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Shaking table modeling of MSE/soil nail hybrid retaining walls

机译：MSE /土钉混合挡土墙的振动台建模

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A series of 1-g shaking table tests using variable-amplitude harmonic excitations was performed on 0.8-m-high MSE/soil nail hybrid retaining (MSE/SN) wall models to investigate the seismic behavior of this innovative retaining earth structure. The tests were conducted on physical wall models with strips having a constant length and different nail lengths under loading conditions with different peak accelerations and durations. It was found that the deformation mode and the horizontal displacements of the MSE/SN walls were highly dependent on the length of the nails, such that L/H = 0.7 can be defined as the critical ratio in seismic conditions for MSE/SN walls which have been reinforced with strips having a constant length. Irrespective of the different nail lengths, the pattern of the observed failure mechanism included a moving block which was delineated by a two-part failure plane consisting of a concave curve and an inclined line with a certain point of intersection. Also, a consistent range of the normalized horizontal displacements (Delta x/H), about 0.55-1.10%, corresponding to the formation of local shear bands, and a range of Delta x/H = 5.0-5.6%, corresponding to the development of active wedge failure, were determined. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：在高0.8 m的MSE /土钉混合挡土墙（MSE / SN）墙模型上进行了一系列使用变幅谐波激励的1-g振动台试验，以研究这种创新的挡土结构的抗震性能。测试是在物理墙体模型上进行的，在负载条件下，具有恒定长度和不同钉子长度的条带具有不同的峰值加速度和持续时间。结果发现，MSE / SN墙的变形模式和水平位移高度取决于钉子的长度，因此L / H = 0.7可以定义为MSE / SN墙在地震条件下的临界比，用长度固定的条加强。无论钉子的长度不同，所观察到的破坏机理的模式都包括一个移动块，该移动块由两部分破坏平面勾勒，该破坏平面由凹曲线和具有一定交点的倾斜线组成。同样，归一化水平位移的一致范围（Delta x / H）大约为0.55-1.10％，对应于局部剪切带的形成，而Deltax / H = 5.0-5.6％的范围对应于发展确定主动楔形破坏的原因。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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