Shallow tunneling within block-in-matrix rocks (Bimrocks) poses considerable geotechnical challenges due to their varied composition and unpredictable mechanical properties. This thesis explores the behavior of shallow tunnels situated in bimrocks, with a particular emphasis on how the Volumetric Block Proportion (VBP) influences tunnel stability and surface displacement. A detailed numerical analysis was performed utilizing RS2 modeling, which examined different VBP scenarios (25%, 40%, 55%) to evaluate deformation characteristics. The research incorporates stochastic modeling techniques to replicate the random distribution of rock blocks, thereby providing an accurate depiction of bimrock formations. The findings demonstrate that an increase in VBP contributes to enhanced tunnel stability by mitigating surface settlement and deformation, with a notable 62.16% reduction in vertical displacement as VBP escalates from 0% to 55%.