Henan Key Laboratory of Geomechanics and Structural Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China.
Powerchina Guiyang Engineering Corporation Ltd, Guizhou, 550081, China.
Sci Rep. 2023 Mar 29;13(1):5149. doi: 10.1038/s41598-023-32477-9.
The destruction of the locked-segment type landslide is often accompanied by the destruction of the locked segment with cumulative effects. Investigating the failure mode and instability mechanism of locked-segment type landslides is crucial. The study uses physical models to examine the evolution of locked-segment type landslides with retaining-walls. It utilizes a variety of instruments (tilt sensors, micro earth pressure sensors, pore water pressure sensors, strain gauges, and others) to conduct physical model tests of locked-segment type landslide with retaining-wall and to reveal the tilting deformation and evolution mechanism of retaining-wall locked landslide under the condition of rainfall. The results showed that the regularity of tilting rate, tilting acceleration, strain, and stress change in the retaining-wall locked segment is consistent with the landslide evolution process, indicating that tilting deformation can be used as the criterion of landslide instability and that the locked segment plays a vital role in controlling the landslide stability. The tertiary creep stages of tilting deformation are divided into initial, medium, and high tertiary creep stages using an improved angle tangent method. This establishes the failure criterion for locked-segment type landslides with tilting angles of 0.34°, 1.89°, and 4.38°. In addition, the tilting deformation curve of a locked-segment type landslide with a retaining-wall is utilized to predict the landslide instability by the reciprocal velocity method.
锁定型滑坡的破坏往往伴随着累积效应下锁定段的破坏。研究锁定型滑坡的破坏模式和失稳机制至关重要。本研究采用物理模型，研究了挡墙作用下锁定型滑坡的演化过程。利用多种仪器（倾斜传感器、微土压力传感器、孔隙水压力传感器、应变计等）对挡墙锁定型滑坡进行物理模型试验，揭示了降雨条件下挡墙锁定滑坡的倾斜变形和演化机制。结果表明，挡墙锁定段的倾斜率、倾斜加速度、应变和应力变化规律与滑坡演化过程一致，表明倾斜变形可以作为滑坡失稳的判据，锁定段对控制滑坡稳定性起着至关重要的作用。采用改进的角正切法将倾斜变形的三级蠕变阶段分为初始、中等和高三级蠕变阶段。建立了以倾斜角为 0.34°、1.89°和 4.38°的锁定型滑坡破坏判据。此外，利用挡墙锁定型滑坡的倾斜变形曲线，通过倒数速度法对滑坡失稳进行预测。
