Abstract
ABSTRACT Proper estimation of grip length (foundation depth of pier below maximum scour level) is very important for safety of bridge piers, Lacey's recommendations are used for the design of grip length for bridges in India. Validity of Lacey's recommendation has been investigated by both experimental and analytical approaches. Experiments are conducted to find the stability of pier for three shapes of piers and for two types of median size sediments. Experiments indicate minimum value of grip length <0.2(h+hs), where (h+hs) indicates depth measured below free surface up to maximum scour level. Stability analysis of forces acting on caisson pier for three different cases is carried out. Lacey's recommendation for railway bridge design is in stable zone for the cases considered. However, the Lacey's recommendation for road bridge pier is in stable zone for few cases and for remaining they are in unstable zone. Effect of earthquake forces on stability of caisson piers are not considered in this analysis.
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