Study On Stability Of Superhigh-filled Embankment Slope Under The Impact Of Multi-storey Highway Loads And Variational Water Level

With the rapid development of china economic and the actualizing of WestDevelopment Strategy, the construction of highway is transferred into the mountainousarea in China. Because of the complex mountainous terrain in west china, and V-gulliesslope is generally steep, High fill subgrade of Badong formation geologic is inevitable.The superhigh embankments in Three Gorges reservoir are usually effected by the waterlevel fluctuations of the Yangtse River or its tributary. And there is probablyarrangement of two or more than two roads at the same superhigh embankmentsregional, so the same roadbed will be under the multi-storey vehicle load. Combinedwith Supported by Program for Changjiang Scholars and Innovative Research Team in University(IRT1045)， stability of superhigh-filled embankment slope under multi-storey loads andwater level fluctuations is studied in this paper. The main research work contains:⑴through the Badong formation geologic packing indoor tests to get modulus ofresilience, cohesive force and some other parameters that calculation on the theortucalanalysis needed.⑵The paper researchs how to handle the road vehicle load by two kinds of forms(equivalent to equivalent soil column thickness and equivalent to uniform load), and doa comparative analysis about the treatment effect. Analysis shows that stability resultsthat we get from the two kinds of forms of treatment is close, and the way of equivalentto uniform load is slightly more accurate than another.⑶Then this paper calculated slope stability of different height and gradient by thelimit equilibrium method and the numerical analysis method, and obtained the slopegradient value, high value on high slope stability influence: the increase of the slopeheight or slope grade of slow, vehicle load impact on slope stability is also smaller;when the vehicle loads act on the middle of the slope protection road, the effect on thestability of the slope is greater than the vehicle load arrangement in the subgrade top. Ingeneral, relative to the weight of the embankment the influence of vehicle load ofembankment on slope stability is very limited.⑷This paper analyzes the stability of variational water level V-gullies of the highfilling subgrade later, and established the V-gullies superhigh-filled embankment invariational water level and water level dip cases of saturated-unsaturated seepage andstress coupling calculation model. This paper arrive at the stability change rule of V-gullies gully under superhigh-filled embankment slope in different variational waterlevel range, also got the displacement and stress change rule under the action offlooding retaining wall in variational water level. In order to deal with the variationalwater level damage, measures and suggestions are given to the real engineering slopesand retaining wall reinforcement.⑸This paper finally chose two typical section at Fengjie east interchange, get thedisplacement and verify the strain data under numerical analysis by geotechnicalcentrifuge experiment.In brief, the stability influence rules of the multi-stage vehicle load and variationalwater level under the superhigh embankment slope to Badong formation geologicalpacking is concluded in this paper.