Dynamic Response Law of Nonpersistent Jointed Rock Mass Under Normal Impact Load
Normal dynamic mechanical characteristics of the jointed rock mass are of great significance for studying the working state of rock mass with nonpersistent joint. In this paper, combined with the joint normal deformation theory, the rock-like materials with penetration along different normal directi...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/vib/8100588 |
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| Summary: | Normal dynamic mechanical characteristics of the jointed rock mass are of great significance for studying the working state of rock mass with nonpersistent joint. In this paper, combined with the joint normal deformation theory, the rock-like materials with penetration along different normal directions were analyzed under impact tests of different weights and heights. The experimental results show that under the same impact conditions, as the joint penetration length L increases from 0 to 100 mm, the peak load and joint stiffness of the rock mass joint specimen gradually decrease during the impact process, and the normal dynamic compression displacement and the normal closure of the rock mass joint gradually increase. The energy dissipation gradually decreases at the impact heights of 500, 1000, and 1500 mm. When the impact height is 2000 mm, the energy dissipation first increases and then decreases. Under the action of cyclic impact, the crack propagation path of jointed rock mass specimens is that the cracks originate at the loading place and develop to the joint surface and then spread to the weak joint end to form 90° wing cracks. The crack width, propagation scale, and damage degree gradually expand with the increase in joint penetration length L. |
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| ISSN: | 1875-9203 |