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What Are the Magnitude and Nature of Loads Acting on Foundations?

2013-12-06 570 0人评论
       For the same soil layer, a foundation with a small load may find it an excellent bearing stratum, whereas for a foundation with a large load, it may be unsuitable as a bearing stratum.
　　A foundation subjected to relatively large horizontal loads should have sufficient embedment depth to ensure adequate stability. For example, high-rise buildings, due to horizontal loads such as wind and seismic forces, generally have an embedment depth of no less than 1/15 of the building height above ground. Certain foundations subjected to uplift forces, such as transmission tower foundations, also often require a relatively large embedment depth to ensure the necessary uplift resistance. Certain soils (such as saturated loose fine silty sand) are prone to "liquefaction" under dynamic loads, causing excessive foundation settlement or even loss of stability; therefore, when determining the embedment depth of a foundation, such soil layers should not be selected as the foundation soil for foundations subjected to vibratory loads. In earthquake zones, liquefiable soil layers should not be used directly as the bearing stratum of a foundation.
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