水工栈桥桥墩拆除爆破若处理不当，会对临近的水工建筑物造成永久性影响。通过对石门坎水电站栈桥的爆破倾倒历时及振动效应分析，给出了栈桥倾倒历时的求解公式，并指出了减少振动影响的相关措施。结果表明栈桥倾倒历时的实测数据与理论计算基本相符,爆破未对周边建筑物产生有害影响。

Improper handling of the demolition blasting of hydraulic trestle pier will cause permanent effect on the hydraulic structure. Based on monitoring data and macroscopic survey, the authors analyzed the toppling duration and vibration effect of the trestle of Shimenkan hydropower station, and gave the calculation formula of toppling duration which is an improvement compared with former methods. Measures of reducing vibration effect were proposed. No adverse impact was exerted on surrounding buildings by the blasting, and the monitored toppling duration data generally agreed  with theoretical calculation result.