Study On The Geomorphological Evolution And Scene Prediction Of The Landslide In Heitai Platform

Due to the large-scale agricultural irrigation in the Heifangtai area,the groundwater level in the platform area has been greatly increased,which has induced a large number of landslides.Different scholars have carried out a series of research work for this purpose.In this paper,through field investigation and remote sensing interpretation,it is found that the current Heifangtai loess landslide has vertical multi-period and lateral mass morphological evolution characteristics,which is of great significance for the evaluation of loess landslide disaster.The change of topography and geomorphology will destroy the original hydrological balance in the study area and change the conditions of landslide occurrence.Therefore,how to evaluate the balance between landslide evolutions and hydrological dynamic evolution is the key scientific problem for predicting the equilibrium condition of landslide geomorphology.Taking the evolution of the landslide geomorphology of the Heifangtai platform as an example,this paper first discusses the rise of the groundwater level in the past 40 years.Based on this,by summarizing the landslide evolution model and using the groundwater numerical simulation technology and the ARCGIS platform,the dynamic response law of groundwater in the reclamation area after landslide occurrence is revealed.It is found that the water level change and the landslide accumulation quantity have peak characteristics,that is,the two peaks.It has a positive correlation,but with the occurrence of landslides?post-peak stage?,the groundwater level gradually decreases,showing a negative correlation.At the same time,it is found that the hydrological response is more obvious under the horizontal evolution mode.The stability of the slope under the lateral evolution mode is analyzed by FLAC3D software.This paper mainly draws the following conclusions?1?The types of loess landslides developed in the Heifangtai area are:loess flowslide,loess sliding,loess-mudrock plane landslide,loess-mudrock interface landslide,loess-mudrock incising landslide and loess flowslide are the most widely distributed types of landslides in the study area.And the greatest harm.?2?The simulation results of historical hydrodynamic field show that the groundwater level has risen significantly since the 1970s,especially in the first 20 years,the groundwater level has increased by more than 20 meters.After the 1990s,the rise of groundwater has become slow,rising by about 0.15m per year.The rise shows the fastest rise in the east,and the diving layer flows from west to east.?3?The landslide development pattern in the study area shows a pattern of longitudinal evolution and lateral expansion.Under the two landslide modes,the groundwater generally shows the trend that the water level rises first and then falls.According to the model,the final remaining area of the loess platform in the study area is less than 7.8km^2.?4?The vertical and horizontal and horizontal evolution modes of the Heifangtai landslide are distributed and accompanied.The initial stage of landslide occurrence always shows the longitudinal evolution characteristics,but when the longitudinal landslide occurs to a certain extent,large cracks will be formed at the trailing edge of the landslide,and lateral evolution will occur.The lateral evolution has a more significant impact on the black station water level process.In this evolution mode,the landslide in the study area can reach equilibrium more quickly...