Kyoto University LEAP-GWU-2015 tests and the importance of curving the ground surface in centrifuge modelling
Kyoto University LEAP-GWU-2015 tests and the importance of curving the ground surface in centrifuge modelling
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DOI：
10.1016/j.soildyn.2017.10.012
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发表时间：
2017-11
影响因子：
4
通讯作者：
T. Tobita;Takayuki Ashino;Jianfei Ren;S. Iai
中科院分区：
文献类型：
--
作者：
T. Tobita;Takayuki Ashino;Jianfei Ren;S. Iai
本文介绍了LEAP-GWU-2015的测试过程和结果，并对离心模型中径向重力场的影响进行了研究。比较了两种模型的动力响应。一个具有相对于容器底部倾斜5 °的平面;另一个具有弯曲表面以保持相对于径向g场的恒定倾斜角。对于本研究中所采用的离心试验，斜坡和底部激励是在旋转离心机的切线方向上。结果表明，由于与横向位移相关的循环流动性，两种模型的加速度记录出现尖峰。而对于平面模型，负（上坡）方向的加速度尖峰更突出，下坡剩余地面变形更大。在平面模型中观察到较大的侧向位移，而在弯曲模型中的表面位移较小并且沿模型的长度沿着均匀。对于平面模型，作用在坡顶附近的径向重力几乎不变，并向坡脚逐渐增大，导致有效坡角净增加。通过比较，认识到弯曲模型地面的重要性，因为它导致沿模型表面的长度沿着均匀的侧向位移。
This paper presents a description of testing procedure and results of the LEAP-GWU-2015, and an investigation of the effect of the radial gravity field in centrifuge modelling. Dynamic responses of two models are compared. One had a planar surface with a 5° slope relative to the base of the container; the other had a curved surface to maintain a constant slope angle with respect to the radial g-field. For the centrifuge tests employed in this study, the slope and base excitation are in the tangential direction to spinning centrifuge. Results show that spikes in acceleration records due to cyclic mobility associated with lateral displacements appeared on both models. However, for the plane surface model, acceleration spikes in the negative (upslope) direction are more prominent and the residual downslope ground deformation was larger. Larger lateral displacement was observed in the plane model, while surface displacements in the curved model are smaller and uniform along the length of the model. For the plane model, the radial gravity acting near the slope top is almost constant and gradually increases towards the slope toe which causes a net increase in effective slope angle. Through the comparison the importance of curving the model ground surface is recognized as leading to uniform lateral displacements along the length of the model surface.