Deformation Characterisation and Distress Diagnosis of a Metro Shield Tunnel by Adjacent Constructions

Table 3

Crack summation.

	Working conditions	Maximum deformation (mm)	Flattening rate (2 × max)/(d + max)
Normal earth pressure	No reduction in bolt stiffness	2.4	0.8%
	No lateral soil pressure, no reduction in bolt stiffness	6.1	2.3%
	10% reduction in bolt stiffness	2.7	1.0%
	No reduction in bolt stiffness, 100 mm cracking depth on segments	7.1	2.7%
	No reduction in bolt stiffness, 200 mm cracking depth on segments	8.8	3.2%
Earth pressure with 10% reduction	No reduction in bolt stiffness	10	3.4%
	10% reduction in bolt stiffness	46	16.9%
	10% reduction in bolt stiffness, 100 mm cracking depth on segments	54	19.8%
	10% reduction in bolt stiffness, 200 mm cracking depth on segments	69	25.2%