Slope Stability Analysis Due To Earthquake And Zonation In Loess Region

Because of gully aspect, complex terrain conditions, complex geologicalstructure, fault development, strong neotectonic movement and frequent earthquakes,earthquake-induced and geological disasters occur frequently in Loess Plateau.According to statistics, seismic intensity zone in the Loess Plateau of strongearthquake zone above â…¥ degree is up to335100km2. Under the background of thehigh intensity seismic activity in the Loess Plateau and the light of dynamic fragilityof loess caused by the overhead pore structure and weak cementation, mechanicalproperties of loess will make adaptive changes in the strong vibration due to theaction of the microstructure, and then affect the macroscopic strength and deformationcharacteristics, even leading to instability and failure.In view of the neotectonic movement is active and strong earthquake occurfrequently in the Loess Plateau in China, also because the loess has vulnerablecharacteristics under strong power, dynamic response characteristics, deformationcharacteristics and landslide stability zoning are studied in this paper. In view of theabove problems, the main work in this paper and the conclusions are as follows:(1) Based on research on the disaster investigation, test and dynamic triaxial tests,the mechanical parameters of model soil are obtained.(2) Ideal three-dimensional slope model is analyzed by static numericalsimulation using FLAC3D and the research of stability affected by soil overburdenthickness and slope is made; curves of FOS VS thickness and angle of slope areobtained.(3) By applying Tianshui artificial wave to the ideal model of3D slope, stabilityis calculated and seismic response is analyzed. The results show that, under the poweraction, slope emerge relative displacement and sliding trend; model has the boundaryeffect.(4) Modeling4typical slopes for3D in Tianshui, the stability of model appliedby Tianshui artificial wave is studied and the characteristics of ground motion amplification effect are summarized.(5) By using AHP method combined with GIS spatial analysis, slope stability iszoned; slope stability zoning map of2%,10%and63.5%of three kinds of probabilityare obtained. Compared with the actual disaster information, the results of zonation fitthe actual disaster situation very well.