Study on Mechanical Characteristics and Failure Mechanism of Anchored Grouted Solids
The problem of high stress and multi-disturbance in coal mining is becoming more and more prominent,which leads to the need of anchored grouting support for roadways due to different degrees of breakage.In order to explore the bearing characteristics and failure mechanism of anchored grouting body,anchorless and anchored grouted solids with different particle sizes were made,and their failure characteristics,stress-strain curves and acoustic emission signal characteristics were analyzed respectively.The results show that the failure characteristics of grouted solids after anchoring change from tensile fracture failure to overall and regional spalling failure,and the failure characteristics of anchored grouted solids with different particle sizes are different.The reinforcement of the anchor rods to the grouted solids is mainly reflected in the post-peak,which increases the ductility and residual strength of the grouted solids.The acoustic emission characteristics characterize the fracture process of the anchored grouted solids,and the stage characteristics are obvious.With the increase of the particle size,the span of the acoustic emission active period increases,indicating that the fracture process of the specimen is slower and the gradual release of energy is more obvious.The research results provide a reference for the support design of surrounding rock with different crushing conditions in a coal mine in Shanxi.
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维普
