Table 4.

Analysis of tunnel deformation and rock characteristics.

				Tunnel	Rock type	Observations
6.0	150.0	0.400	26.19	Khara hydroproject	Clay conglomerate	Mild squeezing
4.8	225.0	3.600	1000.00	Maneri stage I	Fractured quartzite	Mild squeezing
4.8	550.0	5.100	1600.00	Maneri-Bhali hydroproject	Foliated metabasics	Severe squeezing
12.0	220.0	0.800	32.89	Maneri-Uttarkashi power	Argillaceous phyllite	Moderate squeezing
13.0	52.0	15.000	16.67	Tehri dam project	Banded schists	Moderate squeezing
3.0	280.0	0.050	9.80	Upper Krishna project	Crushed red shales	Severe squeezing
3.0	280.0	0.022	5.96	Chibro-Khodri tunnel	Soft and plastic black	Severe squeezing