Table 1 Results of correlation calculation and selection of shield tunnelling parameters.

Serial number	Parameter	MIC value	Select	Serial number	Parameter	MIC value	Select
1	Total thrust	0.3	False	12	Advance speed	0.68	True
2	Cutterhead rotational speed	0.57	True	13	Total pressure of thrust cylinders	0.67	True
3	Cutterhead oil pressure	0.42	False	14	Thrust cylinders pressure of upper zone	0.53	True
4	Cutterhead torque	0.44	False	15	Thrust cylinders pressure of lower zone	0.51	True
5	Screw conveyor torque	0.46	False	16	Thrust cylinders pressure of left zone	0.58	True
6	Screw conveyor rotational speed	0.59	True	17	Thrust cylinders pressure of right zone	0.68	True
7	Upper chamber earth pressure	0.63	True	18	Thrust of articulation cylinders	0.21	False
8	Lower chamber earth pressure	0.75	True	19	Slope angle	0.34	False
9	Central chamber earth pressure	0.92	True	20	PR	0.72	True
10	Upper screw conveyor pressure	0.34	False	21	TSR	1	True
11	Lower screw conveyor pressure	0.31	False	22	ATR	0.6	True

ATR ratio of advance rate to total thrust, TSR the ratio of torque to cutter speed, PR penetration rate.

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