水化针刺GCL+GM复合衬里的单剪破坏特征

林海; 章玲玲; 阮晓波; 刘小文

doi:10.11779/CJGE201609013

水化针刺GCL+GM复合衬里的单剪破坏特征 English Version

1. 南昌大学建筑工程学院,江西南昌 330031;
2. 岩土力学与堤坝工程教育部重点实验室(河海大学),江苏南京 210098;
3. 江西交通职业技术学院建筑工程系,江西南昌 330013;
4. 合肥工业大学交通运输工程学院,安徽合肥 230009

基金项目: 国家自然科学基金项目（51268046）; 河海大学岩土力学与堤坝工程教育部重点试验室开放基金项目（GH201404）

详细信息

作者简介:
林海（1986- ）,男,江西上饶人,讲师,从事土力学与基础工程教学和环境岩土工程研究工作。E-mail: linhai@ncu.edu.cn。

中图分类号: TU411.99
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出版历程
- 收稿日期: 2015-09-29
- 发布日期: 2016-09-24

Simple-shear failure characteristics of hydrated needle-punched GCL+GM composite liner

1. School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China;
2. Key Laboratory of Geomechanics and Embankment Engineering of the Ministry of Education, Hohai University, Nanjing 210098, China;
3. Department of Architectural Engineering, Jiangxi V&T College of Communication, Nanchang 330013, China;
4. School of Transportation Engineering, Hefei University of Technology, Hefei 230009, China

摘要

摘要: 针刺GCL和HDPE土工膜(GM)广泛应用于填埋场防渗衬里,GCL的内部剪切强度和GCL/GM界面剪切强度是填埋场复合衬里边坡滑移稳定性的控制因素。通过开展不限定剪切破坏面的水化针刺GCL+GM复合衬里大单剪试验,获得了剪切过程中GCL/GM界面位移和GCL内部位移发展规律,分析了GM的糙面分别与GCL的有纺面和无纺面接触时的峰值强度,揭示了GCL+GM复合衬里的整体剪切破坏特征。试验结果表明：大单剪试验能够正确和合理地模拟GCL与GM间的相互作用,GCL+GM复合衬里中的极限破坏面不仅会随着法向应力的增加而发生转移,甚至出现GCL内部和GCL/GM界面同时成为剪切破坏面的临界状态。
- 针刺GCL /
- 单剪 /
- 破坏特征 /
- 复合衬里 /
- 界面
Abstract: Needle-punched GCL and HDPE geomembrane are widely used in landfill impermeable liner. The internal shear strength of GCL and shear strength of GCL/GM interface are the key factors influencing the slope stability of landfill composite liner. Large-scale simple-shear tests on hydrated needle-punched GCL+GM composite liner are conducted without forcing the shear failure to occur along a pre-determined plane. The development patterns of displacement of GCL/GM interface and internal displacement of GCL are obtained. The peak shear strengths of composite liner when the rough side of GM contacts respectively with the woven geotextile side and the nonwoven geotextile side of GCL are analyzed. The overall shear failure characteristics of hydrated needle-punched GCL+GM composite liner are revealed. The test results show that the large-scale simple-shear tests can correctly and reasonably simulate interactions of GCL and GM. The ultimate failure surface may change with the increase of normal stress, even there may exist a critical state in which both GCL internal surface and GCL/GM interface are the ultimate failure surfaces.
- needle-punched GCL /
- simple shear /
- failure characteristic /
- composite liner /
- interface

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参考文献(16)

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