🏗️ AASHTO / FHWA Drilled Shafts (Rock Socket Unit Side Shear q_s & Base Resistance)

Drilled Shaft Rock Socket Calculator

Size large-diameter cast-in-place concrete drilled shafts (caissons) socketed into bedrock under AASHTO LRFD Bridge Design & FHWA GEC-10: calculate rock socket side shear resistance (q_s = 0.65 x Sqrt(q_u compressive rock strength)) and tip end bearing, verify minimum socket embedment length (1.5x to 3.0x shaft diameter), and heavy civil foundation margins.

1. Project & Operating Inputs

Drilled Caissons Cast (Shaft Count e.g. 18 Large Bridge Caissons)

Shaft Diameter (Inches e.g. 48.0" / 4-Foot Diameter Shaft)

Customer Bid Price for Drilled & Poured Caisson ($ / Shaft e.g. $18,500)

Rotary Core Rig, Rock Augers, Rebar Cage, 5,000 PSI Concrete & Labor ($)

2. Financial Breakdown & Yield

AASHTO DRILLED SHAFT CAISSONS

Turnkey Drilled Shaft Package Profit

Heavy Foundation Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost