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Negative Skin Friction

Negative Skin Friction is calculated as follows:
:‫ﯾﺘﻢ ﺣﺴﺎب اﻻﺣﺘﻜﺎك اﻟﺴﻠﺒﻰ ﺑﯿﻦ اﻟﺘﺮﺑﺔ واﻟﺨﻮازﯾﻖ ﻛﺎﻟﺘﺎﻟﻰ‬

-ve skin friction = Weight of soil bounded within the soft layers;
+ Pile group surface area of the soft layers * pile-soil
adhesion (Ca)
+ ‫اﻻﺣﺘﻜﺎك اﻟﺴﻠﺒﻰ = وزن اﻟﺘﺮﺑﺔ اﻟﻤﺤﺎطﺔ ﺧﺎرﺟﯿﺎً ﺑﻤﺠﻤﻮﻋﺔ اﻟﺨﻮازﯾﻖ‬

‫اﻟﻤﺴﺎﺣﺔ اﻟﺴﻄﺤﯿﺔ ﻟﻤﺠﻤﻮﻋﺔ اﻟﺨﻮازﯾﻖ اﻟﻤﻼﺻﻘﺔ ﻟﻠﻄﺒﻘﺎت اﻟﻀﻌﯿﻔﺔ‬
‫* ﻣﻌﺎﻣﻞ اﻻﻟﺘﺼﺎق ﺑﯿﻦ اﻟﺨﻮازﯾﻖ واﻟﺘﺮﺑﺔ اﻟﻤﺤﯿﻄﺔ ﺑﮭﺎ‬

The negative skin friction per pile should not exceed the pile
skin friction value.
.‫ﺑﺤﯿﺚ ﻻ ﯾﺘﻌﺪى اﻻﺣﺘﻜﺎك اﻟﺴﻠﺒﻰ ﻟﻠﺨﺎزوق اﻟﻮاﺣﺪ ﻗﺪرة اﻻﺣﺘﻜﺎك اﻟﺴﻄﺤﻰ ﻟﺬﻟﻚ اﻟﺨﺎزوق‬

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Laterally Loaded Piles

A vertical pile resists a lateral load by
mobilizing passive pressure in the soil
surrounding it.

The degree of distribution of the soil’s
reaction depends on:

1) the stiffness of the pile,
2) the stiffness of the soil, and
3) the fixity of the ends of the pile.

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