Computation and design methods of energy dissipating pile against landslide debris flow
Landslide debris flow usually causes serious natural disasters in lower regions because of their enormous volume,rapid velocity and long-runout distance.Based on the dynamic interaction between energy dissipation piles and landslide debris flow,the theoretical calculation model of energy dissipation by piles is deduced by utilizing the power principal and structural mechanics method.Firstly,the vertical distribution of the impact force of landslide debris flow is obtained by calculation.Secondly,the bending force is determined according to the relation of the bending deformation of cantilever beam.Then,the spreading area and thickness of the granular flow on slope surface are used to estimate the distance that the deposits passed over the piles.Finally,the kinetic energy dissipation of every pile is computed.The optimized design of the energy dissipating pile is carried out through the derived formulas:taking into account the position of the objects to be protected and the accumulation area of the landslide.the energy dissipating benefit and the number of piles are calculated.According to the impact force of the maximum stone,the number of rows of piles is calculated to decide the layout design of energy dissipation piles.An idealized landslide is taken as an example to illustrate the use of the proposed theoretical methods.The results show that the method can be used for the optimization design of energy dissipating structures against landslide granular debris flows.
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