On the Developmental Mechanism of Longitudinal and Deep Cracks on Road Slab in Seasonally Frozen Ground Region
It is reported that some large longitudinal cracks near the longitudinal axis of roads in seasonally frozen regions penetrate into the roadbed more then 1m deep. It is well-known that the kind of crack of road slab is caused by roadbed soil frost-heaving during the winter but not known how the longitudinal crack takes place and develops. Hence, based on the microcosmic mechanisms of soil freezing and heaving, the frost-heave force and its action between frozen soil and freezing fringe are expatiated. Being analyzed in two-dimension plane, the shape of freezing fringe in the roadbed is curved because of three surfaces, in open air, of trapezoidal roadbed. It is the curved freezing fringe in the roadbed that makes the direction of the frost-heave force, caused by the freezing water in-migrated and always normal to the freezing fringe, at one point on the freezing fringe different from that at other points. Conclusions were drawn that the road slab is not only bended but also tensioned by frost heave force, the direction and the magnitude of which are nearly symmetric about the longitudinal axis of road. Namely, mechanics models of road slab is a tension-bended member, while the frozen soil under the road slab is a compression-bending member before the road slab is completely broken and a bending member after that. The phenomenon that a large longitudinal crack near the longitudinal axis of road penetrates road slab into roadbed can be well explained in the light of mechanics of material. Mechanics model of the road slab will play a significant role in designing the road slab further to resist frost damage and in proposing the measures to prevent the road in seasonally frozen ground regions from frost damage in the future.
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Availability:
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Supplemental Notes:
- Copyright © 2011 ASCE
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Corporate Authors:
American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, VA United States 20191-4400 -
Authors:
- Song, Ling
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Conference:
- Third International Conference on Transportation Engineering (ICTE)
- Location: Chengdu , China
- Date: 2011-7-23 to 2011-7-25
- Publication Date: 2011
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 1543-1548
- Monograph Title: ICTE 2011
Subject/Index Terms
- TRT Terms: Frigid regions; Frozen soils; Pavement cracking; Slabs; Subgrade (Pavements)
- Subject Areas: Geotechnology; Highways; Pavements; I26: Water Run-off - Freeze-thaw; I42: Soil Mechanics;
Filing Info
- Accession Number: 01447254
- Record Type: Publication
- ISBN: 9780784411841
- Files: TRIS, ASCE
- Created Date: Sep 26 2012 8:59AM