Study On Correlation Between Rainfalland Loess Landslides In Yan’an

Geological disaster is an important part of natural disasters, and it often brings theserious influence to social economic development and human lifes. Yan’an City is located inthe northwest China, belongs to the loess plateau, with lots of geological disasters. However,for geological disasters induced by rainfall is in the particularly crucial role, In order tofurther analyze the impact of rainfall of geological disasters, I participated in the " Thedevelopment features and distribution of geological disasters in Yan’an " project, launchedYan’an City the correlation between rainfall and geological disasters, The main researchcontent is as follows:(1)Through a detailed investigation of geological disasters and the meteorological data,study the relationship between the rainfall and the distribution of geological disasters in timeand space in Yan’an.(2)Combined with the characters of the slope in Yan’an and soil information, designingFour types of slope model: pure loess, loess-red clay slope model, pure loess slope modelwith the pore and the loess-red clay slope mode with the pore.(3)According to the detailed investigation of the geological disasters in all the area of theyan’an, and Combined with the reality information of yan’an regional geology and experimentof the soil, getting the soil physical and mechanical parameters.(4)Using SEEP/W and SLOPE/W module in the Geo-studio software to analyze the fourslope model, to get the result of the seepage analysis and stability analysis, which will provesthe effect of rainfall on slope stability.(5)Rainfall with the examples to demonstrate the process of slope instability and to verifythe correctness of the formation mechanism.The above search has reference value to the studies of the formation mechanism ofgeological hazards in Northern Shaanxi region. And it has guiding the significance for theplanning of Geological disaster and disaster prevention in Yan’an.