Insights into statistical structural characteristics and deformation properties of columnar jointed basalts: field investigation in the Baihetan Dam base, China

doi:10.1007/s10064-017-1029-0

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

	Insights into statistical structural characteristics and deformation properties of columnar jointed basalts: field investigation in the Baihetan Dam base, China
	Zhang, Jiancong 1; Cui, Jie 1; Jiang, Quan 1; Feng, Xiating1 ; Li, Shaojun 1; Liu, Junfeng 2; Chen, Wenfu 2; Pei, Shufeng 1
刊名	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
	2018
卷号	77 期号:2 页码:775-790
关键词	Columnar jointed basalt Irregular structural feature Internal joint Deformation anisotropy Unloading excavation Columnar joint tensor
ISSN号	1435-9529
DOI	10.1007/s10064-017-1029-0
英文摘要	The columnar jointed basalt (CJB) in the left-bank dam foundation of the Baihetan hydropower station, China, is a special jointed rock mass with a columnar cylinder structure. A field investigation revealed three types of joints developing in the CJB: (1) columnar joints, (2) internal steeply dipping joints (ISDJ), and (3) internal gently dipping joints (IGDJ). A uniform distribution survey lines method (UDSLM) is proposed to describe quantitatively the spatial structural features of CJB exposed in limited outcrops. The visible spacing of internal joints in CJB is found to evolve; joint spacing decreases with increased degrees of weathering, disturbance, and time after unloading excavation. Combined with the actual structure, the formation mechanism of CJB is discussed from the structure of a single column to the whole rock mass, based on the contraction hypothesis. A columnar joint tensor, which is closely related to the CJB deformation characteristics, is established for describing the complex columnar joint network in the three-dimensional space based on the measurement data with the UDSLM. In addition, the structural characteristics of intact columns were exposed through dismantling cuboid specimens of 0.5 m edge lengths and 1.0 m height, verifying the rationality of the UDSLM and the evaluation of structural characteristics of CJB in the Baihetan dam foundation. This in situ study presents an in-depth understanding of CJB structure and provides meaningful guidance for excavation and supporting reinforcement for the CJB exposed on the Chinese Baihetan dam foundation.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000431300600025
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4268]
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.China Three Gorges Project Corp
推荐引用方式 GB/T 7714	Zhang, Jiancong,Cui, Jie,Jiang, Quan,et al. Insights into statistical structural characteristics and deformation properties of columnar jointed basalts: field investigation in the Baihetan Dam base, China[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2018,77(2):775-790.
APA	Zhang, Jiancong.,Cui, Jie.,Jiang, Quan.,Feng, Xiating.,Li, Shaojun.,...&Pei, Shufeng.(2018).Insights into statistical structural characteristics and deformation properties of columnar jointed basalts: field investigation in the Baihetan Dam base, China.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,77(2),775-790.
MLA	Zhang, Jiancong,et al."Insights into statistical structural characteristics and deformation properties of columnar jointed basalts: field investigation in the Baihetan Dam base, China".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 77.2(2018):775-790.