|Table of Contents|

Evolution laws and failure characteristics of subgrade deformation inalpine permafrost region(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2016年04期
Page:
78-87
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Evolution laws and failure characteristics of subgrade deformation inalpine permafrost region
Author(s):
LI Jin-ping;  ZHANG Juan;  CHEN Jian-bing;  ZHU Dong-peng;  YUAN Kun
State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi’an 710075, Shaanxi, China
Keywords:
subgrade engineering;  alpine permafrost region;  subgrade deformation;  evolution law;  uneven settlement
PACS:
U416.168
DOI:
-
Abstract:
In order to further study the evolution process of subgrade deformation failure in permafrost region, the subgrades at section of K6+200 in the high-temperature and ice-rich permafrost region and at section of K8+200 in the low-temperature and ice-rich permafrost region along Mobei Highway were choose as research objects, the temperature and deformation sensors were installed at different positions and different depths of subgrades, and the evolution processes and characteristics of measured temperatures and deformations under different conditions in high-latitude and alpine permafrost region were analyzed. Analysis result shows that in high-temperature and ice-rich permafrost region, an obvious offset of thaw bulb under subgrade is formed after 2 years service period. Transverse uneven deformation feature of newly-built wide subgrade is observed obviously, there are two thaw bulbs under subgrade, one obviously offsets to the slope toe of subgrade. The permafrost tables at left slope toe and the center of road obviously decrease by 3-4 m, and the settlement of the original natural surface under subgrade is 4-9 cm after 2 years service period. The permafrost table at shoulder remains stable. In low-temperature and ice-rich permafrost region, under ensuring a certain height of subgrade, besides the deformation(post-construction settlement)of subgrade soil in early service time, the subgrade deformation caused by permafrost melt is very small, therefore the subgrade stability in low-temperature permafrost region is relatively superior. So, the conclusion further illustrates the causes of serious deformations of subgrade and pavement in high-temperature permafrost region, and offers the reference for the design and disease control of pavement damage resistance in high-latitude and alpine permafrost region. The result further illustrates the failure characteristics and reasons of uneven deformation, such as settlements, longitudinal crack and so on. It is concluded that under ensuring a certain height of subgrade, the subgrade has relatively better stability in low-temperature permafrost region than in high-temperature permafrost region, and this result has great significance for subgrade design and disease control in high-latitude and alpine permafrost region. 1 tab, 14 figs, 21 refs.

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Last Update: 2016-08-30