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Sentinel-1A satellite data is characterized by its broad coverage, rapid revisit periods, and cost-effectiveness, allowing for the efficient acquisition of large-scale surface deformation information along pipelines through interferometric synthetic aperture radar ( InSAR) technology. However, with complex terrain, large topographic relief and lush vegetation, phenomena such as layover, shadow, and incoherence commonly arise during monitoring. The applicability of Sentinel-1A satellite data in different sections of the pipeline is different. To evaluate the applicability of Sentinel-1A data in surface deformation measurements, three pipeline sections in varying mountainous terrains were selected as study areas. Correlation analyses were conducted by combining Sentinel-1A data, Sentinel-2 data, and ALOS DEM data, in order to construct applicability evaluation indexes. The results show that the ratio of layover and shadow regions to the total areas in Sentinel-1A images along the pipelines is significantly negatively correlated with the slope, with Pearson correlation coefficient of - 0. 914 and Spearman correlation coefficient of - 1. Likewise, there was a significant negative correlation between image coherence and normalized vegetation index, with Pearson correlation coefficient of - 0. 972 and Spearman correlation coefficient of - 0. 99. Applicability evaluation indexes for slope and vegetation were established for Sentinel-1A data along pipelines in mountainous areas using the method of regression analysis and normalization, which can evaluate the applicability of Sentinel-1A data for deformation monitoring along the mountainous pipelines. [ABSTRACT FROM AUTHOR]

The Tianshui section of the Zhongwei-Guiyang natural gas pipeline is located on the Loess Plateau, which is characterised by diverse geomorphological types, active tectonics, and complex geological conditions, and a variety of hidden and latent geological hazards. Sentinel-1A ascending and descending satellite data was used to decode and identify landslide hazards along the Tianshui section of the Zhongwei-Guiyang natural gas pipeline based on time-series synthetic aperture radar interferometry (InSAR), field review, development characteristics and typical landslide deformation analysis. A total of 17 landslide hazards were identified in the study area, 13 of which were finally identified in the field review, while the remaining four were areas of human engineering activities, among which the landslide deformation in Changgou and Moyugu villages was affected by rainfall. It is found that most of the landslides along the pipeline in the study area occurs at slopes of 40° ~ 50°, with a height difference of 400 ~ 600 m, within 100 ~ 150 m from the pipeline in the northeastern slope direction, and the geotechnical body is of low strength and the stratigraphy is dominated by Q4 a1+p1. The research results show that the time-series InSAR technology with combined lift and rail can effectively identify landslide hazards along the pipeline, providing an important scientific basis and reference for the safe operation of oil and gas pipelines and future oil and gas pipeline selection. [ABSTRACT FROM AUTHOR]

As one of the typical geological hazard, landslide seriously threatens the safe operation of buried pipelines. If the limit landslide displacement that the pipeline can bear can be accurately predicted, the pipeline failure accident can be effectively predicted combined with advanced landslide monitoring technology. In view of this, firstly, a pipe-soil interaction model with nonlinear contact was established and verified. Then, the effects of model parameters and boundary conditions on simulation results were discussed. Finally, the prediction method of the limit landslide displacement for stress/ strain criterion is researched. The conclusions are as follows. The nonlinear contact pipe-soil interaction model with infinite boundaries on both sides is more suitable for the mechanical response analysis of pipeline under real landslide conditions. Using this model, the large deformation and separation of pipeline and soil can be effective simulated by that model, the limit landslide displacement based on stress and strain criteria can also be predicted. This paper provides an effective technical means for the safety design of pipelines in mountainous areas and the prevention and control of landslide accidents. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)