Contrast Test on Load Bearing Behavior of Single Bored Piles Grouted at the Bottom of the Pile

The contrast test includes the site condition design of pile and grouting parameters.The load bearing behavior of single bored piles grouted at the bottom of pile with sand and stone layers is researched.The characteristics of tip resistance and side friction of pile are analyzed.In contrast test,the ultimate bearing capacities of single pile increase about 27%.And the settlement of single pile reduces about 66%.But the rebounding ratio increases about 42%.Moreover,the tip resistance of the pile presents significant rise.The influence about the side friction of upper part of pile is not obvious,but influences the tip and lower part of the pile.