This course will provide you with an introduction to deep foundations. A deep foundation derives its support from competent strata at significant depths below the surface or, alternatively, has a depth to diameter ratio greater than 4. A deep foundation is used in lieu of a shallow foundation when adequate bearing capacity or tolerable settlements cannot be obtained with a shallow foundation. The term deep foundation includes piles, piers, or caissons, as well as footings or mats set into a deep excavation. This publication discusses problems of placing footings and mats in deep excavations and design of drilled piers. Drilled piers (or caissons) are simply large-diameter piles, but the design process is somewhat different. An arbitrary distinction between a caisson and pier is that the caisson is 30 inches or more in diameter. Course Outline 1. GENERAL 2. FLOATING FOUNDATIONS 3. SETTLEMENTS OF COMPENSATED FOUNDATIONS 4 . UNDERPINNING 5. EXCAVATION PROTECTION 6. DRILLED PIERS 7. FOUNDATION SELECTION CONSIDERATIONS This course will give engineers and others an introduction to the types of deep foundations and when they may be applicable.

Learning Objectives

• Learn the definition and design considerations applicable to floating foundations;
• Learn the mechanics of settlement of compensated foundations;
• Learn when there is a likelihood of bearing capacity failure;
• Learn two commonly used procedures to mitigate bottom heave; and
• Learn about settlement issues adjacent to excavations.