Free Web Tool · Geotechnical

Underpinning Load

Distribute an existing wall / column load over underpinning pits or piers and check the underlying soil allowable bearing pressure.

Input

Existing total load P (kN)

Wall span / col tributary (m)

Number of piers

Pier B (m)

Pier L (m)

q_allow (kPa)

Load per pier (kN)—

Pier contact area (m²)—

Pier contact pressure (kPa)—

Utilization q_act / q_allow—

Method

Equally divide P across N piers (assumes flexible distributing element). Check qact = (P/N) / (Bp·Lp) ≤ q_allow.