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Title:: Analysis of the Ground Motions adjacent to Dip-slip Type Earthquake Surface Rupture zone

作者:: 张建毅¹; 薄景山¹; 2; 李平¹; 李孝波¹; (1.防灾科技学院地质工程学院,河北三河 065201; 2.中国地震局工程力学研究所,黑龙江哈尔滨 150080)

Author(s):: ZHANG Jianyi¹; BO Jingshan¹; 2; LI Ping¹; LI Xiaobo¹; (1.Department of Geological Engineering,Institute of Disaster Prevention,Sanhe 065201,Hebei,China)(2.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,Heilongjiang,China)

摘要:: 强震地表破裂对破裂带附近的建筑物造成巨大的破坏,如何在工程建设的场址选择中避开活断层是工程地质界和岩土工程抗震设计者关心的问题。利用汶川、玉树及数次强震断裂现场科考资料,基于破裂主要特征、模式、机理等构建了典型的倾滑型活动断层附近地质力学模型及工况,考虑贯通地表的基岩位错和强震动效应,结果表明:①在脉冲型地震动输入下,上盘均有明显的上盘效应,上盘效应外一定距离内有明显的“减震”作用; ②对于具有速度脉冲的波,在0.2 g、0.4 g地震动输入时,A_max在上盘20 m范围内显著增大,下盘10 m范围内增大; ③对于速度脉冲更明显的波,在0.2 g地震动输入时,A_max在上盘40 m范围内显著增大; 在0.4 g地震动输入时,A_max在上盘30 m范围内显著增大在下盘10～20 m范围内增大; ④应用地表地震动的参数合理分析确定了避让距离的数值,给出了一定解释。

Abstract:: Active faults surface ruptures often cause great damage to buildings near the ruptre zone.Therefore,how to avoid active faults in site selection of engineering construction is concerned by engineering geological and geotechnical engineering seismic designers.This article analyzes the Wenchuan,Yushu earthquakes and several seismic fracture site data burst characteristics,and the rich scientific model and mechanism model are constructed and the condition of active faults near the typical geological mechanics based on the consideration of the surface through Bedrock Dislocation and strong vibration effect.Some instructive conclusions are obtained:(1)Under the pulse type ground motion input,the upside has obvious effect on plate.At the same time,the plate outside a certain distance has obvious effect on the "shock" effect.(2)With velocity pulse wave,in the 0.2 g and 0.4 g ground motion input,A_max shall increase significantly within plate on 20 m,10 m footwall increased ranges.(3)More apparent velocity pulse wave,in the 0.2 g ground motion input,A_max increase significantly in plate 40 m range.At 0.4 g ground motion input,A_max only within the scope of the plate on the 30 m significantly increased,while the footwall within 10 m to 20 m.(4)Tto determine the fault setbacks of the reasonable numerical parameter analysis of the application of ground motion,this paper gives some explanation and verify its rationality.