Study on the Safety Evaluation Method of Life-Saving Passage in Building Ruins under the Action of Aftershock

Table 10

The probability percentage P (%) of the secondary collapse of the life-saving passage under aftershocks after the main earthquake within 168 h rescue time.

Main earthquake magnitude	Rescue time
	≤12 H	≤24 H	≤48 H	≤72 H	≤96 H	≤120 H	≤144 H	≤168 H
6.0–6.4	3.87	5.08	6.53	6.98	6.98	7.66	7.81	8.27
6.5–6.9	6.12	7.99	8.66	9.17	10.32	10.32	10.58	10.58
7.0–7.4	17.58	17.58	23.45	28.79	29.81	29.81	32.87	37.71
≥7.5	39.24	60.15	64.73	74.94	74.94	74.94	74.94	74.94