Abstract
Oil and gas pipelines are part of long-distance transportation projects which pass through areas with complex geological conditions and which are prone to geological disasters. Geological disasters significantly affect the safety of pipeline operations. Therefore, it is essential to conduct geological disaster risk assessments in areas along pipelines to ensure efficient pipeline operation, and to provide theoretical support for early warning and forecasting of geological disasters. In this study, the pipeline routes of the Sichuan-Chongqing and Western Hubei management offices of the Sichuan-East Gas Transmission Project were studied. Seven topographic factors—surface elevation, topographic slope, topographic aspect, plane curvature, stratum lithology, rainfall, and vegetation coverage index—were superimposed using the laying method with a total of eight evaluation indicators. The quantitative relationships between the factors and geological disasters were obtained using the geographic information system (GIS) and weight of evidence (WOE). The backpropagation neural network (BP) was optimised using a genetic algorithm (GA) to obtain the weight of each evaluation index. The quantified index was then utilized to identify the geological hazard risk zone along the pipeline. The results showed that the laying method, stratum lithology, and normalised difference vegetation index were the factors influencing hazards.
Highlights
The oil and gas pipelines in China have undergone 17 years of large-scale construction; they were completed and the first west–east gas transmission pipeline was ready for operation in 2014
2100 hidden danger points of geological hazards threatening pipeline safety have been discovered in the main oil and gas pipelines currently in service or under construction, of which 600 landslides accounted for nearly 30% of the hazards [1]
We developed a weight of evidence (WOE)-genetic algorithm (GA)-backpropagation neural network (BP) model to predict the occurrence of geological disasters and prevent the damage to pipelines using the geographic information system (GIS) at the risk site
Summary
The oil and gas pipelines in China have undergone 17 years of large-scale construction; they were completed and the first west–east gas transmission pipeline was ready for operation in 2014. On 2 July 2017, the highway slope of the China–Myanmar natural gas pipeline in Qinglong County, Guizhou province, collapsed and slid due to continuous rainfall which broke the gas pipeline buried along the slope, resulting in gas leakage, a combustion, and an explosion This event resulted in one death, 23 injuries, and the direct economic loss of l. A larger value of Wfi indicates that the promotion effect of the secondary impact factor on the occurrence of landslides is clearer. It passes through the third subsidence zone of the New Cathaysian System and central zone of the Yangtze Quasi-platform It belongs to a subtropical humid monsoon climate zone, characterized by cold winters, hot summers, heavy rains in spring and autumn, high humidity, and abundant rainfall. The landforms along the route are river valleys, hills, and mid-mountain landforms; accompanied 5boyf 1n8umerous geological disasters such as collapses, landslides, and unstable slopes (Figure 3)
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