Research And Application Analysis Of The Hemi-slope Pile Design Key Parameters

High slope and landslide engineering problems often encountered in the process of the construction of the mountain road,and the semi-slope pile has the advantage of high slope protection and landslide under the condition of limited space conditions.The practice of semi-slope pile is far ahead of theoretical research,design and calculation theory is far from perfect,there are many problems that need to be further studied and solved.Compared with the ordinary anti-slide pile,the semi-slope pile is mainly located in the middle or upper part of the cutting slope,or is located in the steep embankment or slope embankment,the pile front slope rock and soil are generally broken,its own stability is usually relatively poor,in front of the pile slope or steep slope.hat is to say,the anchorage segment of the hemi-slope piles are in the non semi-infinite rock mass,its deformation and failure mode are a far cry from those of ordinary anti-slide piles in the infinite half-space,which is mostly to do with such aspects that the security platform width of the anchorage segment rock before piles and the depth of the anchorage segment is not enough and the wedge within a certain range will tend to slide under the soil pressure of the rock before the piles.In order to solve this problem,thesis by theoretical analysis methods combining with the field test and research and on the basis of design methods and theories of the traditional anti-slide piles and analysis of the force of the hemi-slope piles.The results indicate that if it can be ensured that anchorage segment rock mass before the hemi-slope piles has enough security platform width,making it possible that the rock mass before anchorage segments is approximate to the infinite half-space elements,is the key design parameters to influence whether the design of hemi-slope piles is successful or not.With the use of calculation model of the wedge combined with the equilibrium equation in mechanics the thesis,has summarize the calculation formulas of the safety width of setting hemi-slope piles in the middle of the cutting rail or on the steep slope embankment.And it analysis problems of results being lager in the calculation formula of setting hemi-slope piles on the steep slope also proposing revised schemes.According to the calculation formula of the safety width,the thesis uses the analysis method of the sensitive factor to analyze the influence parameters,determining the sensitive degree of all factors.Considering the limitation of site conditions,topography,stratum lithology,the thesis puts forward the applications range of the formula on the project of hemi-slope piles protecting side slopes and treating landslide.Finally,combining with the project problems of the K2+080-160 section of the western north loop in Lanzhou,it puts forward two design schemes to make comparison and analysis,indicating that the scheme of hemi-slope piles has obvious advantages on such aspects as the economical efficiency,construction difficulty,convenience of solving problems.The research results have important guiding significance for the design and construction of slope stability.