[1] Zhang Bo, Shi Minglei, Bai Shiwei,. Investigation on reinforcement-sand-clay layer systemusing direct-shear test [J]. Journal of Southeast University (English Edition), 2006, 22 (4): 544-548. [doi:10.3969/j.issn.1003-7985.2006.04.021]

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Investigation on reinforcement-sand-clay layer systemusing direct-shear test()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

22

Issue:

2006 4

Page:

544-548

Research Field:

Civil Engineering

Publishing date:

2006-12-30

Info

Title:

Investigation on reinforcement-sand-clay layer systemusing direct-shear test

Author(s):

Zhang Bo¹;  Shi Minglei²;  Bai Shiwei¹

¹Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
² School of Transportation, Southeast University, Nanjing 210096, China

Keywords:

high liquid limit clay;  direct-shear test;  water content;  normal stress;  reinforcement-sand-clay layer system

PACS:

TU411.93

DOI:

10.3969/j.issn.1003-7985.2006.04.021

Abstract:

The property of the contact surface between geosynthetics and soil directly affects the whole structure’s stability. The interface property is one of the most important indices for the reinforced structure.Systematic direct-shear tests with large direct-shear apparatus are carried out for geobelt reinforced clay under different normal stresses and water content.A reinforcement-sand-clay layer system improving the interface behavior greatly is designed. The stress-strain relationship is investigated on the basis of the experimental results.The results show that with the increase of the normal stress, the shear strength between the clay and the reinforcement increases nonlinearly, and with the increase of the water content, the friction coefficient between the clay and the reinforcement decreases dramatically and the cohesion between the clay and the polypropylene geobelt increases initially, then decreases.There is an optimal value for the water content between the clay and the polypropylene geobelt, which is 2% lower than the optimal water content of clay compaction.This reinforcement-sand-clay layer system improves the shear strength of the interface remarkably.Therefore, the clay-sand-reinforcement layer system is a rather good design for practical use in reinforcement engineering.

References:

[1] Izzaldin Almohd, Murad Abu-Farsakh, Khalid Farrag. Geosynthetic reinforcement-cohesive soil interface during pullout[A].In: 13th Great Lakes Geotechnical and Geoenvironmental Conference[C]. Milwaukee, WI, USA, 2006.40-49.
[2] Bergado D T, Chai J C, Balasubramaniam A S.Interaction between grid reinforcement and cohesive-frictional soil[A].In:Proceedings of Earch Reinforcement Practice[C].Kyushu, Japan, 1992.29-34.
[3] Hausmann M R, Ring G J. Measurement of soil-reinforcement interaction[A].In: Proceedings of the Technical Association of the Pulp and Paper Industry[C]. Wellington, New Zealand, 1980.149-153.
[4] Hausmann M R, Clarke J.Fly ash-geosynthetic interation[A].In:Proceedings of the 5th International Conference on Geosynthetics[C].Singapore, 1994.433-436.
[5] Liu Lin, Li Guiying, Li Chi.Testing study on interaction characteristics between Aeolian sand and geogrids[J].Highway & Transportation on Inner Mongolia, 2003(1):4-6.(in Chinese)
[6] Shi Youzhi.Research on geosynthetics by pull-out tests[J].Getotechnical Engineering World, 2003, 6(10):75-78.(in Chinese)
[7] Yin Guangzhi, Zhang Dongming, Wei Zuoan, et al.Testing study on interaction characteristics between fine grained tailings and geosynthetics[J].Chinese Journal of Rock Mechnics and Engineering, 2004, 23(2):426-429.(in Chinese)
[8] Xu Chao, Zhao Chunfeng, Ye Guanbao.Research on interface between soil and geosynthetics [J].Journal of Tongji University (Natural Science Edition), 2004, 32(3):307-311.(in Chinese)

Memo

Memo:

Biographies: Zhang Bo(1979—), male, graduate;Bai Shiwei(corresponding author), male, professor, swbai@whrsm.ac.cn.

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