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Bulletin of Engineering Geology and the Environment

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01.03.2023 | Original Paper

Blasting-induced rock damage control in a soft broken roadway excavation using an air deck at the blasthole bottom

verfasst von: Feng Gao, Leihu Tang, Chun Yang, Panlei Yang, Xin Xiong, Wenfeng Wang

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 3/2023

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Abstract

The charge structure in the cutting area has an important practical engineering significance in improving the blasting performance and increasing the excavation work efficiency, especially in tunneling practices with soft and broken surrounding rocks. To contain the excessive damage in the tunnel face of the Meishan Iron Mine, the finite element program LS-DYNA is used to investigate the effect of the charge structure of cutting holes (with an air deck and without an air deck at the blasthole bottom) on the blasting performance in roadway excavation. Numerical results indicated that the blasthole bottom was seriously damaged by blasting under the condition of charge without an air deck. Accordingly, 80-mm bottom air deck length is determined based on analytical calculation, and a numerical simulation was conducted and showed that the air deck could effectively weaken the excessive damage around the blasthole bottom. Specifically, the peak pressure at the monitoring point (10 cm horizontally from the center of the blasthole bottom) with an air deck is 22.1 MPa, which is much smaller than that of the no-air-deck case of 207.1 MPa. The field experimental results indicated that the tunnel face was obviously damaged under the condition of holes without an air deck and the tunnel face was relatively flat under the condition of a blasthole bottom with an air deck, which is consistent with the numerical results. The workload for cleaning loose rock for the next excavation cycle in a 3.5 m advance was reduced from 40 min to around 25 min.

Vorheriger Artikel Study on land subsidence characteristics and deformation evolution mechanism in Caofeidian New Area, Bohai Bay

Nächster Artikel Post-failure analysis of landslide blocking river using the two-phase double-point material point method: a case of western Hubei, China

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Titel: Blasting-induced rock damage control in a soft broken roadway excavation using an air deck at the blasthole bottom
verfasst von: Feng Gao
Leihu Tang
Chun Yang
Panlei Yang
Xin Xiong
Wenfeng Wang
Publikationsdatum: 01.03.2023
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 3/2023
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-023-03087-6

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