Research On Performance And Regional Applicability Of The Double-Row Piles Retaining Structure System

Since the double-row piles supporting structure has been using in the foundation project of our country for the last 20 years, because of its many advantages, the support structure has been widely used in the city foundation pit supporting design. Such as, for high rigidity, it doesn’t need other inner supporting measure; Not only it can provide the necessary rigidity to control deformation while excavating foundation but also it doesn’t need to construct behind cable in order to control the deformation of foundation exceed the alarm value; What’s more, because of without inner supporting measure, this types of supporting structure is more convenient to conduct the constructing, especially for the machinery construction. So far, there has been many success cases used in the foundation Supporting project in our country.However, the theory of computation for double-row piles supporting structure is not identical and each theory of computation has its own limitation. While choosing these critical factor, such as the distance between front and behind row, the length of pile, the stiffness of pile, there isn’t a precise standard and is more refer to experience and human factors. Although there has been so many successful examples about the double-row piles supporting structure using, its using in some specific area still needs to do some researching.In view of the above problem, The research contents of this paper are as follows:Browsing and Reading large numbers of relevant literature, summarizing the research status at home and abroad for double-row piles supporting structure, analyzing and summarizing the various calculation methods, which is widely recognized Currently, and their advantages and disadvantages of double-row piles supporting structure;Using GTS nx finite element software to establish 3D finite element model to analysis the impact to the bracing characteristic while the critical factor, such as the distance between front and behind row, the length of pile, the stiffness of pile, is changed.By calculating and analyzing a project instance, theoretically demonstrated the feasibility applications of the project in Xi’an loess and sand interaction area, and according to the calculating results, designed the measuring points laid of site monitoring measurement programs.