Site Classification And Evaluation Of High Way Slope At East Of The North China

Highway slope site classification is the primary aspects of selection in plant and technology model, which is directly related to the science and rationality of project implementation. In order to prove the pertinence of slope vegetation measures, match the green engineering methods better, reduce project costs, improve the rate of survival and preservation of slope vegetation, the highway slope at Eastern North China was studied on the basis of geomorphology, botany, ecology and soil erosion principle. Field slope investigation and laboratory test analysis of each site factors were combined to filter out the dominant factors. Then based on the analysis of variance, multivariate statistical principles of factor analysis and cluster analysis, the site types of highway slope were divided. Considering the slope characteristic factors and other site factors, the site quality evaluation was made by the mean square error of the decision analysis. The result of site quality evaluation was verified by the investigation of slope vegetation one year later.(1) Jingcheng (Beijing to Chengde) highway (Shayugou to the city boundary) slope located in the mountains of the eastern part of North China, Langzhuo (Langfang to Zhuozhou) highway slope and Jingshi (Beijing to Shijiazhuang) two-channel highway (Dayuancun to the city boundary) slope located in the eastern plains region of North China were studied.112slope plots were selected to be field investigated and laboratory tested analysis. Selected by qualitative factors, the six highway slope site type groups were determined:plain soil embankment slope, plain soil cutting slope, mountain soil embankment slope, mountain soil cutting slope, plain rock cutting slope, mountain rock cutting slope. Then the dominant factors were screened. After cluster analysis, the six highway slope site type group was divided into24site types of highway slope.(2) The method of variance decision analysis was used to determine the weight of different slope site type indicators. Then based on the standardized value of the site quality evaluation data, the use of weighting coefficients and evaluation score table, a different highway slope comprehensive evaluation was obtained. In plain soil embankment slope, site quality of17%slopes is good, and site quality of another83%slopes is moderate; in plain soil cutting slope, site quality of50%slopes is good, and site quality of another50%slopes is moderate; the mountain soil embankment slope, site quality of100%slopes is good; the mountain soil cutting slope, site quality of50%slopes is good, and site quality of50%slopes is moderate; plain rock cutting slope, site quality of67%slopes is good, and site quality of33%slopes is moderate; mountain rock cutting slope, site quality of50%slopes is good, and site quality of50%slopes is moderate site quality. No slope with excellent site quality and no slope with poor site quality. Most of the slopes are the slopes with good or moderate site quality which need to be improved. Finally, the vegetation was investigated to verify the accuracy of the slope site evaluation.