水位下降条件下土钉加固土坡破坏特性研究

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。

Failure behavior of soil nailing-reinforced slopes under drawdown conditions

Drawdown is one of important causes to landslides, and soil nailing is an effective reinforcement. Centrifugal model tests were conducted to observe the deformation and failure process of soil nailing-reinforced slopes during drawdown. The histories of displacement of slopes were measured. The test results show that, under drawdown conditions, the slip surface of the reinforced slope goes across the nails and develops from the slope top downward to the slope surface. The failure process of the slopes exhibit significant coupling with the deformation localization. The soil nailing reinforcement mechanism is that the nail-soil interaction decreased the deformation and deformation localization and resulted in the increase of stability of slopes. Increasing the length of soil nails made the slip surface move to interior of the slope and significantly reduced the deformation localization of the slope, which in turn increase the stability of slopes under drawdown conditions.