Study On The Composite Retaining Structure Of ARC Anti-Slide Pile

According to the statistics, in recent years all kinds of bad geological phenomenon caused economic losses as high as a hundred billion per year on average in our country,and damage proportion of the landslide geological disasters to people’s life and the country’s construction is the largest. Traditional anti-sliding retaining structure in the landslide control has achieved certain results, but still difficult to meet technical and economic requirements of landslide governance under the special geological conditions. So innovating technology of anti-sliding and developing new landslide governance structure under special geological conditions become the urgent task of current scientific and technical worker.For traditional anti-sliding retaining structure in special geological conditions of landslide governance limitations, this paper proposes a new kind of anti-sliding retaining structure which name arc array of anti-slide pile retaining structure, and through the calculation theoretical analysis, model test research, numerical simulation analysis and engineering application research prove its rationality and feasibility. This paper mainly made the following findings:(1)"Deep groove shape" landslide has distinct characteristics, such as the trailing edge assums circular arc form, the slide body is narrow and long, the coating thickness is big, slide force is great, and the bedrock and both sides of the sliding body is stability,which resistance is larger. From the Angle of the working principle of a variety of anti-sliding retaining structure were analyzed, the arc array of anti-slide pile retaining structure is superior to traditional anti-sliding retaining structure in the aspect of mechanical performance, and it is more suitable for this kind of landslide governance.(2) This paper analysis the form of arc array of anti-slide pile retaining structure and its working mechanism. Application of basic principle of structural mechanics, rock mechanics and the theory of anti-slide pile design calculation deduce the theoretical calculation formula of the anti-sliding retaining structure about internal force and displacement, and its rationality was verified.(3) Physical model experiment of the anti-slide pile retaining structure was carried out, the results trend is consistent with the theoretical calculation, the main reason for the difference is that pile head restraint is simplified to hinge in the theoretical calculation, and pile top is bonding together with connecting beam in the model test, and the test model have some differences from the theory.(4) The Abaqus finite element analysis software was applied to analysis the arc arrangement of anti-slide pile retaining structure in the three dimensional numerical simulation, which get the internal force and displacement distribution of anti-slide pile and connecting beam. The compiled result trend is consistent with the theoretical calculation and model test, the reason that there are differences between them lies in the different simplified processing for anti-sliding structure model.(5) Landslide in panzhihua airport share the characteristics of "deep groove type" landslide. Using "arc array of anti-slide pile retaining structure" governance scheme on panzhihua airport landslide enables to effectively control deformation of the landslide, and the deformation of this structure relative to the ordinary cantilever anti-sliding structure is smaller.So the anti-sliding retaining structure can effectively control such special geological conditions of landslide, and it has a certain guiding significance for similar landslide governance.