Question

In case of well foundation, grip length is defined as the

• A. length below the top of the well cap to the cutting edge
• B. length between the bottom of the well cap to the cutting edge
• C. depth of the bottom of the well below the minimum scour level
• D. depth of the bottom of the well below the maximum scour level

Answer 1

The correct option is D depth of the bottom of the well below the maximum scour level

A well needs to be embedded or sunk below the maximum scour level to a required depth so that the resistance from the sides of well is able to withstand the lateral forces acting on the well. The depth of the bottom portion of well from the scour level is called the grip length. At the time of the selection of depth of foundation, the grip length and bearing capacity of soil strata must be considered. The maximum and minimum base pressures during the drasitc or critical loading conditions have to remain under the permissible range.