青藏铁路多年冻土区典型结构路基振动响应特性  

Characteristics of Vibration Response of Typical Structure Embankments at Permafrost Regions Along the Qinghai-Tibet Railroad

作　　者：吴志坚[1,2] 陈拓[1] 马巍[3] 王兰民[1,2] 

机构地区：[1]中国地震局兰州地震研究所黄土地震工程开放实验室,兰州730000 [2]中国地震局地震预测研究所兰州创新基地,兰州730000 [3]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000

出　　处：《上海交通大学学报》2011年第5期716-721,727,共7页Journal of Shanghai Jiaotong University

基　　金：中国地震局地震预测研究所基本科研业务费资助项目(2010A76);国家自然科学基金项目(40902094);中国科学院西部行动计划(2期)项目(KZCX2-XB2-10);中国科学院冻土工程国家重点实验室开放基金项目(SKLFSE200801)

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.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.

关 键 词：青藏铁路 块石路基 振动传递 动力响应 

分 类 号：TU445[建筑科学—岩土工程]