Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit
Joint Authors
Lei, Zhen
Chen, Qing
Zhao, Wen
Li, Yu-Jing
Gao, Zheng-Hua
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-12-09
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
To ensure the safe and efficient excavation of ultradeep foundation pits in a complex urban environment, the ultradeep foundation pit excavation project of Liuguangmen Urban Complex in Guiyang City was taken as the study point.
A high-efficiency blasting method was proposed for the excavation of vibration-isolating slot and electronic detonators, and a three-dimensional spatial calculation model of the foundation pit structure was established.
In addition, the field test and numerical simulation of the blasting vibration were developed.
The feasibility of the high-efficiency blasting method was demonstrated, and the propagation law of the dynamic response characteristic parameters of the structure was explored using an electronic detonator and vibration-isolating slot.
The results show that the electronic detonator carried out peak shaving within the group, unloading waves between the groups, and the blocking effect of the vibration-isolating slot, and all these effectively reduced the peak stress and peak particle vibration velocity, evenly distributed the vibration velocity, and guaranteed the safety of the surrounding existing buildings, proving the feasibility of the efficient blasting method.
There is a “wall effect” at the supporting pile, whose propagation velocity is lower than that inside the rock mass, and the PPV is radial X > tangential Y > vertical Z.
The peak values of stress, strain, and PPV all decrease with increasing supporting pile height, and there is an inflection point at 20 m.
The internal nodes of the pile reciprocate without sharp change and failure in displacement.
The peak displacement of different nodes is in the order X > Y > Z with increasing pile height, and the maximum peak value is 0.08 mm.
American Psychological Association (APA)
Lei, Zhen& Chen, Qing& Zhao, Wen& Li, Yu-Jing& Gao, Zheng-Hua. 2020. Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit. Shock and Vibration،Vol. 2020, no. 2020, pp.1-12.
https://search.emarefa.net/detail/BIM-1210524
Modern Language Association (MLA)
Lei, Zhen…[et al.]. Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit. Shock and Vibration No. 2020 (2020), pp.1-12.
https://search.emarefa.net/detail/BIM-1210524
American Medical Association (AMA)
Lei, Zhen& Chen, Qing& Zhao, Wen& Li, Yu-Jing& Gao, Zheng-Hua. Dynamic Response Characteristics of the Structures under Excavation by High-Efficiency Blasting in the Urban Ultradeep Foundation Pit. Shock and Vibration. 2020. Vol. 2020, no. 2020, pp.1-12.
https://search.emarefa.net/detail/BIM-1210524
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1210524