【摘要】 在青藏高原的寒季和暖季条件下,对青藏铁路北麓河段的块石路基和素土路基进行了强震动测试,运用二维等价线性时程响应动分析法对2种典型结构路基进行了动力响应的数值计算.结果表明,从路肩到坡脚的机车荷载传递具有明显的衰减效应,并且暖季衰减大于寒季.在路基中心的原地表处,块石路基的振动衰减效应大于素土路基.更多还原

【Abstract】 Different kinds of embankments are employed at permafrost regions along the Qinghai-Tibet Railroad.In order to obtain their dynamic response characteristics of typical structure embankments under the effect of train vibration loading at permafrost regions,strong motion observation tests were carried out,at warm and cold seasons of the Qinghai-Tibet plateau,at crushed rock embankment and plain fill embankment at the Beilu River segment.Based on these tests in situ,the dynamic finite element analysis method of two dimensions linearly equivalent was applied for dynamic response numerical calculation on these two embankments.The results show that there is an obvious damping effect during the transfer process from road shoulder to slope toe,the value of vibration attenuation in warm season is greater than that in cold season.And the vibration attenuation in crushed rock embankment is greater than that in plain fill embankment at center roadbed where natural ground locates.更多还原