Question

An isobar is a line which connects all points below the ground surface at which

• A. The local ground elevation is same
• B. The settlement is same
• C. The vertical stress is the same
• D. The ground elevation is varying

Answer 1

The correct option is C The vertical stress is the same

An isobar or pressure bulb is a stress contour or a line which connects all points below the ground surface at which the vertical pressure is the same. In fact, an isobar is a spatial curved surface and resembles a bulb in shape ; this is because the vertical pressure at all points in a horizontal plane at equal radial distances from the load is the same.