Reduction of Frost Heave by Surcharge Stress PDF Download
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Author: George W. Aitken
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 36
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Book Description
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).
Author: George W. Aitken
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 36
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Book Description
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).
Author: Lawrence D. Johnson
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 122
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Book Description
Author: William J. Wuest
Publisher:
ISBN:
Category : Coal mines and mining
Languages : en
Pages : 28
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Book Description
Author:
Publisher: DIANE Publishing
ISBN: 1428914595
Category :
Languages : en
Pages : 39
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Book Description
Author: Lawrence D. Johnson
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 206
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Book Description
Author: Jerome B. Johnson
Publisher:
ISBN:
Category : Frost heaving
Languages : en
Pages : 64
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Book Description
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 three winter seasons. Maximum average shear stresses acting on the pipe pile were 627 and 972 kPa for the second and third winter seasons. Ice collars were placed around the tops of both piles during the first and third winter seasons to measure the adfreeze effects of a surface ice layer. The ice layer may have contributed 15 to 20% of the peak forces measured on the piles. A 0.6-m-thick gravel layer replaced the soil around the tops of both piles for the second and third winter seasons to measure the adfreeze effects of a gravel backfill. The gravel layer on the H-pile may have contributed about 35% of the peak forces measured. Maximum heaving forces and shear stresses occurred during periods of maximum cold and soil surface heave magnitude. These were not related to the depth of frost penetration for most of the winter since forst was present at all depths extending to the permafrost table. (mjm).
Author: James R. Aggson
Publisher:
ISBN:
Category : Buckling (Mechanics).
Languages : en
Pages : 40
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Book Description
Author: Gyeorgos Ceres Hatonn
Publisher: PHOENIX SOURCE DISTRIBUTORS, INC.
ISBN: 9781569350492
Category : Conspiracy theories
Languages : en
Pages : 242
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Book Description
Author: Kevin O'Neill
Publisher:
ISBN:
Category : Finite element method
Languages : en
Pages : 24
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Book Description
Author: Jack D. Leatherwood
Publisher:
ISBN:
Category : Dynamics
Languages : en
Pages : 36
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Book Description
An analytical investigation was conducted to determine the basic heave response characteristics of a plenum-type tracked air-cushion vehicle as a function of vehicle operating parameters. In addition to determining basic characteristics, the effect of an active lip control system on the vehicle dynamic response was investigated. Nonlinear equations describing the dynamic and thermodynamics tate of the air-cushion system were derived, and the response of the system to sinusoidal perturbations of the guideway was obtained with the use of an analog computer. Results are presented in terms of vehicle-to-guideway motions and vehicle accelerations experienced during fundamental and subharmonic oscillations.
