Karst geology and mitigation measures for hazards during metro system construction in Wuhan, China
- PDF / 3,068,241 Bytes
- 23 Pages / 439.37 x 666.142 pts Page_size
- 30 Downloads / 176 Views
Karst geology and mitigation measures for hazards during metro system construction in Wuhan, China Xiuling Wang1 · Jinxing Lai1 · Siyue He1 · Rodney Sheldon Garnes2 · Yuwei Zhang3 Received: 22 October 2018 / Accepted: 6 June 2020 © Springer Nature B.V. 2020
Abstract Karst geology is widely distributed in China; the great differences in natural conditions bring it an array of characteristics in different regions. There is a huge area of the buried karst in Wuhan, exhibiting a unique, but complicated engineering geological environment. This paper summarizes the geological conditions in Wuhan, with special focus on its karst geology. At present, a total of six karst belts have been detected, and they were divided into five structure types. For shield tunnelling in karst region, some problems such as water ingress or mud inrush, partial ground collapse, damage or failure of shield machine, and metro operation and management issues may be raised as a result of the activity of the karst geology. To prevent occurrence of possible hazards, a series of countermeasures suggested for hazard and risk mitigation were discussed in this paper. A case history, where the study section belongs to the Wuhan metro line 6, is referred to evaluate effectiveness of the adopted treatment measures. The feedbacks demonstrated that water ingress was successfully avoided, and ground deformation was effectively controlled in the study section throughout the construction phase. This study can provide significant reference information and experience for metro tunnel constructed in karst region. Keywords Karst geology · Metro tunnel · Geologic hazards · Prevent and countermeasures · Case history
1 Introduction Because of the largest karst distribution area, China is home to some of the rarest types of karst in the world (Huang and Cai 2007; Wang et al. 2004). It is mainly developed in carbonatite region, with an area of about 1.3 million square kilometres, accounting for about * Jinxing Lai [email protected] 1
School of Highway, Chang’an University, Middle of South 2rd Ring Road, Xi’an 710064, Shaan’xi Province, China
2
School of Graduate Studies, University of the West Indies, Cave Hill Campus, Cave Hill, St. Micheal, Barbados
3
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
13
Vol.:(0123456789)
Natural Hazards
13.5% of total land area of China (Wang et al. 2020a). Owing to complexity of control factors and diversity of developmental morphology in karst, it brings a series of difficulties to design and construction in civil engineering (Zini et al. 2015; Song et al. 2020, Liu et al. 2020a, b). A large number of the hazards and incidents caused by adverse impacts of the karst have been recorded when a tunnel passes through the karst region (Alija et al. 2013; Qiu et al. 2020a; Cheng et al. 2020). Thus, to minimize the risk of the geological hazards, many scientific findings are available regarding the aspects of the karst formation mechanism, development regularity, and t
Data Loading...
