| In this thesis, the author takes the territory of Yingjiang highways slopes, Yunnan as the research object, the important under building provincial road and important rural road slopes as research units, through investigating the nature of the local rock and soil slopes, done physical and mechanical properties testing of rock and soil samples, drawing the maps of slope profiles, drew a engineering geologic map of Yingjiang and surrounding areas by using mapgis. and then use the large-scale geotechnical engineering analysis software FLAC3D on the research of stability in the earthquake, got the awarenesses and main conclusions as follows:(1). There are a lot of bare excavation slopes in the research area, most are in the granite region, and the weathering degree is different, most are strong or weathered.(2). Through the collection of seismic data, done the statistical analysis by the software mapsis developed by the China Seismological Bureau, got the conclusions that earthquakes frequency have tended to increase since 2008, there are 4 times Ms≥5.0 earthquakes, and all are shallow earthquakes which depth of hypocenter are less than 10km, and has strong destructive influences.(3). The author finished the numerical simulation of Teng-long highway "large turn style slope" and Xi-ma highway "small turn style slope" under earthquake situation by the FLAC3D software, the results showed that:the two types of slopes reached maximum displacements of 10.20cm and27.07cm under the earthquake which GPA 0.046g, the bottom is the weakest part, small-scale landslide will occur; the two types of slopes reached maximum displacements of 2.75m and 2.86m under the earthquake which GPA 0.134g, "traction-style landslide" and "pushing-style landslide" will happen.(4). The author finished the stability calculations of various kinds of slopes. Concide the slope and slope height factors from a practical point of view, found slope and slope height have greater impacts. the results showed that:under the earthquake which GPA 0.134g,the steeper slope (75°) is easier to occer the "pushing-style landslide", the higher slope (40m) is easier to occer the "entirety-style landslide". So the author proposed to take the method of cutting slope and unloading to improve its stability when cutting highway slopes in the region, namely slowed down the slopes and lower slope heights. |
