摘要
冻土边坡研究最早从自然斜坡开始,主要研究热融滑塌、融冻泥流的变形特点、失稳机理、稳定性评价方法和工程处理措施。研究发现:厚层地下冰的热稳定性是决定斜坡稳定与否的关键因素,与一般地区边坡稳定性不同。在冻土边坡方面,主要着重于厚层地下冰地段路堑边坡防护与支挡、沼泽化斜坡路基与陡坡地段冻土路堤稳定性研究。在冻土支挡建筑物方面,主要研究挡土墙与锚定板的设计计算方法,认为冻土支挡设计应考虑水平冻胀力,冻土挡墙的合理形式是柔性结构挡土墙,而锚定板设计需要考虑冻土的流变特性。从2007年8月青藏铁路冻土路基病害调查来看,路堑边坡和陡坡路堤是冻土路基病害高发地段,是影响青藏铁路安全运营的主要威胁。
Permafrost slope research has begun from natural slopes mainly in respect of the deformation characteristics,instability mechanism,stability evaluating method and engineering measures on thaw-slumping and gelifuction.It has been discovered that thermal stability of thick ground ice is the key factor of natural slope stability and slope stability in permafrost regions is different from that in ordinary regions.Emphasis is laid on protection and retaining on cutting in thick ground ice sections and on stability of swamping slope embankments and permafrost embankments in heavy grade sections in research of permafrost slopes.Designing and computing methods for retaining walls and anchor slAbs are stressed in the field of permafrost retaining engineering.Horizontal frost-heave forces need to be considered in design,the reasonable structure of permafrost retaining walls is the flexible structure;anchor slab design needs to take into account the rheological characteristics of permafrost.Investigation into permafrost subgrade diseases of the Qinghai-Tibet Railway carried out in August of 2007 shows that cutting slopes and escarpment embankments lie in sections of high probability of permafrost subgrade diseases and they are the main threat to the safe operation of the Qinghai-Tibet Railway.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2010年第4期102-107,共6页
Journal of the China Railway Society
基金
国家科技支撑计划(2006BAC07B02)
关键词
青藏铁路
多年冻土
边坡
路基
稳定性
the Qinghai-Tibet Railway
permafrost
slope
subgrade
stability
