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Volume 39 Issue 8
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LIN Hai, SHI Jian-yong, QIAN Xue-de. Experimental research on shear failure mechanism of hydrated needle-punched GCLs[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(8): 1374-1380. DOI: 10.11779/CJGE201708003
Citation: LIN Hai, SHI Jian-yong, QIAN Xue-de. Experimental research on shear failure mechanism of hydrated needle-punched GCLs[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(8): 1374-1380. DOI: 10.11779/CJGE201708003
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Experimental research on shear failure mechanism of hydrated needle-punched GCLs

  • 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

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  • Received Date: May 23, 2016
  • Published Date: August 24, 2017
    Graphical Abstract
    • 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.
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    • References (17)
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