PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves

The open-pit mining slopes continue to become higher and steeper with the continuous exploitation of near-surface mineral resources. The blasting excavation exerts a significance influence on the slope stability. In fact, intact rock slopes do not exist and slope stability is controlled by the geolo...

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Main Authors: Shiwei Lu, Chuanbo Zhou, Zhen Zhang, Ling Ji, Nan Jiang
Format: Article
Language:English
Published: Wiley 2020-01-01
Series:Shock and Vibration
Online Access:http://dx.doi.org/10.1155/2020/8865981
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author Shiwei Lu
Chuanbo Zhou
Zhen Zhang
Ling Ji
Nan Jiang
author_facet Shiwei Lu
Chuanbo Zhou
Zhen Zhang
Ling Ji
Nan Jiang
author_sort Shiwei Lu
collection DOAJ
description The open-pit mining slopes continue to become higher and steeper with the continuous exploitation of near-surface mineral resources. The blasting excavation exerts a significance influence on the slope stability. In fact, intact rock slopes do not exist and slope stability is controlled by the geological defects. In this paper, the stability of a rock slope imbedded with a fault is considered. The P-wave component of blasting seismic waves is focused on and the fault is simplified as a semi-infinite crack. In background of Daye iron mine, the peak particle velocity (PPV) threshold is determined based on the linear elastic fracture dynamics. The influence of frequency, Young's modulus, and Poisson's ratio is studied to modify the PPV threshold. Results show that (1) the PPV threshold decreases with the increasing Young's modulus and Poisson's ratio, but increases with the increasing frequency; (2) the initiation angle is immune to Young's modulus and the frequency, and only depends on the Poisson's ratio; (3) the PPV criterion is finally determined as 1.47 cm/s when the frequency f ≤ 10 Hz, 1.47 cm/s–3.30 cm/s when 10 Hz < f ≤ 50 Hz and 3.37 cm/s–6.59 cm/s when f > 50 Hz, which are far less than that of intact rock slopes; (4) The north slope is quite safe if the proposed PPV threshold is not violated due to the variation range of the initiation angle θ0.
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issn 1070-9622
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series Shock and Vibration
spelling doaj-art-83c2916f26034b04918060c90db33bbf2025-02-03T05:52:42ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/88659818865981PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-WavesShiwei Lu0Chuanbo Zhou1Zhen Zhang2Ling Ji3Nan Jiang4School of Urban Construction, Yangtze University, No. 1 Nanhuan Road, Jingzhou 434023, Hubei, ChinaFaculty of Engineering, China University of Geosciences, No. 388 Lumo Road, Wuhan 430074, Hubei, ChinaFaculty of Engineering, China University of Geosciences, No. 388 Lumo Road, Wuhan 430074, Hubei, ChinaFaculty of Engineering, China University of Geosciences, No. 388 Lumo Road, Wuhan 430074, Hubei, ChinaFaculty of Engineering, China University of Geosciences, No. 388 Lumo Road, Wuhan 430074, Hubei, ChinaThe open-pit mining slopes continue to become higher and steeper with the continuous exploitation of near-surface mineral resources. The blasting excavation exerts a significance influence on the slope stability. In fact, intact rock slopes do not exist and slope stability is controlled by the geological defects. In this paper, the stability of a rock slope imbedded with a fault is considered. The P-wave component of blasting seismic waves is focused on and the fault is simplified as a semi-infinite crack. In background of Daye iron mine, the peak particle velocity (PPV) threshold is determined based on the linear elastic fracture dynamics. The influence of frequency, Young's modulus, and Poisson's ratio is studied to modify the PPV threshold. Results show that (1) the PPV threshold decreases with the increasing Young's modulus and Poisson's ratio, but increases with the increasing frequency; (2) the initiation angle is immune to Young's modulus and the frequency, and only depends on the Poisson's ratio; (3) the PPV criterion is finally determined as 1.47 cm/s when the frequency f ≤ 10 Hz, 1.47 cm/s–3.30 cm/s when 10 Hz < f ≤ 50 Hz and 3.37 cm/s–6.59 cm/s when f > 50 Hz, which are far less than that of intact rock slopes; (4) The north slope is quite safe if the proposed PPV threshold is not violated due to the variation range of the initiation angle θ0.http://dx.doi.org/10.1155/2020/8865981
spellingShingle Shiwei Lu
Chuanbo Zhou
Zhen Zhang
Ling Ji
Nan Jiang
PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves
Shock and Vibration
title PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves
title_full PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves
title_fullStr PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves
title_full_unstemmed PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves
title_short PPV Criterion of a Rock Slope Imbedded with a Fault subjected to Blasting P-Waves
title_sort ppv criterion of a rock slope imbedded with a fault subjected to blasting p waves
url http://dx.doi.org/10.1155/2020/8865981
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