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Centrifuge modeling of the geogrid-reinforced slope subjected to differential settlement
Acta Geotechnica ( IF 5.7 ) Pub Date : 2020-06-27 , DOI: 10.1007/s11440-020-01010-x
Fangyue Luo , Renlong Huang , Ga Zhang

A series of centrifuge model tests of geogrid-reinforced slopes with superstructure was conducted under differential settlement condition. The influence of reinforcement placement on the deformation and failure behavior of the slope and superstructure is investigated by considering different numbers of geogrid layers. The response of the slope and superstructure is analyzed based on a full-field displacement measurement via image analysis. The differential settlement induces distinguishable superstructure movement and slope deformation above the subsidence zone. The slope displacement, close to the vertical direction, appears only in a limited zone. An integrated analysis scheme of deformation and failure processes is adopted to reveal the failure mechanism of both the unreinforced and reinforced slopes: a certain level of deformation localization induced by differential settlement results in the local failure, and adversely, the local failure aggravates the deformation localization near it. The geogrid reinforcement mechanism is further clarified as the reduction on the deformation localization of the slope due to geogrid placement. The geogrid reinforcement effect can be comprehensively described with two respects: hooping effect and shielding effect, which illustrates the influence sphere and degree of geogrid reinforcement on restraining the slope deformation. The geogrid reinforcement is proven effective to improve the safety of the slope and superstructure.

中文翻译:

差异沉降下土工格栅加筋边坡的离心模型

在不同沉降条件下,对上部结构土工格栅加筋的边坡进行了一系列离心模型试验。通过考虑土工格栅层数的不同,研究了配筋位置对边坡和上部结构的变形和破坏行为的影响。基于全场位移测量,通过图像分析来分析斜坡和上部结构的响应。差异沉降引起沉降区上方明显的上部结构运动和边坡变形。接近垂直方向的斜坡位移仅出现在有限的区域中。采用变形和破坏过程的综合分析方案,揭示了未加固边坡和加固边坡的破坏机理:由差异沉降引起的一定程度的变形局部化会导致局部破坏,不利的是,局部破坏会加剧其附近的变形局部化。土工格栅的加固机制进一步明确,因为土工格栅的放置会降低边坡的变形局部。土工格栅的加固效果可以从两个方面进行全面描述:箍筋效应屏蔽效应,说明了土工格栅加筋程度对抑制边坡变形的影响。土工格栅加固已被证明可有效提高边坡和上部结构的安全性。
更新日期:2020-06-27
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