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Debris flow is a serious disaster which always leads to huge damages in Taiwan. After typhoon or downpour, the fluid pressure and the impact of the huge rocks and floating woods brought by debris flow may contribute to structural damage of bridges, or damage the bridge base which is attributed to the washout of the riverbed. These phenomena would seriously influence works concerning shelter-seeking and damage-relieving. Case studies in this research consist of two phase. For the first phase, data of debris flow cases such as typhoon and rainfall information Kaohsiung Baolai No.2 Bridge in Taiwan as case in 100/200 years return flood peak flow. Numerical simulation was performed using SMS-2D, result were presented in the main deep trough and area. For the second phase, this study designed a checking evaluation procedure of concrete cracking failure of foundation of bridge by using mathematic algorithm. This author certainly expects this procedure could be a further reference for pier and foundation of the bridge design.

Investigation of Piers Suffered Landslides Impact on the Main Deep Trough of River Bed by 2D Unsteady Flow Simulation