【摘要】 采用二维等效线性有限元程序对典型山谷型填埋场进行非线性动力分析。综合考虑了地基刚度、动荷周期、幅值及填埋体的刚度对填埋场顶部加速度响应特性的影响,从地基基本周期Ts、地震卓越周期Tp和填埋场的基本周期TL三者相互关系的角度得出了填埋场地震响应的普适性规律:各种影响因素都是通过改变这三个周期的相对大小关系来改变填埋场的响应情况。当Ts=Tp=TL时,填埋场顶部的响应达到最大;如果Tp=TL或者Tp=Ts,则填埋场的动力响应值中等;三个周期相差甚远时,填埋场的响应值最小。通常情况下TL较大,Tp较小,对于压得很密实或者填埋时间长久的填埋场,剪切波速增加使TL减小;地震幅值的增加,由于材料的非线性使得Ts和Tp增加,从而容易使周期接近,而激发较大响应。该结果对填埋场抗震设计有指导意义。更多还原

【Abstract】 2-D finite element equivalent linear numerical simulations were performed to analyzed nonlinear dynamic behaviors of a typical valley-type landfill.Some factors,such as foundation stiffness,dynamic load period and amplitude,and rigidity of MSW landfills were considered to investigate the acceleration response characteristics at the top of the landfill.With the relationship among fundamental periods of site and landfill(Ts and TL) and dominant period of earthquake(Tp),the universal laws of acceleration response characteristics of landfills were obtained.It was shown that different factors influencing a landfill seismic responses can be interpreted as their varying the relative values of the above three periods;when Ts=Tp=TL,the response value reaches the maximum;if Tp=TL orTp=Ts,the response value stays a middle level;when the three periods have a large difference,the response value is the minimum.In normal cases,TL is bigger,Tp is smaller;when MSW is dense or landfilling time is longer,increase in shear wave velocity lead to TL smaller;increase in seismic amplitude raises Ts and Tp due to material nonlinearity,the three periods are easy to be close to each other and the seismic response value becomes bigger.The results were helpful for aseismic design of municipal solid waste landfills.更多还原