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The Influence of Local Inclusions in Layered Half-space on the Earthquake Ground Motions

Author: ZuoRan
Tutor: LiangJianWen
School: Tianjin University
Course: Disasters Prevention Engineering
Keywords: Jams Indirect boundary element method Scattering Seismic response Layered half space Fourier transform
CLC: TU311.2
Type: Master's thesis
Year: 2009
Downloads: 9
Quote: 0
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Abstract


Underground jammed area is one of the typical local site to study the ground motion has important engineering and theoretical value . In this paper, an indirect boundary element method to study the layered half-space jammed area nearly venue vibration . By numerical calculation , gives some useful conclusions plug regional engineering structures for earthquake resistance of reference for available folders . First round jammed in the half-space of SH wave scattering problem solving frequency , discussed in depth jammed area , the incident wave frequency and angle parameters on ground motion , and gives the different parameters jam near the surface displacement response spectrum . Thus , for example, first round jammed in a single soil were calculated in the frequency , and then combined with the fast Fourier transform technique for solving the when get jammed nearby area earthquake history response . Detailed parameters , discussed the incident angle , folders the plug material properties as well as soil stiffness characteristics of earthquake response spectrum . The study showed that : folder Cypriot area of seismic waves significant scattering effects , especially soft folder Cypriot area of seismic wave performance a significant role in filtering , so that the displacement of the surface observation point response spectrum curve oscillation severe displacement response to the frequency of the incident wave is very sensitive ; contrast, rigid jam , surface displacement amplitude amplification effect is not very significant . The case of layered space jam near to vibration response characteristics by soil characteristics and clip the combined effects of the Cypriot area characteristics . Seismic waves in the round jammed area , the bedrock greater stiffness the surface amplification effect of the stronger ; the smaller jam stiffness , the surface amplification effect of the stronger ; smaller the depth of the jammed area , the surface amplification effect of the stronger . Overall, the seismic waves , each case folder acceleration time history of the the plug near surface seismic waves has increased , especially jammed corresponding to the region just above the jammed area of near-Earth space shock was evident amplification.

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