Study on model test of creep deformation and failure evolution in deep high-stress roadways
In response to the significant deformation and support difficulties of deep underground roadways caused by the strong time-dependent behavior of surrounding rock, based on the deep roadways of Wugou Coal Mine, a similar model test technology that can truly simulate the creep characteristics of rocks...
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| Main Author: | |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Safety in Coal Mines
2025-08-01
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| Series: | Meikuang Anquan |
| Subjects: | |
| Online Access: | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241683 |
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| Summary: | In response to the significant deformation and support difficulties of deep underground roadways caused by the strong time-dependent behavior of surrounding rock, based on the deep roadways of Wugou Coal Mine, a similar model test technology that can truly simulate the creep characteristics of rocks was designed and a large-scale physical model test was conducted. During the test, the loading stress was first set to simulate the real stress environment of deep roadways, and then a step-by-step excavation, timely support, and stepwise stress increment simulation method was adopted to conduct the creep deformation test. The results show that under creep conditions, the vertical convergence of the roadway is approximately 2.34 times that of the horizontal convergence, and the net size of the roadway ultimately decreases by 47.7%; the failure process of the roadway shows significant phased characteristics, and the roadway first experiences floor heave, which further induces the deformation of the sidewall, subsequently, the continuous convergence of the sidewall causes the support structure to be compressed and bulge, leading to the gradual subsidence of the roof and ultimately resulting in the convergence of the entire cross-section of the roadway; the radial damage characteristics of the surrounding rock are significantly stronger than the tangential ones, and the damaged zone is concentrated within 0-100 mm from the surface of the roadway, with the floor area being the most severely damaged, having a radial integrity reduction coefficient (IRF) as high as 62.8%, and the IRF of the sidewall exceeding 30%, indicating that the support in this area is particularly crucial; the strain of the surrounding rock shows a pattern of gradually extending from the surface to the deep. The maximum radial strain increment in the roof area is approximately 5 300 ×10−6; The stress state of the surrounding rock undergoes a transition from compression to tension, micro-element analysis reveals that the specific evolution sequence of roadway failure is “floor heave induces deformation of the roadway sidewall → convergence of the roadway sidewall causes bulging of the side wall → bulging of the side wall leads to roof subsidence → convergence of the entire cross-section of the roadway”. |
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| ISSN: | 1003-496X |