Monitoring and Early-warning Technology and Application in Pipeline Landslides

Landslide is one of the most serious threats to the shallow-buried pipeline.Monitoring and early-warning is an important measure to control landslide risk.Pipeline landslide monitoring should consider both the hazard and the pipe.More attention should be taken into the monitoring of pipe's longitudinal strain.To completely define the longitudinal strain in the pipeline at one strain gauge station,at least three strain gauges were needed.And the calculation formula was derived from the condition that three gauges were placed in 12 o'clock,3 o'clock and 9 o'clock positions.A method to determine the early-warning threshold value was discussed.An example of pipeline landslide monitoring successfully applied in Yangmu landslide of Lanchengyu product pipeline during the Wenchuan earthquake gave a useful reference to popularize application of monitoring and early-warning.