Analysis of tunnel lining vault void and methods of active monitoring and prevention

doi:10.16265/j.cnki.issn1003-3033.2019.S1.033

Abstract

Abstract: In order to avoid lining vault void endangering tunnel structure and driving safety, the causes of vault void were sorted out firstly, and the mechanical effects of lining vault void on tunnel structure were analyzed by using the method of numerical simulation. Secondly, a distributed pressure sensor based on the principle of contact pressure was developed, and a monitoring system was constructed which composed of sensors, extension lines, terminals, gateways and industrial computers. Then, the working flow, management level and sensor layout scheme of active monitoring for lining pouring were proposed. Finally, by checking the monitoring results with the ground penetrating radar in practical projects, the reliability of the monitoring system and method were verified, and the system was applied in multiple railway construction projects. The results show that the causes of lining void are complicated and varied. The vault void can significantly increase the stress and deformation of lining and affect the lining safety. The active monitoring method and system of lining pouring based on distributed compaction sensor can grasp whether the lining vault is compact in real time and avoid the formation of vault void.

Key words: tunnel engineering, lining cavity, mechanical analysis, active monitoring, prevention technology

CLC Number:

X924.3

WU Yimin, SHAO Shuai, FU Helin, LIU Dunli, LIU Changjun, MA Zhe. Analysis of tunnel lining vault void and methods of active monitoring and prevention[J]. China Safety Science Journal, 2019, 29(S1): 186-191.

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