Study On Formation Mechanism Of Typical Landslide In Lvliang Mountain Area

The landslide is a major geological disaster in the Lvliang area of Shanxi Province,and it has also caused huge economic losses and casualties.However,this threat has not disappeared.Therefore,in order to be able to ascertain the regularity of the landslide in this area,it is the prevention zone for landslides.With a certain guidance,the work of this article was carried out.Through the analysis of historical landslide data,on-site survey and indoor analysis,three major contents were carried out: understanding of engineering geological conditions in Lvliang Mountain,Shanxi,analysis of historical geological landslides and numerical verification of typical landslides.The engineering geological conditions in the Lvliang Mountainous Area of Shanxi are only used as background information to confirm the possibility of occurrence of landslides.The three major topographical features in the area: the plain basin area,subject to flat topography,no matter what lithology is difficult to form a landslide;in the bedrock mountain area,the exposed bedrock is mostly stable lithology,and it is difficult to form a landslide;the Loess Plateau area The steep landform formed by erosion covers the landslide-prone landslides such as loess and the third-line red clay.It is a landslide-prone area.According to the historical geological landslide data,according to the induced factors and certain stratigraphic differences,it is divided into four types of landslides: erosion landslide,excavation landslide,rainfall landslide,goaf landslide,and studied separately.Various types of landslides.Erosive landslides mainly occur in the loess layer,usually due to erosion damage at the foot of the slope.Using the Rapid landslide motion analysis and the stability of Geo-studio to analyze a typical landslide in Hexi Village,it is found that the slope of the eroded slope before the landslide is started.The maximum shear strain increases significantly.After a period of accumulation,it starts with the significant movement of the slope foot until it finally stops.The excavation type landslide mainly occurs in the loess-red soil layer,usually due to the excavation of the slope foot.Rapid landslide motion analysis and Geo-studio stability analysis of a typical landslide in Hexi Village.Before the landslide is started,the maximum shear stress of the loess in the upper part of the slope is significantly increased,the stability coefficient is also reduced,and the upper loess layer will be the first to slide.The lower red soil layer slowly destabilizes under the action of the upper loess and slides together;the rainfall type landslide mainly occurs in the loess-bedrock,usually due to the instability of the slope caused by rainfall,and the analysis of the Hee by Geo-studio A typical landslide in Juyi Village,it is found that under rainfall conditions,rainwater is rapidly concentrated in its underlying stratum as an impermeable layer.At the same time,the water begins to flow along the impervious layer,and the soil becomes unstable.The goaf-type landslide mainly occurs in the loess-rushing layer,usually caused by ground deformation caused by mining,and is analyzed by MIDAS.A typical landslide in Caojiata Village,after excavation on a more stable slope,due to stress concentration,the maximum principal strain begins to appear in the upper part of the goaf,and the goaf is deformed and further expanded to form a more In the case of large underground space,the upper slope will produce a large shear strain in the relatively weak formation,and finally a through-slip surface will be formed,resulting in instability of the slope.In summary,it can be seen that the Loess Plateau region in the Lvliang area of Shanxi Province has become a high-incidence area of landslides due to its steep landform and lithology.According to the predisposing factors,these landslides mainly include erosion landslides,excavation landslides,rainfall landslides and goaf landslides.Each landslide exhibits different sliding mechanisms according to different induced factors: erosion landslide and The causes of excavation-type landslide damage are all in the part where the slope changes greatly,and the stress concentration is formed to produce slow sliding;the rainfall-type landslide is mainly caused by the seepage of rainwater along the bedrock surface,and the slope is unstable;the goaf-type landslide is mining.The stress in the empty area is concentrated,constantly deformed,and eventually develops into a landslide.