Mechanism of Secondary Lining Cracking and its Simulation for the Dugongling Tunnel
- PDF / 3,812,303 Bytes
- 20 Pages / 595.276 x 790.866 pts Page_size
- 94 Downloads / 193 Views
ORIGINAL PAPER
Mechanism of Secondary Lining Cracking and its Simulation for the Dugongling Tunnel Naifei Liu1,2,3 · Ning Li2 · Chongbang Xu4 · Guofeng Li2 · Zhanping Song1,3 · Min Yang2 Received: 2 December 2019 / Accepted: 17 June 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A large amount of lining cracks, pavement uplift and cable trench overturning occurred during the operation of the Dugongling tunnel, which finally led to the closure of the whole line. The study on the lining cracking mechanism is very important to ensure that the tunnel opens again early. First, the actual cracks of the lining were investigated in the field. According to the geological data, the expansion and softening of the surrounding rock is likely to be the main cause of lining cracking. To verify this inference, a corresponding research program was drawn up. Then, representative sections were selected and the back-analysis method was used to simulate the cracking characteristics of the lining. Based on the simulation results, the cracking mechanisms were studied. The research showed that the increased water content caused the expansion and softening of the surrounding rock, increased the uneven loading on the lining structure, and, finally, led to lining cracking and pavement uplift. Based on the cracking mechanism, progressive enhancement schemes were proposed for each section. The research results of this paper can provide a reference for the design and construction of this project and similar projects. Keywords Highway tunnel · Lining cracking · Pavement uplift · Expansion and softening · Cracking mechanism
1 Introduction Throughout history, as early as the first tunnel built by Chinese people in the Han Dynasty—the Shimen tunnel (EDCJHT 2015)—tunnels have played an important role in water conservancy and hydropower engineering, traffic engineering, industrial and civil engineering, and even military engineering (Hong 2015). Unfortunately, most tunnels suffer from deformation, leakage, or lining cracking to varying degrees during the construction or operation period. Some tunnels even endanger the safety of people during construction period (Liu et al. 2018; Li et al. 2018; Zuo et al. 2016; Zhu and Li 2017; Song et al. 2016a, b; Zhang et al. 2014; * Naifei Liu [email protected] 1
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
2
Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China
3
Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, XAUAT, Xi’an 710055, China
4
Research Center of Bridge and Tunnel, Research Institute of Highway Ministry of Transport, Beijing 100088, China
Shuai 2012; Liu et al. 2011a, b). During the construction of the Kuyu water diversion tunnel in Xinjiang, China, shotcrete cracking and steel arch distortion were caused by repeated water immersion (Liu et al. 2018). Plastic bulging appeared in the early supports near the F510 fault of the Youfangp
Data Loading...
