Application of Self-balanced Test in the Bearing Capacity of Foundation Piles of PBA Station
With the rapid development of rail transit construction,pile beam arch(PBA)method are applied in most of the subway stations in the core area of urban core areas.The most important thing for the station by dual-layer four-guide hole method is the construction of the middle and side piles.Under the action of the construction of the side pile beams at the upper guide-hole and station buckle,the middle pile is used as a temporary component to bear the upper structure load.Therefore,requirements for mid-pile bearing capacity are higher.The stile piles are used as permanent components of the station.The bearing capacity of the mid-pile and the side pile are related to the structural safety.In order to test whether the actual bearing capacity of the base pile meets the design requirements,a static load test is needed.The methods of traditional stacking method and anchor pile method cannot be imple-mented in the PBA dark excavation station,so the self-balanced method are applied.Selected the side pile B3 of a PBA excavation station,the load box are buried in the reinforcement cage to conduct a self-balanced base pile bear-ing capacity test to get the Q-s curve of the upper and lower piles.Finally,the bearing capacity of the pile meets the design regulations by equivalent conversion.
rail transitpile beam arch(PBA)methodself-balanced methodbearing capacity of foundation pile
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