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Load Transfer Behavior During Cascading Pillar Failure: An Experimental Study
https://orcid.org/0000-0001-9912-2152
Abstract In order to reveal the load transfer mechanism during cascading pillar failure, compressive tests on treble-pillar specimens were conducted under soft and stiff loading conditions, where the stiffness of the test machine was adjusted with a disc spring group. Experimental results showed that the load transfer behavior of treble-pillar specimen could only be reproduced under soft loading condition when the rapid elastic rebound is achievable with disc spring group. The load transfer behavior of treble-pillar specimen is governed by energy storage characteristics of test machine and the mechanical properties of three rock specimens. In this respect, the failure behavior of treble-pillar specimen under soft loading condition was summarized into the following three failure modes: successive failure mode, compound failure mode and domino failure mode. Additionally, a theoretical model was proposed to further explain the physical mechanism of load transfer behavior, where the theoretical results of load transfer and elastic rebound of disc spring group were in good agreement with the experimental results. Finally, it was concluded that the elastic deformation of near-field surrounding rockmass (or the soft loading condition) was the necessary condition for load transfer of multiple pillars; and the rapid elastic rebound of near-field surrounding rockmass was the physical essence of load transfer behavior. This study may contribute to understanding the load transfer mechanism among pillars and to optimizing the design of room-and-pillar stopes during underground mining.
Highlights The soft loading condition of test machine is realized by adjusting the stiffness of disc spring group.The experiments on treble-pillar specimens are conducted to reveal the load transfer mechanism during cascading pillar failure.Three failure modes of treble-pillar specimen are successive failure, compound failure and domino failure.
Load Transfer Behavior During Cascading Pillar Failure: An Experimental Study
https://orcid.org/0000-0001-9912-2152
Abstract In order to reveal the load transfer mechanism during cascading pillar failure, compressive tests on treble-pillar specimens were conducted under soft and stiff loading conditions, where the stiffness of the test machine was adjusted with a disc spring group. Experimental results showed that the load transfer behavior of treble-pillar specimen could only be reproduced under soft loading condition when the rapid elastic rebound is achievable with disc spring group. The load transfer behavior of treble-pillar specimen is governed by energy storage characteristics of test machine and the mechanical properties of three rock specimens. In this respect, the failure behavior of treble-pillar specimen under soft loading condition was summarized into the following three failure modes: successive failure mode, compound failure mode and domino failure mode. Additionally, a theoretical model was proposed to further explain the physical mechanism of load transfer behavior, where the theoretical results of load transfer and elastic rebound of disc spring group were in good agreement with the experimental results. Finally, it was concluded that the elastic deformation of near-field surrounding rockmass (or the soft loading condition) was the necessary condition for load transfer of multiple pillars; and the rapid elastic rebound of near-field surrounding rockmass was the physical essence of load transfer behavior. This study may contribute to understanding the load transfer mechanism among pillars and to optimizing the design of room-and-pillar stopes during underground mining.
Highlights The soft loading condition of test machine is realized by adjusting the stiffness of disc spring group.The experiments on treble-pillar specimens are conducted to reveal the load transfer mechanism during cascading pillar failure.Three failure modes of treble-pillar specimen are successive failure, compound failure and domino failure.
Load Transfer Behavior During Cascading Pillar Failure: An Experimental Study
https://orcid.org/0000-0001-9912-2152
Abstract In order to reveal the load transfer mechanism during cascading pillar failure, compressive tests on treble-pillar specimens were conducted under soft and stiff loading conditions, where the stiffness of the test machine was adjusted with a disc spring group. Experimental results showed that the load transfer behavior of treble-pillar specimen could only be reproduced under soft loading condition when the rapid elastic rebound is achievable with disc spring group. The load transfer behavior of treble-pillar specimen is governed by energy storage characteristics of test machine and the mechanical properties of three rock specimens. In this respect, the failure behavior of treble-pillar specimen under soft loading condition was summarized into the following three failure modes: successive failure mode, compound failure mode and domino failure mode. Additionally, a theoretical model was proposed to further explain the physical mechanism of load transfer behavior, where the theoretical results of load transfer and elastic rebound of disc spring group were in good agreement with the experimental results. Finally, it was concluded that the elastic deformation of near-field surrounding rockmass (or the soft loading condition) was the necessary condition for load transfer of multiple pillars; and the rapid elastic rebound of near-field surrounding rockmass was the physical essence of load transfer behavior. This study may contribute to understanding the load transfer mechanism among pillars and to optimizing the design of room-and-pillar stopes during underground mining.
Highlights The soft loading condition of test machine is realized by adjusting the stiffness of disc spring group.The experiments on treble-pillar specimens are conducted to reveal the load transfer mechanism during cascading pillar failure.Three failure modes of treble-pillar specimen are successive failure, compound failure and domino failure.
Load Transfer Behavior During Cascading Pillar Failure: An Experimental Study
Dong, Hangyu (author) / Zhu, Wancheng (author) / Hou, Chen (author) / Liu, Xige (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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