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A platform for research: civil engineering, architecture and urbanism
The influence of the disturbing effect of roadways through faults on the faults' stability and slip characteristics
AbstractIn order to mitigate the risk of geological disasters induced by fault activation when roadways intersect reverse faults in coal mining, this paper uses a combination of mechanical models with PFC2D software. A mechanical model is introduced to represent various fault angles, followed by a series of PFC2D loading and unloading tests to validate the model and investigate fault instability and crack propagation under different excavation rates and angles. The results show that (1) the theoretical fault model, impacted by roadway advancing, shows a linear reduction in horizontal stress at a rate of −2.01 MPa/m, while vertical stress increases linearly at 4.02 MPa/m. (2) At field excavation speeds of 2.4, 4.8, 7.2, and 9.6 m/day, the vertical loading rates for the model are 2.23, 4.47, 6.70, and 8.93 Pa/s, respectively. (3) Roadway advancement primarily causes tensile‐compressive failures in front of the roadway, with a decrease in tensile cracks as the stress rate increases. (4) An increase in the fault angle leads to denser cracking on the fault plane, with negligible cracking near the fault itself. The dominant crack orientation is approximately 90°, aligned with the vertical stress.
Highlights The mechanical model of fault activation induced by roadway excavation was established with the plane strain theory. The loading rate relationship between the numerical simulation model and field scale was developed. The influence of fault angles and roadway excavation speed on the fault instability was investigated.
The influence of the disturbing effect of roadways through faults on the faults' stability and slip characteristics
AbstractIn order to mitigate the risk of geological disasters induced by fault activation when roadways intersect reverse faults in coal mining, this paper uses a combination of mechanical models with PFC2D software. A mechanical model is introduced to represent various fault angles, followed by a series of PFC2D loading and unloading tests to validate the model and investigate fault instability and crack propagation under different excavation rates and angles. The results show that (1) the theoretical fault model, impacted by roadway advancing, shows a linear reduction in horizontal stress at a rate of −2.01 MPa/m, while vertical stress increases linearly at 4.02 MPa/m. (2) At field excavation speeds of 2.4, 4.8, 7.2, and 9.6 m/day, the vertical loading rates for the model are 2.23, 4.47, 6.70, and 8.93 Pa/s, respectively. (3) Roadway advancement primarily causes tensile‐compressive failures in front of the roadway, with a decrease in tensile cracks as the stress rate increases. (4) An increase in the fault angle leads to denser cracking on the fault plane, with negligible cracking near the fault itself. The dominant crack orientation is approximately 90°, aligned with the vertical stress.
Highlights The mechanical model of fault activation induced by roadway excavation was established with the plane strain theory. The loading rate relationship between the numerical simulation model and field scale was developed. The influence of fault angles and roadway excavation speed on the fault instability was investigated.
The influence of the disturbing effect of roadways through faults on the faults' stability and slip characteristics
Deep Underground Science and Engineering
Lu, Shuaifeng (author) / Chan, Andrew (author) / Wang, Xiaolin (author) / Wang, Shanyong (author) / Wan, Zhijun (author) / Cheng, Jingyi (author)
Deep Underground Science and Engineering ; 3 ; 399-412
2024-12-01
Article (Journal)
Electronic Resource
English
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