Table 1 Tunnel support parameters.

From: Optimization of the single-side drift method for shallow-buried tunnels under large eccentric pressure based on the BiDoseResp settlement model

Support name

Size/cm

Profile

Initial support

26

C25 shotcrete

System anchor bolt

350

Hollow bolt with a diameter of 25 mm

Advanced small pipe

450

A42 × 4 mm grouting small pipe

Large pipe shed

3000

A108 × 8 steel pipe

Temporary support steel arch

60 (longitudinal spacing)

I16 steel arch

Internal partition wall

18

C25 shotcrete

Secondary lining

50

C35 reinforced concrete

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