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

Table 4

Surrounding rock pressure monitoring value of initial support excavation.

Date	Right hance	Left hance	Vault
September 16	0.000	0.000	0.000
September 30th	0.005	0.007	0.445
October 14	0.008	0.081	0.590
October 28	0.035	0.085	0.603
November 11	0.041	0.094	0.623
November 25th	0.045	0.097	0.628
December 9	0.048	0.102	0.647
December 23	0.050	0.105	0.654