In addition, square and circular tunnels are discussed in the paper to obtain the optimal upper bound solution by giving relevant parameters. Notice that the overall scopes of falling blocks on the whole in partly weathered stratiform rock banks are much larger than that in homogeneous layer, which manifests that the results derived from existing failure mechanisms are not accurate enough to guarantee the safety of tunnel construction in non-homogeneous strata, and therefore special attention should be paid in laminar geomaterials. In the analysis of parametric study, investigating the change law of parameters is of great significance to instruct the actual projects from the perspective of engineering. In brief, the approach utilized in this literature can be a sound alternative to evaluate the roof stability in partly weathered stratiform rock masses.