Application Research Of Pile-anchor Support For Deep Excavation Of Taiyuan Sunshine-city International Plaza

Firstly, this paper briefly introduces the foundation pit engineering and the common supporting structure in our country, and emphatically introduces the concept of the pile anchor support structure. For the deep foundation pit engineering branch support and pile anchor support support background are outlined, current deep foundation pit supporting research status and anchor pile branch nursing research present situation has carried on the analysis of the proposed anchor pile supporting research deficiencies and research significance.Secondly, the mechanism of the pile anchor supporting structure is introduced in detail, and the characteristics of the pile anchor support are emphatically introduced. The mechanism of pile anchor retaining structure system of brief analysis and points out that the pile anchor retaining structure system of force transmission line, has carried on the analysis to the interaction of anchor soil interaction and pile anchor, and points out the cable prestress determination method, and on the earth pressure calculation method and influence the earth pressure are described. Finally, combined with an example of pile anchor support engineering, based on the times of deep foundation pit support engineering example analysis. By introducing the engineering survey, the surrounding conditions and the engineering geological conditions, through the comparison of the project, the final selection of the pile anchor in the form of support for foundation pit engineering. And use Lizheng deep foundation pit calculation software to design of supporting structure of deep foundation pit, obtained the displacement of deep foundation pit and the settlement value, earth pressure distribution, supporting structure internal force distribution of pile and anchor cable reinforcement, and the calculation and analysis of anchor cable, the overall stability checking and anti slip calculation. The calculation results show that the displacement and the stress condition of deep foundation pit can satisfy the design of deep foundation pit, and the application of pile anchor support structure is reasonable and feasible. Combined with engineering case using the Midas software for finite element analysis, conditions for foundation pit excavation process, to a supporting horizontal shift results are analyzed, the variation rules of the structural displacement and axial force of anchor bolt are concluded. The results of numerical analysis and the field test results show that the prestressed pileanchor support system is suitable for the deep foundation pit support engineering.