Embrittlement Mechanism Analysis of Shield Construction System for Parallel Gas Pipelines Based on Improved DEMATEL-ISM Method

Zheng Liang

doi:10.54097/zkmzcz90

Authors

Zheng Liang

DOI:

https://doi.org/10.54097/zkmzcz90

Keywords:

SCSPGP; Embrittlement factors identification; Embrittlement mechanism analysis; STPA; IPFS-DEMATEL-ISM.

Abstract

To conduct a more accurate and effective embrittlement mechanism analysis of the shield construction system for parallel gas pipelines (SCSPGP), combined with previous accident investigation reports, system-level accidents and hazards were determined, unsafe control behaviors during shield preparation and shield tunneling were identified through building a control feedback model, and a list of embrittlement factors from the four dimensions of physics, psychology, human, and environment was constructed; Considering the uncertainty of human evaluation, the IPFS (Interval Pythagorean Fuzzy Set) was introduced to propose an improved DEMATEL-ISM (the Decision Making Trial and Evaluation Laboratory and the Interpretative Structural Model) method. The method was applied to Zhengzhou Rail Transit Line 12 to identify the key embrittlement factors of SCSPGP and to analyze their hierarchical correlations and influence pathways. The results indicate that the embrittlement factors exhibit a seven-layer and three-order structure, encompassing a total of 40 embrittlement paths, of which safety and technical communication, complex stratigraphy and groundwater emerge as the most fundamental embrittlement factors, while irregular operation and pipeline fatigue play critical roles in the embrittlement process.

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