地震波斜入射时不同水深超高水头船闸地震反应分析

Analysis of the seismic response of ultra-high head lock at different water depths under oblique incidence of seismic waves

基于黏弹性边界的地震动斜入射方法模拟平面SV波和P波不同角度入射情况,采用声固耦合法模拟闸室内动水压力,研究超高水头船闸闸室在不同水深下闸顶位移、加速度和塑性损伤等地震反应。研究表明:地震波斜入射时,超高水头船闸的地震反应随水深变化的规律较垂直入射时明显不同,地震反应的程度一般较垂直入射时更大;相同水深条件下,闸顶水平相对位移峰值、水平加速度峰值多数情况下随入射角增大而增大。超高水头船闸闸室结构地震反应结果受水深变幅影响显著。一般闸墙相对高度为0.2附近的区域更易出现严重受拉损伤,相对水深为0.97时,闸墙临水侧达到严重破坏程度的受拉损伤范围最大。对综合考虑斜入射地震波和闸室内不同水深共同作用有一定的影响。

The ground vibration input method based on viscous-spring boundary simulates the incidence of plane SV and P waves at different angles,and the acoustic structure coupling method is used to simulate the dynamic water pressure inside the lock chamber to study the seismic response of the lock roof displacement,acceleration and plastic damage in the ultra-high head lock chamber at different water depths.The study shows that when the seismic waves are obliquely incident,the seismic response of the ultra-high head locks varies significantly with the water depth compared to the vertical incidence,and the general degree of seismic response is greater than that of the vertical incidence.Under the same water depth conditions,the peak horizontal relative displacement and peak horizontal acceleration of the top of locks increases with the increases of the incidence angle in most cases.The seismic response of the lock chamber structure of the ultra-high head lock is significantly affected by the variation of the water depth.The area near the general gate wall with relative height of 0.2 is more likely to have serious damage,and when the relative water depth is 0.97,the tensile damage range on the waterfront side of the gate wall reaching serious damage is the largest.It is suggested that the combined effect of oblique incident seismic waves and different water depths within the gate should be considered.