Investigation of Anchor Load During the Construction of an Excavation in Hanoi

This study investigates the development of anchor load during the constrcution of an excavation in Hanoi. The adopted excavation was a case study, which was modelled using PLAXIS 3D. The final excavation depth was 10.3 m. Behavior of soil was simulated with the elastic-perfectly plastic Mohr-Coulomb model. Results showed that when the d/L ratio decreased (d is the distance between the examined point to the nearest excavation corner and L is the excavation length), the maximum wall deformation was firstly unchanged as d/L = 1/2–1/8 and then reduced as d/L = 1/8–0 due to the corner effect. For each of the anchor layers, at the excavation stage right after preloading, the anchor load would increase because the wall deformation at the anchor head increased. However, at the other proceeding excavation stages, the anchor load would reduced owing to the deep inward movement of the wall. For a given excavation stage, the variation of anchor load was compatible with that of the maximum wall deformation at the examined points. In particular, the anchor load was constant as d/L = 1/2–1/8 and reduced as d/L = 1/8–0.