Support Measures to Prevent the Deformation and Failure of a Carbonaceous Mudstone Tunnel

Table 4

Test sections.

Section number	Mileage station	Longitudinal connection mode	Lock foot anchor pipe	Notes
1	Zk10 + 340	Rebar connection	Installed	Locking foot anchor pipe parameters: 3.5 m, 35°
2	Zk10 + 350	Channel steel connection	Installed
3	Zk10 + 360	New longitudinal connection system	Installed
4	Zk10 + 370	New longitudinal connection system	Not installed