LANDSLIDE MECHANISM AND TREATMENT MEASURES FOR HIGH FILL SLOPE AT AIRPORT IN SOUTHWESTERN CHINA

A high fill airport in southwestern China suffered a half month of heavy rainfall immediately after its earthwork has been completed. A landslide occurred at 4 hours after the sudden rainstorm. This paper uses the methods of surveillance, detection, scene investigation, in situ tests, laboratory test and numerical simulation and makes a comprehensive analysis. The slope sliding is due to the following aspects. The embankment of dynamic compaction reinforcement destroyed the original gravel drainage layer in the body of the soil surface area. The affected slope area is the ground with gravel filling of cohesive soil. The rainfall can not be discharged from the channel slot area. High groundwater pressure, seepage deformation, soak softening, and others cause the slide. The emergency measures include film covering the top surface of the filling body, network installation graded gravel filtration and drainage on slope water point, sliding slope gravel bags backfill and permanent disposal method of filling the top of cohesive backfill, slope gravel replacement and yang inclined tube drainage. They effectively control the further slump deformation and slide, achieve good results.