Study on the Weakening Law and Classification of Rock Mass Damage under Blasting Conditions

Rui Yue, Kegang Li, Qingci Qin, Mingliang Li and Meng Li
Additional contact information
Rui Yue: School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Kegang Li: School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Qingci Qin: School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Mingliang Li: School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Meng Li: Guohua (Jiangsu) Wind Power Co., Ltd., Dongtai 224200, China

Energies, 2022, vol. 15, issue 5, 1-13

Abstract: To study the effects of declining mechanical parameters caused by blasting excavation on slopes, we introduced the damage degree index D s, and established a relationship between D s and the disturbance factor D in the Hoek–Brown criterion, along with a basic quality index BQ for the rock mass. We then explored the change law for the degree of rock damage D s as a function of the disturbance factor D . We also used a phosphate mine slope in Guizhou Province for reference, and analyzed the process of damage evolution of the slope based on the RHT (Riedel-Hiermaier-Thoma Constitution) in LS-DYNA (Yunnan, China). Results showed a direct relationship between the GSI value in the Hoek–Brown criterion and the initial damage degree of the slope. As D s increases, D increases exponentially. However, the compressive strength, elastic modulus, cohesion, and internal friction angle decreased nonlinearly, and the tensile strength of the rock mass decreased linearly. Among these parameters, the compressive strength decreased the most rapidly, while the internal friction angle decreased slowly. We also established a new grade for rock self-stabilization with D s as the evaluation standard. Thus, these results may provide a theoretical basis for determining the mechanical properties of rocks for future slope protection and stability evaluations.

Keywords: slope; blasting excavation; Hoek–Brown criterion; damage degree; damage classification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/5/1809/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/5/1809/ (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:jeners:v:15:y:2022:i:5:p:1809-:d:761530

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

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