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Numerical Simulation for Stability of Subgrade on Seasonal Frozen Area

Author: KongLingQi
Tutor: YuanWenZhong
School: Southwest Jiaotong University
Course: Geotechnical Engineering
Keywords: Seasonally frozen Roadbed Frothing Numerical Analysis Isolation layer Frost heave Thaw settlement
CLC: U416.1
Type: Master's thesis
Year: 2007
Downloads: 499
Quote: 1
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Abstract


State Highway 213 Langmusi to Chuanzhusi highway reconstruction project by China's largest high altitude wetlands - Ruoergai wetlands. Plateau seasonal permafrost roadbed often frost heave , thaw brings a great deal of inconvenience to the traffic . Collate existing research on the basis of focusing on the seasonal frozen soil roadbed stability studies, reference for the future Northwest Sichuan seasonal road design . Due to the special geographical and climate conditions , the plateau seasonal frozen soil areas the roadbed tympanites disease compared with the Mainland is more serious and complex , these external performance roadbed differential settlement and reduce the physical and mechanical properties of subgrade and pavement materials in freeze-thaw conditions . In this paper, the ABAQUS finite element numerical simulation software Frothing disease occurs subgrade deformation and stress , financial the Shen conditions under subgrade and pavement structure through the analysis of permafrost roadbed deformation characteristics Frothing disease is the result of the combined effects of a series of influential factors . Subgrade and pavement disease characteristics , disease control countermeasures . Of moisture migration from the point of view of the embankment seepage simulation . The roadbed has a sufficient strength , the overall stability and water stability , should meet the critical minimum of embankment height requirements and to meet the requirements of the subgrade dry and wet type so that the roadbed in a dry or in a wet state . In seasonal frozen area environment , the roadbed height increased by capillary water height, the groundwater position jointly decided . Recommended 1.5m fill high embankment from the protection of the environment and economic and social benefits into account , and if necessary, take the roadbed in the lower part of the laying of permeable isolation layer . Papers on the basis of previous research that , according to the Northwest of the climate and of soil conditions for the setting position of the region's the seasonally frozen subgrade isolation layer . The stress deformation results by different isolation layers corresponding to the position of roadbed in the most unfavorable season the roadbed overall stress deformation and isolation layer , highway design in the Northwest of the isolation layer is set away from the embankment below the top surface of the 1.0 m about location , both to meet the requirements of the isolation layer and subgrade overall force , but also to ensure a watertight guarantee roadbed upper drying .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade
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