竖向断裂缝对场地地震动的影响分析  

Influence of vertical fault fissure on site ground motion

作　　者：贾相玉[1] 温瑞智[1] 周正华[1] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《自然灾害学报》2005年第5期166-169,共4页Journal of Natural Disasters

基　　金：地震科学联合基金资助项目(105023);国家自然科学基金资助项目(50178065)

摘　　要：断裂缝在工程场地十分常见,研究其对场地地震动的影响很有必要。基于应用局部人工边界条件模拟辐射阻尼影响的二维显式有限元方法,分别对垂直入射和斜入射地震波情形下具有不同深度的竖向断裂缝场地地震动进行了数值模拟,并与地表水平的均匀半空间场地地震动进行了对比,结果表明,断裂缝对其附近场地地震动的影响显著,但随着离开裂缝的距离变大,其影响迅速减小。The fault fissure is very common in the engineering site and it is necessary to understand the ground motion of the site with ground fissure.In this paper,2-D explicit finite-element method is combined with local artificial multi-transmitting formula to analyze the ground motion of site with vertical fault fissure.The input earthquake wave is vertical to the artificial boundary or to be oriented at some angle,then ground motion are calculated for different fissures depths.The results,which are compared with those for free-field without fissures show the fissure changes the ground motion and attenuates very quickly.

关 键 词：竖向断裂缝 有限元法 地震动 局部人工边界条件 

分 类 号：P315.915[天文地球—地震学]