Mechanical Mechanism and Shaping Effect of Tunnel Blasting Construction in Rock with Weak Interlayer

Mingfeng Lei, Rui He, Linghui Liu (), Ningxin Sun, Guifang Qin and Yunliang Zhang
Additional contact information
Mingfeng Lei: School of Civil Engineering, Central South University, Changsha 410075, China
Rui He: School of Civil Engineering, Central South University, Changsha 410075, China
Linghui Liu: School of Civil Engineering, Central South University, Changsha 410075, China
Ningxin Sun: Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250031, China
Guifang Qin: Guizhou Road & Bridge Group Co., Ltd., Guiyang 550081, China
Yunliang Zhang: School of Civil Engineering, Central South University, Changsha 410075, China

Sustainability, 2022, vol. 14, issue 20, 1-23

Abstract: The weak interlayer, as a problematic geological body during tunnel construction, greatly influences the propagation of the blasting stress wave, the blasting excavation qualities, and the explosion efficiency. A series of numerical models were established to study the changes in the propagation process of blasting stress waves and the failure morphology of the surrounding rock mass, aiming to reveal the weak interlayer’s influence mechanism. The result indicates that the weak interlayer’s existence reduces the propagation velocity and stress peak of the stress wave at barred zones but strengthens the peak stress at reflection zones, which leads to an asymmetrical distribution of rock damage. Furthermore, the type and distribution of the weak interlayer were classified and generalized into four types. The tunnel blasting outlines under different types of weak interlayers are derived through numerical modeling for designing references. A strategy to resist tunnel overbreak and underbreak was proposed combined with previous work. The actual blasting solution is compared to the designed blasting solution with optimised blasting parameters.

Keywords: tunnel construction; barrier effect; blasting shaping effect; weak interlayer; stress wave propagation; overbreak and underbreak (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/2071-1050/14/20/13278/pdf (application/pdf)
https://www.mdpi.com/2071-1050/14/20/13278/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:14:y:2022:i:20:p:13278-:d:943479

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().