Improved Protodyakonov’s Method of the Tunnel Surrounding Rock Pressure under the Seepage Condition of Weak Interlayer

Table 3

Weak interlayer with different locations corresponding to the surrounding rock pressure values of left hance and right hance and the vault.

Distance to vault/D	Left hance surrounding rock pressure/MPa	Right hance surrounding rock pressure/MPa	Vault surrounding rock pressure/MPa
0	1.140	0.600	5.640
0.1	0.824	0.361	4.643
0.2	0.641	0.235	4.038
0.3	0.579	0.163	3.730
0.4	0.500	0.140	3.044
0.5	0.464	0.103	2.794