Study On The Mechanism Of The Retaining Structure Combined Of Anti-slide Pile And Retaining Wall

As the highway in the mountainous area of the western China is constructed on a large scale, many high fill and steep or transverse embankments occur in the practical engineering. Prior to construct the embankment, the slope embankment retaining structure should be installed. In order to meet the requirement to fill the high fill and steep or transverse embankments, based on views of anti-slide pile and tenon retaining walls, a combined retaining structure(CRS) is proposed to combine the anti-slide pile and the retaining walls in the application of bank slope in this thesis. Currently, many studies deal with the anti-slide pile or the retaining walls, whereas the study about the combination of the anti-slide pile and the retaining walls is not reported in details, especially for the interaction mechanism between the anti-slide pile and the retaining walls of the CRS. Therefore, in this thesis, based on the numerical analysis and the theoretical calculation, the interaction mechanism between the anti-slide pile and the retaining walls of the CRS is analysed.On the basis of a project case of the bank slope in a particular highway, a three dimensional finite element model is established by the commercial finite element software ANSYS. For sake of the brevity, according to the soil property, the landslide thrust is approximated by a variety of standard distribution functions, the internal force, the displacement, the stress distribution, the load sharing ratio and the bearing capacity are analysed with different working conditions. The simulation result indicates that: the landslide thrust exerts considerable influence on the load sharing ratio and the bearing capacity of the CRS; the stress and displacement increase as the thrust force increases, and the stress distribution is greatly varied while the thrust force increases.Based on the analysis of the mechanical response of the anti-slide pile, the stress in the anti-slide pile by the simplification method of classic cantilever pile is calculated. By comparing the theoretical calculation, the field test data, and the numerical analysis, the stress distribution of the anti-slide pile in the CRS is investigated. The result indicates that: an excellent agreement can be observed in the results by the theoretical calculation, the field test and the numerical analysis. Therefore, the analysis of the interaction mechanism between the anti-slide pile and the retaining walls of the CRS by the three dimensional finite element model is reasonable and reliable.