Numerical Nonlinear Analysis Of Soil Nailing Wall

In this thesis, analysis of whole performance and interior mechanism of plain soil slope and soil nailing wall with FLAG finite difference program has been carried out. At the same time, the impacts on the internal force distribution of soil nailing and the deformation of soil nailing wall of many factors, including the connection between face shield and soil nailing, the friction decline between soil nailing and soil, the shear force & bending moment resistance of soil nailing, the cement crack in soil nailing, face shield, excavation, the obliquity of slope, and so on are studied in this thesis. The study results reveal some laws:(1) Two failure modes exist in different obliquity slope and influence the internal force of soil nailing;(2) The connection between face shield and soil nailing determines the distribution of the axial force along length;(3) The influence of face shield involves its connection with soil nailing and its stiffness on soil nailing wall;(4) The transversal effect of soil nailing depended on the joint of nail head is little;(5) The maximum axial forces of other soil nailings except the first soil nailing increase gradually with excavation.In addition, the soil nailing wall is computed and analyzed with cross-over experiment including four factors, soil nailing's length, interval, obliquity and connection between face shield and soil nailing, and two levels each factor. As a result, the influence of designed parameters of soil nailing is different evidently, and the deformation of soil nailing wall decreases largely when prominent factors are taken into account. In the end, according to the maximum axial force distribution curve under different conditions, a new method is put forward to improve the currentdesign and calculation methods of soil nailing. On the basis of these analyses, the numerical model of a real civil work is built by FLAC, and its results are compared with survey results in site, which indicates that the numerical simulation of this thesis is feasible.