盆地特征参数对海底盆地地震响应的影响  

Impact of Basin Characteristic Parameters on Seismic Response of Subsea Basin

作　　者：吕宇坤 LV Yukun(College of Mechanics and Materials,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学力学与材料学院,江苏南京211100

出　　处：《粉煤灰综合利用》2023年第2期29-38,共10页Fly Ash Comprehensive Utilization

摘　　要：为研究海底盆地地震响应规律,本文运用谱元法理论针对二维含水梯形盆地地震动分析模型,研究了在内源地震作用下,盆地特征参数对海底盆地地震响应的影响,分析了盆地加速度峰值分布规律、加速度峰值放大系数和频谱特征与盆地倾角和盆地深度的关系,研究发现:当考虑流固耦合时,谱元法网格尺寸为四分之一波长时即可取得较高精度。盆地倾角以及深度对加速度峰值与放大系数的大小和分布规律具有显著影响。盆地倾角以及深度对加速度时程的影响主要体现在盆地中。盆地倾角对加速度谱的影响主要体现在盆地边缘部位,而盆地深度则相反。In order to study the seismic response law of the submarine basin,the influence of basin characteristic parameters on the seismic response of the submarine basin under the action of endogenous earthquakes is studied by applying the spectral element method theory to the seismic analysis model of 2D water-bearing trapezoidal basin.The relationship between the peak acceleration distribution law,peak acceleration amplification coefficient and spectrum characteristics of the basin and the inclination and depth of the basin is analyzed.It is found that when considering the fluid-solid coupling,higher accuracy can be achieved when the grid size of the spectral element method is quarter wavelength.Basin dip and depth have significant effects on the magnitude and distribution of peak acceleration and amplification coefficient.The influence of basin dip and depth on acceleration time history is mainly reflected in the basin.The influence of basin dip on acceleration spectra is mainly reflected at the edge of the basin,while the depth of the basin is adverse.

关 键 词：盆地 谱元法 地震动 

分 类 号：TU435[建筑科学—岩土工程]