The Specific Length of an Underground Tunnel and the Effects of Rock Block Characteristics on the Inflow Rate

The specific length of a tunnel (STL) and new analytical model for calculating the block surface area rock mass are introduced. First, method determining appropriate numerical simulation is described. then used to examine correlation between inflow rate volume, area, fracture intensity (P32) through modeling. results indicate that should at least be equal common multiple (LCM) apparent spacings joint sets wall obtain more reliable immediate excavated in fractured mass. A was developed calculate determine essential set parameters, which include dip, dip direction, spacing. determination characteristics modeling requires considering intact calculations. indicated increased with an increase decrease volume area. STL validated simulations 3DEC software version 7.0.