An improved numerical manifold method for simulation of sequential excavation in fractured rocks

doi:10.1016/j.ijrmms.2013.10.005

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	An improved numerical manifold method for simulation of sequential excavation in fractured rocks
	Tal, Yuval 1; Hatzor, Yossef H.1,2; Feng, Xia-Ting2
	2014
发表期刊	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
ISSN	1365-1609
卷号	65 期号:-页码:116-128
摘要	We improve the original numerical manifold method (NMM) capability to correctly model the stability of underground openings embedded in discontinuous rock masses under high in situ stress conditions by implementing an algorithm which models the excavation sequence during NMM simulations, starting with a domain with no opening at all and progressively adding openings according to the planned construction phases. The significance of this improvement is demonstrated using the case of Zedekiah cave underneath the old city of Jerusalem, excavated 2000 years ago at a shallow depth in a highly discontinuous rock mass and still stands unsupported. The results clearly show that modeling underground openings in discontinuous rocks without consideration of the excavation sequence is overly conservative. We proceed with developing a new procedure to impose high initial stresses in NMM for accurate deformation modeling of deep underground excavations, and verify our suggested approach using the analytical Kirsch solution. Finally, we apply our enhanced NMM code to the Jinping hydroelectric project tunnels in Sichuan Province, China. Using very accurate sliding micrometer data obtained during the excavation of a research tunnel within the Jinping tunnel complex we constrain the in situ stress field at depth by inversion of the measured displacement data using the modified NMM code. The results provide a quantitative assessment of the in situ stress held Jinping tunnels at a depth of 2525 in below ground surface, where the execution of hi situ stress measurements by conventional procedures proves an extremely challenging task. (C) 2013 Elsevier Ltd. All rights reserved
关键词	Discrete element modeling Numerical manifold method In situ stresses Excavation sequence Jinping hydroelectric project
DOI	10.1016/j.ijrmms.2013.10.005
收录类别	SCI
语种	英语
WOS研究方向	Engineering ; Mining & Mineral Processing
WOS类目	Engineering, Geological ; Mining & Mineral Processing
WOS记录号	WOS:000331715500011
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.198/handle/2S6PX9GI/3547
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.Ben Gurion Univ Negev, Dept Geol & Environm Sci; 2.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech
推荐引用方式 GB/T 7714	Tal, Yuval,Hatzor, Yossef H.,Feng, Xia-Ting. An improved numerical manifold method for simulation of sequential excavation in fractured rocks[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2014,65(-):116-128.
APA	Tal, Yuval,Hatzor, Yossef H.,&Feng, Xia-Ting.(2014).An improved numerical manifold method for simulation of sequential excavation in fractured rocks.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,65(-),116-128.
MLA	Tal, Yuval,et al."An improved numerical manifold method for simulation of sequential excavation in fractured rocks".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 65.-(2014):116-128.

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