Deformation Behavior of Excavated High Loess Slope Reinforced with Soil Nails and Pre-reinforced-Stabilizing Piles

Abstract

For the research of the deformation behavior of excavated high loess slope reinforced with the combination system of soil nails and pre-reinforced-stabilizing piles. An open cut slope is chosen as an example for field monitoring with the following results obtained: (1) As the excavation depth increasing, the pre-reinforced-stabilizing piles all moved toward outside due to the existence of earth pressure behind piles. (2) As the increase of excavated depth, the value of earth pressure before piles presents a nonlinear variation with one maximum point appeared along depth. Differing from that before piles, the fluctuation of the earth pressure behind piles obviously increased with both maxima points distributed along depth. (3) Similar to the display of earth pressure, the distribution of the reinforcement stress along piles also fluctuated as the increase of excavation. (4) The axial nail load presents an obvious increase during excavation, which indicates that the layout of soil nails played an effective role for the stabilization of excavated slope. (5) Based on the distribution of axial nail load during excavation, it is inferred that the potential sliding surface of slope soil above piles displays in an arc-shape with its toe of slip surface located at the top of pile.