Sandy aquifer collapse mechanism and accident treatment of the Qingdao metro tunnel

Frontiers in Earth Science

Earth Science

Sijia Liu¹  Zaiquan Wang¹  Liwei Zhang¹  Weiguo Zhang² 

[1] School of Civil Engineering, Qingdao University of Technology, Qingdao, China;null;

关键词: metro tunnel;    water inrush;    collapse mechanism;    grouting reinforcement;    surface settlement;   

DOI  :  10.3389/feart.2023.1293258

 received in 2023-09-12, accepted in 2023-10-04,  发布年份 2023

来源: Frontiers

【 摘 要 】

The tunnel collapse occurred during the construction of the Qingdao Metro Line Ⅰ, resulting in a pit measuring approximately 10 m in diameter and 7 m in depth on the ground surface. The collapse inflicted substantial economic losses, casualties, and subsequent disruptions to ongoing construction activities. To clarify the causes of this collapse and investigate the underlying factors, a comprehensive approach combining field surveys and numerical simulations was undertaken. The results show that the collapse was primarily attributed to inadequate support when facing the challenging geological conditions, poor surrounding rocks (Grade VI) and a high volume of groundwater. The combination of abundant water and sand seeped into the tunnel, culminating in a catastrophic ground collapse. Notably, the arch roof experienced extensive deformation and damage due to the significant seepage pressure, which was exacerbated by the absence of timely support. Then, ground grouting was promptly conducted to repair the affected area and reinforce the tunnel structure. Subsequent monitoring of surface deformations following the resumption of tunneling operations indicated the effectiveness of the disaster treatment approach. These achievements constitute a reliable theoretical foundation for similar projects, particularly in terms of environmental protection and ensuring safe construction practices.

【 授权许可】

Unknown   
Copyright © 2023 Zhang, Wang, Zhang and Liu.