ABSTRACT
To solve the problems such as large rock deformation around the roadway and long deformation time during the support of the −650 m horizontal trackage roadway of Yangcheng mine, the research methods of field geological survey combined with theoretical calculation and field monitoring were used to analyze the deformation characteristics of surrounding rock and to investigate causes of roadway instability and failure. On this basis, a high-strength composite supporting scheme based on Concrete-filled Steel Tubular Support was proposed according to the strengthening support theory of pressure rings in deep-mine roadways. The bracket section was designed as an arc wall semicircle arch, and the main steel tube was Φ194 mm×8 mm seamless steel tube, filled with the C40 strength class concrete and enforced with shotcrete and rock bolt supporting and grouting reinforcement in surrounding rock. The research results showed that this supporting system could provide more than 1.57 MPa supporting reaction force to the surrounding rock, which could effectively inhibit the moving of surrounding rock into the roadway space. Besides, the accumulative deformation of the surrounding rock of the roadway was found to be less than 100 mm after the supporting was stabilized, satisfying the roadway deformation requirements.
