Because direct measurement of in situ stresses was not carried out, the values for vertical and horizontal stresses in the finite element models were estimated. A gravity type of field stress was applied as the tunnel location was considered relatively shallow. Download geotechnical engineering software RS2 11.0 developed by Rocscience. The rock layers were assumed to have plastic behavior, while the support systems were assumed to have elastic behavior. stress analysis program for underground or surface excavations in rock or soil. Forepolling reinforcement was modeled as a composite material following a method proposed by Hoek (2000).

Wahana Mitra Amerta (2014) are shown in Table 2. Applicable for both rock and soil (RS2 Rock and Soil 2-dimensional analysis program), RS2 is a general purpose finite element analysis program for tunnel and support design, underground excavations, surface excavation, slope stability, embankments, dynamic analysis, foundations, consolidation, groundwater seepage and more. Properties of the support systems provided by KSO PT. RS2 is a 2D finite element program for soil and rock applications that can be used on engineering projects and includes excavation, design, slope, stability and. The shear strength parameters (cohesion and friction angle) were obtained from laboratory triaxial consolidated-undrained (CU) tests. Properties of the tuff breccia layers are shown in Table 1. Stages of tunnel excavations in the numerical analyses followed those in the field.

The bottom was set at a distance of 5 times the tunnel radius and restrained in x and y directions, while the top was set at the actual ground surface elevation and unrestrained. The sides of the outer boundary conditions were set at a distance of 10 times the tunnel radius and allowed to shift vertically.

Distance between the twin tunnels was taken from the midpoint of each tunnel. This commitment to a better user experience is evident in the significant additions and improvements we’ve made to the UI in RS2 2019 to promote ease of modeling. But we also commit ourselves to building tools that are intuitive and easy to use. Simplified geometry of the finite element models is shown in Figure 3. Rocscience prides itself on building tools that engineers can rely on every day. Simplified geometry of finite element model.

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