High Speed Railway Environment Safety Evaluation Based on Measurement Attribute Recognition Model

Table 5

High speed railway environment impact assessment index discrimination safety threshold.

Environment	Evaluation Index	Particularly serious	Serious	Medium	Slight	No effect
		Cross wind	(m/s)	>30	25–30	15–25	5–15	0–5
(time)	>3		2-3	1-2	0.5–1.0	0–0.5
Snowfall	(cm)	>30	22–30	17–22	9–17	0–9
Earthquake	(level)	>5.2	4.8–5.2	4.4–4.8	3.9–4.4	0–3.9
	(time)	>1.0	0.6–1.0	0.3–0.6	0.1–0.3	0-0.1
Lightning	(time/km^2)	>55	45–55	30–45	15–30	0–15
Rainfall	(mm)	>2970	1980–2970	900–1980	600–900	0–600
Temperature	(°C)	>64	48–64	35–48	25–35	10–25
	(°C)	<−20	−10–−20	−10–0	0–5	5–10

: average disaster annual wind speed.
: the annual incidence of disasters monsoon.
: annual maximum snow depth.
: the average magnitude level.
: average annual rate of earthquake occurrence.
: annual lightning density.
: annual maximum rainfall.
: average annual maximum temperature.
: average annual minimum temperature.