What distinguishes bored pile capacity from driven pile capacity?

Bored piles (drilled shafts) have lower unit skin friction due to stress relief and smear during drilling compared to driven piles. The FHWA Drilled Shafts Design Manual (O'Neill & Reese, 1999) provides α-method values for clay and β-method for sand. End bearing is reduced by a factor for base disturbance unless post-grouted.

When are bored piles preferred over driven piles?

Bored piles are preferred in urban environments (noise, vibration constraints), when large diameters or depths are required, in hard rock, or when inspection of the shaft is needed. They can be socketed into bedrock for high capacity per CSA A23.3 and IBC requirements.

Bored Pile Capacity Calculator

Calculate axial capacity of bored (drilled shaft) piles using unit skin friction and tip resistance for cohesive and granular soils per FHWA Design Manual.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How It Works

Calculate axial capacity of bored (drilled shaft) piles using unit skin friction and tip resistance for cohesive and granular soils per FHWA Design Manual

Each component has a specific meaning:

Unit skin friction — The unit skin friction recorded for the patient or scenario being assessed.
Tip resistance — The tip resistance recorded for the patient or scenario being assessed.

Note: Interpret the bored pile capacity result against the clinical thresholds and context described above.

How to Use

Enter the unit skin friction, tip resistance for the patient or scenario you are assessing. Calculate axial capacity of bored (drilled shaft) piles using unit skin friction and tip resistance for cohesive and granular soils per FHWA Design Manual. Use the bored pile capacity result to inform your clinical assessment.

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Frequently Asked Questions

What distinguishes bored pile capacity from driven pile capacity?

When are bored piles preferred over driven piles?