Research on shear strength of needle-punched GCL by simple-shear of composite liner
Research on shear strength of needle-punched GCL by simple-shear of composite liner
复制标题
复合材料衬里单剪针刺GCL剪切强度研究
DOI：
10.1016/j.enggeo.2018.07.022
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发表时间：
2018-06
影响因子：
7.4
通讯作者：
Xiong Yuechen
中科院分区：
文献类型：
--
作者：
Lin Hai;Zhang Lingling;Xiong Yuechen
土工合成材料具有良好的抗渗性能，被广泛应用于垃圾填埋场衬垫。然而，平移故障沿着一个多层土工合成材料衬垫系统是一个主要的关注垃圾填埋场衬垫的边坡稳定性。衬垫抗剪强度的合理确定是填埋场稳定性分析的关键。为此，在不迫使剪切破坏发生沿着预定的破坏面的情况下，对覆盖在土工膜上的土工合成粘土衬垫（GCL）进行了大规模剪切试验。根据GCL的界面和内部位移，得到不同的破坏模式。水化针刺GCL的剪应力-位移曲线在小位移处出现拐点现象。通过实验分析证实了这是水合GCL的一个固有特征。基于应力-位移曲线上的拐点现象，分析了水化NP GCL的剪切机理。NP GCL的峰值剪切强度可以分为两个分量的贡献，即，膨润土和增强剂。提出了一个能反映GCL破坏机理的峰值抗剪强度模型，该模型考虑了GCL的各个抗剪强度贡献。
Geosynthetic composites are widely used in landfill liners owing to their excellent impermeability. However, translational failure along a multi-layered geosynthetic liner system is a major concern for the slope stability of landfill liners. Reasonable determination of the liner shear strength is vital for analysis of landfill stability. For this purpose, large-scale shear tests of a geosynthetic clay liner (GCL) overlying a geomembrane were performed without forcing shear failure to occur along a pre-determined failure plane. Different failure modes are obtained according to the interface and internal displacements of the GCL. The inflection point phenomenon is observed at small displacements on the shear stress versus displacement curve of hydrated needle-punched (NP) GCL. This is confirmed to be an inherent feature of hydrated GCL through experimental analysis. The shear mechanism of hydrated NP GCL is analyzed based on the inflection point phenomenon on the stress-displacement curve. The peak shear strength of a NP GCL can be divided into contributions from two components i.e., bentonite and reinforcement. A peak shear strength model that can reflect the failure mechanism is proposed considering each shear strength contribution of the GCL.
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影响因子：
7.4
作者：
T. Katsumi;C. Benson;Gary J. Foose;M. Kamon
通讯作者：
T. Katsumi;C. Benson;Gary J. Foose;M. Kamon
影响因子：
4.5
作者：
T. Stark;H. Eid
通讯作者：
T. Stark;H. Eid
DOI：
10.1061/(asce)1090-0241(2007)133:8(973
发表时间：
2007-08
影响因子：
3.9
作者：
C. Nye;P. Fox
通讯作者：
C. Nye;P. Fox
影响因子：
5.2
作者：
A. Vukelic;A. Szavits-Nossan;P. Kvasnička
通讯作者：
A. Vukelic;A. Szavits-Nossan;P. Kvasnička
DOI：
10.1061/40515(291)1
发表时间：
2000-07
期刊：
--
影响因子：
--
作者：
R. Koerner;T. Soong
通讯作者：
R. Koerner;T. Soong