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Title:: Time-domain Analysis Method of Seismic Response of Soil Layer Site Considering the Pore-water Pressure Change of Sandy Soil

Author(s):: MA Rui; LI Xiaojun; RONG Mianshui; DONG Qing; (Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

Keywords:: Ground motion; sandy soil site; pore-water pressure; time-domain analysis methods

摘要:: 基于动态骨架曲线土体动力本构模型,应用适用于非规则荷载作用下的砂土孔压增长公式,推导出一个适用于砂土场地的动力应力-应变关系式,并提出了一种考虑砂土孔压影响的场地土层地震反应时域分析方法。基于Matlab平台编写了场地土层地震反应计算程序。利用美国加纳山谷岩土台阵的观测数据,对所提出的地震反应时域分析方法进行验证。结果表明:该方法可以较好地模拟含饱和砂土的场地地震反应分析中孔压变化对场地地震动的影响,并得到了与实际观测记录拟合较为良好的孔压曲线,证明了方法的实用性及计算结果的合理性。

Abstract:: When analyzing the seismic response of sandy soil sites,how to reasonably consider the influence of pore pressure on site response is a major concern.In this paper,based on the soil dynamic constitutive model with dynamic skeleton curve,a dynamic stress-strain relationship is derived for sandy soil sites by introducing the pore pressure growth equation applicable to irregular loading,and a time-domain analysis method is established for the seismic response of the soil layer site considering the influence of the pore-water pressure of sandy soil.A computer program Sand Pore Pressure One-dimensional Time Domain(SPODTD)was developed based on the Matlab platform to calculate the seismic response of the soil layer site.The proposed method was validated using the observation data from the Garner Valley Downhole Array(GVDA)in the United States.The results show that the method can better simulate the influence of pore-water pressure change on ground motion for the seismic response analysis of the site with saturation sandy soil,and can obtain pore-water pressure change curves that fit well with the actual observation records,which demonstrates the practicality of the method and the reasonableness of the calculation results.