Abstract A concrete cut-off wall has been recently used in a landslide dam as an anti-seepage measure. Due to it is under a complex loading condition, the wall may undergo inelastic straining and have a potential of cracking. Several centrifuge model tests and numerical simulation are conducted to investigate the damage behavior of the cut-off wall. The numerical method of concurrently modelling small cracks in the cut-off wall and the overall landslide dam based on the finite element method (FEM)-Peridynamics (PD) multiscale coupling method is confirmed to be effective by the centrifuge model tests. The cut-off wall buried in a landslide dam bears a bending effect under lateral loadings in the absence of overlying fill. The lower part of the wall may have a potential to form cracks induced by large bending moments. The wall is in a tension-shear failure mode with an inclined crack. A parametric study demonstrates that properties of the wall and the soil have a significant effect on the damage behavior of the wall. Also, creep deformation of the dam body does not elongate the crack significantly, but it expands the width of the crack. The crack tends to stabilize over a period of time.

中文翻译：

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基于离心机和数值模拟的滑坡坝防渗墙损伤分析

摘要 混凝土防渗墙最近被用于滑坡坝作为防渗措施。由于它处于复杂的加载条件下，墙体可能会受到非弹性应变并有开裂的可能性。进行了几次离心机模型试验和数值模拟，以研究防渗墙的损坏行为。离心机模型试验证实了基于有限元法(FEM)-近场动力学(PD)多尺度耦合方法对截流墙和整体滑坡坝体中的小裂缝同时建模的数值方法是有效的。在没有上覆填料的情况下，掩埋在滑坡坝中的防渗墙在横向荷载作用下会产生弯曲效应。墙的下部可能有形成由大弯矩引起的裂缝的潜力。墙体处于拉剪破坏模式，带有斜裂缝。参数研究表明，墙体和土壤的特性对墙体的损坏行为有显着影响。此外，坝体的蠕变变形不会显着拉长裂缝，但会扩大裂缝的宽度。裂纹在一段时间内趋于稳定。