Numerical Simulation of Stress Arching Effect in Horizontally Layered Jointed Rock Mass

Stress arching effect during the excavation of broken surrounding rock in underground engineering has an important influence on stability after excavation. To determine stress horizontally layered jointed mass, characteristics mass is analyzed this study by using a series numerical tests. The formation mechanism arch revealed through comparison voussoir beam structure and theoretical analysis multi-block mechanical relationship mass. method for determining boundaries zone proposed, various factors further discussed. Results show that bunch (SAB) formed lower strata above cavern, global (GSA) higher strata, both which are symmetrical patterns. SAB manifestation several low-level sandstone layers, GSA caused uneven displacement between blocks. Compared with GSA, more sensitive to influencing factors. extent decreases increase internal friction angle joint, lateral pressure coefficient, overburden depth. In addition, joint spacing conducive development arch. can provide technical support deformation control engineering.