摘要
通过1∶2000活动断裂勘测与地质灾害调查,在青藏铁路沿线鉴别出24条不同规模、不同宽度的构造裂缝带。青藏铁路沿线构造裂缝主要沿活动断层分布,呈线性排列,产状稳定,延伸较长,成群产出,与现今构造变形、断层运动及断层破碎带不均匀冻胀存在成因联系,常形成密集的构造裂缝带。构造裂缝带宽20～2400m。构造裂缝对青藏铁路、青藏公路及沿线工程安全具有不良影响,能够产生显著的灾害效应,如切割错断路基,产生路面塌陷,诱发不均匀冻胀变形,影响工程质量和行车速度,对车站、房屋、管道也将产生不同程度的破坏作用。
Through 1∶2000 geological survey, 24 tectonic fracture zones across the GolmudLhasa railway are identified in North Tibetan Plateau. Most of the tectonic fractures occur within active faults and distribute parallel with stable orientation and large extensions. And they often form fracture zones of 20～2400m widths. The tectonic fractures are caused by present crust deformation, fault motion and heterogeneous freezing. The tectonic fractures cut roadbed, cause roadsurface collapse, and induce heterogeneous freezing deformation, giving negative effects to construction quality and hazard effects to traffic transportation. They can also destruct buildings, pipelines and railway stations.
出处
《水文地质工程地质》
CAS
CSCD
2003年第6期15-20,48,共7页
Hydrogeology & Engineering Geology
基金
国土资源大调查项目勘测研究成果(1212010340302)
关键词
青藏铁路
构造裂缝
工程危害
地质特征
tectonic fracture
active fault
geological hazard
railway across the Tibetan Plateau
