Parameter study on constant bearing capacity of a novel energy-absorbing rock bolt based on metal plastic flow
A novel energy-absorbing rock bolt based on metal plastic flow was proposed to reduce deep mining rock mass deformation, with the advantages of a long elongation rate (50 %) and adjustable stable bearing capacity. The relationship between bolt bearing capacity and geometric and material properties c...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025026003 |
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| Summary: | A novel energy-absorbing rock bolt based on metal plastic flow was proposed to reduce deep mining rock mass deformation, with the advantages of a long elongation rate (50 %) and adjustable stable bearing capacity. The relationship between bolt bearing capacity and geometric and material properties can only be established through time-consuming and labor-intensive laboratory tests. Consequently, analytical and numerical modelling under the various conditions is a viable technical approach. In this work, a mechanical and mathematical model was developed for the sphere-rectangular contact mechanics of ball bearings with rebar and tube, and the analytical calculation method of bearing capacity was obtained. Subsequently, the numerical model of the bolt was established in the finite element method (FEM) to mimic the pull-out process, and the accuracy of the numerical model was validated using analytical and experimental results. The four parameters of the bolt's bearing capacity were quantitatively analyzed based on the distribution of contact stresses and load-displacement curves subjected to loading conditions. The results show that the material and geometric properties (i.e., diameter and number of steel balls, clearance) have obvious influence on the bearing capacity and support stability of the energy absorbing bolt. The bearing capacity of multiple balls can be predicted by calculating the capacity of a single ball. In addition, selecting the appropriate material and making reasonable adjustments to the geometric parameters, keeping the insert depth of each ball greater than 1 mm, can effectively improve the bearing capacity and support stability of the novel energy-absorbing bolt. |
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| ISSN: | 2590-1230 |