Damage Mechanism and Stress Distribution of Gypsum Rock Pillar Subjected to Blasting Disturbance

Shuli Wang, Zhihe Liu, Kaizhi Zhang and Huaichang Zheng
Additional contact information
Shuli Wang: School of Resource and Environmental Engineering, Shandong University of Technology, Zibo 255000, China
Zhihe Liu: School of Resource and Environmental Engineering, Shandong University of Technology, Zibo 255000, China
Kaizhi Zhang: Guizhou Institute of Technology, Guiyang 550003, China
Huaichang Zheng: School of Resource and Environmental Engineering, Shandong University of Technology, Zibo 255000, China

Sustainability, 2022, vol. 14, issue 9, 1-12

Abstract: The room-pillar mining technology of underground gypsum resources results in numerous gypsum rock pillars for controlling and supporting mined gobs, which forms a large area of roof hanging gobs. Owing to weathering and mining activities, gypsum rock pillar damage and failure will occur, thereby inducing a large area of gypsum mined-gob collapse accidents and disasters. Blasting is vital to the stability of gypsum rock pillars and is indispensable in mining engineering. Based on field blasting tests and using wave velocity as the basic parameter to characterise the integrity of gypsum rock, the damage mechanism of gypsum rock pillars subjected to blasting disturbance is investigated. With ten blasting tests, the maximum damage rate is 7.82% along the horizontal direction of pillar, and 3.52% along the vertical direction. The FLAC numerical simulation calculation software is used to analyse the stress distribution law of gypsum rock pillars with disturbances of different strengths from different distances. As the disturbance strength increased, the stress increased with no clear linear relationship; as the disturbance distance increased, the stress decreased gradually with a linear relationship. All stress after disturbance is greater than the original static stress, and lower than the ultimate compressive strength. However, the correlation between blasting tests results and numerical simulation results is poor and is discussed for many factors. The results can provide important guidance and reference for clarifying the damage mechanism of gypsum rock pillars subjected to blasting disturbance, as well as reveal the collapse mechanism of gypsum mined gobs.

Keywords: gypsum mine; rock pillar; blasting disturbance; damage and stress distribution; collapse (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:

Downloads: (external link)
https://www.mdpi.com/2071-1050/14/9/5010/pdf (application/pdf)
https://www.mdpi.com/2071-1050/14/9/5010/ (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:9:p:5010-:d:799282

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 ().