What is the Hiley formula?

The Hiley formula is: R = Whη/(S + C/2) where R is the ultimate driving resistance in kN W is the weight of the ram in kN.

How do you calculate end bearing capacity?

Ultimate end bearing capacity in clay = Nc × C × pile tip area (Nc = 9). Ultimate end bearing capacity in soft clay = 9 × 120 × π × diameter2/4 = 848.2 lbs/per pile. Total ultimate bearing capacity per pile = 76,920 + 848.2 = 77,768 lbs.

How do you calculate drop hammer weight?

Weight x Height = Energy Page 31 Impact energy delivered per blow by a drop hammer is calculated simply by multiplying the weight of the hammer times its height of fall. A drop hammer weighing 3,000 lb. falling from 20-feet with no bounce at impact would deliver 60,000 ft-lbs of energy.

What are the two types of dynamic formula?

Dynamic formulae are used for driven piles. Static formulae are used both for bored and driven piles.

What is converse Labarre equation?

For calculating the bearing capacity of pile group, load carrying capacity of the individual pile need to be multiplied by number of piles. Labarre Equation relate load carrying ability of group piles to total of individual pile capacities through a group efficiency parameter. …

What is the unit of bearing capacity of soil?

The bearing capacity of foundation is the maximum load per unit area which the soil can support without failure. It depends upon the shear strength of soil as well as shape, size, depth and type of foundation.

What will be the shape of footing if a 0?

qs, if a= 0 we have a triangle with x̅ = L/3.

When should we use piles?

Pile foundations are principally used to transfer the loads from superstructures, through weak, compressible strata or water onto stronger, more compact, less compressible and stiffer soil or rock at depth, increasing the effective size of a foundation and resisting horizontal loads.

What are the two types of dynamic Formulae?

Is the Hiley formula accurate for saturated silts?

NB: the accuracy of the Hiley formula reduces with increasing pile length and it does not give an accurate prediction of pile capacity in saturated silts, muds or clays. (Note that some publications also refer to the Engineering News Formula, which is used in the USA.

How is the bearing capacity of a soil determined?

In non-cohesive soils the probable bearing capacity may be deduced from one of the dynamic pile formulae. However, many of these are very unreliable and it is recommended that an approximatevaluemaybe obtained from theHiley formula in accordance with Item 3.82.

How to calculate the value of the Hiley formula?

In calculating thevalueofthedrivingresistancefrom the Hiley formulait is first necessarytoassumea value for the cross-sectional stress and to obtain the corresponding value of C.

How to calculate the bearing capacity of a pile?

The relation suggested by Hiley for ultimate bearing capacity of the pile is: c = Sum of elastic compression ( c = c p + c c + c q) It should be noted that depends on the coefficient of restitution, which is given in Table 2, being obtained from Fig.2. Hammer coefficient is given in Table 1

What is the Hiley formula? The Hiley formula is: R = Whη/(S + C/2) where R is the ultimate driving resistance in kN W is the weight of the ram in kN. How do you calculate end bearing capacity? Ultimate end bearing capacity in clay = Nc × C × pile tip area (Nc =…