Safety Assessment of Ancient Buildings under Adjacent Subway Blasting Construction Based on the Optimized Fuzzy Optimal Method

Table 2

The score criteria of the risk.

	0∼2 (V)	2∼4 (IV)	4∼6 (III)	6∼8 (II)	8∼10 (I)
U11	Stable	Relatively stable	Relatively fragile	Fragile	Extremely fragile
U12	The Old Stone Age	The Neolithic Age	Ancient times		Modern times
U13	National level	Provincial level	City level	County level	Township level
U14	Grotto structure	Brick masonry structure	Masonry-timber structure	Stone structure	Timber structure
U15	Good durability	Relatively good durability	Relatively bad durability	Bad durability	Extremely bad durability
U16	>25 m	20–25 m	15–20 m	10–15 m	<10 m
U17	>100000 m^2	10000–100000 m^2	1000–10000 m^2	100–1000 m^2	<100 m^2
U18	4th level	3rd level		2nd level	1st level
U19	Much larger	Larger	Approximately equal	Less	Much less
U21	Dynamic compaction	Piling	Cars, city trains	Subway	Train
U22	<4 Hz	4-7 Hz	7–110 Hz	10–13 Hz	>13 Hz
U23	Concentrated	Relatively concentrated	Relatively sporadic	Sporadic	Extremely sporadic
U24	Reasonable	Relatively reasonable	Relatively unreasonable	Unreasonable	Extremely unreasonable
U25	1500 m/s	2100–1500 m/s	2900–2100 m/s	5600–2900 m/s	>5600 m/s
U26	Underground		Overground
U27	<100 m	100–400 m	400–700 m	700–1000 m	>1000 m
U31	Strict	Relatively strict	General	Relatively free	Free
U32	Strong	Relatively strong	General	Relatively weak	Weak
U33	Strong	Relatively strong	General	Relatively weak	Weak
U34	Strong	Relatively strong	General	Relatively weak	Weak