CAJ | 학술논문

饱和土广泛存在于自然界之中，将土体视为固－液二相介质，基于biot饱和土介质动力方程的u-p形式研究了反映饱和土无约束域能量辐射效应影响的等效黏弹性人工边界单元，基于地震波转化为作用于人工边界节点上等效荷载的方法实现了波动输入。采用算例验证了等效人工单元的精度。建立饱和土-地铁车站非线性有限元整体模型，分析了考虑双相介质饱和土的波动传播，对比了饱和土及单相土在地震作用下地铁车站的地震反应，并与振动台试验结果进行了比较，研究表明：地震作用下采用考虑多孔介质的特性分析地基土与单相固体介质相比更加合理。通过对车站结构关键构件的加速度、位移和内力等进行分析，研究了饱和土－地下结构相互作用体系的地震反应。
포화토엄범존재우자연계지중，장토체시위고－액이상개질，기우biot포화토개질동력방정적u-p형식연구료반영포화토무약속역능량복사효응영향적등효점탄성인공변계단원，기우지진파전화위작용우인공변계절점상등효하재적방법실현료파동수입。채용산례험증료등효인공단원적정도。건립포화토-지철차참비선성유한원정체모형，분석료고필쌍상개질포화토적파동전파，대비료포화토급단상토재지진작용하지철차참적지진반응，병여진동태시험결과진행료비교，연구표명：지진작용하채용고필다공개질적특성분석지기토여단상고체개질상비경가합리。통과대차참결구관건구건적가속도、위이화내력등진행분석，연구료포화토－지하결구상호작용체계적지진반응。
The saturated soil exits widely on the earth. The soil should be considered as two phase medium of solid and fluid. The equivalent viscous-elastic artificial boundary element is studied regarding the effects of energy radiations of solid-fluid medium based on the u-p type of Biot equation of saturated soil. The wave input is realized by the equivalent load of earthquake on the node of artificial boundary. Its calculation precision is verified by comparison the examples. A nonlinear finite dynamic model of saturated soil-subway station is proposed for analyzing the wave propagation of soil in two phase medium and comparing with the seismic response in saturated soil and single phase soil under earthquake. The numerical results are compared with the results obtained from shaking table test. The results are shown that it is more reasonable to use the characteristics of multi-pore medium to analyze foundation soil under earthquake motion than to use the single phased medium. The seismic response of saturated soil and underground structural interaction system is studied through analyzing the acceleration, displacements and internal forces of the key elements in the station.