What is the bearing capacity of pile?
d. Group behavior. The ultimate bearing capacity of pile groups in cohesionless soil is equal to the number of piles times the ultimate bearing capacity of an individual pile, provided the pile spacing is not less than three pile diameters.
How do you calculate the bearing capacity of a pile?
Step 2: compute the ultimate end bearing capacity (acting as individual piles). 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.
What is the bearing capacity of soil for pile foundation?
2. Site Conditions
| Soil | Thickness (m) | Allowable bearing capacity (kPa) |
|---|---|---|
| Clay | 9.4 | 120 |
| Mild clay | 10.6 | 132 |
| Medium sand | 12.0 | 143 |
| Medium coarse sand | 14.0 | 212 |
What is the allowable bearing capacity?
Allowable bearing capacity: The maximum pressure that can be applied to the soil from the foundation so that the two requirements are satisfied: Acceptable safety factor against shear failure below the foundation. Acceptable total and differential settelement.
How do you calculate the structural capacity of a pile?
Structural Capacity Based on CP4 In CP4, structural capacity (working stress) of nominally reinforced bored piles is calculated using 0.25fcu (ultimate cube strength) but limited to a maximum of 1,088 psi (7.5 MPa).
What is safe bearing capacity?
Safe net bearing capacity ( ) : It is the net soil pressure which can be safety applied to the soil considering only shear failure. Allowable Bearing Pressure: It is the maximum soil pressure without any shear failure or settlement failure.
What is the safe bearing capacity of soil?
Safe Bearing Capacity values of Different Soils
| S.No | Type of Soil | Safe Bearing Capacity ( kN/m2) |
|---|---|---|
| Cohesive Soils | ||
| 1. | Soft shale, hard or stiff clay in a deep bed, dry state | 440 |
| 2. | Medium clay readily indented with a thumbnail | 245 |
| 3. | Moist clay and Sand clay mixture which can be indented by thumb pressure | 150 |
What is C in Terzaghi’s equation?
Terzaghi’s Bearing Capacity Theory Terzaghi developed a method for determining bearing capacity for the general shear failure case in 1943. The equations, which take into account soil cohesion, soil friction, embedment, surcharge, and self-weight, are given below. c′ is the effective cohesion.
What is terzaghi bearing capacity factor?
Terzaghi’s bearing capacity theory: The first term in the equation is related to cohesion of the soil. The second term is related to the depth of the footing and overburden pressure. The bearing capacity factors, Nc, Nq, Ng, are function of internal friction angle, f.