Mechanical anisotropy of columnar jointed basalts: An example from the Baihetan hydropower station, China

doi:10.1016/j.enggeo.2014.03.019

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Mechanical anisotropy of columnar jointed basalts: An example from the Baihetan hydropower station, China
	Hatzor, Yossef H.2; Jiang, Quan 1; Feng, Xia-ting1 ; Hao, Xian-jie 1; Li, Shao-jun 1
刊名	ENGINEERING GEOLOGY
	2014
卷号	175 页码:35-45
关键词	Mechanical anisotropy Transverse isotropy Columnar basalts Rock joints Rock mass
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2014.03.019
英文摘要	Columnar jointed basalts are characterized by a self-organized joint network of discontinuities and pose a difficult challenge for geotechnical engineering design due to their inherent anisotropic nature. We explore here the anisotropic characteristics of the columnar basalt formation in the Chinese Baihetan hydropower station, including aspects of the geometrical rock structure, deformation, and strength anisotropy. Site investigations reveal that a typical cross section of the columnar basalt blocks is mainly quadrangular and pentagonal with an average edge length of 0.152 m. Three types of joints with different macro- and micro-characteristics form the columnar jointed rock mass and are identified by scanning electron microscopy. In situ ultrasonic tests further confirm that the columnar basalt prisms exhibit transverse isotropy with the plane of isotropy perpendicular to the column axis, as can also be observed in the field. Strength anisotropy is confirmed by point load and uniaxial compression tests. The mechanical and anisotropic characteristics of Baihetan's jointed basalt mass can be explained by its multi-scale joints pattern by means of Goodman's stiffness equation. We find that the anisotropic coefficients obtained for its deformability and strength are similar for all testing methods employed, including in situ P wave velocity, point load tests, and uniaxial compression tests. This result confirms the strong anisotropic effect in these rock masses and facilitates, an issue that must be considered when assigning input parameters for various classification and numerical analyses schemes. (C) 2014 Elsevier B.V. All rights reserved.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000336704400004
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3604]
专题	岩土力学所知识全产出_期刊论文岩土力学所知识全产出国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.Ben Gurion Univ Negev, Dept Geol Environm Sci
推荐引用方式 GB/T 7714	Hatzor, Yossef H.,Jiang, Quan,Feng, Xia-ting,et al. Mechanical anisotropy of columnar jointed basalts: An example from the Baihetan hydropower station, China[J]. ENGINEERING GEOLOGY,2014,175:35-45.
APA	Hatzor, Yossef H.,Jiang, Quan,Feng, Xia-ting,Hao, Xian-jie,&Li, Shao-jun.(2014).Mechanical anisotropy of columnar jointed basalts: An example from the Baihetan hydropower station, China.ENGINEERING GEOLOGY,175,35-45.
MLA	Hatzor, Yossef H.,et al."Mechanical anisotropy of columnar jointed basalts: An example from the Baihetan hydropower station, China".ENGINEERING GEOLOGY 175(2014):35-45.