Structural characteristics of columnar jointed basalt in drainage tunnel of Baihetan hydropower station and its influence on the behavior of P-wave anisotropy

doi:10.1016/j.enggeo.2019.105304

	Structural characteristics of columnar jointed basalt in drainage tunnel of Baihetan hydropower station and its influence on the behavior of P-wave anisotropy
	Xia, Yingjie 2,3; Zhang, Chuanqing 2,3; Zhou, Hui 2,3; Chen, Jianlin 1; Gao, Yang 2,3; Liu, Ning 1; Chen, Pingzhi 1
刊名	ENGINEERING GEOLOGY
	2020
卷号	264 页码:17
关键词	Columnar jointed rock mass Structural characteristics Statistical analysis Anisotropy P-wave characteristics
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2019.105304
英文摘要	Researches about the structural characteristics of rock mass are the basis for understanding their failure modes, mechanism properties as well as evaluation of structural stability during the process of excavation. Natural columnar jointed basalt has complex structures and exhibits remarkable anisotropy and size effect. In this study, the observation window method was firstly applied to describe the natural columnar joints and pillar shapes at engineering scale and then the structural characteristics of columnar joints were analyzed. The roughness of columnar joints scanned from large-size rock core obtained at drainage tunnel #1-1 was secondly investigated based on the 3D scanning method. Some techniques, such as field statistical analysis and CT scanning were used to analyse the characteristics of internal implicit joints in columnar jointed basalt. Thirdly, the large scale columnar jointed basalt cores were tested by P-wave, which assisted to investigating the anisotropy of columnar jointed basalt. The experimental and analytical results indicate that, at the engineering scale, natural columnar jointed basalt is heterogeneous, exhibiting the features of mosaic structure and mainly quadrilateral in shape. At the large-size rock core scale, the roughness of columnar joints is low with the value of 5.558. At the basalt column scale, the internal implicit joints are not randomly distributed, instead, showing obvious tendency. The internal implicit joints and columnar joints are important factors contributing to the special failure mode of columnar jointed basalt. At the rock core scale, with increasing angle between the P-wave propagation direction and column, the anisotropy of columnar jointed basalt core gradually increases and the degree of anisotropy is proportional to the number of columnar joints. The internal implicit joints could also affect the P-wave anisotropy of basalt column and the results in this study can provide some references for projects related to columnar jointed rock mass.
资助项目	National Natural Science Foundation of China[41807269] ; National Natural Science Foundation of China[U1865203] ; National Natural Science Foundation of China[51427803] ; China Postdoctoral Science Foundation[2018M642959] ; Open Projects of Research Center of Coal Resources Safe Mining and Clean Utilization, Liaoning[LNTU17KF12]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000513985500032
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/23541]
专题	中科院武汉岩土力学所
通讯作者	Zhang, Chuanqing; Zhou, Hui
作者单位	1.Power China Huadong Engn Corp, Hangzhou 310014, Zhejiang, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Xia, Yingjie,Zhang, Chuanqing,Zhou, Hui,et al. Structural characteristics of columnar jointed basalt in drainage tunnel of Baihetan hydropower station and its influence on the behavior of P-wave anisotropy[J]. ENGINEERING GEOLOGY,2020,264:17.
APA	Xia, Yingjie.,Zhang, Chuanqing.,Zhou, Hui.,Chen, Jianlin.,Gao, Yang.,...&Chen, Pingzhi.(2020).Structural characteristics of columnar jointed basalt in drainage tunnel of Baihetan hydropower station and its influence on the behavior of P-wave anisotropy.ENGINEERING GEOLOGY,264,17.
MLA	Xia, Yingjie,et al."Structural characteristics of columnar jointed basalt in drainage tunnel of Baihetan hydropower station and its influence on the behavior of P-wave anisotropy".ENGINEERING GEOLOGY 264(2020):17.