Abstract: This paper presents a case history of the design and construction of a Luoyang Zhoushan shallow buried large cross section tunnel in loess soil strata. A three dimensional numerical analysis model was established to simulate the soil deformation and the stress in the supporting structures during the tunnel excavation. The results indicate that, the magnitude of the horizontal movement in the soil mass is smaller than the vertical subsidence value. The majority of the soil movements occurred before the supporting structures are engaged. The deformations at the tunnel crest and the ground surface subsidence before the engaging of the supporting structures are 81.5% and 70.5%, respectively. The maximum stress in supporting structure is at the tunnel crest and the stress was rapidly stable after the engaging of the supporting structure. The vertical and horizontal deformation monitoring results are consistent with the predicted values.

Key words: Shallow Buried Large Cross Section Tunnel, Ground Movement, Numerical Analysis, Field Monitoring