Abstarct: Limitation of urban spaces, growing of population and urban development have been led to extensive use of tunnels as appropriate solution to overcome the above problems. Because of the soft and saturated ground in urban area, the control and estimate settlement of ground in tunneling is one of the most important challenges. The settlement caused by tunneling has always been influenced by several factors such as the ground type, tensor of stress, depth of excavation, groundwater level of the area, the method of excavation, etc. Each of them plays a major role in tunneling. Due to the importance of controlling and estimating the ground settlement in the tunneling of urban areas, in recent years this issue has been very much considered. In most studies, because of exsistence the complexity in comprehensive reviews, there are many simplifications such as neglecting changing of water level and couples phenomena, etc. in these studies that have very significant impact on the results. The complexity of the conditions is happen when the whole or part of the tunnel is excavated below the ground water level. In this situation, the design and estimates made from these simplifications cannot be precise. At the time of the tunnel excavation, the excavated space acts as a drainage channel. Water contained in the environment enters the excavated space, which causes a change in the hydraulic conditions of the area. This change in hydraulic conditions affects the mechanical properties of the environment and, as a result, it can increase the displacement around the tunnel. Given that the analytical solutions available from the hydromechanical interactions have limitations such as the application of physical and boundary conditions. With the advancement of computer technology and numerical methods, the process of solving the problems of hydromechanics towards numerical solution has changed. In this study, considering that 60% of the path of the Tehran metro line 7 is below the ground water level and the tunnel excavation path often passes through areas with urban decay. Controlling and estimating the settlement caused by excavation in the short and long term is of particular importance. Therefore, after selecting numerical software in accordance with the problem conditions, the three dimentional model of the case study tunnel is made in the FLAC3D software environment and after the conditions governing the environment, the deformation resulting from the excavation operation has been investigated. baxsed on the results, the amount of settlement created after excavation operations is 19 and 23 mm in couple and uncouple method. Comparison of the results with instrumentation data shows the high compliance of the couple method then the uncouple method. Also, the deformation around the excavation space is heavily dependent on the drainage and the groundwater level condition, so that the displacement and expansion of the plastic zone around the excavation space, in drained mode, is more than undrained. The long-term behavior of the tunnel in both drained and undrained mode shows that the deformation caused by drained does not change over time. See also, in the drained condition, the displacement increases around the excavation space with over time.