SIMULATION MODELING AND SAMPLE SIZE EFFECT ANALYSIS FOR GRAVEL SOIL TRIAXIAL TEST

DONG Hui; LUO Xiao; LUO Zheng-dong; WANG Zhi-chao

2016 Vol. 22, No. 1

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Article navigation > Journal of Geomechanics > 2016 > 22(1): 104-113

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DONG Hui, LUO Xiao, LUO Zheng-dong, WANG Zhi-chao. SIMULATION MODELING AND SAMPLE SIZE EFFECT ANALYSIS FOR GRAVEL SOIL TRIAXIAL TEST[J]. Journal of Geomechanics, 2016, 22(1): 104-113.

Citation:

DONG Hui, LUO Xiao, LUO Zheng-dong, WANG Zhi-chao. SIMULATION MODELING AND SAMPLE SIZE EFFECT ANALYSIS FOR GRAVEL SOIL TRIAXIAL TEST[J]. Journal of Geomechanics, 2016, 22(1): 104-113.

SIMULATION MODELING AND SAMPLE SIZE EFFECT ANALYSIS FOR GRAVEL SOIL TRIAXIAL TEST

1.
College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China
2.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

Received Date: 02 September 2015

Publish Date: 25 March 2016

Abstract

Abstract

Based on the size effect in the gravel soil physics experiment, mechanical properties of the stress-strain, the strain, the cohesive force and inner friction angle of gravel soil was analyzed using discrete element theory and indoor triaxial test. The results showed that the proposed block generated law could realize the simulation of the crushed stone much more. The stress strain curves were almost unanimous (2% strain) at different diameter and height, but the rear part of the curve changes greatly, the smaller the diameter and height, the lower confining pressure stress, the more obvious softening phenomenon. The residual stress was constant after diameter 250 mm, height 350 mm. The peak stress increased with a linear growth rate of 25% with the sample diameter, but nonlinear growth along with the increase of height, when less than 200 mm, the high growth rate was 11.9%, and 28.9% after 200 mm. Damage body strain values were first increasing then decreasing, at the same time cohesive force increases of the linear growth with the diameter and in friction angle was reduced, but rule was just the opposite at different height.
- gravel soil /
- triaxial simulation /
- size effect

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References

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