中文摘要：

通过对黄土场地爆破的波动响应频谱及其微观结构形态的分析,首次提出了黄土的微结构颗粒动力理论。根据颗粒理论建立了动应力–应变–时间的阻尼式,后引入波动方程最终得到黄土震动响应的波动时程算式。结合场地爆破数字资料记录,代入土力学参数进行计算验证,计算所得的加速度响应波形频谱与爆破记录测得的波形及频率均较为吻合。另外,在研究不同成因深度土层微结构颗粒的非线性频谱特点后,发现不同成因土层的微结构产生的响应频率是有差别的,并且与颗粒传导有关：松散的微结构高频成分多,力链传递＂远＂;胶结较紧密的土层高频成分少,力链传递＂近＂。研究结果为黄土场地地震响应的理论分析提供了新的方法。

英文摘要：

Based on analysis of response spectrum characteristics and microstructure of loess at blasting loess site,the micro-particle-dynamical theory is proposed firstly.According to the particle theory,the dynamic stress-strain-time damping equation is established,then,fluctuation time-history formula of loess seismic response is obtained through applying wave equation.Binding digital data record at the blast site,mechanical parameters of loess are introduced into the fluctuation formula,and the simulation wave curves are acquired.It shows that the waveform and frequency of the calculated acceleration response spectrum and the blasting waveform recording are relatively consistent.Moreover,studied on the characteristics of non-linear spectrum of different loess particles,different causes of formation microstructure of loess has difference response frequency,and correlated to its particle conduction.The loess of loose microstructure particles has more high-frequency components and ＂longer＂ power-chain transmission.However,the loess with dense microstructure particles has less high-frequency components and ＂shorter＂power-chain transmission.It provides a new way for theoretical analysis of earthquakes response at loess site.