Quantitative Evaluation of the Adaptability of the Shield Machine Based on the Analytic Hierarchy Process (AHP) and Fuzzy Analytic Hierarchy Process (FAHP)

Table 9

Evaluation standard for the evaluation indices.

Scheme layer	Calculation basis	Evaluation standard
		Low degree of adaptability	Moderate degree of adaptability	High degree of adaptability
Existing building (u21)	Based on expert experience	≥20	10∼20	≤10
Underground pipelines (u22)	Based on expert experience	≥10	5∼10	≤5
Propulsion speed (u31)/(mm/min)		≤40 or ≥80	40∼45 or 70∼80	45∼70
Rotation speed of the cutter head (u32)/(r/min)	Based on expert experience	≤0.25 or ≥2.75	0.25∼0.5 or 1.5∼2.75	0.5∼1.5
Grouting pressure (u33)/(MPa)	Based on expert experience	≤0.10 or ≥0.55	0.10∼0.25 or 0.50∼0.55	0.25∼0.50
Total thrust (u41)/kN		≤69520	69520∼81895	≥81895
Main drive torque (u42)/(kN·m)		≤10000	10000∼22350	≥22350
Grouting ability (u43)/(m3/h)	Based on expert experience	≤15	15∼25	≥25
Number of muck improvement openings (u44)/(pcs)	Based on expert experience	≤1	1∼3	≥3
Type of cutting tools (u45)/(pcs)	Based on expert experience	≤1	1∼4	≥4
Slagging quantity of screw conveyor (u46)/(m3/h)		≤350	350∼421	≥421