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Geomechanics and Engineering Volume 20, Number 5, March10 2020 , pages 461-474 DOI: https://doi.org/10.12989/gae.2020.20.5.461 |
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Incompatible deformation and damage evolution of mixed strata specimens containing a circular hole |
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Shuo Yang, Yuanhai Li, Miao Chen and Jinshan Liu
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| Abstract | ||
| Analysing the incompatible deformation and damage evolution around the tunnels in mixed strata is significant for evaluating the tunnel stability, as well as the interaction between the support system and the surrounding rock mass. To investigate this issue, confined compression tests were conducted on upper-soft and lower-hard strata specimens containing a circular hole using a rock testing system, the physical mechanical properties were then investigated. Then, the incompatible deformation and failure modes of the specimens were analysed based on the digital speckle correlation method (DSCM) and Acoustic Emission (AE) data. Finally, numerical simulations were conducted to explore the damage evolution of the mixed strata. The results indicate that at low inclination angles, the deformation and v-shaped notches inside the hole are controlled by the structure plane. Progressive spalling failure occurs at the sidewalls along the structure plane in soft rock. But the transmission of the loading force between the soft rock and hard rock are different in local. At high inclination angles, v-shaped notches are approximately perpendicular to the structure plane, and the soft and hard rock bear common loads. Incompatible deformation between the soft rock and hard rock controls the failure process. At inclination angles of 0 | ||
| Key Words | ||
| circular hole; mixed strata; incompatible deformation; damage evolution; failure mode | ||
| Address | ||
| Shuo Yang: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China Miao Chen: State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China Yuanhai Li and Jinshan Liu: 1.) State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China 2.) School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China | ||