Stability Analysis Of Soil Slopes At Lanzhou-Haishiwan Highway And The Application Of The Prestressed Anchor In Engineering

Highway constructions in mountainous areas encounter a large number of slope engineering. Due to lack of understanding slope failure mechanism as well as the ineffective reinforcement measures, there are often a number of engineering problems and a waste of resources. Lan-Hai (Lanzhou to Haishiwan) Expressway facing a number of slope engineerings which are large-scale, complex factors and variable geological environment during the highway construction process, commonly appeared problems about the stability of high and steep slope and landslide issues of large-scale disasters. These slope stability projects, even the stability of local projects, to a great extent, effect the investment and use benefits. At present, however, domestic researches on anchorage technology have primarily focused on the rock slope, the researches on anchoring mechanism of soil slope (especially some new anchor measures, such as prestressed cable anchor beam, etc.) are deficiency, most of its applications are based on empirical.The styles and the mechanism of downslides are analyzed in details, in the same time, putting forward to the basic principles to calculate the downslide strength, keeping the calculation method more consistent with the stability analysis method, which ensure keep the result of the downslide strength caulated the consistence with the corresponding stability parameter, and derived the internal force calculation model of the anchor rope ground beam and parameters such as the anchorage of slope simplified model, etc.Aiming at the characters such as complex construction and high technical requirements of prestressed anchor cable, the paper analysis the main issues and points for attention during the construction process, taking relying project-high slope diseases regulation project of K21 section in Lan-Hai Expressway for example. Combined with the basic theory of anchor cable reinforcement, the paper systematic research on disease regulation process of the complexity high slope, and put forward the corresponding technical parameters and safety measures. Through the scene cable anchor pullout tests and anchoring effect analysis after construction, it showed that good effect for engineering application, which can provide parameters of the anchor design for such slope.