Understanding Bearing Capacity of Piles in Soil Mechanics and Foundation Design
Explore the concepts of bearing capacity of piles in soil mechanics and foundation design, covering dynamic and static formulas, pile loading tests, and factors influencing bearing capacity calculations for different soil types like clay and sand. Learn about key parameters such as ultimate bearing capacity, hammer weight, drop height, soil penetration, and elastic compressions.
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Presentation Transcript
Soil Mechanics and Foundation Design (2) 312 ( 4 ) :
Bearing Capacity of Piles a) By Dynamic Formulae b) By Static Formulae c) By pile Loading Test Dynamic Equation Engineering News Formula: Pu = Wh*h S+C where
Pu = the ultimate bearing capacity of pile Wh = weight of hammer h = height of drop S = the penetration in soil or the settlement due to the drop C = the elastic compression ( elastic compression in cap + elastic compression in pile + elastic compression in soil). Ppile = Pu/F F = factor of safety = 6
Static Formula: Pu = Pbase + Psurface Pbase =part by bearing at end of pile Psurface = part by the pile surface Pbase = Abase * qu qu =bearing capacity of the soil at end of pile Abase = cross sectional area of pile
qu = C*Nc * c + qo *Nq + 0.5**B *N Where:- C= the cohesion qo = overburden pressure c = shape factor Nc - Nq and N are bearing capacity factors The third part (0.5* *B *N ) can be taken = zero For clay soil Nc * c =10 and Nq from table qo= *D
For sand:- C = zero qu = qo *Nq Psurface:- Foe clay:- Psurface = Ca * { premeter * L} Where Ca= the adhesion = *c = 0.6 o.9
