水化针刺GCL剪切破坏机理的试验研究

林海; 施建勇; 钱学德

doi:10.11779/CJGE201708003

水化针刺GCL剪切破坏机理的试验研究 English Version

林海^{1, 2},
施建勇²,
钱学德^{1, 3}

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. 密歇根州环境保护厅,密歇根兰辛 48933

基金项目: 国家自然科学基金重点项目（41530637）; 江西省青年科学基金项目（20161BAB216115）; 岩土力学与堤坝工程教育部重点实验室开放基金项目（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。

计量
- 文章访问数: 0279
- HTML全文浏览量: 0
- PDF下载量: 0269
出版历程
- 收稿日期: 2016-05-23
- 发布日期: 2017-08-24

Experimental research on shear failure mechanism of hydrated needle-punched GCLs

LIN Hai^{1, 2},
SHI Jian-yong²,
QIAN Xue-de^{1, 3}

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. Michigan Department of Environmental Quality, Lansing 48933, USA

摘要

摘要: 土工膨润土防水毯（GCL）的内部剪切强度是影响复合防渗衬里边坡稳定性的关键因素,加筋纤维的存在使针刺GCL的内部剪切强度明显高于非加筋GCL。含水化GCL的复合防渗衬里结构剪切试验会发生应力小峰值现象,但大都被研究人员忽视;加筋纤维对GCL峰值剪切强度的贡献处于定性阶段。通过开展GCL内夹钠基膨润土的饱和剪切试验和理论分析,证实应力小峰值现象为水化针刺GCL应力位移曲线的固有特征,并且小峰值应力代表了GCL内夹膨润土的抗剪强度贡献。以应力位移曲线上的应力小峰值现象为基础,将加筋纤维对GCL峰值剪切强度的贡献定量化,结合破坏机理分析了针刺GCL内部剪切破坏和应力位移发展过程。考虑针刺GCL剪切强度各部分贡献,提出了一种能反映针刺GCL破坏机理的峰值强度准则。
- 针刺GCL /
- 破坏机理 /
- 小位移应力峰值 /
- 峰值强度 /
- 强度准则
Abstract: The internal face of GCLs is one of the weak interfaces within the composite impermeable liners. Their internal shear strength is enhanced by the reinforced needle-punched fiber. Through comprehensive analysis of the existing internal shear test results of needle-punched GCLs and large simple shear test results of GCL+GM composite liners, small peak stress is found to appear at small displacements in internal shear stress-displacement curves of hydrated GCLs. By conducting shear tests on hydrated GCLs-encased sodium bentonite, combined with theoretical analysis, the occurrence of the small peak stress at small displacements is confirmed to be the inherent feature in the stress-displacement curve of hydrated GCLs, and the small peak stress represents the shear strength contribution from GCL-encased bentonite. On the basis of the small peak stress phenomenon in the stress-displacement curves of needle-punched GCLs, the contribution of the reinforced fiber to the shear strength is obtained quantitatively, and the whole process of internal shear failure and stress-displacement development of GCLs is analyzed based on the failure mechanism. Considering the contribution of each part of needle-punched GCLs to the shear strength, a peak shear strength criterion model which can reflect the failure mechanism of needle-punched GCLs is proposed.
- needle-punched GCL /
- failure mechanism /
- stress peak at small displacement /
- peak strength /
- strength criterion

HTML全文

参考文献(17)

[1]	钱学德, 施建勇, 刘晓东. 现代卫生填埋场的设计与施工[M]. 2版. 北京: 中国建筑工业出版社, 2011. (QIAN Xue-de, SHI Jian-yong, LIU Xiao-dong. Design and construction of modern sanitary landfills[M]. 2nd ed. Beijing: China Architecture and Building Press, 2011. (in Chinese))
[2]	FOX P J, ROSS J D. Relationship between NP GCL internal and HDPE GMX/NP GCL interface shear strengths[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 137(8): 743-753.
[3]	FOX P J, SURA J M, NYE C J. Dynamic shear strength of a needle-punched GCL for monotonic loading[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2015, 141(7): 04015025.
[4]	徐超, 李志斌. 针刺GCL内部剪切强度的试验研究[J]. 同济大学学报(自然科学版), 2010, 38(5): 639-643. (XU Chao, LI Zhi-bin. Experimental research on internal shear strength of needle-punched GCL[J]. Journal of Tongji University (Natural Science), 2010, 38(5): 639-643. (in Chinese))
[5]	EID H T. Shear strength of geosynthetic composite systems for design of landfill liner and cover slopes[J]. Geotextiles and Geomembranes, 2011, 29(3): 335-344.
[6]	林海, 章玲玲, 阮晓波, 等. 水化针刺GCL+GM复合衬里的单剪破坏特征[J]. 岩土工程学报, 2016, 38(9): 1160-1167. (LIN Hai, ZHANG Ling-ling, RUAN Xiao-bo, et al. Simple-shear failure characteristics of hydrated needle- punched GCL+GM composite liner[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(9): 1160-1167. (in Chinese))
[7]	FOX P J, ROWLAND M G, SCHEITHE J R. Internal shear strength of three geosynthetic clay liners[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1998, 124(10): 933-944.
[8]	CHIU P, FOX P J. Internal and interface shear strengths of unreinforced and needle-punched geosynthetic clay liners[J]. Geosynthetics International, 2004, 11(3): 176-199.
[9]	ZORNBERG J G, MCCARTNEY J S, SWAN J R H. Analysis of a large database of GCL internal shear strength results[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(3): 367-380.
[10]	FOX P J, STARK T D. State-of-the-art report: GCL shear strength and its measurement[J]. Geosynthetics International, 2004, 11(3): 141-175.
[11]	NYE C J, FOX P J. Dynamic shear behavior of a needle-punched geosynthetic clay liner[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(8): 973-983.
[12]	GILBERT R B, FERNANDEZ F, HORSFIELD D W. Shear strength of reinforced geosynthetic clay liner[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1996, 122(4): 259-265.
[13]	STARK T D, EID H T. Shear behavior of reinforced geosynthetic clay liners[J]. Geosynthetics International, 1996, 3(6): 771-786.
[14]	FOX P J, KIM R H. Effect of progressive failure on measured shear strength of geomembrane/GCL interface[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2008, 134(4): 459-469.
[15]	MESRI G, OLSON R E. Shear strength of montmorillonite[J]. Géotechnique, 1970, 20(3): 261-270.
[16]	GLEASON M H, DANIEL D E, EYKHOLT G R. Calcium and sodium bentonite for hydraulic containment applications[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1997, 123(5): 438-445.
[17]	TIWARI B, AJMERA B. A new correlation relating the shear strength of reconstituted soil to the proportions of clay minerals and plasticity characteristics[J]. Applied Clay Science, 2011, 53(4): 48-57.