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| Study on prestressed anchorage strengthening effect of jointed rock mass under uniaxial compression |
| Hu Jiaqi, Zhang Shun, Huang Zhengwen, Li Huiyuan |
| School of Mining and Geomatics, Hebei University of Engineering, Handan 056038, China |
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Abstract In order to study the influence of prestressed anchor on the mechanical properties and fracture morphology of jointed sandstone, the mechanical properties and fracture characteristics of anchored jointed sandstone were analyzed by uniaxial compression test. The results show that the post-peak stress-strain curve of anchored jointed rock mass shows a slow downward trend, and the bearing capacity is significantly improved. The anchoring position has a significant effect on the improvement of strength and elastic modulus. The strength gain ratio and elastic modulus gain ratio under LC-2 condition reach the maximum values (0.134 and 0.248), and the anchoring effect is the best. The crack propagation analysis shows that the crack propagation of the anchored rock is stagnant and does not develop to the end of the specimen, and the bolt has the strongest inhibition effect on the crack under the LC-2 working condition. The research reveals the influence of bolt position on the mechanical properties and fracture morphology of jointed rock mass, which provides a theoretical basis for the stability control and support optimization of surrounding rock in coal mine roadway.
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