Physical Modeling of Displacement and Failure Monitoring of Underground Roadway in Horizontal Strata

Physical modeling of the underground roadway in horizontal strata is carried out by using a newly developed physical modeling approach, the so-called “physically finite elemental slab assemblage (PFESA).” The numerical 2D digital image correlation (DIC) technology is used to carry out the real-time monitoring of the surface displacement of the model in the experimental process, and the axial force monitoring devices called the small bolt (SB) and small constant resistance bolt (SCRB) are designed for the real-time detection of the roadway mechanics data. The displacement information of the whole physical model experiment process is obtained through the DIC technology. The SCRB can be well used to the mechanical monitoring of the deformation and failure of the roadway, though the analysis of the displacement and mechanical monitoring data can get that the change of the mechanical monitoring data of SCRB in advance of the displacement, the information of instability destruction precursor in roadway surrounding rock is the continuous increase of mechanical monitoring value in a short time. The experiment provides reference for the stability monitoring and early warning of the roadway surrounding rock based on a constant resistance and large deformation rock bolt (CRLB).