The Research On Planning And Stability Of Discarded Soil Field For Highway In SanXia Area

With the protection of "the12th five-year plan" and "the western development strategy" in the country,The construction scale of highway has been rapid development in this stage.For the balanced development of national economy and solving the problem that traffic condition is very poor in some area where have a less economic development,Building highway in the mountainous area gradually become the focus of the highway construction in our country.However,restricted by the climate,geological environment and ecological conditions of mountainous area,the scale of tunnels excavation project could be far more in mountainous area than in general area.A number of excavation engineering would inevitably produce a lot of discarded soil.Therefore,Derived from the need to dealing with the soil,a large number of discarded soil field need be built in mountainous area.But the lack of scientific and systematic criterion of location planning and stability evaluation leads to a series of problems,such as soil erosion,landslides and another secondary disaster problems.Occurred frequently of these accidents in recent years has aroused great attention of the state and society.Based on the above problems,this article appropriates the discarded soil field of highway which is from Yi-chang to Ba-dong as the researching object,and use a variety of methods which include site investigation,data collection,test analysis,remote sensing image analysis,GIS spatial analysis,grain flow theory,the finite numerical simulation technology and theory of interpretation to research on the planning technology,parameter inversion and stability evaluation of discarded soil field.(1)On the basis of economic factors, topography conditions, environmental factors,discarded soil field location planning was realized though remote sensing image processing and GIS spatial analysis technology.Application example proved that compared with the traditional site selection planning method,the the planning technology based on remote sensing image processing and GIS spatial analysis technology is more scientific and reasonable,and it has more important significance.(2)As the important parameters of soil strength,mechanics parameters as the important parameters have a effective meaning to evaluate the strength and stability of soil.However,the mechanics parameters soil which is used of serval materials have great differences with the soil which is used of single material.In order to inverse and calculate the mechanic parameters of the mixed soil more accurately and quickly,the software PFC3D was applied to simulate the triaxial shear test of the mixed soil which is used from different material and content based on particle flow theory.and the simulation results are compared with the laboratory test results,it shows the simulation results have a good correlation with the laboratory test results,which verifies the applicability of the model,while the virtual test method based on this model can be established to inverse and calculate the mechanic parameters of the mixed soil.(3)As a kind of external dynamic load,blasting has a very important impact on the stability of discarded soil field,but there are little researches for blasting dynamic loading currently.In order to make up for the vacancy,this article use Ansys/Lsdyna finite element simulation technology to inverse blasting dynamic loading on the survey region,and according to the monitoring data of the blasting, the blasting dynamic loading have been corrected.Based on the data,establish FEM numerical simulation model of discarded soil field,then,calculate on the slope in the dynamic load.The result provide certain reference on the same problem of slope dynamic load.(4)Using the developed FDM(Finite Difference Method),the numerical simulation for discarded soil field deformation under different rainfall infiltration depths are conducted,and the results of numerical calculation are compared with those of the laboratory model tests. Then the influence law of rainfall infiltration depths on the road-embankment slope stability and sliding arc changing characteristics are analyzed by strength reduction finite element methods.In this article,the outcome of institute can be to further improve planning technology and stability evaluation methods of discarded soil field Mountainous freeway,as well as provide a reference and guide for projects on how to reduce disaster and enhance rational use..