STABILITY ANALYSIS OF JOINTED ROCK TUNNEL USING GEOSMA-3D MODELING

Analytical solution and simplified design procedure is presented for evaluating the response of existing joint rock tunnel. For joint rock, the stability of rock is controlled in a sense by the number of blocks, i.e. the size, orientation and locations of the discontinuities, especially the key blocks for a given excavation geometry. Key block failures occur where blocks of rock which are separated form the rest of the rock mass by discontinuities slide of fall into an excavation. In this research, according to block theory, the newly block stability analysis model is developed through GeoSMA-3D code. This model assumed that rock mass consists of blocks and each block is formed by particles arranged in a specific way, thus formulating a combination of block model and particle model. This code adopts vector analysis, which can simulate all excavation planes especially in the tunnel and other underground structure. It can also create three-dimensional structural model and analyze mobility of key block in the simulation plane by means of geometry and kinematics theory. The distribution of all key blocks and the quantitative data are analyzed by means of the newly developed program. It can be concluded that the newly code is a tool for modeling blocky rock masses.