Shear Properties of GM/GCL Interface under Multilevel Loading

XU Tian-jie; LIU Bin-yun; LI Wei-chao; CAI Hong

doi:10.3969/j.issn.1001-5485.2015.08.011

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Journal of Changjiang River Scientific Research Institute ›› 2015, Vol. 32 ›› Issue (8) : 61-64. DOI: 10.3969/j.issn.1001-5485.2015.08.011

ROCK SOIL ENGINEERING

Shear Properties of GM/GCL Interface under Multilevel Loading

XU Tian-jie¹,LIU Bin-yun^1,2,LI Wei-chao³,CAI Hong³

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Abstract

As an impermeable material, geomembrane (GM) has been widely used in engineering and environmental fields, but the damage during construction will reduce its shear strength. In view of this we conducted multilevel loading and direct shear tests on GM/GCL (geosynthetic clay liner) interfaces using a large size direct shear apparatus. Results show that the peak shear strength under multilevel loading is much lower than that under direct shear, and obvious strain softening of the interface occurs under both shear modes; the peak shear strength and residual strength under multilevel loading are close to those under direct shear when the normal stress is from 7.1 to 52.1kPa; repeated shearing under large normal stress has great damage on geomembrane which leads to a loss of 7.05 ° in terms of peak friction angle and 3.09 ° in terms of residual friction angle when the normal stress is greater than 102.1kPa under multilevel loading.

Key words

geomembrane / GCL / multilevel loading / shear strength / strain softening

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XU Tian-jie,LIU Bin-yun,LI Wei-chao,CAI Hong. Shear Properties of GM/GCL Interface under Multilevel Loading[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(8): 61-64 https://doi.org/10.3969/j.issn.1001-5485.2015.08.011

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