Study On Stability Evolution And Countermeasures Of Broaden Slop Engineerings In Mountainous Highway Widening Engineering

The engineering of broaden slop belongs to road widening engineerings,which encounters lots of engineering problems in mountainous regions.Although the road widening engineering have developed for many years,the research of design and goverance in broaden slop projects are still poor,moreover,no systematic theory and methodology have come into being.In this paper,the main purpose is study on stability evolution and countermeasures of broden slop engineerings based on the existing study of broaden slop engineerings and the road widening project practical experiences,which cosidered the plan of single and double lane by using the finite element numerical simulation method.Obtain the following main conclusions:(1)Using the finite element sets up theory model of similar soil slop which mainly contains fully weathered granite strata and strong weathered granite strata.Analysing the mechanism of deformation which is local failure changes to overall destruction.Putting forward the reinforcement measures should focus on toe of slop and body of slop.The retaining measures are anchor anti-slide pile+small duct grouting+anchor bolt frame.(2)Using the finite element sets up theory model of rock slop which mainly contains weakly weathered granite strata.Analysing the mechanism of deformation which is firstly produce joint shear yield,then rock began to slip dislocation and drives the upper slope rock mass deformation failure when excavation face yield reached a certain scale.Putting forward the reinforcement measures should focus on strengthening the structure plane.The retaining measures are anchor cables of a ribbed slap retaining wall+systematic bolts+prestressed anchor cable frame.(3)Using the finite element sets up theory model of double-decked slope which reflects the nature of the soil-rock contacting.Analysing the mechanism of deformation whose yield pulled the rock body deformation,causing the upper soil yield connected the lower part yielded rock with slop toe excavation,showing a characteristics of the circular arc-step type rupturing.Putting forward the reinforcement measures should focus on strengthening upper soil strata and controlling structure plane deformation.The retaining measures are anchor cables of a ribbed slap retaining wall+systematic bolts+anchor bolt frame.