Excavation damaged zone division and time-dependency deformation prediction: A case study of excavated rock mass at Xiaowan Hydropower Station

doi:10.1016/j.enggeo.2020.105668

	Excavation damaged zone division and time-dependency deformation prediction: A case study of excavated rock mass at Xiaowan Hydropower Station
	Bao, Han 2; Zhang, Keke 2; Yan, Changgen 2; Lan, Hengxing 3; Wu, Faquan 1; Zheng, Han 4
刊名	ENGINEERING GEOLOGY
	2020-07-01
卷号	272 页码:17
关键词	Excavation damaged zone division Excavation heavily damaged zone Acoustic wave Time-dependency model Unloading depth prediction
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2020.105668
通讯作者	Yan, Changgen(ycg@chd.edu.cn)
英文摘要	Rock mass excavation is accompanied by rock deformation during unloading, which degrades the quality of rock mass and significantly affects the safety and stability of rock mass engineering. Taking the excavated rock mass from the dam foundation of Xiaowan Hydropower Station as the study object, long-time single hole acoustic tests (SHAT) were conducted in the dam abutment rock mass, with the changes in the acoustic wave velocity recorded. Then, a new method quantifying the excavation damaged zone (EDZ) was proposed according to the cumulative degradation rate of acoustic wave velocity, and a time-dependency model for evaluating the evolution of the excavation heavily damaged zone (EHDZ) was established. The results indicated that the cumulative degradation rate curves of the wave velocity along the boreholes exhibited significant differences in time and space. The depth corresponding to the inflection point on the curve can be regarded as the bottom boundary of the EHDZ, which could be used to generate time-dependency curves, and demonstrate the spatiotemporal evolution process for the EHDZ. The time-dependency curves can be classified into three categories. The differences between the classified curves are related to the depth of the initial EHDZ (EHDZ(o)), rock mass elastic modulus (E), and unloading stress (sigma(u)). The time-dependency model for the EHDZ evolution process follows a negative exponential function. The EHDZ(o) depth, E, and sigma(u) can determine the coefficients of the model. The model provides an effective method to predict EHDZ depths at different times after rock mass excavation. The prediction results are of considerable significance for researches on the unloading failure and the selection of rock mass reinforcement, which would ensure the stability and safety of the rock mass engineering during construction and operation.
资助项目	National Natural Science Foundation of China[41807246] ; National Natural Science Foundation of China[41927806] ; National Natural Science Foundation of China[41790443] ; Natural Science Foundation of Shaanxi Province[2018JQ4017] ; Natural Science Foundation of Shaanxi Province[2020JQ-349] ; Fundamental Research Funds for the Central Universities, CHD[300102219217] ; Fundamental Research Funds for the Central Universities, CHD[300102290201]
WOS关键词	BRITTLE FAILURE ; DISTURBED ZONE ; BEHAVIOR ; PERMEABILITY ; SIMULATION ; FRACTURES ; EVOLUTION ; MODEL
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000537626200013
资助机构	National Natural Science Foundation of China ; Natural Science Foundation of Shaanxi Province ; Fundamental Research Funds for the Central Universities, CHD
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/159502]
专题	中国科学院地理科学与资源研究所
通讯作者	Yan, Changgen
作者单位	1.Shaoxing Univ, Shaoxing 312000, Zhejiang, Peoples R China 2.Changan Univ, Sch Highway, Xian 710064, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China 4.Changan Univ, Sch Water & Environm, Minist Educ, Key Lab Subsurface Hydrol & Ecol Effect Arid Reg, Xian 710064, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Bao, Han,Zhang, Keke,Yan, Changgen,et al. Excavation damaged zone division and time-dependency deformation prediction: A case study of excavated rock mass at Xiaowan Hydropower Station[J]. ENGINEERING GEOLOGY,2020,272:17.
APA	Bao, Han,Zhang, Keke,Yan, Changgen,Lan, Hengxing,Wu, Faquan,&Zheng, Han.(2020).Excavation damaged zone division and time-dependency deformation prediction: A case study of excavated rock mass at Xiaowan Hydropower Station.ENGINEERING GEOLOGY,272,17.
MLA	Bao, Han,et al."Excavation damaged zone division and time-dependency deformation prediction: A case study of excavated rock mass at Xiaowan Hydropower Station".ENGINEERING GEOLOGY 272(2020):17.