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Measurement of Frost Heave Forces on H-piles and Pipe Piles
The magnitude and variation of forces and shear stresses, caused by frost heaving in Fairbanks silt and the adfreeze effects of a surface ice layer and a gravel layer, were determined as a function of depth by using electric strain gauges along the upper 2.75 m of a pop pile, 30.5-cm I.D. x 0.95-cm wall, and an H-pile, 25.4-cm web x 85 kg/lineal m. The peak frost heaving forces on the H-pile for three consecutive winter seasons (1982-1985) were 752,790 and 802 kN, respectively. Peak frost heaving forces on the pipe pile of 1118 and 1115 kN were determined only for the second and third winter seasons. Maximum average shear stresses acting on the H-pile were 256,348 and 308 kPa during the thre...
Frost Action in Soils
Frost Action in Soils: Fundamentals and Mitigation in a Changing Climate reviews and updates the state of knowledge on frost-action fundamentals, the impact of climate change, and mitigation of frost action on pavements and other structures.
Reduction of Frost Heave by Surcharge Stress
The results of a six-year field test program conducted near Fairbanks, AK, to investigate the reduction in frost heave obtained by applying a surcharge stress on the soil are presented. Seasonal heaves of 25-ft-square test sections with nominal surcharge loads of 2, 4, 6, and 8 psi were compared with heaves at adjacent unloaded sections. The test sections were on a silt soil in an area where permafrost existed at about a seven-ft depth. Results showed that only a small surcharge load was needed to cause significant reductions in heave. Data are included that indicate that heave reduction was achieved by minimizing groundwater migration. A method for correlating field and laboratory rate-of-heave data is suggested. (Author).
Geography
Plate tectonics - Earthquakes and volcanoes - Weathering and slopes - Glaciation - Coasts - Deserts - Weather and climate - Soils - Biogepgraphy - Population - Urbanisation - Farming and food supply - Rural land use - Energy resources - Manufacturing industries - Transport and interdependence - World development.
Geotechnical Engineering Handbook, Procedures
Volume 2 of the Handbook covers the geotechnical procedures used in manufacturing anchors and piles as well as for improving or underpinning foundations, securing existing constructions, controlling ground water, excavating rocks and earth works. It also treats such specialist areas as the use of geotextiles and seeding.
Frost heaving of tree seedlings
Describes phenomenon. Suggested methods of control involve lowering freezing point of soil water or restricting water flow through soil to freezing front.
