Application Research And Numerical Analysis Of Rock-socketed Double-row Retaining Pile In Deep Foundation Pit Of Neighboring Lock

With the rapid development of inland navigation, some navigation power junctions have to construct the reserved lock to improve the traffic volumes of waterway and the carrying capacity of the lock. Based on a wide range of considerations, the reserved lock neighbors on the built lock. During the extension construction of lock, foundation pit engineering will influence the built lock in some extent. It could apply retaining structure, dewatering, earth excavating or backfilling to ensure the normal construction of foundation pit, the security of the main structure and surrounding environment escaping damage.The arrangement form of double-row retaining piles was widely applied in foundation pit engineering, however, a special form-the tip of retaining pile embedding in rock, was seldom researched in the way of stress mechanism, working performance and the influence to neighboring buildings. This paper used the method of finite element to simulate the construction process of deep foundation pit, research the characteristics of force and deformation of rock-socketed double-row retaining pile, then get the stress transmission mechanism of double-row retaining piles during the foundation pit excavating and the impacted laws to neighboring lock. The results showed that during the process of foundation pit,it may easily cause the rock in which retaining piles were socketed reaching its yield stress, then the retaining piles generating large horizontal displacement, so affecting the engineering safety.Aiming at the actual engineering of deep foundation pit of neighboring lock, this paper summarized the measures to improve the ability of rock socketed and the influence of various factors on the working performance of retaining piles through comparing the results under the, embedding depth, diameter of pile, stiffness of soil between plies, different distance between double-row piles and different distance between back-row piles. The research conclusions have the reference significance in future researches and practical engineering.