Shear-induced rockburst of double-tunnel rocks subjected to shear loading: A comparative analysis

Abstract

Understanding triggering mechanism of shear-induced rockburst is of great significance for design, construction and operation in underground engineering. To reveal triggering rockburst mechanism in double-tunnel rocks (DTR), double rectangular tunnel (DRT) and double circle tunnel (DCT) physical model shear tests are executed, combined with high-speed cameras and acoustic emission monitor. And five tunnel spacing numerical models are established to investigate the triggering rockburst meso-mechanism based on continuous-discontinuous shear process. In addition, a energy impact index (S) is presented to evaluate shear-induced rockburst proneness. The test results indicate that the shear characteristic, internal and external failure characteristics, and micro-crack number evolution characteristics of DTR can generally be divided into four unified typical stages. In terms of fracture evolution, the shear failure of DTR has experienced shear compression stage, elastic stage dominated by crack initiation, shear fracture stage dominated by crack propagation-coalescence and shear-induced rockburst, and shear friction stage. It is generalized into typical shear model, and it reveals that DTR exhibits a significant characteristic of symmetrical cat-ear shaped notch formed after the shear-induced rockburst. In the aspect of the evolution of micro-cracks, the specimen has crack quiet period, initial crack increase stage, rapid crack increase stage, and crack stability stage. In addition, when the tunnel spacing is greater than 2 times tunnel diameter, the stress concentration phenomenon is significantly optimized. More importantly, the essential triggering shear-induced rockburst mechanism difference between DRT and DCT is the structural effect caused by the section shape, i.e., the difference in stress field distribution between DRT and DCT leads to different rockburst behaviors. The research results are beneficial for deepening the understanding on mechanism of shear-induced rockburst.

Keywords

shear-induced rockburst / physical model / double-tunnel rocks / discrete element method / tunnel spacing / stress field

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