Abstract：Research purposes:As the subway tunnel is an important infrastructure in the city, safety monitoring during construction will become necessary. In view of the shortcomings of the current segment monitoring, such as security flaws, inefficient judgment lag in data analysis and visualization to synchronization, in this paper we have adopted a set of visual monitoring device, which takes advantage of the vibrating wire sensor technology, to monitor the safety of the lining process during the construction of Wuhan Metro Line Four phase two project of the tunnel, and monitoring includes the steel bar stress of the segment and the strain of concrete in the segment. Using ARIMA modeling to analyze the monitoring results, we have verified the reliability of the visual monitoring device to obtain data. Research conclusions:The visual monitoring device we adopted in the project, which is combined with the vibrating wire sensor technology, has so many advantages, such as high frequency data acquisition, real-time visual surveillance, stable data acquisition and so on. Through ARIMA model analysis of the monitoring data in August, 2013, we have obtained the following conclusions:(1)The time sequence of strain of concrete and the steel bar stress showed a tendency generally, meanwhile there exists fluctuation partially, it is a non-stationary time sequence. (2)The time sequence changes slowly, the monthly change of concrete strain is in the range of 16~20 με, reinforcement stress amplitude is at about 1 kN. (3)After the first order difference, the nonstationary time sequence turns to be stable. (4) The concrete strain time sequence shows the partial correlation significantly, and the reinforcement stress time sequence presents self-correlation as well as partial correlation. (5) The visual monitoring technology mentioned in this paper can monitor structure stress of metro shield tunnel in the complicated environment.
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2014, Vol. 31 
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