Analyses of common problems in survey and design of mountainous expressway slopes

There are many consequent slope, creep deformation slope and steep countertendency slope during the construction of mountainous expressway. To consequent slope, whether slightly steep slope should be reinforced or slightly slow slope should not be reinforced, the slope expert may give corresponding method which is based on control layer, the engineering geology condition and characteristics. From the devolution of red sandstone tendency and dip angle showing in site, we make conclusion that the slope is a creep deformation slope which is based on many researches on rock characteristics and back analysis of characteristics about slide surface; we emphasize the importance of pre-reinforcement by anti-slide pile; and it is approved by real deformation failure that the analyses and methods made by slope expert is correct. For red sandstone steep countertendency slope, the rock mass strength changes with the infiltration of rainwater for the existence of weak intercalation and joint; and it is important to reinforce the slope which had been in dumping deformation. The slope expert can make comprehensive analysis on the characteristic changing and control factor on stability, and make reasonable engineering method which may reduce the engineering loss.