Study On Anti-Slide Analysis And Centrifugal Model Test Of Small Diameter Steel Tubular Anti-Slide Row Piles

Small Diameter Steel Tubular Pile is generally inserting pile or bored bottling pile which the diameter is less than 300mm. Connecting firm the pile top with rigidity girder, it become row piles which change the singe cantilever beam bearing bending moments to a total body bearing bending moments. As a result, the row piles are provided with a better whole stability, bending moments capacity and anti-twists ability. In recent yeas,as a new type of slope supporting structure, Small Diameter Steel Tubular Pile has been widely applied in slope reinforcing engineering.furthermore, good engineering and economic effects have been produced by using Small Diameter Steel Tubular Pile. However, little theoretical studies have been done on the anti-sliding mechanism of Small Diameter Steel Tubular Anti-slide row Piles under lateral loads. One of its construction technology, and the deformation of carrying capacity and other aspects have not yet fully understood, nor a mature theory. The phenomena that design on no theory and generally based on analogy or comparison with existing projects have become a stumbling block in promoting and application of this anti-slope structure. In view of the research situation at home and abroad , it is an urgent task to start researches on design theory of Small Diameter Steel Tubular row Pile. Collecting data on application and theory calculation of Small Diameter Steel Tubular Pile and combined with practice and centrifugal model test,in a word, the main contest and achievements of this paper as following:This thesis not only introduces the historical development and present application and researching status of Small Diameter Steel Tubular Anti-slide row Piles at home and aboard, but also analyzes and summarizes the mechanism of reinforcing slope, capacity of anti-slide, and design method and construction technology. And more, this thesis attaches emphases to analysis difference between Small Diameter Steel Tubular Anti-slide row Piles and traditional anti-slide pile, which include grouting reinforcing, efficiency of pile groups and rigidity girder action. Had done this work, it aims that we can obtain an in-depth study on capacity anti-slide and invalidation mechanism of Small Diameter Steel Tubular Anti-slide row Piles, and as more, make suitable theory and analysis methods for engineering case.On the basis of reasonable hypothesis and simplification, a new analytical model of Steel Tubular Pile system is proposed. the model is combining the mircropiles and the rock mass among the piles as a whole structure and The interaction between the piles and rock mass can be simulated with this model. Soil between row piles was regarded as a thin compressible layer and was simulated by a series of horizontal rings connecting the row piles ,so that the effects of the change of soil profile, compressiblility and the treatment of soil between row piles on the interaction between row piles couid be considered in the analysis with no supposition of the sharing of total soil pressure between row piles needed. The calculated results of the model shows that satisfactory result can be obtained and can be used in the similar engineering.It designed and made the Small Diameter Steel Tubular Pile centrifuge test model prototype to Guangyuan-bazhong speed road research projects. Nine groups of centrlfugal model test were designed to satisfied with distinct experimental aim through different combination of the pressure and deformation influence factors. ln this text, the new ideas lie in thinking of centrlfugal model test as the way to study the anti-sliding mechanism of Small Diameter Steel Tubular Anti-slide row Piles, The study results can guide practice, with some theoretical and Practice significance.