ABSTRACT
Faults are complex zones composed of linked fault segments, one or more high strain slip surfaces nested within regions of high and low strains, Riedel shears, splay faults, dilatational and constructional jogs, and relay ramps (D.R. Faulkner et al. 2010). Fault zones control a wide range of crustal processes, which have a controlling influence on the crust’s mechanical property (Zoe.K. Shipton. 2010). Engineering geological conditions in underground mines are complex, which usually have fault zones at different scales (Xun Xi et al. 2015). To exploit a valuable ore more effectively and economically, mining engineers have to design some roadways under faults. When tunnels are arranged under the fault and the distance between the fault and the tunnel is short, the fault plays an important role in controlling the displacement of tunnels. Therefore, it is necessary to analyze the impact of faults on underground roadways in different scales. Some scholars have tried to analyze the stability of tunnels in fault zones by performing physical and
The numerical simulation model was 60 m in height, 50 m in width and 50 m in length (Figure 2). It was divided into 124,299 zones and 23,296 grid points. The shape of the tunnel was a three-centered arch. The faults with different thicknesses were achieved by changing the mechanical parameters of zones in different locations. The parameters of the fault and the rock are described in Table 1. The stress condition in these models was set up as SXX = 30 MPa, SYY = 25 MPa, and SZZ = 20 MPa.
