Monitoring Data Analysis and Reactivation Mechanism Study on Typical Loess-Mudstone Interface Landslide—Taking Daquangou Landslide of S204 Line in Ningxia as an Example
Taking Daquangou loessi-mudstone interface landslide of S204 line in Ningxia as an example,the cause of landslide is analyzed systematically,and the deformation monitoring data during landslide engineering treat-ment are combined to identify the deformation failure mode and characteristics of landslide reemergence.Taking the Ningxia S204 highway Daquangou loess-mudstone interface landslide as a case study,the cause of landslide is analyzed systematically,and the deformation monitoring data during landslide engineering treatment are combined to identify the deformation failure mode and characteristics of landslide reemergence.The results show that the resurrection of such landslides is still affected by rainfall,groundwater and ergonomic activities;The rainfall and abundant groundwater makes the landslide full of water all year round.The rock and soil at the bottom of the lo-ess and the mudstone interface surface has been in a super-wet soft plastic-saturated state for a long time.At the same time,it is affected by pore water pressure,dynamic water pressure and rock mass weight.The overlying lo-ess occurs creep deformation along the soft structural plane with high water content or saturation(loessie-mud-stone interface landslide).Manual excavation of the slope foot shortens and reduces the landslide locking section,causing creeping shear failure of the upper soil to the air interface,and tensile cracking at the trailing edge,which forms a creeping shearing-tensile failure mode.The failure process can be divided into two phases:creep and basic stability;in addition to supporting landslides,the prevention of such landslides should be supplemented by under-ground drainage projects to reduce groundwater levels in order to effectively cure the landslides.
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