Disaster Prevention And Reduction Design Principle Of Bridges On Mud Rock Flow Occurred Regions

In Southwest of China, debris flow is a relatively common form of geological hazards. Debris flow erupts suddenly, has strong intensity and destructive power. It has a significant impact on safety of bridges built on mud-rock flow regions. Hence it’s important to study the role of debris flow on the bridge. Role of debris flow on the bridge is a relatively complex process. On the one hand the complex rheological properties of debris flow itself need to be taken into account, on the another hand the diversity of bridge structures and their static and dynamic analysis of interaction need to be considered. According to different bridge structures in different areas, determination of disaster prevention and mitigation programs provided.This article mainly from the following several aspects to research area debris flow disaster prevention and mitigation of Bridges design.(1) Study the basic characteristics of debris flow. The environment in the area where mud-rock flow is liable to occur, the scale of debris flow Probability analysis of the debris flow The physical parameter of debris flow, including Bulk density velocity and viscosity and then by these parameters to calculate the debris flow of the role of a bridge..(2) Study of debris flow damage on bridges Main function modes of debris flow on the bridge, Issues to be considered when designing a bridge in the area where mud-rock flow is liable to occur, design principles of disaster prevention and mitigation, and design requirements of bridge performance are studied.(3) Simplified calculation method of debris flow. In order to facilitate modeling, main factors are considered, and the appropriate model is simplified. Debris flow in this paper will be viewed as purely materialistic Bingham, the debris flow interaction of internal material is ignored, and impacts of mudslides and washes the Eclipse, embedded are calculated. Calculating the displacement and stress of bridge and bridge’s stage of damage under the effect of debris flow.(4) In this thesis, simulations of impacts of debris flow in different intensities on piers of different forms by ANSYS Workbench are conducted.Effects of debris flow on bridges belong to the coupling Calculation. For the bridge, we have to consider the different degree of debris flow, in order for calculation analysis of bridge safety. For the fixed strength of mud-rock flow, we need to consider reactions of different bridges, in order to determine the bridge type and the form of cross section.(5) Debris flow washes and erodes the soil around bridge.By settings of shear strength of soils around the bridge and debris flow intensity, ANSYS Workbench is used for static calculations, and depth and scope of damage by mud-rock flow destruction on surrounding soil of bridges are understood.