Research on calculation method of double-row anti-sliding structure under sliding surface

The method of structural mechanics that bridge used in multi-row piles is introduced to the double-row anti-sliding piles. But it is different, that above the slide surface there exists sliding soil body; however above the scour-line of bridge doesn't consider the influence that the soil body's existence on the "m" method. In this paper, two new "m" methods are proposed which consider the existence of sliding soil body. At the same time, the soil pressure on the piles of front-row and back-row aroused by the soil body above slide surface are researched with tests and theoretical analysis; the calculation formulas are proposed. At the same time, the finite staff element method is used to analyze the influence of beam rigidity; and the two new methods proposed are used to analyze the influence of connect way between piles and beam; and the conclusion is obtained that the rigidity ratio between beam and piles being 0.48 is appropriate; the continuative increase of the rigidity ratio is not significant; the worst condition is that connecting way between piles and beam is hinged; the best condition is that connecting way between piles and beam is rigid. Whether is single-row pile or are double-row piles, when the front of single-row pile or the front of the front-row pile( in the double-row piles) needed excavation, it is supposed to that ought to be carefulness to excavate, because it is that the engineering cost increased greatly. And it was considered that the double-row piles cost saving and had strong capability of resisting deformation; it is worthy of research and extensive application to engineering.