Scattering of seismic waves by three-dimensional large-scale hill topography simulated by a fast parallel IBEM  

作　　者：Liu Zhongxian Shang Ce Huang Lei Liang Jianwen Li Jie 

机构地区：[1]Tianjin Key Laboratory of civil structure protection and reinforcing,Tianjin Chengjian University,Tianjin 300384,China [2]PC Research and Development Centre,Tianjin Architecture Appraisal&Design Institute,Tianjin 300072,China [3]Department of Civil Engineering,Tianjin University,Tianjin 300072,China

出　　处：《Earthquake Engineering and Engineering Vibration》2020年第4期855-873,共19页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant No. 51678390;National Natural Science Foundation of China under Grant No. 51708391;the Major Science and Technology Projects in Tianjin under Grant No. 18ZXAQSF00110。

摘　　要：To solve seismic wave scattering by a large-scale three-dimensional(3-D) hill topography, a fast parallel indirect boundary element method(IBEM) is developed by proposing a new construction method for the wave field, modifying the generalized minimum residual(GMRES) algorithm and constructing an Open MP plus MPI parallel model. The validations of accuracy and efficiency show that this method can solve 3-D seismic response of a large-scale hill topography for broadband waves, and overcome the weakness of large storage and low efficiency of the traditional IBEM. Based on this new algorithm architecture, taking the broadband scattering of plane SV waves by a large-scale Gaussian-shaped hill of thousands-meters height as an example, the influence of several important parameters is investigated, including the incident frequency, the incident angle and the height-width and length-width ratio of the hill. The numerical results illustrate that the amplification effect on the ground motion by a near-hemispherical hill is more significant than the narrow hill. For low-frequency waves, the scattering effect of the higher hill is more pronounced, and there is only a single peak near the top of the hill. However, for high-frequency waves, rapid spatial variation of displacement amplitude appears on the hill surface.

关 键 词：scattering of seismic waves 3-D hill topography indirect boundary element method(IBEM) parallel calculation 

分 类 号：P631.4[天文地球—地质矿产勘探]