Gate shaft is one of parts the power waterway system of dam structure and as an intake vertical tunnel or well function for hydroelectric power plants in Jatigede area, Sumedang, West Java. Paper concerns some consideration in determining a constitutive model of soil and rock material. Comparison of existing lateral movement and the analysis results identified that Hoek – Brown failure criterion were more suitable than Mohr – Coulomb. Study analysis was carried out using without and with reinforcement system, the risk assessment to a rock shaft during excavation is greater than that to a soil shaft, even though the two averages designed safety factors are the same. For the analysis, it should be considered to use the failure criteria of intermediate material.