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Excavation Damage Zone in an Underground Opening
https://orcid.org/http://orcid.org/0000-0002-5254-8401
In civil construction projects, blasting inevitably causes a zone of damage to the peripheral rock mass. However, the extent of the damage zone should be minimum and should not pose threat to the safety and stability of the underground structures. Investigations have been carried to evaluate EDZ by Laboratory tests on the rock core samples. Geological logging of the rock core samples reveals that due to blast induced damage in the surrounding rock mass incurs significant damage and the rock mas quality index, Q is reduced by 10–15%. Analysis of variation of the rock mass properties in terms of RQD, Core recovery (CR) and maximum core length revealed that the blast induced damage significantly reduces RQD leading to deterioration in rock mass quality, particularly in the immediate vicinity of the underground openings. It has been observed that the deteriorating effect of the blasting has been enhanced in places where the Joint alternation number (Ja) is higher. The higher extent of damaged zone significantly reduces RQD and damage is exhibited by the large difference between RQD and Core recovery. Based on the experimental investigation an empirical correlation is suggested to estimate the excavation damage zone around an underground opening. It has been observed that the overbreak (%) and damage distance both can be ex-pressed in terms of rock mass quality index (Q), perimeter charge factor (qp), specific charge (q), maximum charge per delay (W) and advancement (Af) and confinement factors (Cf). Proposed empirical correlations may be used for estimation of the overbreak and extent of the damage around an underground opening. In both the proposed correlations, rock mass quality, blast design parameters and size of opening have been considered. The proposed correlations are based on readily available site parameters which may be helpful to the practicing engineers and geologists in the optimization of the support design of rock mass.
Excavation Damage Zone in an Underground Opening
https://orcid.org/http://orcid.org/0000-0002-5254-8401
In civil construction projects, blasting inevitably causes a zone of damage to the peripheral rock mass. However, the extent of the damage zone should be minimum and should not pose threat to the safety and stability of the underground structures. Investigations have been carried to evaluate EDZ by Laboratory tests on the rock core samples. Geological logging of the rock core samples reveals that due to blast induced damage in the surrounding rock mass incurs significant damage and the rock mas quality index, Q is reduced by 10–15%. Analysis of variation of the rock mass properties in terms of RQD, Core recovery (CR) and maximum core length revealed that the blast induced damage significantly reduces RQD leading to deterioration in rock mass quality, particularly in the immediate vicinity of the underground openings. It has been observed that the deteriorating effect of the blasting has been enhanced in places where the Joint alternation number (Ja) is higher. The higher extent of damaged zone significantly reduces RQD and damage is exhibited by the large difference between RQD and Core recovery. Based on the experimental investigation an empirical correlation is suggested to estimate the excavation damage zone around an underground opening. It has been observed that the overbreak (%) and damage distance both can be ex-pressed in terms of rock mass quality index (Q), perimeter charge factor (qp), specific charge (q), maximum charge per delay (W) and advancement (Af) and confinement factors (Cf). Proposed empirical correlations may be used for estimation of the overbreak and extent of the damage around an underground opening. In both the proposed correlations, rock mass quality, blast design parameters and size of opening have been considered. The proposed correlations are based on readily available site parameters which may be helpful to the practicing engineers and geologists in the optimization of the support design of rock mass.
Excavation Damage Zone in an Underground Opening
https://orcid.org/http://orcid.org/0000-0002-5254-8401
In civil construction projects, blasting inevitably causes a zone of damage to the peripheral rock mass. However, the extent of the damage zone should be minimum and should not pose threat to the safety and stability of the underground structures. Investigations have been carried to evaluate EDZ by Laboratory tests on the rock core samples. Geological logging of the rock core samples reveals that due to blast induced damage in the surrounding rock mass incurs significant damage and the rock mas quality index, Q is reduced by 10–15%. Analysis of variation of the rock mass properties in terms of RQD, Core recovery (CR) and maximum core length revealed that the blast induced damage significantly reduces RQD leading to deterioration in rock mass quality, particularly in the immediate vicinity of the underground openings. It has been observed that the deteriorating effect of the blasting has been enhanced in places where the Joint alternation number (Ja) is higher. The higher extent of damaged zone significantly reduces RQD and damage is exhibited by the large difference between RQD and Core recovery. Based on the experimental investigation an empirical correlation is suggested to estimate the excavation damage zone around an underground opening. It has been observed that the overbreak (%) and damage distance both can be ex-pressed in terms of rock mass quality index (Q), perimeter charge factor (qp), specific charge (q), maximum charge per delay (W) and advancement (Af) and confinement factors (Cf). Proposed empirical correlations may be used for estimation of the overbreak and extent of the damage around an underground opening. In both the proposed correlations, rock mass quality, blast design parameters and size of opening have been considered. The proposed correlations are based on readily available site parameters which may be helpful to the practicing engineers and geologists in the optimization of the support design of rock mass.
Excavation Damage Zone in an Underground Opening
Lecture Notes in Civil Engineering
Verma, Amit Kumar (editor) / Singh, T. N. (editor) / Mohamad, Edy Tonnizam (editor) / Mishra, A. K. (editor) / Gamage, Ranjith Pathegama (editor) / Bhatawdekar, Ramesh (editor) / Wilkinson, Stephen (editor) / Verma, Harsh Kumar (author)
International Conference on Geotechnical Issues in Energy, Infrastructure and Disaster Management ; 2024 ; Patna, India
2024-12-01
15 pages
Article/Chapter (Book)
Electronic Resource
English
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