Design And Application Of Retaining Piles Working As An Anti-floating Method

With the fact that underground structures broadly developed and made use of in projects, It is not uncommon to know accidents by the lack of anti-floating, so it is very necessary and important to select reasonable and economic anti-floating designs when it is needed. The designs of anti-floating of underground structures mainly contain two types:one type is basic on resistance; The other is cutting and reducing. Basis on summarizing commonly used anti-floating methods in projects, a new method called retaining piles working as an anti-floating method is proposed. Focused on the method, a few tasks and several conclusions are made as followings:1.Some conclusions are found from comprehensively analysis and summarizing the norms and achievements of predecessors:when retaining piles working as an anti-floating method is applied in projects, the buoyance calculation of underground structure and the values cut or not are defined according to the synthesis consideration of actual situations of the project and the relationship between the location of the underground structure and the water-bearing stratum. The anti-floating buoyance calculation of underground structure takes the rubbing effects between soil and the sides of wall of the underground structure and the cohesive actions between soil and the basal plate not into account.2. Summarizing the characteristics of retaining piles working as an anti-floating method, there kinds of feasible structure models of retaining piles working as an anti-floating method are proposed.After comparing these there models from four aspects,they are: structure and internal force analysis,crack checking, calculation of deformation and the difficults degree of construction,the relative better model is chosed. Applying the retaining piles is more economical than the traditional method of anti-floating, deduce the underground structure length, width restriction condition.3. Regarding the selected model as the subject, design its structure and make efficiency analysis.Through calculations of the connected component,it is found that the number of piles between two connected components is controled by the crack checking. Combining Jingzhou under Beijing road and insufficient anti-uplift defent engineering examples, the retaining piles of resisting the retaining piles by further proved the feasibility of settling technology.4. The problems of applying the retaining piles working as anti-floating method should be solved are summarized, and the development of new technology is prospected.