| The Combined reinforcement system (CRS) Combines the strengths of roof bolting, resin-anchored cable bolt, and chemical grouting to effectively control the deformation of the strata surrounding an extremely poor entry. It is easy to implement and fast in installation. It is one of the systems that are suitable for the reinforcement and maintenance of extremely poor entries.This thesis Introduce the measurement results of the strength and structures of surrounding rock based on the S520 level transportation entry of Changcun Coal mine,Luan Coal Bureau; Introducing the characteristic of pretensioned cable with small borehole anchored by resin and grout; The design method and scheme of reinforcement, underground construction technology and monitoring, The evaluation of the strengthening effect and techno-economic benefits.
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