LAB ACTIVITY2 REFLECTION SPOTS LBD Wilma Fernandes Associate

LAB ACTIVITY-2 REFLECTION SPOTS & LBD Wilma Fernandes, Associate Prof in Civil Engineering , Goa College of Engineering , Farmagudi Fd. P 101 X -Lab Activity 2 -7 th oct 2018

REFLECTION SPOT ACTIVITY • Reflection spots: Q. You are designing a foundation on a clayey soil overlain by a sandy soil with the ground water table midway between the ground surface and base of the footing , how will you estimate the bearing capacity of a footing 2 m x 3 m founded at a depth 2 m and estimate the settlement of the footing • 1. Find bearing capacity-check soil properties –find settlement ü 2. Check soil properties-apply correction factors for Water table -find bearing capacity –find settlement • 3. Check soil properties- -find bearing capacity –apply correction factors for Water table - find settlement Fd. P 101 X -Lab Activity 2 -7 th oct 2018

Lb. D ACTIVITY q. How is the settlement calculated for different soil conditions. • 1. Initial , primary consolidation , secondary compression settlement for all soil conditions ü 2. Initial settlement only for cohesionless soils • 3. Initial settlement only for cohesive soils q. How does the position of GWT influence the bearing capacity of footing ØIf at ground level or at a considerable depth below base of footing , reduces the bearing capacity of foundation ØHas effect on the bearing capacity of foundation at a considerable depth üReduces the bearing capacity at the ground level , has no effect on the bearing capacity of foundation at a considerable depth (Hint: considerable depth=at a dist equal to the width of footing from its base) Fd. P 101 X -Lab Activity 2 -7 th oct 2018