Taking the K39 landslide of Wenshan-Malipo Expressway as the research object,the location of the multilayer slip zone of the landslide was identified,the motion characteristics of the slide and its relationship with environmental factors were revealed,and the deformation and stability response characteristics of the landslide under the conditions of different phases of anti-slip pile engineering were evaluated by combining with finite-difference numerical simulation calculation method.The results show that the K39 landslide has multi-phase composite landslide characteristics,the excavation of the rock and soil body at the foot of the slope is the main controlling factor leading to the resurrection of the landslide,and rainfall is the main factor affecting the stability of the landslide,and the excavation at the foot of the slope leads to a significant reduction in the anti-slip effect of the leading edge of the landslide.The landslide deformation decreases significantly after adopting the"anti-slip piles+retaining wall"engineering management,but the anti-slip piles still have slow deformation,and the landslide is in an unstable state.After the second phase of anti-slip piles,the stability coefficient reached 1.63,which meets the requirement of the safety coefficient,indicating that the stability of the K39 landslide after two phases of anti-slip pile management is very good.
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