Belled After Grouting Pile-site Pilot Study

The cast-in-situ pile with expanded-base and post-pressure grouting is a new type of pile foundation developed from normal cast-in-site pile, in which the construction techniques of expanded-base and post-pressure grouting are combined.Based on the static loading test and stress testing of piles in situ of the project "Taiyuan second long-distance telegraphic hinge", some researches below have been conducted in this paper. The paper consists of the following two parts: the comparisons of load transfer feature of the resistance among the four types of piles (that is, the normal cast-in-situ pile, the cast-in-situ pile with post-pressure grouting, the cast-in-situ pile with expanded-base. the cast-in-situ pile with expanded-base and post-pressure grouting), the bearing capacity of piles affected respectively by the two types of construction technique. The results of researches prove that by comparison with normal one. the cast-in-situ piles with expanded-base and post-pressure grouting have the advantages of low settlement and high bearing capacity. The results of this paper may be referred to the design and engineering application of this new type of pile.