Analysis on Stability Growth of Ancient Landslide Based on Drainage Consolidation Effect
The K244 landslide of Jingzhu Expressway Hunan Section is a large-scale soil highway landslide formed by the revival of a giant ancient landslide induced by road cutting excavation in the rainy season.The external cause of the landslide is the excavation of road cutting and rainfall infiltration,and the internal cause is the existence of continuous cut-through slip zone and bearing groundwater in the ancient landslide.Highway landslide tends to be stable after drainage and anti-sliding support treatment,and the prestress of anchor cable in the support structure slowly decays.Based on the regeneration mechanism of drainage consolidation strength of soil in the slip zone of highway landslide and ancient landslide,the multi-section and inverse algorithm for the regeneration strength parameters of the slip zone soil is proposed.The calculated strength parameters above water are larger than those below water,and the characteristics of the strength delamination are obvious.After many years of dewatering in the drainage corridor,the strength parameter of the soil in the slip zone above the water surface increases obviously,and the long-term stability coefficient of highway landslide treatment can be calculated.Considering the reduction of landslide thrust due to the regeneration of drainage consolidation strength of soil in the slip zone,it generally accords with the law of prestress loss monitored by anchor cable for a long time.After landslide stabilization,corridor drainage promotes the stability growth of landslide in a slow and continuous process,which accords with the characteristics of soil strength regeneration in the slip zone.
ancient landslidethrustdisplacement monitoringinverse algorithmdrainage consolidationstrength coefficientlong-term stability
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