近坝库岸滑坡涌浪对拱坝安全的影响研究

Influence of the surge caused by reservoir bank landslide on arch dam safety

为研究近坝库岸滑坡涌浪对拱坝的影响问题,对某水电站近坝库岸变形体开展整体和局部稳定性分析,偏保守地进行水库滑坡涌浪计算及其对大坝结构安全影响的敏感性分析。研究表明:(1)该变形体的产生与水库蓄水无关,且整体处于稳定状态;(2)在极端条件下,估算正常蓄水位和汛限水位时的滑坡涌浪到达坝前的高度分别为0.61 m和0.56 m;(3)在滑坡涌浪作用下,拱坝坝体应力分布规律正常,应力值在设计容许范围内。该研究为防范滑坡涌浪对拱坝造成不利影响提供了依据。

In order to study the influence of the surge caused by reservoir bank landslide on arch dams,overall and local stability analysis of the deformation body near a hydropower dam was carried out,calculation of the surge caused by reservoir landslide and sensitivity analysis of its impact on the safety of dam structure were conservatively accomplished.The results show that:(1)the generation of the deformation body which is in an overall stable position is not correlated with reservoir storage;(2)the heights of surges reaching the dam at normal water level and limit water level are 0.61 m and 0.56 m respectively under the extreme conditions;(3)and with the effect of the surge,the stress distribution on arch dam body is normal,meanwhile,the stress value is within the range of design allowable.This study provides the basis for preventing the arch dam from adverse effect of the landslide surge.