关键词: 水位下降, 土钉加固土坡, 离心模型试验, 变形特性, 破坏机制

Abstract: 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.

Key words: drawdown, soil nailing-reinforced slope, centrifugal model test, deformation behavior, failure mechanism