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	Evolution of In Situ Rock Mass Damage Induced by Mechanical-Thermal Loading
	Lan H. X. ; Martin C. D. ; Andersson J. C.
	2013
关键词	Brittle rock mass Deep underground In situ Evolution of progressive damage Mechanical-thermal loading canadian geotechnical colloquium shear-fracture westerly granite propagation transition behavior failure
英文摘要	To understand and predict the in situ brittle rock mass damage process induced by a coupled thermo-mechanical loading, the knowledge of rock mass yielding strength, scaling relationship between laboratory and in situ and microstructure characterization is required. Difficulties have been recognized due to the seldom availability of in situ experiment and appropriate numerical methodologies. The A"spo Pillar Stability Experiment was used to monitor the evolution of rock mass damage in a pillar of rock separating two 1.75-m diameter vertical boreholes. The loading of the pillar was controlled using the in situ stresses, excavation geometry, and locally increasing the rock temperature. The induced loading resulted in a complex discontinuum process that involved fracture initiation, propagation, interaction and buckling, all dominated by a tensile mechanism. Tracking this damage process was carried out in two steps. Initially, a three-dimensional numerical model was used to generate the stresses from the excavation geometry and thermal loading. The plane strain stresses, at selected locations where detailed displacement monitoring was available, were then used to track the evolution of damage caused by these induced stresses. The grain-based discrete element modeling approach described in Lan et al. (2010), which captures the grain scale heterogeneity of the rock, was used to establish the extent of damage. Good agreement was found between the predicted and measured temperatures and displacements. The grain-based model provided new insights into the progressive failure process.
出处	Rock Mechanics and Rock Engineering
卷	46
期	1
页	153-168
收录类别	SCI
语种	英语
ISSN号	0723-2632
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30466]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Lan H. X.,Martin C. D.,Andersson J. C.. Evolution of In Situ Rock Mass Damage Induced by Mechanical-Thermal Loading. 2013.

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