NUMERICAL ANALYSIS OF PRESTRESSED ANCHOR LATTICE SYSTEM IN LANDSLIDE PROTECTION

Based on the large-scale physical model test, we established a landslide model protected by presressed anchor lattice with the finite difference software Flac3D,simulated the landslide from initial state to limit state and analyzed the mechanics properties during this process. The result indicated that anchor frame technique can restrict the slide of landslide effectively. Under load on the top platform of landslide, the stress of the slide changed, which was stronger at the beam and decreased to the surrounding gradually with the maximum stress at the bottom beam node. The anchor bore uneven axial force. The axial force of the free section was basically equal, while the axial force of anchorage section decreased gradually from the slide surface to the end. On the other hand, the axial force of anchors from top to bottom increases gradually. The intermediate of the beam suffered lateral tension while the node part suffered inner tension and the maximum shear force and bending moment occurred at the node. The forces of horizontal beam get stronger from top to bottom. The force of horizontal and vertical beams is different, so the internal force calculation of lattice beam should be considered respectively.