Abstract: This paper discusses the effect of different excavation sequence on the stability of the soilrock dual structure formations. Four different excavation sequences were studied in a deep excavation project in Jingde, Jiangxi Province. The onestep, sequential stepped, skipped excavation and sequential skipped excavation are numerical simulated and are performed in the construction and the slope surfaces at each type of excavation were monitored. The monitored data indicated that the excavation would result in the gravitational stress redistribution at the bottom of the excavation. The sequential skipped excavation method would be beneficial to the stability of the excavated area. Whereas, the stepped excavation method would reduce the heave at the excavated area. Analyses of different excavation methods can accurately simulate the excavation sequence on the stability of the excavated slopes and the excavation method can be optimized.

Key words: Deep Excavation, SoilRock Dual Structure Formations, Slope Stability, Numerical Analysis