제안 방법

• 3, (a)). Furthermore, this study compared displacement vectors with another numerical analysis result which applied minimum input value among literatures, empirical equations, and field test results. Fig.
• In order to evaluate the rock classification systems and ubiquitous joint model(Ub model), this study performed case study whose cut-slope are adjacent to tunnel under construction. 00 tunnel is surrounded by mountains, and valleys have been developed.
• It is attributable to the point that ubiquitous joint model makes up for overestimated cohesion value derived by the GSI system which is one of techniques of reduction, and inserting schistosity as a main discontinuous plane induces similar stress pattern with real field situation. Method mixing GSI system with ubiquitous joint model drew the most reliable displacement and vector pattern, therefore numerical analysis based on the GSI system + ubiquitous joint model proposed by this study would be utilized effectively to design and check stability of joint rock slope/shallow depth tunnel.
• This study performed numerical analysis using the FLAC program to check the displacements and their pattern of tunnel portal area including cut-slope. In case of 00 tunnel, steel pipe supports of one row were reinforced after excavation, and deformation of shortcrete and cracks were observed at sidewall of tunnel portal.
• Especially when excavating shallow depth tunnel, uneven pressure could be applied along with direction of slope and consequently it affects to stability of tunnel portal and adjacent cut-slope. This study tries to analyze whether or not the uneven pressure is critical to overall collapse by introducing rock mass classification methods and ubiquitous joint model.
• However, most geotechnical programs are based on the elasto-plastic Mohr-Coulomb model, which accomplishes continuum model analysis in spite of jointed rock mass condition. To apply jointed rock mass into continuum model analysis, reduction of rock mass strength is required, and this study tried to apply rock mass properties derived by the GSI systems into numerical analysis. In addition, the ubiquitous joint model was introduced to jointed rock mass properties derived by the GSI systems for more elaborate simulation of field situation.