Study Of Treatment Technique For Soft Foundation And Slope Failure On Plateau Section

The highways play an important role in advancing society and economy development. The construction of highways relays on the research of two key techniques: soft foundation treatment and stabilization of side slope. For the highway through wetland on plateau, because of the effect of environmental climatic conditions and complexity of topography geologic features the two problems are special outstanding.There are several notable features for highway construction in wet-upland. The first, the soft foundation comprises peat bed, besides possesses characteristic of high water content and low strength. Secondly, because of the effects of geology structure and man-made disturb, the failures of bed road and side slope are easily induced.In this paper, based on the main geologic features of wet-upland area, combined with the construction of Lao-Ji highway and used field test and numerical analysis, the construction technique of highway in wet-upland is studied. These questions are researched as follows:1,Combined with the main geologic features in wet-upland area, composite foundation of gravel pile is used to improve soft foundation. Based on field test, the action mechanics of gravel pile foundation is studied by FEM;2,The effect of engineering geophysics on quality inspection and failure reason investigation of slope and bed road is studied. The feasibility of quick inspection of bed road quality using gravity sounding and engineering geophysics is researched;3,The engineering properties of expansive soil is poor, and its weakness is usually the internal reason for slope failure. Considered the suction effect, stability analysis method of expansive soil slope is studied;4,Reactivation of landslide give native effects on the slope stability. Used the FDM, the reason of landslide reactivation for embankment construction is studied.The results show that the construction techniques of highway in wet-upland area given by this paper can satisfy the demands of design and construction. They are beneficial for ensuring engineering quality and speeding construction progress.