Dynamic Response Analysis Of Debris Flow On The Pier

Debris flow is frequent and serious natural disaster in mountainous area and the terrain of our country, with the development of economy in the mountainous area and the environmental damage to highway, railway bridges and other engineering facilities, the debris flow disaster probability is also increasing. Mudslides brake out suddenly, and the intensity is strong, devastating, then threatening the safety of the bridge built in the debris flow area. This paper carries out the study of debris flow dynamic response of the piers.This article analyzes the basic characteristics of debris flow firstly, discussing the important parameters of debris flow impact, the density of debris flow and the velocity, the impact of the physical parameters such as the calculation method, the mathematical model of debris flow simulation and the mechanics model, then turbulent process is achieved by k-epsilon model. Secondly, the article simulate the landslides and bridge piers of fluid-structure interaction by adopting finite element software, and select the debris flow as a pure substance bingham body, the finite element model is established, and the dynamic response of the double column pier, solid pier and hollow pier under debris flow are calculated. Finally, according to the simulation of different intensity of debris flow impact of different forms of bridge pier, the article analyzes the pressure, displacement of pier top and pier suffered stress and determine the bridge’s stage of damage under the action of debris flow impact, and engineering control measures are put forward. Finally get the following conclusion:the dynamic response of main piers is affected by the density of debris flow, speed, when the same bridge piers are under the action of debris flow, the maximum pressure, stress and displacement will increasing with the increase of debris flow velocity and the impact head height.