Measured Analysis on Surface Deformation and Influence of Cutter Torque for Twin Shield Tunnelling in Silty Sand

Table 2

Distribution of loss rate in silt soil region in Hangzhou Metro Line 6.

Soil loss rate	0.2∼0.5		0.5∼0.8		0.8∼1.2		Average value
Range (%)	Number	Proportion (%)	Number	Proportion (%)	Number	Proportion (%)
Former line	9	34.62	5	19.23	0	0.00	0.42
Latter line	6	23.08	3	11.54	3	11.54	0.77
Total	15	57.69	8	30.77	3	11.54	0.6