An experimental investigation of the fracturing behaviour of rock-like materials containing two V-sh

来源 :矿业科学技术学报(英文版) | 被引量 : 0次 | 上传用户:yzz133
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The distribution characteristics and evolution law of rock mass fissures induced by mining are a key sci-entific issue in the study of deep rock mechanics.In this study,a series of uniaxial compression experi-ments was conducted on rock-like specimens containing double V-shaped prefabricated fissures at dip angles of α = β = 45°,α = 45°<β = 60°,α = β = 60°,and α = 60°<β = 75° with a rock mechanics servo-controlled testing system.According to the experimental results,the effects of the dip angles of the dou-ble V-shaped prefabricated flaws with the same area on the mechanical parameters and fracturing pro-cess of the specimens were analysed in detail.Additionally,the crack initiation stress presented a nearly linear growth trend,which is generally similar to that of the crack peak stress with increasing flaw dip angle.By applying photographic monitoring to the crack initiation,propagation,coalescence,and failure modes in rock-like specimens,it was easily seen that the V-shaped flaw properties slightly influence the crack initiation positions but significantly influence the crack trajectories.The crack failure modes can be summarized into two distinct types.The study reported herein can provide a better understanding of the evolution of double V-shaped prefabricated fissures induced by coal mining.
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