The Research Of Engineering Behaviors On Pile-anchor Supporting Structure In Deep Foundation Pit

In the excavation of foundation pit, the interaction between supporting structureand soil can cause the change of supporting structure performance, it can affect thesafety of the supporting structure state. In order to research change of the supportingstructure with foundation pit excavation, based on the comprehensive analysis ofprevious research methods and results, combined with a deep foundation subject ofpile-anchor supporting structure in“chongwen cabinet”, the engineering behaviors ofsupporting structure was compared and analysed between numerical simulation andresult of real monitoring in this paper. Main contents can be summarized as follows:1. The paper generalized the current studying of pile-anchor supporting structurefrom numerical simulation, theory analysis and calculation, field and laboratory tests.Design and calculation theories of deep foundation pit were discussed. Mechanism ofdeformation pit and influence factors in foundation pit were analyzed.2. The calculation model of pile-anchor supporting structure was established bymeans of software FLAC3D based on“chongwen cabinet”. Displacement of pile top,soil displacement after pile, variety of pile body and prestressed anchors’s axial stresswere discussed. The displacement rules of piles in different excavation were obtained.Axial stress distribution and rules on prestressed anchors were discussed and analyzedin foundation pit excavation.3. For engineering measurements, combined with field data of the displacementin pile and soil, the similarities and differences were obtained from the analysis andcontrast of the data between numerical simulation and actual measurement. It canverify the foundation is safe or not and give some reference to similar engineering.