Deformation and Damage Mechanism of Tunnel Crossing Fractured Rock Body with Large Surge of Water and Treatment Countermeasures
Tunnel through the fractured rock body construction process is prone to collapse,water and mud surge and other accidents,seriously affecting the safe construction of the tunnel and project progress.Taking the Yakang Expressway Qiandiao Tunnel No.3 as the engineering background,the tunnel deformation and damage mechanism was analyzed through on-site investigation,the key parameters of over-support were determined through numerical calculation,and comprehensive governance measures were proposed.Field test results show that,after the use of surrounding rock deformation treatment measures,the maximum deformation of the arch and the left and right arch waist monitoring points were 134 mm,109 mm and 118 mm,respectively,and the maximum stress value of the steel arch and the secondary lining was 128 kPa and 83 kPa,respectively,which effectively controlled the deformation damage of the tunnel surrounding rock.The results of the study are of great significance to the stability control of the surrounding rock of the tunnel through the fractured rock body.
fractured rock bodytunnellingdeformation damage mechanismcomprehensive control
NETL
NSTL
万方数据
