A one-dimensional axisymmetric explosive model and its application in bench blasting simulation

ZHU Xinguang; FENG Chun; WANG Xinquan; CHENG Pengda; GAO Shengyuan

doi:10.11883/bzycj-2021-0276

Volume 42 Issue 11

Nov. 2022

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ZHU Xinguang, FENG Chun, WANG Xinquan, CHENG Pengda, GAO Shengyuan. A one-dimensional axisymmetric explosive model and its application in bench blasting simulation[J]. Explosion And Shock Waves, 2022, 42(11): 115202. doi: 10.11883/bzycj-2021-0276

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ZHU Xinguang, FENG Chun, WANG Xinquan, CHENG Pengda, GAO Shengyuan. A one-dimensional axisymmetric explosive model and its application in bench blasting simulation[J]. Explosion And Shock Waves, 2022, 42(11): 115202. doi: 10.11883/bzycj-2021-0276

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A one-dimensional axisymmetric explosive model and its application in bench blasting simulation

doi: 10.11883/bzycj-2021-0276

ZHU Xinguang^{1, 2
,},
FENG Chun^{1
,
,},
WANG Xinquan^{1, 2},
CHENG Pengda¹,
GAO Shengyuan³

1.
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
2.
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
3.
China Coal Research Institute, Beijing 100013, China

Received Date: 2021-07-01
Rev Recd Date: 2022-07-20

Available Online: 2022-08-07

Publish Date: 2022-11-18

Abstract

Abstract

The bench blasting technology is widely applied in mining, transportation and civil construction excavations, in which numerical simulation plays an increasingly important role in the selection and optimization of parameters. In order to solve the problems of dense mesh and large amount of calculation in solid hole modelling, a one-dimensional axisymmetric explosive model is proposed. In this model, the rock mass to be exploded is divided into larger solid mesh elements, and the blast hole is simplified into a bar and inserted into the designated position of the rock mass to be exploded. The bar is divided into several elements, and the classic Landau model is introduced into the bar elements. The gas expansion pressure is calculated according to the volume of the bar element. By determining the topological relationships between bar nodes and solid elements, if the bar node is located in the interior (3D) or surface (2D) of a solid element, the solid element is used as the force transfer object of the bar node, and the explosive gas pressure on the bar node is applied to the solid element. At the same time, the constitutive model is applied for solid elements according to the specific material, so as to calculate the body strain of the solid element. The bar element only expands radially is assumed, so the cross-sectional change at the bar node can be calculated according to the strain of the solid element body, which is used to calculate the explosive gas pressure at the next moment. Through numerical comparison with the entity bore hole model, when the pressure attenuation index is 1.25, the radial peak particle velocity attenuation law and vibration velocity time history curve obtained by the one-dimensional axisymmetric explosion source model are basically consistent with the entity blast-hole model, which proves the accuracy of the model in blasting simulation. Aiming at the study of dynamic blasting damage characteristics of concrete blocks, the correctness of the model is further verified by comparing with the literature. Based on the blasting technology in Angang open-pit mine, a generalized three-dimensional bench blasting model with 5 rows and 50 bore holes was set up to simulate the damage and failure status in the blasting area. The numerical calculation results show that the tensile failure is the dominant in the blasting area, and the peak particle velocity and its variation with distance at monitor points except the first point near the blasting source is well fitted with the test data, which proves the feasibility of the proposed model in the far-field simulation of three-dimensional bench blasting.
- one-dimensional axisymmetric explosive model,
- bench blasting,
- continuous-discontinuous element method (CDEM),
- peak particle velocity,
- numerical simulation

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References(28)

References

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