Table 3 – Summary of support class installed

Details MHT 4 MHT 3B MHT3A MHT2B MHT2A MHT 1
Q-Value Q≤0.4 0.4<Q≤2 0.4<Q≤2 2<Q≤10 2<Q≤10 Q>10
Tunnel length (m) 146 354 620 995 790 2787
% of tunnel length 2.55% 6.19% 10.83% 17.77% 14.0% 48.7%