Investigation and Analysis on Crystallization of Tunnel Drainage Pipes in Chongqing

Table 1

Statistics of crystallization surveys on some tunnels under construction in Chongqing.

Projects	Number of locations				Crystallization (%)	Groundwater (%)
	Crystallization	Groundwater	No groundwater	Total
Tunnel between Chongqing North Railway Station and Yulu Station	72	82	10	92	78.3	89.1
Right tunnel between Danzishi Station and Tushan Station	42	48	22	70	60.0	68.6
Left tunnel between Danzishi Station and Tushan Station	28	37	2	39	71.8	94.9
Tunnel between Wutong Road Station and Wulidian Station	60	14	61	75	80.0	18.7
Tunnel between Min’an Avenue Station and Chongqing North Railway Station	8	14	6	20	40.0	70.0
Right tunnel of New Zhongliang Mountain	9	2	8	10	90.0	20.0
Left tunnel of New Zhongliang Mountain	14	14	16	30	46.7	46.7
Total	233	211	125	336	69.3	62.8

Note: all data in Table 1 only reflect the states when the sites were surveying.