丁勇, 施斌, 孙宇, 赵永贵. 2006: 基于BOTDR的白泥井3号隧道拱圈变形监测. 工程地质学报, 14(5): 649-653.
    引用本文: 丁勇, 施斌, 孙宇, 赵永贵. 2006: 基于BOTDR的白泥井3号隧道拱圈变形监测. 工程地质学报, 14(5): 649-653.
    DING Yong, SHI Bin, SUN Yu, ZHAO Yonggui. 2006: MONITORING ON THE ARCH RINGS DEFORMATION IN THE NO.3 TUNNEL OF BAINIJING WITH BOTDR BASED STRAIN MEASUREMENT TECHNIQUE. JOURNAL OF ENGINEERING GEOLOGY, 14(5): 649-653.
    Citation: DING Yong, SHI Bin, SUN Yu, ZHAO Yonggui. 2006: MONITORING ON THE ARCH RINGS DEFORMATION IN THE NO.3 TUNNEL OF BAINIJING WITH BOTDR BASED STRAIN MEASUREMENT TECHNIQUE. JOURNAL OF ENGINEERING GEOLOGY, 14(5): 649-653.

    基于BOTDR的白泥井3号隧道拱圈变形监测

    MONITORING ON THE ARCH RINGS DEFORMATION IN THE NO.3 TUNNEL OF BAINIJING WITH BOTDR BASED STRAIN MEASUREMENT TECHNIQUE

    • 摘要: 白泥井3号隧道是一条山岭隧道,隧道出口段位于滑坡等地质灾害多发的危险区域,为了确保隧道安全,应用国际上先进的BOTDR分布式应变测量技术,对隧道拱圈截面变形进行了分布式应变监测。本文着重介绍了BOTDR在隧道内安装布设以及监测数据的分析过程,监测成果显示,在将近1 a的监测时间里,隧道拱圈基本保持稳定,只是在个别区域,如K84+508.2处拱圈截面的衬砌表面发生张拉变形,变形量在雨季期间达到最大,据分析是由于雨水入渗山体造成围岩压力增大,致使拱圈截面受挤压变形。

       

      Abstract: This paper presents an application case of fiber optic sensor in the Structural Health Monitoring of tunnels.In the No.3 Tunnel of Bainijing in Yunnan Province,BOTDR was applied to monitor the arch rings.According to the geological condition of the tunnel,ten arch rings were selected at the end of the tunnel and fiber optic sensors were installed in them.In the following whole year,the strain distribution of these cross sections was recorded.The monitoring results showed that these ten arch rings retained stable in the monitoring period except the arch ring at the alignment of K84+508.2,where the surface of lining expanded in rainy season.It was believed that the rain infiltrated into the soil and increased the pressure of the adjacent rock mass,and then the arch ring was crushed to deform.

       

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