Clean sound rock 29-31 Clean gravel, gravel- sand, coarse sand 24-29 Clean fine to medium sand, silty medium to Coarse sand, silty or clayey gravel 19-24 Clean fine sand, silty or clayey fine to sand 17-19 Fine sandy silt, non plastic silt 22-26 very stiff and hard residual or pre-consolidated clay 17-19 Medium stiff and stiff clay and silty clay Steel sheet pile against: 22 17 Clean gravel, gravel-sand mixture well graded rock fill with Spalls 14 Clean sand, silty sand-gravel mixture, single-size hard-Rock fill 11 Silty and gravel or sand, gravel or sand mixed with silt or Clay Fine sandy silt, non plastic silt Formed concrete or concrete sheeting against: 22-26 Clean gravel, gravel-sand mixtures, well graded rock fill 17-22 With spalls 17 Clean sand, silty sand mixture, single size rock fill –gravel 14 Silty sand, gravel or sand mixed with silt or clay Fine sandy silt, non plastic silt Various structural materials: 35 Masonry on masonry, igneous and metamorphic rocks: 33 Dressed soft rock on dresses soft rock 29 Dressed hard rock on dresses soft rock 26 Dressed hard rock on dresses hard rock 17 Masonry on wood (dross grain) 14-16 Steel on steel at steel-pile interlocks Wood on soil Pile Groups General Pile foundation rarely consists of a single pile. Generally, there will be a minimum of two or three piles under a foundation element or footing to allow for misalignments and other inadvertent eccentricities. Building codes may stipulate the minimum number of pile
Clean sound rock Clean gravel, gravel- sand, coarse sand Clean fine to medium sand, silty medium to Coarse sand, silty or clayey gravel Clean fine sand, silty or clayey fine to sand Fine sandy silt, non plastic silt very stiff and hard residual or pre-consolidated clay Medium stiff and stiff clay and silty clay Steel sheet pile against: Clean gravel, gravel-sand mixture well graded rock fill with Spalls Clean sand, silty sand-gravel mixture, single-size hard-Rock fill Silty and gravel or sand, gravel or sand mixed with silt or Clay Fine sandy silt, non plastic silt Formed concrete or concrete sheeting against: Clean gravel, gravel-sand mixtures, well graded rock fill With spalls Clean sand, silty sand –gravel mixture, single size rock fill Silty sand, gravel or sand mixed with silt or clay Fine sandy silt, non plastic silt Various structural materials: Masonry on masonry, igneous and metamorphic rocks: Dressed soft rock on dresses soft rock Dressed hard rock on dresses soft rock Dressed hard rock on dresses hard rock Masonry on wood (dross grain) Steel on steel at steel-pile interlocks Wood on soil 29-31 24-29 19-24 17-19 22-26 17-19 22 17 14 11 22-26 17-22 17 14 35 33 29 26 17 14-16 Pile Groups General Pile foundation rarely consists of a single pile. Generally, there will be a minimum of two or three piles under a foundation element or footing to allow for misalignments and other inadvertent eccentricities. Building codes may stipulate the minimum number of pile
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