A novel method for estimating settlement of embankments in cold regions
A novel method for estimating settlement of embankments in cold regions
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DOI：
10.1016/j.coldregions.2012.12.009
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发表时间：
2013-04
影响因子：
4.1
通讯作者：
Songhe Wang;Ji-lin Qi;Fan Yu;Xiaoliang Yao
中科院分区：
文献类型：
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作者：
Songhe Wang;Ji-lin Qi;Fan Yu;Xiaoliang Yao
寒区路基沉降主要是由多年冻土的融沉和温冻层的蠕变共同作用引起的。为了估算路基沉降，提出了一种新的方法。首先，分析了上述沉降源的理论模型。采用改进的三维融固结理论研究冻土的融固结问题，提出了基于Drucker-Prager屈服准则的冻土蠕变模型。其次，在FLAC 3D中用FISH语言编制了程序，对季节性冻融作用下相应区域的融冻固结和徐变进行了活载计算。最后，以青藏公路沿着典型路段为研究对象。结果表明，模拟沉降与现场监测结果吻合较好。
Settlement of embankments in cold regions mainly results from thaw consolidation of permafrost and creep of warm frozen layer. To estimate the settlement of embankments, a novel method was proposed in this paper. Firstly, the theoretical models for the aforementioned sources of settlement were analyzed. An improved 3D thaw consolidation theory was used for the thaw consolidation of permafrost while a creep model was proposed to describe the creep of frozen soils with a Drucker–Prager yield criterion. Secondly, the program code was compiled in the FISH language in FLAC 3D for the live calculation of thaw consolidation and creep in corresponding domains which change under seasonal freeze–thaw. Finally, a typical section along the Qinghai–Tibetan highway was taken as the study object. Results show that the simulated settlement agrees well with the monitored data in situ.