Influence of Loading System Stiffness on Post-peak Stress-Strain Curve of Stable Rock Failures

doi:10.1007/s00603-017-1231-1

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	Influence of Loading System Stiffness on Post-peak Stress-Strain Curve of Stable Rock Failures
	Xu, Y. H.1,2; Cai, M.1,2,3
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2017
卷号	50 期号:9 页码:2255-2275
关键词	Loading system stiffness Stiff test machines Stable rock failure Post-peak stress-strain curve Numerical modeling
ISSN号	0723-2632
DOI	10.1007/s00603-017-1231-1
英文摘要	It is well known from laboratory testing that the rock failure process becomes unstable in a soft test machine due to excessive energy released from the machine. Great efforts had been devoted to increasing the loading system stiffness (LSS) of laboratory test machines to ensure that the post-peak stress-strain curve of rock can be obtained for underground rock engineering design. A comprehensive literature review on the development of stiff test machines reveals that because of the differences in the manufacturing arrangement of the test machines, LSS values of the test machines used for rock property testing are always finite and vary in a large range, and the influence of LSS on stable rock failure is less understood. A FEM-based numerical experiment is carried out to study the influence of LSS on the stress-strain curves of stable rock failure in uniaxial compression, with a focus on the post-peak deformation stage. Three test machine loadings including idealized rigid loading, platen loading, and frame-platen loading with finite LSS are considered, and the simulation results are analyzed and compared. The modeling results obtained from the simulations indicate that even if the LSS value is large enough to inhibit unstable rock failure, as long as LSS is finite, it has an influence on the post-peak stress-strain curve of rock. It is revealed that because the input energy supplied by the external energy source to drive the stable rock failure process is affected by the finite LSS of a test machine, the post-peak descending slopes of the stress-strain curves are all steeper than the post-peak descending slope obtained under an ideal loading condition of infinite LSS. An insight from this numerical experiment is that it might be more feasible to develop laboratory test machines with variable LSS that can match the local mine stiffness in the field for rock property testing.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000408918600001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4131]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Laurentian Univ, MIRARCO; 2.Laurentian Univ, Bharti Sch Engn; 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn
推荐引用方式 GB/T 7714	Xu, Y. H.,Cai, M.. Influence of Loading System Stiffness on Post-peak Stress-Strain Curve of Stable Rock Failures[J]. ROCK MECHANICS AND ROCK ENGINEERING,2017,50(9):2255-2275.
APA	Xu, Y. H.,&Cai, M..(2017).Influence of Loading System Stiffness on Post-peak Stress-Strain Curve of Stable Rock Failures.ROCK MECHANICS AND ROCK ENGINEERING,50(9),2255-2275.
MLA	Xu, Y. H.,et al."Influence of Loading System Stiffness on Post-peak Stress-Strain Curve of Stable Rock Failures".ROCK MECHANICS AND ROCK ENGINEERING 50.9(2017):2255-2275.