Abstract Geosynthetic clay liners (GCLs), used to repair small earth dams, are typically installed with the GCL panel placed parallel to the upstream slope of the dam or on the surface of benches cut into the upstream side of the earth dam fill. While the former requires less earthwork, leading to a more cost-effective and rapid construction, it can potentially introduce a plane of weakness if the interface shear strength between the GCL and the cover soil is less than the shear strength of the cover soil. The inclusion of benches in the upstream slope of an earth dam can potentially be an effective strategy for reducing the significance of this preferential failure plane, resulting in an increased seismic performance during earthquakes. However, the expected increase in seismic performance has not yet been quantified in large-scale shaking table tests. In this study, a full-scale shaking table test on an earth dam with a GCL installed parallel to the upstream slope of the dam is reported and compared to previously published results from tests on an identical earth dam with the GCL placed in the benched configuration under the same seismic boundary conditions. The results indicate that, for the configuration tested, the seismic deformation of the benched installation was half of that of the earth dam with the GCL installed parallel to the slope, providing significant motivation for adopting the benched installation method.

中文翻译：

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安装几何形状对土工合成粘土衬砌小土坝动力稳定性的影响

摘要 用于修复小型土坝的土工合成粘土衬砌（GCL）通常安装在与坝上游坡平行或切入土坝填土上游侧的长凳表面上。虽然前者需要较少的土方工作，从而导致更具成本效益和更快的施工，但如果 GCL 和覆盖土之间的界面剪切强度小于覆盖土的剪切强度，它可能会引入薄弱面。在土坝的上游斜坡中包含长凳可能是减少这种优先破坏平面的重要性的有效策略，从而提高地震期间的抗震性能。然而，大型振动台试验尚未量化抗震性能的预期增长。在这项研究中，报告了在与大坝上游斜坡平行安装 GCL 的土坝上进行的全尺寸振动台试验，并与先前公布的在相同土坝上进行的试验结果进行比较，该土坝将 GCL 放置在台架配置中在相同的地震边界条件下。结果表明，对于测试的配置，台架安装的地震变形是土坝的一半，GCL平行于斜坡安装，为采用台架安装方法提供了重要动力。报告了在与大坝上游斜坡平行安装 GCL 的土坝上进行的全尺寸振动台试验，并与先前公布的在相同地震下将 GCL 置于台架配置的相同土坝上的测试结果进行比较边界条件。结果表明，对于测试的配置，台架安装的地震变形是土坝的一半，GCL平行于斜坡安装，为采用台架安装方法提供了重要动力。报告了在与大坝上游斜坡平行安装 GCL 的土坝上进行的全尺寸振动台试验，并与先前公布的在相同地震下将 GCL 置于台架配置的相同土坝上的测试结果进行比较边界条件。结果表明，对于测试的配置，台架安装的地震变形是土坝的一半，GCL平行于斜坡安装，为采用台架安装方法提供了重要动力。