Gabion river walling is designed as a mass gravity structure, however if the river water levels are variable then the wall should be designed on the basis that the soil is saturated and the possibility of residual hydrostatic pressures as a result of rapid draw down must be considered.
The wall foundation must be protected against under scour by either of the means detailed below. For scour aprons the width of mattress protection in front of the wall should be 1.5 to 2 times the anticipated depth of scour and for embedment solutions the depth should be greater than the anticipated scour depth.
If adequate scour protection is not given failure by rotatation or settlement of the wall will occur. |
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