The main difficulty in the development of underground space is the problem of anchorage support at the top and the periphery of the space. This is related to the quality of a project and has a great influence on the duration of the project. Rock bolts are the latest type of widely used anchoring support tools. Rock bolting, in tunneling and underground mining, steel rod inserted in a hole drilled into the roof or walls of a rock formation to provide support to the roof or sides of the cavity. Rock bolt reinforcement can be used in any excavation geometry, is simple and quick to apply, and is relatively inexpensive. The installation can be fully mechanized. The length of the bolts and their spacing can be varied, depending on the reinforcement requirements. The cement slurry injected through the hollow bolt fills the entire borehole, and then penetrates into the fractures of the rock layer, and the anchoring effect is improved much more than the conventional anchorage method. Rock bolt is easy to install, simple to operate, save raw materials and manpower, has good anchorage effect, and has great social and economic benefits, so it is accepted by many construction parties.
