Abstract: The stability of the large cross sectional underground space during the construction is one of the important topics in underground engineering. The excavation method as well as the sequence of the main plant of an underground power house is numerically simulated twodimensionally by using ADINA software.  In the numerical simulation, the effect of the rock anchored was simulated by an equivalent shotcrete modulus. The stress, displacement and the yield zone are evaluated based on the specific site conditions. The analytical results are found to be consistent with the actual construction monitoring data.

Key words:  Excavation Process, ADINA software, Rock Anchors, Elastic Modulus, Stress Fields, Displacement Fields, Construction Monitoring