Construction of well foundation consists of the following stages: 1. Laying the Cutting Edge 2. Alignment Control 3. Construction of Well Curb 4. Construction of Well Steining 5. Well Sinking. Stage # 1. Laying the Cutting Edge: Well foundations are constructed in stages by sinking under self-weight as well as dredging the soil inside the dredge hole and on the [...]
The depth of a well foundation is decided based on the following three considerations: 1. Maximum scour depth below the highest flood level (HFL). 2. Minimum grip length below the scour level. 3. Allowable bearing capacity. The depth of a well foundation is thus equal to the sum of the maximum scour depth and the minimum grip length. D = [...]
Sinking of wells usually encounters difficulties in the form of tilting and shifting of wells. Tilting is the deviation of the vertical alignment of the well and shifting is the deviation from the horizontal alignment. Tilting and shifting are associative; shifting occurs if tilting is large and uncontrolled. Shifting can be eliminated, if the well is sunk in true vertical [...]