地震体波斜入射下的断层台阶地震反应分析
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摘要
应用显式有限元法对倾斜断层台阶在地震体波斜入射下的地震反应进行了数值模拟。模拟结果表明,P波入射时的竖向运动分量和SV波入射时的水平向运动分量在台阶上角点处存在极大值、在台阶下角点处存在极小值,同时在上下台面还出现由角点激发、向台阶外传播的转换体波与面波。这一结果说明,在断层台阶场地建设重大工程时应离开上角点一定距离,并考虑上下水平表面地面运动的差异性。
The explicit finite element is used to simulate the seismic response of an inclined fault step subjected to obliquely incident P and SV waves. The numerical result shows that the amplitudes of vertical component when incident wave is P wave and the horizontal component when incident wave is SV wave are maximal at top corner and minimal at bottom corner, and the converted body waves and surface waves occur on the upper and lower horizontal surface, which propagating away from the fault step. This result shows that the important projects should keep away from the top corner of a fault step, and the difference of ground motion between the upper and lower horizontal surfaces should be considered in the design of the important projects crossing the fault step.
The explicit finite element is used to simulate the seismic response of an inclined fault step subjected to obliquely incident P and SV waves. The numerical result shows that the amplitudes of vertical component when incident wave is P wave and the horizontal component when incident wave is SV wave are maximal at top corner and minimal at bottom corner, and the converted body waves and surface waves occur on the upper and lower horizontal surface, which propagating away from the fault step. This result shows that the important projects should keep away from the top corner of a fault step, and the difference of ground motion between the upper and lower horizontal surfaces should be considered in the design of the important projects crossing the fault step.
引文
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[2]石玉成,陈丙午.非发震断层的地震效应问题[J].西北地震学报,1994,16(1):12-20.
[3]李山有,马强,武东坡,等.断层场地地震反应特征研究[J].地震工程与工程振动,2003,23(5):32-37.
[4]李山有.断层对地震动影响及强震动观测应用研究[R].哈尔滨工业大学博士后研究工作报告,2003.
[5]曹炳政,罗奇峰.浅层断层对场地地震动影响的有限元分析[J].地震学报,2003,25(1):96-101.
[6]JINXing,LIAOZhen peng.StatisticalresearchonS waveincident angle[J].EarthquakeResearchinChina,1994,8(1):121-131.
[7]SigakiTakahiro.Estimationofearthquakemotionincidentangleat rocksite[A].Proceedingsof12thWorldConferenceEarthquake Engineering[C].UpperHutt,NewZealand,2000,956.
[8]廖振鹏.工程波动理论导引(第2版)[M].北京:科学出版社,2002.
[9]李山有,王学良,周正华.地震波斜入射情形下水平成层半空间自由场的时域计算[J].吉林大学学报(地球科学版),2003,33(3):372-376.
[10]李山有,廖振鹏.地震体波斜入射情形下台阶地形引起的波型转换[J].地震工程与工程振动,2002,22(4):9-15.
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