Abstarct: In order to access the deposit in the case of great depth, due to the uneconomical nature of open pit mining, trends have moved towards the design of underground mines. Opening tunnels, also known as main tunnels, are needed to access minerals where underground mining is more economical. These main tunnels are actually the arteries of a mine. In case of instability in any part of these tunnels, it will stop the mining work, put people's lives in danger and ultimately make mining uneconomical. The intersection of these main tunnels is not exempt from this. It can be said that analysis of stability, preservation and maintenance of this section of tunnels is very important. There are many methods for stability analysis and maintenance design of underground tunnel intersections, the most important of which are experimental and numerical methods. The purpose of this research is to design the maintenance system of the intersection of two mining tunnels using experimental and numerical methods. The study case of this research is the w3 intersection in the number one coal mine of Parvade Tabas. In this thesis, firstly, the design of the W3 intersection maintenance system has been done using Q and RMR experimental methods. Then, the proposed maintenance of each of these methods has been compared with the current maintenance system installed at W3 intersection. The obtained results indicate that among the proposed Q and RMR systems, the proposed RMR system is closer to the current maintenance installed in the intersection. Next, the current maintenance system installed was simulated with FLAC 3D software. In order to validate, the created displacements were compared with the displacements that were removed from the precision instrument. The results indicate the consistency of the differences created in the model and the observations of precision instruments. Finally, using the built model, the effect of induced stresses on the stability of the intersection has been investigated.