Analysis on Effect of Pressurer Grouting at the End of Bored Piles by Model Test

Through indoor model test about the pile-grouted,actualized static load test and excavation of observation of the pile,this paper discussed the impaction of the size and solid form and grouting parameters for the characteristics of single pile bearing capacity,analyzed the load transfer characteristics and changes trend of the pile tip resistance,lateral load resistance with the load increased.The result shows that grouting quantity,grouting pressure,perfusion character of stratum are the main factors influencing the solid characters.The composite pile formed by the slurry backwash to the soil around the pile has greater impact on the pile of lateral friction.The more the diameter of the pile expands,the more the side of lateral friction increases.Post-grouting at end of pile changes the bearing characteristic of pile,conventional pile exhibits the character of friction-end bearing pile,the pile of post-grouting at end exhibits the character of end bearing pile.