滑坡涌浪作用下乐昌峡大坝安全评估

通过物理模型试验,测试了乐昌峡大坝在滑坡涌浪作用下的动水压强。结果表明,各测点动水压强随时间呈衰减趋势,其中首浪到达时产生的初始动水压强值最大,且在静水位以下呈垂直分布。利用该涌浪荷载计算模型,对乐昌峡大坝进行安全评估。研究表明该坝在设计洪水位工况下的安全性不能满足规范要求,必须对滑坡体进行加固处理。

Safety assessment on Lechangxia Dam under surge effect caused by landslide

Through physical model experiment, the hydrodynamic pressure on the upstream face of the Lechangxia Dam under the surge effect caused by landslide is tested. The experimental results show that the hydrodynamic pressures of all the test points present a time-dependent attenuation trend, and the initial hydrodynamic pressure reaches the maximum value, which is vertically distributed under the static water level, when the head wave arrives. With this surge load calculation model, the safety of Lechangxia Dam is assessed. The study indicates that the safety of the dam operation under the design flood level cannot meet the requirement of specification, and then the relevant landslide body must be reinforced.