Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel

doi:10.1007/s10064-017-1155-8

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	Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel
	Bian, Kang ; Liu, Jian ; Liu, Zhenping ; Liu, Shangge ; Ai, Fei ; Zheng, Xiaoqing ; Ni, Shaohu ; Zhang, Wei
刊名	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
	2019
卷号	78 期号:1 页码:431-444
关键词	Large deformation Soft rock tunnels Immersion time Microstructure Hydrated-mechanical coupling
ISSN号	1435-9529
DOI	10.1007/s10064-017-1155-8
英文摘要	Typical large-deformation phenomena of soft rock occurred frequently during the tunneling process in Huangjiazhai Tunnel, Hubei Province, China, including extrusion at the tunnel wall and severe damage of the primary support and secondary lining. To reveal the mechanisms of these anomalies, comprehensive investigations have been undertaken combining engineering, laboratory, and microscopic analyses. Since the monitoring results show that there might be a close relationship between the large deformation phenomena and water infiltration into the tunnel, the water-rock interaction is the research focus in the investigations. The experimental results reveal that the deforming resistance and strength of shales exposed at the excavation face weaken quickly in the first 20days after the shales have contact with water. The results obtained by mineral composition detection and microstructure observation illustrate the microscopic reasons for the decreasing strength and deforming resistance of the tunnel surrounding rock after water infiltration. The results from in situ geostress tests indicate that as a result of high tectonic stress and low rock strength, the field of Huangjiazhai Tunnel is an extremely high geostress area. By combining analyses from the mechanical and geological perspectives, there are two main reasons for the large deformations in the Huangjiazhai Tunnel: the plastic flow caused by tunnel excavation under high geostress and low rock strength and a hydrated-mechanical coupling process between the shales and water.
WOS研究方向	Engineering ; Geology
语种	英语
WOS记录号	WOS:000458214600026
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15051]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430072, Hubei, Peoples R China; 2.Power China Huadong Engn Corp Ltd, Hangzhou 310014, Zhejiang, Peoples R China; 3.South China Agr Univ, Coll Water Conservancy & Civil Engn, Guangzhou 510642, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Bian, Kang,Liu, Jian,Liu, Zhenping,et al. Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2019,78(1):431-444.
APA	Bian, Kang.,Liu, Jian.,Liu, Zhenping.,Liu, Shangge.,Ai, Fei.,...&Zhang, Wei.(2019).Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,78(1),431-444.
MLA	Bian, Kang,et al."Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 78.1(2019):431-444.