Query：
学者姓名：霍晓锋
Refining：
Year
Type
Indexed by
Source
Complex
Co-
Language
Clean All
Abstract ：
Evaluation of ground motion induced by underground blasting is a growing concern due to increased mining of large underground deposits. A numerical analysis is first conducted on the wave propagation characteristics, taking into account geological conditions and ground topography, and it is compared to that resulting from open-pit blasts. Then systemic experiments are conducted at two ore blocks in an underground mine. Predictions are made for peak particle velocity (PPV), frequency, and their combination for ground motions, which are then compared to inside rock vibrations induced by the same ore block blasts. Due to traditional inadequate prediction, the response spectral analysis and the normalized pseudo velocity response spectra (NPVRS) are employed to create a novel approach for illustrating ground motions. The results of numerical calculation and experimental analysis allow for the following conclusions: the wave propagation induced by underground blasting along the ground surface is more complex than that from open-pit blasts; the effect of charge weight on ground vibration decreases with a power factor (n) in the scaling attenuation equation lower than 1/3, as opposed to the typically acceptance of n being 1/2 for open-pit blasts and 1/3 for inside rock vibration induced by underground blasting; the frequency significantly drops from inside rock to ground surface; the NPVRS is a reasonable indicator for quantifying ground motions at specific positions with connecting structural responses, the relative displacement in the concerning frequency range of 5–20 Hz is linearly proportional to ground peak amplitudes. © The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2024.
Keyword ：
Ground vibration Ground vibration Inside rock vibration Inside rock vibration Normalized pseudo velocity response spectra (NPVRS) Normalized pseudo velocity response spectra (NPVRS) Prediction method Prediction method Underground blasting Underground blasting
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Gou, Y. , Shi, L. , Huo, X. et al. Propagation and Prediction of Blasting Vibration on Ground Surface Induced by Underground Mining with Comparison to Vibration Inside Rock [J]. | Rock Mechanics and Rock Engineering , 2024 . |
| MLA | Gou, Y. et al. "Propagation and Prediction of Blasting Vibration on Ground Surface Induced by Underground Mining with Comparison to Vibration Inside Rock" . | Rock Mechanics and Rock Engineering (2024) . |
| APA | Gou, Y. , Shi, L. , Huo, X. , Yu, Z. , Chen, Y. . Propagation and Prediction of Blasting Vibration on Ground Surface Induced by Underground Mining with Comparison to Vibration Inside Rock . | Rock Mechanics and Rock Engineering , 2024 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
During the numerical simulation of blasting in jointed rock masses, the accuracy of joint geometric parameters is one of the key factors affecting the numerical results. To facilitate the numerical simulation, most of the previous studies on blasting in jointed rock masses were conducted on regular jointed rocks, which is not conducive to fully revealing the dynamic responses and blast-induced damage characteristics of jointed rock mass. In this study, scanline sampling and borehole sampling were employed to obtain the surface and internal joint structures of the rock bench. To represent the joint geometry, a reconstruction technique for three-dimensional (3D) jointed rock masses in LS-DYNA was proposed utilizing MATLAB code. In the process, the elements on joint surfaces were identified and assigned mechanical parameters of joints to construct the 3D jointed rock model, where the geometrical properties of generated joints obey the statistical distribution obtained from the scanline survey. Taking an open-pit limestone mine as an example, a statistical analysis of the 3D distribution of joints was carried out and used to construct a 3D jointed rock numerical model for bench blasting. Comparisons between the bench slope extracted from the numerical model and the actual joint trace mapping from a rock exposure are performed, and the similarity between the two contour plots of joint orientations reaches 91.6 %. For comparison tests, the bench blasting was simulated by an intact rock model and the jointed rock model. The results indicate that the dynamic responses and blast-induced damage characteristics of jointed rocks are significantly affected by the geometry of joints. Compared with the intact rock model, the presence of joints causes stress concentration and local strengthening of rock damage between adjacent joints, which results in a 30.5 % increase in the damage volume. Furthermore, a field blasting test was conducted to analyze the accuracy of the jointed rock model. The results show that the fragment size distributions obtained from the jointed rock numerical model and the filed test are generally consistent, and the error between them in the proportion of rock fragments with a size of 0 ∼ 100 mm is only 12.8 %. These findings indicate that the proposed reconstruction method of the jointed rock model is considerably robust for characterizing the joint geometry of in situ rock masses and simulating the bench blasting in jointed rock masses. © 2024 Elsevier B.V.
Keyword ：
3D model reconstruction 3D model reconstruction Bench blasting simulation Bench blasting simulation Jointed rock mass Jointed rock mass LS-DYNA LS-DYNA Rock fragmentation Rock fragmentation
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Huo, X. , Jiang, Y. , Wei, W. et al. Three-dimensional finite element simulation and reconstruction of jointed rock masses for bench blasting [J]. | Simulation Modelling Practice and Theory , 2024 , 135 . |
| MLA | Huo, X. et al. "Three-dimensional finite element simulation and reconstruction of jointed rock masses for bench blasting" . | Simulation Modelling Practice and Theory 135 (2024) . |
| APA | Huo, X. , Jiang, Y. , Wei, W. , Qiu, X. , Yu, Z. , Nong, J. et al. Three-dimensional finite element simulation and reconstruction of jointed rock masses for bench blasting . | Simulation Modelling Practice and Theory , 2024 , 135 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Export
| Results： |
Selected to |
| Format： |
