Stress Analysis of Three-row Pile Rigid Frame Retaining Structure in High Slope with Deep and Thick Backfill Soil

The supporting structures of single row cantilever pile, pile-anchor support, double row pile, H-type pile and other supporting structures have deficiencies in high slope with deep and thick backfill soil. In view of the deficiencies, three-row pile rigid frame retaining structure was analyzed. In supporting deep fill high slope, the three-row pile rigid frame retaining structure can simultaneously play the role of "retracting slope" and "reinforce the foot of the slope". The application of this structure could save land and realize retaining effectively. Through engineering examples, displacement method and MIDAS GTX NX finite element software were used for calculation and analysis. The comparison results show that the simplified displacement method can be used to approximate the bending moment of three-row pile rigid frame retaining structure. The section rigidity of front pile and connecting beam should be strengthened in the design, and ensure that the nodes are rigidly connected. The grading height of rigid frame structure should be roughly uniform and the cantilever height of rear pile should be reduced as much as possible.