Research on a safety evaluation system for railway-tunnel structures by fuzzy comprehensive evaluation theory

Long-term health detection of railway-tunnel is the development direction and trend future railway tunnel research. Based on actual engineering a tunnel, this study developed safety evaluation model for structures using fuzzy comprehensive method examined state suitable most structures. The results showed that comprehensively reflected impact various factors, which had strong practicality. were clear, accurate, consistent with practice. When factor index to stress structure, Midas/civil analysis different levels surrounding rock structural vault in tunnels tensile, control-bearing capacity state. calculating range 60° central angle was calculated according tensile capacity. Theoretical formulas center φ0 tension zone derived then verified by experiments numerical analysis.