Vol15 No.5: 1090-1100
【Title】Characteristics of thawed interlayer and its effect on embankment settlement along the Qinghai-Tibet Railway in permafrost regions
【Author】SUN Zhi-zhong1*; MA Wei1; ZHANG Shu-juan1; MU Yan-hu1; YUN Han-bo1,2; WANG Hong-lei1,3
【Addresses】1 State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2 Beiluhe Observation and Research Station on Frozen Soil Engineering and Environment in Qinghai-Tibet Plateau, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Golmud 816000, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China
【Corresponding author】SUN Zhi-zhong
【Citation】Sun ZZ, Ma W, Zhang SJ, et al. (2018) Characteristics of thawed interlayer and its effect on embankment settlement along the Qinghai-Tibet Railway. Journal of Mountain Science 15(5). https://doi.org/10.1007/s11629-017-4643-1
【Abstract】The formation of thawed interlayer beneath embankment can result in embankment settlement in permafrost regions. Based on the data on ground temperatures and deformations beneath the embankment, observed in-situ along the Qinghai-Tibet Railway in permafrost regions from 2006 to 2013, characteristics of the thawed interlayer beneath the embankment and its influence on the embankment settlement are studied. The results indicate that the thawed interlayer hardly forms beneath the natural field, and beneath the embankments from the Qinghai-Tibet Railway the thawed interlayer develops widely, and it can be refrozen totally in the regions with lower mean annual ground temperature, and developed further in the regions with higher mean annual ground temperature. The thawed interlayer is closely related to the embankment settlement. The ice content of permafrost underlying the thawed interlayer influences the settlement of embankment. The higher the ice content is, the larger the settlement is, and vice versa. The increase in thickness of thawed interlayer mainly results from the decline of artificial permafrost table in high-temperature permafrost regions.
【Keywords】In-situ monitoring; Qinghai-Tibet Railway; Embankment settlement; Thawed interlayer