Deformation of the Zhangjiazhuang high-speed railway tunnel:an analysis of causal mechanisms using geomorphological surveys and D-InSAR monitoring

• 作者: MENG Xing-min QI Tian-jun ZHAO Yan DIJKSTRA Tom SHI Wei LUO Yin-fei WU Yuan-zhao SU Xiao-jun ZHAO Fu-meng MA Jin-hui ZHANG Yi CHEN Guan YUE Dong-xia ZHANG Mao-sheng
• 来源期刊: 山地科学学报（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: Geological Engineering
• 页码范围: 1920-1936
• 页数: 17页
• 语种: 英文

摘要

On 18 January 2016,the Zhangjiazhuang high-speed railway tunnel in Ledu,Qinghai Province,China,underwent serious deformation and structural damage.A crack formed at the top of the tunnel and the concrete on the crown peeled off.As a result,the tunnel could not be operated for three months.In order to determine the types and spatial distribution of the landslides in the region and the surface deformation characteristics associated with the tunnel deformation,we used field geologicaland geomorphological surveys,unmanned aerial vehicle image interpretation and differential interferometric synthetic aperture radar(D-InSAR)surface deformation monitoring.Nine ancient and old landslides were identified and analysed in the study area.Surface deformation monitoring and investigation of buildings in several villages on the slope front showed that the tunnel deformation was not related to deep-seated gravitational slope deformation.However,surface deformation monitoring revealed an active NEE-SWW fault in the area intersecting the tunnel at the location of the tunnel rupture.This constitutes a plausible mechanism for the deformation of the tunnel.Our study highlights the need for detailed engineering geomorphological investigations to better predict the occurrence of tunnel deformation events in the future.