Failure Mechanism of Bolts and Countermeasures in Swelling Soft Rock Support
| Autor: | Songyang Yin, Lei Zhang, Zhibiao Guo, Haohao Wang, Tao Li, Xiaohui Kuai |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
pretension bolt
0211 other engineering and technologies General Engineering Failure mechanism 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences constant resistance large deformation (CRLD) bolt failure mechanisms swelling soft rock lcsh:TA1-2040 medicine Geotechnical engineering Swelling medicine.symptom lcsh:Engineering (General). Civil engineering (General) Geology 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Tehnički vjesnik Volume 25 Issue 5 Tehnički Vjesnik, Vol 25, Iss 5, Pp 1447-1456 (2018) |
| ISSN: | 1848-6339 1330-3651 |
| Popis: | The effect of conventional bolt support is not ideal due to the large deformation character of soft rock. As an innovative bolt, constant resistance large deformation (CRLD) bolt has been successfully applied to swelling soft rock engineering, but the reinforcement mechanism is not yet clear. To investigate the interaction mechanism between bolt and surrounding rock, Nanshan Coal Mine of China was selected as the engineering background. The plastic zone of surrounding rock mass and the axial force of three bolts were obtained by theoretical analysis and FLAC3D numerical simulation. Failure processes of conventional pretension bolts in soft rock were reproduced, and the interaction between CRLD bolt and soft rock was investigated in comparison. The results indicate that: (1) The fracture zone of surrounding rock exceeds the anchorage range of the low pretension bolt, the bolt slides with surrounding rock and finally fails. (2) The fracture zone of surrounding rock does not exceed the anchorage range of the high pretension bolt. However, with the accumulation of deformation energy, stress concentration makes the bolt break. (3) CRLD bolt can effectively absorb the deformation energy released by soft rock and maintain constant support resistance. The conclusions obtained in this study provide significant references in the selection of bolts in soft rock engineering. |
| Databáze: | OpenAIRE |
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