不同方向地震激励对水工隧洞位移的影响

目前在研究水工隧洞地震响应时只考虑了单向地震激励,忽略了双向地震激励,故不能合理地分析不同方向地震激励对水工隧洞位移的影响。因此,选取合理的材料参数和模型边界条件,应用ANSYS建立了某水工隧洞的三维有限元模型,对单向地震激励和双向地震激励下的水工隧洞进行了位移分析。结果表明,不同方向的地震激励对水工隧洞的水平位移和竖直位移影响不同,水平位移主要受x方向地震激励影响,竖直位移主要受y方向地震激励影响,并根据单向地震激励和双向地震激励存在的相关性,建立了位移数学关系模型。

Analysis of Influence of Different Direction of Earthquake Excitation on Displacement of Hydraulic Tunnel

At present, most scholars have only considered unidirectional earthquake excitation in hydraulic tunnel, but have neglected bidirectional earthquake excitation. So, the effect of earthquake excitation from different directions on the hydraulic tunnel displacement can not be analyzed reasonably. Therefore, in this paper, reasonable material parameters and model boundary condition have selected, and ANSYS has been applied to establish the three-dimensional finite element model of a certain practical engineering. And then displacement analysis has been made for the hydraulic tunnel under the conditions of unidirectional and bidirectional earthquake excitations. It turns out that the impact of earthquake excitation from different directions on the horizontal displacement and vertical displacement is different. Horizontal displacement is mainly affected by the earthquake excitation in x direction, while vertical displacement is mainly affected by the earthquake excitation in y direction. Mathematical model of displacement relationship have been built according to the correlation between unidirectional earthquake excitation and bidirectional earthquake excitation.