青藏公路高路基病害的形成及其机理  

Formation and mechanism of high subgrade diseases of Qinghai-Tibet highway

作　　者：陈建兵[1,2] 汪双杰[2] 章金钊[1,2] 马巍[1] 

机构地区：[1]中国科学院冻土工程国家重点实验室,甘肃兰州730000 [2]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《长安大学学报（自然科学版）》2008年第6期30-35,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200231800004)

摘　　要：为研究以纵向裂缝为主的青藏公路高路基病害的形成及其机理,在大量实地调查研究的基础上,分析了高路基病害形成的原因,分析认为高路基病害不仅与融化盘有关,还与融化夹层、冻结核和冻土环境等相关。研究结果表明:高路基病害与路基高度及坡向直接相关;路基高度大于2.5m的路基内高路基病害占总量的75.7%,且阳坡侧病害占总量的66.5%;当路基高度小于临界高度时,融化盘及其偏移是形成路基病害的主要原因;反之,在高温冻土区,融化夹层则是主要因素,而在低温冻土区,冻结核形成的"凸"滑动面与阳坡侧坡脚下融化盘的联合作用引发了一系列高路基病害;施工质量与冻土环境的破坏等构成了影响高路基病害的人为因素;高路基病害的治理应因地制宜,结合病害的形成特点采取不同的治理方案。In order to study the formation mechanism of longitudinal cracks in high subgrade, on the basis of a great deal of field investigations along Qinghai-Tibet highway, the causes of producing diseases in high subgrade are analyzed, it is pointed out that the high subgrade diseases are not only correlated with the thaw bulb, but also with thaw layer, frozen bulge and permafrost environment. Researches indicate that： the high-subgrade diseases have the direct relationship with height and trend of subgrade, this type of diseases in the roadbed which is higher than 2.5 m are 75.7% of the total numbers, and the diseases which happen in sunny side are 66.5 %, When height of roadbed is less than critical height, the thaw bulb and its excursion are the main causes of the diseases; when the height of roadbed is more than critical height, in high-temperature permafrost regions, thaw interlining is the main cause, while in low-temperature permafrost regions, gibbose freezing front formed by freezing core and the thaw bulb under the foot of sunny slope are combined to cause a series of high-subgrade diseases; the construction quality and the destruction of permafrost environment are the main artificial factors to cause high-subgrade diseases; the high-subgrade diseases should be treated according to the local condition, and different treatment plans should be taken according to the features of diseases. 1 tab, 6 figs, 8 refs.

关 键 词：道路工程 青藏公路 高路基病害 形成机理 

分 类 号：U416.168[交通运输工程—道路与铁道工程]