Influence of anchor spacing on MSE wall stability

Abstract

This study investigates the impact of anchor spacing on the stability of Mechanically Stabilized Earth (MSE) walls using a novel configuration of crossbar necklaces and starter ails. The aim is to determine the optimal spacing for anchors to enhance stability while adhering to the SNI 8460-2017 geotechnical standards. The methodology integrates field tensile testing, laboratory experiments, and numerical modeling via PLAXIS 3D software to validate findings. The findings reveal that anchors with ctc spacings of 30 cm and 50 cm meet the design criteria, achieving deformation values of 44.71 mm and 20.10 mm, respectively, below the maximum permissible 70 mm. Additionally, safety factors for these spacings exceed the required threshold of 1.5. Conversely, anchors with a ctc spacing of 70 cm, while demonstrating acceptable deformation (20.22 mm), fail to meet safety requirements due to a factor of 1.481. Field tests corroborated the numerical results, showing tensile capacities of 86.9 kN and 35.2 kN for anchors with ctc spacings of 30 cm and 50 cm, respectively. The results emphasize the significance of optimal anchor spacing in maintaining MSE wall stability, particularly under challenging conditions like high rainfall and limited right-of-way.