Influence of Goaf at Pile Tip on the Bearing Capacity of Rock-socketed Piles
In view of the challenges posed by the goaf at the pile tip to the design of rock-socketed piles(such as load-bearing per-formance and long-term service performance),a scaled model test was conducted using the rock-socketed piles in the goaf of the Du-jiashan Super Bridge as a prototype.A scaled model test was conducted to study the bearing capacity of single pile at different distances from the goaf to the pile tip and whether the goaf was grouted or not.The scaled parameters were calculated and appropriate test materials were selected for model construction.Through multi-level load tests,the changing characteristics of pile top settlement,pile axial force,pile tip resistance and pile side friction at different distances from the goaf to the pile tip and after grouting were obtained.And the bearing characteristics of rock-socketed piles without goaf were comparatively analyzed.The results show that as the distance from the goaf to the pile tip decreases,the bearing capacity of the model pile tip bearing layer decreases,which is not conducive to the bearing capacity of the model pile.After grouting,the bearing capacity of the pile tip bearing layer is significantly increased,resulting in a significant reduction in pile top settlement of the model pile and a significant increase in bearing capacity.
rock-socketed pilesgoafmodel testpile top settlementpile axial forcepile tip resistancepile side friction
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