Near-field vibration from blasting and rock damage prediction with a full-field solution

Gómez, Santiago Muñiz; Sanchidrián, José A.; Segarra, Pablo

doi:10.1016/j.ijrmms.2020.104357

Cited by 18 publications

(14 citation statements)

References 40 publications

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“…where r is the scaled distance, r � (r/r 0 ) and r is the distance from the measuring point to the charge centre; β is the attenuation index, β � 2 + (μ/1 − μ) for the shock wave and β � 2 − (μ/1 − μ) for the stress wave. [20] Full-field solution model of the near-field blasting vibration Q w � a 1 (1 − e − a 2 (R− r 0 ) ) + 0.5 [21] Superposition model of blasting vibration of cut blasting with cylindrical charge…”

Section: Equivalent Elastic Load Of Single-hole Cut Blastingmentioning

confidence: 99%

“…Eslami and Goshtasbi [19] put forward a loading model of blasting hole in the form of stress waves to simulate and analyze the explosion process by means of two types of software. Gómez et al [20] developed a full-field solution model of the near-field blasting vibration based on the linear viscoelastic theory. Liu and Chen [21] constructed the blasting vibration waves caused by cut blasting in tunnel excavation according to the waveform function derived from the point source theory.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Blasting Vibration Velocity of Layered Rock Mass under Multihole Cut Blasting

Zhu

Wei

Xiao-lin

et al. 2021

Shock and Vibration

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In the blasting construction of underground engineering in layered rock mass, the mechanism of cut blasting and the propagation law of blasting vibration waves are very complex. In this paper, a new method for predicting the blasting vibration velocity of layered rock mass under multihole cut blasting is proposed. The key steps include determining the equivalent elastic boundary and load, establishing the multidegree freedom model of blasting vibration and its motion differential equation, and solving the motion differential equation by time-history analysis method. Two multihole cut blasting tests of different schemes were carried out in the construction site of layered rock mass, and the measured results of blasting vibration waves were obtained. By comparing the time-history curves of the predicted and measured blasting vibration velocity, it can be seen that the time-history curves predicted by the proposed method can reflect the characteristics and attenuation law of blasting vibration waves, and the predicted waveforms are similar to the measured waveforms. By using the proposed method, the prediction accuracy for the peak velocity of blasting vibration in the two tests is 93% and 94%, respectively, and the prediction accuracy for the dominant frequency of blasting vibration in the two tests is 86% and 94%, respectively. The prediction accuracy of the main characteristic parameters of blasting vibration waves is high. So it can be proved that the prediction method proposed in this paper is feasible in effectiveness and accuracy, which can provide important theoretical guidance for the optimization of blasting design and the control of blasting vibration in underground engineering in layered rock mass.

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Section: Equivalent Elastic Load Of Single-hole Cut Blastingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Blasting Vibration Velocity of Layered Rock Mass under Multihole Cut Blasting

Zhu

Wei

Xiao-lin

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…The quarry mylonite mines are primarily intended for ballast and other construction aggregates. The blasts were located in the southwest part of the main pit at the deepest level.The mechanical properties of the rock have been taken from [8]. They are summarized in Table 1.…”

Section: Site and Testsmentioning

confidence: 99%

“…The full-field solution is a semi-analytical and physically sound vibration prediction model whose origin dates back to the mid-1980s and early 1990s [16,20]. It has had a certain impact in the last 15 years [3,4,5,8], but it is still far from having the same popularity as the well-known Holmberg-Persson model and its derivatives [11,12,13]. This is mainly due to the full-field solution calculation complexity, implementation difficulties, and longer calculation times.…”

Section: Introductionmentioning

confidence: 99%

Near-field frequency attenuation of vibrations from blasting using a full-field solution

2021

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This study analyses the frequency content of vibrations from blasting in the near field using a vibration prediction model called full-field solution (FFS). For that purpose, the frequency content of recorded signals and synthetic waveforms obtained through the FFS using dominant and mean frequencies have been compared and correlated with the geometrical distance to the blastholes. The study shows that the model overestimates the dominant and mean frequencies in the entire frequency domain, which may require tailoring the source function to a lower frequency content. However, it attenuates the frequency content as distance increases. Additionally, the study shows that the mean frequencies may be used as a better estimator of the frequency content than the dominant frequencies.

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“…Li et al used a cement mortar model to study the influence of spacing parameter on the crack penetration time between bench blasting holes and concluded that a large spacing parameter delays the crack penetration time and improves the energy utilization rate of the explosive and the blasting effect [10]. Research on loosening blasting under homogeneous rock mass conditions with large spacing parameter and the influence of joints and fissures on blasting has produced many results [11][12][13][14]. However, the study of large spacing parameters for loosening blasting is limited in the case of steps and large resistance lines.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Zhang

Wang

et al. 2021

Shock and Vibration

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In view of the near slope blasting in Barun open-pit mine, which has merged sublevel mining, the operation safety conditions of middle-sized and large equipment in the second phase expansion are poor and need urgent improvement. To increase the efficiency of expansion and reduce costs, a 24-m-high bench and large spacing parameter for loosening blasting are proposed. The analysis of the physical mechanism of the stress wave attenuation in the rock indicates that the cylindrical charge is equivalent to several spherical charges. Considering the pressure attenuation, reflection, transmission, and superposition of the spherical charge after the equivalence, a double exponential function correction equation of the stress wave attenuation is obtained based on the Mises strength criterion. The stress of any point in the rock medium with various spacing parameter is obtained by calculation. ANSYS/LS-DYNA was used to simulate and study the stress distribution of a 24-m-high bench with various spacing parameter. Meanwhile, the accuracy of the correction equation was verified. The parameters of the high-bench blasting with good effect and low cost were determined to be 15 m × 5.5 m, and field tests were carried out. Results show that the large spacing parameter for 24-m-high bench loosening blasting in Barun open-pit mine is efficient and economical in medium-hard rock blasting. This study provides a reference for the practical exploration of the expansion of high benches in open-pit mines in China. The calculation error of the corrected double exponential function is near the numerical simulation result. It is suitable for all kinds of professional designers.

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Near-field vibration from blasting and rock damage prediction with a full-field solution

Cited by 18 publications

References 40 publications

Prediction of Blasting Vibration Velocity of Layered Rock Mass under Multihole Cut Blasting

Prediction of Blasting Vibration Velocity of Layered Rock Mass under Multihole Cut Blasting

Near-field frequency attenuation of vibrations from blasting using a full-field solution

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

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