[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()

筋带-砂-粘土层状体系直剪试验研究

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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

筋带-砂-粘土层状体系直剪试验研究

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

张波¹;  石名磊²;  白世伟¹

¹中国科学院武汉岩土力学研究所, 武汉 430071; ²东南大学交通学院, 南京 210096

Keywords:

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

高液限粘土;  直剪试验;  含水量;  法向荷载;  筋带-砂-粘土层状布置体系

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.

为了研究粘土与加筋材料接触面之间的力学特性, 及砂对粘土与筋带接触面力学特性的改善情况, 采用直剪试验方法对粘土与聚丙烯土工带polypropylene在粘土不同含水量条件下进行了不同法向荷载作用的直剪试验, 讨论了法向应力、含水量对高液限粘土与筋带之间剪切特性的影响;设计了筋带-砂-粘土层状布置体系的加筋土结构模型, 并根据设计的模型进行直剪试验.试验结果表明:粘土与筋带接触面之间的剪切强度随着法向应力的增加呈非线性增长;接触面的摩擦系数随着含水量的增加而减小, 接触面的粘聚力随含水量的增加先增大后减小, 粘土与接触面之间存在一个最佳的含水量, 这个值要比粘土压实的最佳含水量低2%左右;筋带-砂-粘土层状布置体系表明砂对粘土与筋带的剪切特性起到明显的改善作用.

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)
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Memo

Memo:

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

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