Abstract:
Chongqing Tongyu tunnel is a key part of 8 HOURS CHONGQING engineering, which has complex geological conditions, such as water, rock blast, methane, hazard gases, high in situ stress, can fully stand for long broad highway tunnel under complex geological conditions. Monitoring measurement of NATM was strictly done in the construction, such as geological description of the work surface, submergence of ground, the axial stress of roof bolt, the sprayed coatings stress, the pressure of steel tunnel liner plate, inner strain of surrounding rock, the stress of after-coating of concrete, which are related to the stability of surrounding rock and the rationality of support. From the feedback of this information, all the work has been proved efficient, the exit part has already advanced 1 500 m safely. The application of monitoring measurement technology in the tunnel construction will be introduced in the paper.
