Table 4 Interaction settings of different part.

From: Study on the impact of partial unloading on the structural deformation of prefabricated segmental subway tunnels

Part

Interaction

Friction coefficient

Reinforcement bar-segment

Embedded

–

Bolt-segment

Embedded

–

Segment-segment

Face-to-face contact

0.5

Bolt-bolt hole

Face-to-face contact

0.1527

Tunnel surface-soil

Face-to-face contact

0.35

Support pile-soil

Face-to-face contact

0.35

Concrete support-support pile

Binding

–

Steel support-support pile

MPC constraints

–