Review article

Estimation of the efficiency of the method for increasing the pile capacity








Interface friction of soils and underground structures of buildings is the main mechanism for transferring loads from the building superstructure to the foundation base. The total pile bearing capacity directly depends on the pile capacity value in soil. The stability of the enclosing structures depends on the active and passive effects of the soil. It all depends on the soil friction parameters regarding the pile material. This article describes a method for increasing the bearing capacity of the underground structures and presents an inter-comparison analysis of this method with currently used methods. This method consists of creating roughness on the surface of the structure which is in contact with the soil. The feature of the method is that the development of the surface does not entail changes in the design scheme and, as a result, does not complicate the calculation method, whereas the alternative methods existing presently, such as using ribbed piles, have a more complex design scheme. In addition to the tangential forces of soil resistance, normal forces also appear on the edges of the pile. The effectiveness of the proposed method has been evaluated by laboratory tests. The tests` description is given. During the testing, the parameters of interface friction of thawed soils and the adhesion of frozen soils with different materials were determined. Samples of metal with a factory surface and samples reinforced by using the proposed method were taken for comparison. The obtained results of the study demonstrate the effect of strengthening the structure surface: pile capacity has increased by 53 %.


Boyarintsev A. V. Saint Petersburg State University of Architecture and Civil Engineering St. Petersburg, Russia

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