Using a modified direct shear apparatus to explore gap and size effects on shear resistance of coarse-grained soil--颗粒学报PARTICUOLOGY

Fu, W., Zheng, X., Lei, X., & Deng, J. (2015). Using a modified direct shear apparatus to explore gap and size effects on shear resistance of coarse-grained soil. Particuology, 23, 82-89. https://doi.org/10.1016/j.partic.2014.11.013

Using a modified direct shear apparatus to explore gap and size effects on shear resistance of coarse-grained soil

Wenxi Fu ^a, Xing Zheng ^b, Xiaozhang Lei ^a *, Jianhui Deng ^a

a State Key Laboratory of Hydraulic and Mountain River Engineering, Sichuan University, Chengdu 610065, China
b Civil Engineering, Hydrochina Guiyang Engineering Corporation LTD, Guiyang 550081, China

10.1016/j.partic.2014.11.013

Volume 23, December 2015, Pages 82-89

Received 21 June 2014, Revised 15 October 2014, Accepted 7 November 2014, Available online 20 April 2015, Version of Record 2 December 2015.

E-mail: xiaozhang_lee@sina.com

Highlights

• The modified DSA was used to explore effects of gap and specimen size on shear strength.

• The gap and specimen size had significant influences on shear resistance of coarse-grained soil.

• The results presented reasonable values of gap and specimen size for two soil samples.

Abstract

This work used a modified direct shear apparatus, created newly by the authors, to explore effects of the gap between shear box halves and specimen size on the shear resistance of coarse-grained soil. The shear boxes of this apparatus were assembled from a series of steel structures capable of superimposition and nesting. Such characteristics facilitated variation of specimen size in both diameter and height. The new device can also maintain a constant gap during shearing. We performed a series of gap-effect and size-effect tests for two uniformly graded, coarse-grained soil samples. The test results showed that both the gap space and specimen size had significant influences on shear resistance of the coarse-grained soil. Further, analysis of variations in shear strength indices led to a reasonable gap dimension and specimen size of the two soil samples.

Graphical abstract

Keywords

Direct shear apparatus; Gap effect; Size effect; Shear resistance; Coarse-grained soil

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