Abstract
The purpose of this study is to obtain the failure mechanism of shotcrete on fractured rocks. Firstly, the failure accidents of shotcrete were surveyed. These results implied the failure process; (1) Occurrence of un-bond tensile between shotcrete and bedrock by loading of fractured rocks, (2) Shotcrete including the bond fracture became a beam structure, (3) Flexural failure of beam shotcrete happened by loading of bedrocks. The tensile bond strength test and collapse-simulated test were carried out in order to verify these failure mechanics. From these tests results, reinforced shotcrete by using net or fiber was effective to prevent brittle fracture of shotcrete.
