Loess Area Highway Slope Protection Program Optimizing Selection

The thesis brought forward a calculated system for loess slope synthetic protective scheme. The research of the thesis aimed at high slope of the highway in loess land, depended on spot investigate, field sampling, indoor and outdoor examination. The system proved by entity engineering, with the consideration of loess circumscription engineering geology characteristic, high loess slope the former with geologic structure, slope appropriate slope type and shield technology for loess slope.The loess area was divided into southeast area, central section area, west area and north area according to the rule of territorial variation with loessial physical mechanical property, territorial climate difference, climate symbol, geography-physiognomy difference, the characteristics of the loess land geology, and the principle of territorial programming with ministry of communications.Probed to the constructed high loess slope of the highway, the loess land was verified into eight kinds according to the subarea principle of the former with geologic structure, and considered the frame combination of the shape with unilateral slope or multiattribute slope. The eight kinds of geological structure model are latest loess singularity frame, latest and former loess model, former loess singularity frame, former and ancient loess, former and red clay, former with rock, latest loess and terrac alluviurn, former loess and red clay with rock frame. At the same time distributing rule and feature for the former with geologic structure was summarized, it has the most important practical signification with the analysis of the stability and protective design for the slope engineering.The stability of the different type of loess high slope is analysised and estimated. the reasonable design scheme on high slope of the highway is brought out combination with the former on geologic structure.In the thesis, the detective measure, the detective slope technical and the step for drainage have been studied deeply. In the end, the new style complex zoology technology and geocomposite technology are put forward. The complex detective design on highway slope is put forward combination with geological structure model relating to different engineering geological area. It has great significance use for reference to the detective design of loess area.In the end, the optimization and the choice of scheme design are put into forward on the loess highway slope applying fuzzy synthesize by selecting integrate slope ratio, the geological structure model, slope height, slope shape, rainfall and constructing condition as optimize factor.