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Risk assessment for the cascading failure of underground pillar sections considering interaction between pillars

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Title: Risk assessment for the cascading failure of underground pillar sections considering interaction between pillars
Authors: Zhou, Z
Zang, H
Cao, W
Du, X
Chen, L
Ke, C
Item Type: Journal Article
Abstract: The cascading failure of underground pillar groups poses disastrous threats to miners and surface structures. Assessing the risk of underground mining panels contributes to the prevention and control of the catastrophic failure. To resolve the challenge in quantifying the effect of failure of a single pillar on the risk of an entire pillar group, a new risk assessment model incorporating the stability of individual pillars and the load transfer between pillars was proposed to determine the cascading failure of pillar groups. The load transfer process from failed pillars to adjacent ones was effectively quantified by the relationship between transferred incremental load and transferring distance. The influence of uncertainties of pillar strength, caused either by intrinsic variability of a single pillar (quantified by coefficient of variation COV) or nonuniform deterioration process of pillar groups (quantified by correlation coefficient rou), was investigated on the probability of cascading failure. Besides, risk mapping was performed on two representative historical collapsed pillar groups using the risk evaluation method proposed to illustrate the risk level of each pillar to trigger cascading failure. The proposed model could represent realistic load transfer process and provide reliable risk assessment results for pillar groups. The results showed that the reliability of pillar groups is significantly influenced by both intrinsic variability in pillar strength and intercorrelation of strength between pillars. The probability of cascading failure increases with increasing COV, which verifies that geological uncertainties increase the risk of pillar groups. The impact of COV on probability gradually decreases to neglectable levels as rou increases to 1, which means that the synchronous variation of pillar strength among a pillar group can significantly compensate for the impact of COV. The proposed approach provides a distinct perspective on understanding sudden failure of high-risk pillars and contributing to the risk control for abandoned pillar groups.
Issue Date: 1-Dec-2019
Date of Acceptance: 23-Oct-2019
URI: http://hdl.handle.net/10044/1/74649
DOI: 10.1016/j.ijrmms.2019.104142
ISSN: 0020-7624
Publisher: Elsevier
Journal / Book Title: International Journal of Rock Mechanics and Mining Sciences
Volume: 124
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: 0905 Civil Engineering
0914 Resources Engineering and Extractive Metallurgy
Mining & Metallurgy
Publication Status: Published
Online Publication Date: 2019-10-31
Appears in Collections:Earth Science and Engineering