Displacement Calculation On The Permanent Flexible Supporting Structure Of Frame With Pre-stressed Anchors

As a new type of retaining structure, frame pre-stressed anchor, with the advantages ofsimple structure, construction safety, small disturbance to the slope, small impact on thesurrounding buildings, saving engineering materials and have an immediate effect on theslope stability or strengthening buildings, has been getting rapid development and wideapplication in recent years. Furthermore, the retaining structure can control the slopedeformation well, and at the same time within the frame can also plant the grass of protection,that is, cast-in-situ reinforced concrete frame in the slope or lay the prefabricated member onthe slope to form the frame and then with anchor fixed the frame, backfill soil and takemeasures to fix the soil in the frame, then plant grass in the frame to achieve the goal ofrevetment and greening.The most important information that the rock and soil excavation and deformation ofslope feedbacked is that the displacement. It can best reflect the slope changing conditionsand developing trends. It can provide sufficient stabilizing force, increase the shear strengthof the potential slip plane，prevent the displacement of the slope effectively, when using theframe pre-stressed anchor to consolidate the slope. This is a mechanical role that the generalretaining structures do not have, it is also the biggest advantage compared with other retainingstructures. But, the force, deformation and the displacement calculation theory of the framepre-stressed anchor flexible retaining structure is still in the development stage and therelevant standards have not yet come up with a sophisticated method for the calculating.Therefore, this article aimed at the lag of the theoretical research and considered the effect ofthe excavation of soil, proposed a new calculation of the slope deformation. The maincontents of the thesis are as follows:（1）Summarized the characteristics of the retaining structure of frame pre-stressedanchor, analysed the action mechanism and force characteristics of frame pre-stressed anchorstructure，and pointed out the problems of frame pre-stressed anchor method in the slopedisplacement research work at present.（2）According to the action mechanism of frame pre-stressed anchor supporting system,posed a simplified calculation mode of the supporting slope of frame pre-stressed anchor.（3）Through the theory of incremental method, we can work out the axial force of theanchor. Divided the deformation of the slope supporting structure anchor location into theelastic deformation of the anchor free section, the tensile deformation of the anchoringsegment and the shear deformation between the anchoring section and soil, then calculate and analyze the controlling effect of slope displacement.（4） Finally, through an engineering example, calculate the displacement ofreinforcement slope with the method in this paper, and then use FLAC^3Danalysis software offinite difference theory to make mode, with these two deformation results compared andanalyzed, and then further analysed the influencing fators of sope displacement. The resultsshow that the displacement theory, calculating the retaining slope of frame pre-stressedanchor in this paper, is feasible.