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| Numerical simulation and industrial test on support parameters optimization of expansive rock roadway in a mine |
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Received:July 04, 2022
Revised:July 14, 2022
Accepted:July 28, 2022
Published Online:April 21, 2023
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| DOI： |
| KeyWord:Swelling rock roadway; 3D-σ; Support parameter optimization; Convergence deformation monitoring |
| Author | Institution |
| SHI Lei |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| HOU Kepeng |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| SUN Huafen |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| SUN Zhenguo |
School of Land and Resources Engineering,Kunming University of Since and Technology |
| MA Shengjie |
School of Land and Resources Engineering,Kunming University of Since and Technology |
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| Abstract: |
| In the past, the support scheme of soft rock roadway is only optimized by numerical simulation, and it is not combined with field industrial test, which cannot effectively guide the production practice of mines. Therefore, in order to solve the engineering disasters caused by expansive granite in the trackless transportation roadway of a mine in Yunnan, the expansion grade of the expansive rock roadway, the loose circle of the surrounding rock and the original support effect of the mine are determined by microscopic test, ultrasonic wave velocity test and bolt pull-out force test. The 3D-σ finite element simulation software is used to simulate and analyze the nine bolt parameters. The results show that the granite in the mine is a strong expansive soft rock, and the loose circle is between 1.6m and 1.8m, and the original support cannot meet the engineering practice. The bolt length of 2.1m, spacing of 0.9m and row spacing of 1.2m are the best when the shotcrete-anchor net combined support is used, and the field industrial test is carried out in the roadway according to its support scheme. It is found that the deformation of the roadway tends to be stable around February of construction, which has theoretical and practical significance for the support scheme provided by the mine. |
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