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水位下降是导致滑坡的重要原因之一,而土钉是加固土坡的有效手段。进行离心模型试验,再现了水位下降时土钉加固土坡的变形和破坏过程,测量了土坡的位移变化。试验结果表明,水位下降条件下土钉加固土坡的破坏模式以绕钉破坏为主,滑裂面从坡顶逐渐向下发展至坡面;土钉加固土坡的破坏过程与变形局部化过程表现出显著的耦合变化;土钉加固机制主要表现为通过土钉与坡体的相互作用,减小土坡的变形和变形局部化程度,从而提高土坡的稳定性。增加土钉长度使得滑裂面向坡内部移动,显著减小土坡的变形及变形局部化程度,从而提高了土坡安全性。
Water level reduction is one of the important causes of landslide, and soil nailing is an effective means to reinforce the slope. Centrifuge model test was carried out to reproduce the deformation and failure process of soil nailing soil slope when the water level decreased, and the displacement of soil slope was measured. The test results show that the failure mode of soil nailing reinforced soil slope is dominated by nailing failure under the condition of falling water table, and the slip surface gradually develops from the top of slope to the slope surface. The failure process and deformation localization process of soil nailing slope Showing a significant change in coupling. The soil nailing mechanism is mainly manifested by the interaction between soil nailing and slope body to reduce the deformation of soil slope and deformation localization, so as to improve the stability of soil slope. Increasing the length of the soil nail makes the sliding surface move towards the inside of the slope, and the deformation and deformation localization of the slope are significantly reduced, thereby improving the safety of the slope.