Geometric Model for Physical Simulation System of Coal and Gas Outburst

Table 1

Geometric parameters statistical data of more than 100 caverns that occurred during tunnel excavating in Chongqing district [22].

Height (m)	Number (time)	Width (m)	Number (time)	Depth (m)	Number (time)
<2	47	<2	56	<2	39
2∼5	49	2∼4	28	2∼4	42
5∼10	15	4∼6	8	4∼5	13
>10	7	>6	1	5∼6	8
—	—	—	—	>6	15
Total	118		93		117