Spread footings on "reinforced" soil

1970 ◽  
Vol 7 (3) ◽  
pp. 318-326
Author(s):  
B. O. Kuzmanović ◽  
À. Balla
Keyword(s):  
Bearing Capacity ◽  
Wall Thickness ◽  
Thick Layer ◽  
Model Tests ◽  
Reinforced Soil ◽  
Stress Conditions ◽  
Sheet Pile ◽  
Medium Quality ◽  
Spread Footings ◽  
Horizontal Displacements

In case of foundations on thick layer of weak or medium quality, short tubes or sheet-pile mantles encompassing the footings and of small wall-thickness driven into the ground can increase considerably the bearing capacity of the soil. The footings are in this way artificially deepened and the horizontal displacements of the subsoil within the tube or mantle are confined. Thus, only vertical compression is possible within the "reinforcement" of the soil. The paper produces theoretical solution for the stress conditions and vertical settlement. Two illustrative examples with model tests are also included.

scholarly journals Projected decrease in wintertime bearing capacity on different forest and soil types in Finland under a warming climate

2019 ◽  
Vol 23 (3) ◽  
pp. 1611-1631 ◽  
Author(s):  
Ilari Lehtonen ◽  
Ari Venäläinen ◽  
Matti Kämäräinen ◽  
Antti Asikainen ◽  
Juha Laitila ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
21St Century ◽  
Climate Model ◽  
Thick Layer ◽  
Timber Harvesting ◽  
Snow Accumulation ◽  
Point Of View ◽  
Frozen Soil ◽  
Soil Types ◽  
Soil Frost

Abstract. Trafficability in forest terrain is controlled by ground-bearing capacity, which is crucial from the timber harvesting point of view. In winter, soil frost affects the most the bearing capacity, especially on peatland soils which have in general low bearing capacity. Ground frost similarly affects the bearing capacity of forest truck roads. A 20 cm thick layer of frozen soil or 40 cm thick layer of snow on the ground may already be sufficient for heavy forest harvesters. In this work, we studied the impacts of climate change on soil frost conditions and, consequently, on ground-bearing capacity from the timber harvesting point of view. The number of days with good wintertime bearing capacity was modelled by using a soil temperature model with a snow accumulation model and wide set of downscaled climate model data until the end of the 21st century. The model was calibrated for different forest and soil types. The results show that by the mid-21st century, the conditions with good bearing capacity will decrease in wintertime in Finland, most likely by about 1 month. The decrease in soil frost and wintertime bearing capacity will be more pronounced during the latter half of the century, when drained peatlands may virtually lack soil frost in most of winters in southern and western Finland. The projected decrease in the bearing capacity, accompanied with increasing demand for wood harvesting from drained peatlands, induces a clear need for the development of sustainable and resource-efficient logging practices for drained peatlands. This is also needed to avoid unnecessary harvesting damages, like rut formation on soils and damage to tree roots and stems.

scholarly journals MODEL TESTS OF INSTALLATION AND BEARING CAPACITY OF SCREWED PILES

2007 ◽  
Vol 72 (620) ◽  
pp. 75-80 ◽  
Author(s):  
Tsutomu TSUCHIYA ◽  
Fumikazu OHSUGI ◽  
Futa NAKAZAWA ◽  
Masao SHIMADA
Keyword(s):  
Bearing Capacity ◽  
Model Tests

scholarly journals The Performance of Tied-Back Sheet Piling in Clay

1972 ◽  
Vol 9 (2) ◽  
pp. 206-218 ◽  
Author(s):  
G. C. McRostie ◽  
K. N. Burn ◽  
R. J. Mitchell
Keyword(s):  
Field Measurements ◽  
Triaxial Tests ◽  
Deep Excavation ◽  
Sheet Pile ◽  
Vertical Movements ◽  
Field Situation ◽  
Stress Changes ◽  
Temporary Support ◽  
Current Design ◽  
Horizontal Displacements

In Ottawa in 1969 a tied-back sheet pile wall was installed to provide temporary support in one side of a 12 m deep excavation through Champlain Sea deposits to shale bedrock. The wall was designed to permit as little yield as possible in order to safeguard the vital operation of an adjacent transformer building.To assess the performance of this structure, measurements of vertical movements of the surface adjacent to the wall, horizontal displacements of the wall, tendon loads and ground-water pressures were made as the excavation progressed.A series of triaxial tests was carried out in the laboratory to determine the form and magnitude of soil deformations under stress changes approximating those derived from the field measurements. Reasonable correlation is obtained when the results of these tests are used to estimate soil displacements in the field situation. The measured tendon loads are compared with those that would be expected using current design methods.

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