Abstract
This paper presents the development of a liquid pressure based automatic monitoring device of the vertical displacement of oil pipeline that has good applicability to the extreme cold conditions of the permafrost region and is capable of automatic collection and transmission of monitoring data. The effectiveness of the device has been verified using total station measurement method and the results show that the device can intuitively indicate the vertical displacement of the pipe under the harmful influence of frost heaving and thaw settlement. According to the monitoring data, safety evaluation of the pipe during the monitoring period is carried out using stress-based design criteria and strain-based design criteria respectively. The analytic results with stress-based design criteria show that the pipe may be in a dangerous state while the results with strain-based design criteria show that the pipe is in a safe state. The design method with strain-based criteria is complementary to the design method with stress-based criteria. Separate use of either method is not recommended.
Highlights
China-Russia crude oil Mohe-Daqing Pipeline is the first large-diameter oil pipeline laid in the high-cold frozen soil area in China
This paper presents the development of a liquid pressure based automatic monitoring device of the vertical displacement of oil pipeline that has good applicability to the extreme cold conditions of the permafrost region and is capable of automatic collection and transmission of monitoring data
The effectiveness of the device has been verified using total station measurement method and the results show that the device can intuitively indicate the vertical displacement of the pipe under the harmful influence of frost heaving and thaw settlement
Summary
Differential frost heaving and thaw settlement can lead to serious stress concentration on the pipe [2] and endanger pipeline safety. It would be very wasteful to take engineering prevention and control measures on the entirety of the nearly 440 kilometers long section of pipeline that penetrate the frozen soil. It is essential to take effective monitoring methods on the pipe or the frozen soil and determine whether to carry out engineering prevention and control measures according to the monitoring results. After finding out the actual conditions of the cushion layer, the monitoring results of the vertical displacement of the pipe can intuitively indicate the safety status of pipeline and the development of frozen soil hazard
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