2017, Volume 19, Issue 6
Strategic Study of CAE >> 2017, Volume 19, Issue 6 doi: 10.15302/J-SSCAE-2017.06.020
Distresses and Countermeasures of Highway Subgrade in Plateau Permafrost Regions
State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi'an 710075, China
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Abstract
This study collects the maintenance history, reconstruction material, and disease data of the Qinghai–Tibet Highway (QTH) over the past 60 years. The QTH is then divided into a stable region, a basically stable region, an unstable region, and a highly unstable region according to the road disease rate. Subsequently, 134 km typical disease sections are selected, and the relations between the road diseases and the mean annual ground temperature (MAGT), permafrost degradation rate, and ice content are studied based on the survey data. The average road service life is also determined. Newly developed diseases and their temporal effect are analyzed using the treatment measure. Furthermore, new stabilizing technologies adaptive to large-scale permafrost subgrade (e.g., distributed ventilation subgrade, unidirectional heat conduction board subgrade, and integrated pavement-subgrade heat drainage structure) are introduced. The results show that the MAGT, degradation rate of permafrost tables, and ice content are negatively related to the road service life. In all kinds of treatment measures, thermosyphon, crushed-rock, insulation board, and ventilation duct plus flag and block stone have a higher effective rate in heat prevention compared to other measures.
Keywords
permafrost ; temporal effect ; subgrade distress ; field investigation ; large-scale subgrade ; stabilizing technology
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