Prediction of Geological Parameters during Tunneling by Time Series Analysis on In Situ Data

Table 1

Basic statistical properties of in situ data used in Tianjin metro line 9.

Parameter	Symbol	Unit	Max	Min	Avg	Std
Advance rate	AR	mm/min	55.68	16.84	35.23	10.04
Thrust force	F	kN	24701.68	10436.07	15840.43	2905.33
Cutter-head torque	T	kNm	1706.28	803.08	1264.49	148.71
Revolution per minute	RPM	rev/min	1.10	0.40	0.94	0.14
Elastic modulus	E	MPa	7.89	4.70	6.57	0.52
Bulk density	ρ	g/cm^3	2.23	1.60	2.10	0.06
Cohesion	C	kPa	32.93	19.84	28.03	2.10
Static earth pressure coefficient	K0	—	0.45	0.32	0.40	0.03
Internal friction angle	φ	°	22.98	14.05	19.53	1.76