Research Article
Stress Performance Evaluation of Shield Machine Cutter Head during Cutting Piles under Masonry Structures
Table 4
Building damage grade evaluation standard.
| Risk level | Maximum slope | Differential settlement (mm/m) | Building distortion (rad/m) | Risk description |
| 1 | <1/500 | <2 | <4 × 10−3 | Ignorable: shallow damage is unlikely | 2 | 1/500∼1/200 | 2∼5 | 4 × 10−3∼1 × 10−2 | Minor: may be damaged in shallow parts, but has no effect on the structure | 3 | 1/200∼1/50 | 5∼20 | 10−2∼4 × 10−2 | Moderate: shallow damage, possible structural damage, possible related rigid pipe damage | 4 | >1/50 | >20 | >4 × 10−2 | Serious: building structure damage, rigid pipeline damage, possible other pipeline damage |
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Note. newly added evaluation annotations by Yang and Zhang [ 24]. |