The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways
Secondary pre-tightening of clamping cable joints can effectively improve the load-bearing performance of U-shaped steel supports. However, the underlying mechanism of secondary pre-tightening has remained a critical knowledge gap in ground control engineering, and its design still relies on empiric...
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MDPI AG
2025-03-01
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| author | Yubing Huang Hongdi Tian Xuepeng Wang Yucheng Wang Huayu Yang |
| author_facet | Yubing Huang Hongdi Tian Xuepeng Wang Yucheng Wang Huayu Yang |
| author_sort | Yubing Huang |
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| description | Secondary pre-tightening of clamping cable joints can effectively improve the load-bearing performance of U-shaped steel supports. However, the underlying mechanism of secondary pre-tightening has remained a critical knowledge gap in ground control engineering, and its design still relies on empirical approaches without theoretical guidance. To address these challenges, this study proposes a novel mechanistic framework integrating mathematical modelling, experimental validation, and parametric analysis. Specifically, a first-principle-based mathematical expression for the slip resistance of clamping cable joints under secondary pre-tightening was derived, explicitly incorporating the effects of bolt torque and interfacial friction; and a dual-phase experimental protocol combining axial compression tests and numerical simulations was developed to systematically quantify the impacts of initial pre-tightening torque, secondary pre-tightening torque (T<sub>2</sub>), and the timing of secondary pre-tightening (u/u<sub>max</sub>). Three groundbreaking thresholds were identified, as follows: critical initial pre-tightening torque (T<sub>1</sub> > 250 N·m) beyond which secondary pre-tightening becomes ineffective (<5% improvement); minimum effective secondary pre-tightening torque (T<sub>2</sub>/T<sub>1</sub> > 1) for significant load-bearing enhancement; and the optimal activation window (u/u<sub>max</sub> < 50%) balancing capacity gain (<10%) and deformation control. These findings establish the first quantitative design criteria for secondary pre-tightening applications, transitioning from empirical practice to mechanics-driven optimization. |
| format | Article |
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| issn | 2076-3417 |
| language | English |
| publishDate | 2025-03-01 |
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| spelling | doaj-art-a123cf1dffaf4c91a199da8ddb60db022025-08-20T02:09:18ZengMDPI AGApplied Sciences2076-34172025-03-01157380310.3390/app15073803The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock RoadwaysYubing Huang0Hongdi Tian1Xuepeng Wang2Yucheng Wang3Huayu Yang4School of Mechanics and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSecondary pre-tightening of clamping cable joints can effectively improve the load-bearing performance of U-shaped steel supports. However, the underlying mechanism of secondary pre-tightening has remained a critical knowledge gap in ground control engineering, and its design still relies on empirical approaches without theoretical guidance. To address these challenges, this study proposes a novel mechanistic framework integrating mathematical modelling, experimental validation, and parametric analysis. Specifically, a first-principle-based mathematical expression for the slip resistance of clamping cable joints under secondary pre-tightening was derived, explicitly incorporating the effects of bolt torque and interfacial friction; and a dual-phase experimental protocol combining axial compression tests and numerical simulations was developed to systematically quantify the impacts of initial pre-tightening torque, secondary pre-tightening torque (T<sub>2</sub>), and the timing of secondary pre-tightening (u/u<sub>max</sub>). Three groundbreaking thresholds were identified, as follows: critical initial pre-tightening torque (T<sub>1</sub> > 250 N·m) beyond which secondary pre-tightening becomes ineffective (<5% improvement); minimum effective secondary pre-tightening torque (T<sub>2</sub>/T<sub>1</sub> > 1) for significant load-bearing enhancement; and the optimal activation window (u/u<sub>max</sub> < 50%) balancing capacity gain (<10%) and deformation control. These findings establish the first quantitative design criteria for secondary pre-tightening applications, transitioning from empirical practice to mechanics-driven optimization.https://www.mdpi.com/2076-3417/15/7/3803secondary pre-tighteningclamping cable nodesdeep soft rockyielding U-shaped steel support |
| spellingShingle | Yubing Huang Hongdi Tian Xuepeng Wang Yucheng Wang Huayu Yang The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways Applied Sciences secondary pre-tightening clamping cable nodes deep soft rock yielding U-shaped steel support |
| title | The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways |
| title_full | The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways |
| title_fullStr | The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways |
| title_full_unstemmed | The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways |
| title_short | The Effects of Secondary Pre-Tightening of the Clamping Cable Nodes on Yielding U-Shaped Steel Supports for Use in Deep Soft Rock Roadways |
| title_sort | effects of secondary pre tightening of the clamping cable nodes on yielding u shaped steel supports for use in deep soft rock roadways |
| topic | secondary pre-tightening clamping cable nodes deep soft rock yielding U-shaped steel support |
| url | https://www.mdpi.com/2076-3417/15/7/3803 |
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