Tunnel deformation characteristics based on on-site monitoring data
FANG Qian1,SU Wei1,2,ZHANG Dingli1,YU Fucai1
(1. Tunnel and Underground Engineering Research Center of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;2. China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu,Sichuan 610031,China)
Abstract:The deformation of tunnel is an important parameter indicating the stability of the tunnel. The roof settlement data of 836 tunnels and 806 sets of horizontal convergence data reported from 103 tunnels were collected for statistical analysis. The ground deformation surround the tunnel,the duration of the deformation and their relations with the surrounding rock classification and excavation area were systematically studied. The ground deformation surrounding tunnel was mainly concentrated in the low value zone. With the deterioration of the surrounding rock,the tunnel deformation increases and more deformation data can be observed from the high value zone. With the increase of the tunnel excavation area,the tunnel deformation value increases distinctly. It was noted that there was no obvious relationship between the tunnel deformation and the overburden depth. The duration of the tunnel deformation was mainly concentrated in the low value zone,which increases with the deterioration of the surrounding ground. The magnitudes of tunnel deformation and the lasting time of deformation for different ground types were proposed in the study.
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