On the mechanism of inrush hazards when Denghuozhai Tunnel passing through granite contact zone

doi:10.1016/j.tust.2017.05.008

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

	On the mechanism of inrush hazards when Denghuozhai Tunnel passing through granite contact zone
	Cheng, Yi 1; Zhang, Guo-Hua 2; Jiao, Yu-Yong 1; Wang, Hao 2; Chen, Li-Biao 3
刊名	TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
	2017
卷号	68 页码:174-186
关键词	Tunnel Inrush hazards Granite contact zone Alteration Triggered conditions Mechanism
ISSN号	0886-7798
DOI	10.1016/j.tust.2017.05.008
英文摘要	Triggered by excavation or blasting, the underground water and debris may rush into tunnel like a mudflow, which is the essence of inrush hazards in tunnels. Three conditions are indispensible for the occurrence of inrush hazards, namely, material, space and triggering conditions. This paper introduces the inrush hazards of the Denghuozhai Tunnel, and analyses the mechanism of inrush hazards from aspects of material and space conditions. Studies on the lithofacies, minerals and alteration characteristics reveal that the inrush hazards occurred in the contact zone between geodetic granite and tuff. The types and evolution of the altered rocks are identified which indicates an intrusion of volatile-rich magma into the wall rocks at shallow depth under tensile tectonic environment. Albitized, sericitized and clayinitized alteration thus occurred near the contact zone, leading to the formation of tens of meters wide, loose and deeply-buried soft mineral belts, such as sericite, kaolinite and montorillonite, etc. These altered weak zones provide the materials and space for inrush hazards. It is found from the physical, mechanical and hydrological experiments that a high degree of alteration causes swelling, disintegration and argillization of rock and soil, and thus weakens physical and mechanical properties of rocks. This weakening further lowers the triggering threshold of inrush hazards. Therefore, when tunnel excavation approached the altered weak zone, as the weak zone was not identified and no measures were taken to avoid the accidents, inrush hazards were triggered due to excavation disturbance, stress redistribution, blasting vibrations and groundwater drainage. The experiences from these successful cases will be a valuable references and experiences in the design and construction of similar engineering in the future.
WOS研究方向	Construction & Building Technology ; Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000406988300016
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4120]
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.China Univ Geosci, Fac Engn ; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 3.Fujian Prov Expressway Construct Directorate
推荐引用方式 GB/T 7714	Cheng, Yi,Zhang, Guo-Hua,Jiao, Yu-Yong,et al. On the mechanism of inrush hazards when Denghuozhai Tunnel passing through granite contact zone[J]. TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,2017,68:174-186.
APA	Cheng, Yi,Zhang, Guo-Hua,Jiao, Yu-Yong,Wang, Hao,&Chen, Li-Biao.(2017).On the mechanism of inrush hazards when Denghuozhai Tunnel passing through granite contact zone.TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,68,174-186.
MLA	Cheng, Yi,et al."On the mechanism of inrush hazards when Denghuozhai Tunnel passing through granite contact zone".TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 68(2017):174-186.