Theoretical Analysis And Numerical Simulation Of Double-row Piles With Anchor Supporting System

With the development of economy and city construction, more and more high-rise buildings have sprung up in the city. These top or tall building are gradually making their foundation pit deeper, and growing more complex. At the same time, a growing number of new form of foundation pit supporting also arises at the historic moment. Double-row piles with anchor support system is a new supporting form. It integrates the advantages of double-row piles with anchor. It makes a significant effect and can effectively improve the economic benefit In the aspect of controlling the deformation of foundation pit supporting structure itself. At present, it gets a big progress in the research of double-row piles system, but there are still insufficient in some complex problems. In order to make double-row piles with anchor supporting system can be applied to the engineering practice better, it is necessary to carry out the system of further research.In this paper, double-row piles with anchor supporting system are analyzed in theory in detail. And a numerical simulation analysis of double-row piles with anchor supporting structure by finite element software PLAXIS by taking a super deep foundation pit supporting engineering in guangzhou as the background. And makes a comparation between the simulation results and the monitoring data, the main research contents and research conclusions in this paper are as follows:(1) The technology development and research status of double-row piles structure and double-row piles with anchor structure are overviewed. And the problems existing in the research and application of both are pointed out.(2) Based on the existing research results and the monitoring data, a formula to earth pressure between double-row piles is derived. Through example calculation, it shows that the earth pressure calculation formula derived in this paper can get a very small error between the formula solutions and the solutions from the proportional coefficient method, the formula has certain rationality(3) Based on the earth pressure calculation model in the second chapter and the basic assumptions, a theoretical analysis model and a buckling analysis of double-row piles with anchor supporting structure. The model has a good theoretical basis, but its solving process by hand is heavy,which can be solved by programming means.(4) Based on a deep foundation pit project in guangzhou, makes a simulation analysis for the project construction process by the finite element software PLAXIS, in order to deep analyze the displacement of the foundation pit, and internal force and deformation laws of pile body under the conditions of double-row piles with prestressed anchor supporting structure. At the same time, by comparing the results of numerical simulation and field monitoring data, the rationality of the simulation results are verified.(5) By changing the design parameters such as row space, pile body’s stiffness, link-beam’s stiffness, prestressed size and embedded depth of double-row piles with anchor supporting structure, the characters of double-row piles with anchor supporting structure is analyzed. Finally the orthogonal test analysis is maked to explore the influence to the deformation of significance from factors selected. It shows that the influence to lateral deformation of double-row piles supporting engineering from the prestressed size was the most obvious among the selected factors and levels through orthogonal analysis, but the influence degree to the index from the pile body’s stiffness is the least.