Geological Composition and Structure of the Filling Zone and Its Water-Resisting Property Evaluation on the Top of Ordovician Limestone

Table 1

The water exit conditions of underground drain well.

Borehole	Thickness of Ordovician limestone in exploration (m)	Drilling footage in Ordovician limestone (m)	Water inflow (m^3/h)	Thickness of no water out section (m)
FO2-1a	53.27	11.42	Yielding water	11.42
		53.27	8.16
FO2-1b	52.93	8.92	Yielding water	8.92
		52.93	60.24
FO2-2a	72.06	11.96	Yielding water	11.96
		72.06	64.38
FO2-2c	66.71	10.79	Yielding water	10.79
		66.41	126.31
FO2-3a	99.01	5.70	Yielding water	5.7
		74.9	47.08
FO2-3b	100.29	12.99	Yielding water	12.99
		100.29	48.51
FO2-4a	52.68	19.34	Yielding water	19.34
		20.83	65.83
FO2-4b	77.14	16.50	Yielding water	16.50
		77.14	36.86
FO2-5	50.88	7.06	Yielding water	7.06
		50.88	23.36
FO2-6	50.64	3.38	Yielding water	3.38
		9.45	8.24
		25.57	110.67
		32.18	119.4
		50.64	135
FO2-7	55.82	3.45	1	3.45
		9.01	5.6
		25.43	7.06
		43.8	21
		55.82	175
FO2-10	99.98	9.96	0.2	9.96
		99.98	23.4
FO2-12	99.86	64.58	13	0
		72.79	38.64
		99.86	75.06
FO2-14	2.58	2.58	15.65	0
FO2-16	99.76	43.29	1.9	43.29
		99.76	81
FO2-18	99.16	38.54	27	0
		99.16	82.18
FO2-S2	21.04	1.44	0.01	1.44
		2.54	0.03
		8.20	4.43
		19.20	8.86
		60.84	61.3
		170.01	150