Guangqing Yang, Yunfei Zhao, He Wang, Zhijie Wang, and Weichao Liu. Study on the Mutual Influence of Back-to-back Geogrid Reinforced Soil Wall by Finite Element Method. Dynamic Systems and Applications 29 (2020) No. 7, 2392 – 2407

https://doi.org/10.46719/dsa20202973

ABSTRACT.
Back-to-back geogrid reinforced soil walls (BBGRSW) are mostly used in embankments for bridge abutments and narrow space conditions. However, there are still few studies on BBGRSW all over the world. Based on the finite element method, this paper studies the mutual influence range and influence mode of BBGRSW with different widths and panel slope angles. The results show that when the spacing D between the reinforced areas on both sides of the BBGRSW is less than the wall height, it will affect the horizontal deformation of the wall. The distribution of the horizontal earth pressure at the end of the reinforcement in the wall is similar to the Rankine active earth pressure; the change in the slope angle of the left wall can affect the deformation and the distribution of the earth pressure on the right wall. There is an embedded action area between the reinforcements on both sides, which is the main reason for affecting the distribution of geogrid tensile force. Also, based on the slip line field theory of the non-associated flow rule, the article studies the position of the potential slip surface in the non-reinforced zone of the GRS wall, and the angle between the slip surface and the horizontal is about 45°+ψ/2. This research can provide a reference for the design optimization of back-to-back reinforced earth retaining wall.

Keywords: back-to-back geogrid reinforced soil wall; mutual influence; horizontal deformation; tension of reinforcement; influencing factors.