Comprehensive evaluation of loess collapsibility of oil and gas pipeline based on cloud theory

Abstract The comprehensive evaluation of pipeline loess collapsibility risk is a necessary means to control the safety risks pipelines in collapsible section. It also one critical scientific bases for prevention, control, and management. system cloud theory consists quantitative qualitative indexes, has characteristics randomness fuzziness. In view this problem, standard semi-quantitative methods have intense subjectivity dealing with uncertainty problems such as fuzziness system, theory, which can effectively reflect things at same time, introduced. state scale index importance weight collapse are constructed by golden section method. reasoning process indexes expert scoring method proposed. model oil gas established, engineering example analyzed. complete results 10 samples be evaluated consistent compatible actual situation. softens subjective division boundary, simplifies preprocessing data, realizes organic integration decisions, improves accuracy, rationality, visualization results.