Table 2

1 January 2000

Table 1: Inflows greater than 20l/sec in the west side of access tunnel bNote: 1) Water inflow of 200l/sec from a probe hole at BK1+130 burst into the tunnel 35m away. Within the 30m long tunnel, water came from everywhere and there were more than 10 holes with inflows. The maximum inflow at Sta. BK1+137 on 23 September 2004 (Figure 6), reduced to 1000l/sec after 30minutes, 260l/sec after 24 hours, and vanished after the Tunnel A at AK1+270 was excavated. Inflows are related to N55W/70NE fault f1 and the fractured zone that consists of karst denudation, dissolution small cavities connected in a fissure in marble of T2z group. 2) At Sta. BK2+637, inflow started on 20 April 2005. Maximum inflow of about 15.6m3/sec reduced to 240l/sec after 19 days, and vanished after two months. The flow has a large amount of sediment and stopped work for a week. Located in Class I structure surface, Fault f6 influenced the fractured zone that consists of karst denudation, dissolution small cavities connected in a fissure, and a karst cavern of 15m high, 5m wide found in marble of T2z group. 3) Related to fault f9 and its influence zone consisting of six fractured zones of NE orientation. Water burst into the tunnel 45m away, at a pressure of 4MPa, dropping water all along the section with inflows on the south side wall. The fractured zone consists of well developed fissures, karst denudation fissures, openings and karst cavities in marble of T2b group.4) Water bearing structures influence the zone in the hanging wall of fault f11, consisting of tensile fissures and karst cavities in marble rock of T2b group. The fractured zone is connected with the water bearing zone in section AK5+150~+240 in Tunnel A.

					Section length	Initial/Max inflow	Inflow after post grouting	Description of the inflow and hydrogeological conditions
	Date		Station
No.	From	To	From	To	m	l/sec	l/sec
1	2004.09.02		BK1+078	~+164	86	7000	0	(See note 1)
2	2004.11.25	0	BK1+780	~+790	10	25		Fault f2 and its affected zone.
3	2004.12.25	0	BK1+886	~+893	7	30		Fault f3 affected zone.
4	2005.04.20~	5.9	BK2+637	~+690	55	15600		(See note 2)
5	2005.06.17~	19	BK2+930	~+940	10	30
6	2006.02.13		BK4+510	~+520	10	25
7	2006.02.27~	3.08	BK4+610	~+690	80	30		fissure zone width about 2m.
8	2006.03.10	0	BK4+742	~+760	18	30	30
9	2006.03.15~	3.18	BK4+742	~+760	18	300		Fault f7 and its affected zone. In-burst water to tunnel 10m away.
10	2006.04.07~	4.1	BK4+905	~+927	22	150	45	May related to Fault f5. Three blasting holes inflow to 20m away.
11	2006.05.02~	5.09	BK5+071	~+098	27	400	130	(See note 3)
12	2006.05.11~	5.23	BK5+100	~+216	116	200		Fracture zones
13	2006.05.28~	6.06	BK5+223	~+290	67	300	165	Fault f10 and f11 and affected zones.
14	2006.06.08~	6.12	BK5+307	~+346	39	300	115	(See note 4)
15	2006.07.01	0	BK5+431	~+439	8	20	5	Fault f11 affected zone.
16	2006.08.17~	8.22	BK5+768	~+830	62	20	15	Fault f12 and its affected zone.
17	2006.09.16~	9.27	BK5+980~	BK6+090	110	120	30	Fault f12 and its affected zone.
18	2006.10.12	~10.19	BK6+150	~+220	70	40	50
19	2006.10.24~	11.05	BK6+250	~+340	90	280	35	Fault f15 and its affected zone
20	2006.11.05~	11.17	BK6+340	~+400	60	65		Fault f15 and its affected zone
21	2006.11.17~	12.12	BK6+400	~+510	110	450	20	Two faults of NE and one NNW.
Total (steady inflow)				1057	2815	682

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