Shaking Table Model Test And Analysis Of The Sheet-Pile Structure Under Earthquake

Due to its complex geological and geographical conditions, the southwest region has the highest frequency of strong earthquakes within mainland China. Yu-meng railway lies in strong earthquake region(8 degree),where a lot of sheet-pile retaining walls are used. Sheet-pile retaining wall develops from the anti-slide pile,. And can be used to support the cut and the embankment in the general region, flooding region and the seismic region, as well as the landslide region. Combing with "Test Study of Expansive Soil Cutting Retaining Structure in Strong Earthquake Region",this paper studies the structure of sheet-pile retaining wall under earthquake.Based on the referrence to relevant information and documents abroad and at home, Firstly the paper sums up the research status of the pile-soil dynamic interaction, and the theoretical research situation of the pile-sheet structure, as well as the development status of the structure's form, it also gives a brief analysis on the difficulties and the problems exsited in its pratical implementation. Additionally it summarizes the research status of the distribution diagram of landslide thrust abroad and at home, and expatiates the design theories and calculation methods of the sheet-pile retaining structure.Secondly, taking the double-row pile-sheet retaining wall on Yu-meng railway DK125+020 as the reference research object and using NPIC's large-scale earthquake simulation test bed, a shaking table model test is performed to study and analyse the difference of the pile body's stress and displacement and the soil's acceleration under different loading modes (static,0.1gx,0.2gx,0.3gxz,0.4gxz,0.5gxz,0.7gxz,0.9gxz), and to analyse the different retaining effect between the single-row pile-sheet structure and the double-row pile-sheet structure.Finally, through theoretical calculation and the inverse calculation of the test value, the paper compares and analyses the piles'retaining situation between the single-row pile-sheet structure test model and the double-row pile-sheet structure test model under different loading modes (static 0.1gx,0.2gx,0.3gxz,0.4gxz,0.5gxz). Based on the above all, it focuses on the ratio of the upper pile's retaining force to the total landslide thrust in the double-row pile-sheet structure test model, and puts forward the different bearing ratio between the upper pile's retaining force and the lower pile's retaining force to the total landslide thrust in the double-row pile-sheet structure test model.Through the research above, some laws about the stress of the front and back of the pile, the soil's acceleration and the displacement of the pile's head under the static load and different seisic forces. additionally, through the comparison between theoretical calculation and the inverse calculation of the test value, the different bearing ratio between the upper pile's retaining force and the lower pile's retaining force to the total landslide thrust in the double-row pile-sheet structure test model is put forward, which can provide some references for the seisic design of the pile-sheet retaining wall...