, L. & Guo, X. Local data analysis for eliminating end restraint of triaxial specimen. Trans. Tianjin Univ. 19, 372–380 (2013). https://doi.org/10.1007/s12209-013-2000-1

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