【摘要】 不同地震荷载对黄土震陷有着重要的影响。本文利用可对试样施加任意波轴向荷载的动三轴试验系统,对原状黄土在不同地震荷载作用下的震陷进行了对比试验研究,分析了不同地震荷载对黄土震陷特性的影响。试验研究表明,随机地震荷载与等幅正弦荷载作用下黄土的残余变形随动应力的增大而增大,但增长趋势不同,不同地震荷载作用下黄土的震陷特性有明显的变化;不同地震荷载对黄土震陷临界动应力的影响不同,随机地震荷载作用下黄土的震陷临界动应力都比等幅正弦荷载作用下的大;不同卓越周期、峰值和持时的随机地震荷载对黄土的震陷临界动应力的影响也不相同;黄土的震陷与随机地震荷载的卓越周期、峰值和持续时间有关,其中随机地震荷载的卓越周期对黄土震陷的影响较明显。更多还原

【Abstract】 Different seismic loads have important effect on loess subsidence.By means of the triaxial testing equipment,which is used to load random waves on specimen axially,undisturbed loess subsidence is comparatively studied under different seismic loads,and the effect of different seismic load on characters of loess subsidence is analyzed.The test indicates that the rasidual deformation of loess increases with the increase of dynamic stress under random seismic load or sine wave load,but the increase tendencies of them are different,which show that the characters of loess subsidence vary obviously under different seismic loads,and the effect of different seismic loads on the critical dynamic stress of loess subsidence is different,that is the critical dynamic stress is larger under the random seismic load than under sine wave load,and the effect of the random seismic load with different predominant periods,peaks and durations is also different,that is,the loess subsidence has relation with the predominant period,peak and duration of the random seismic load,and the effect of the predominant period is quite obvious.更多还原