The geology of Zheng-Wan railway tunnel is complicated, there are many long tunnels.bad strata.vertical arch sections.auxiliary tunnels, large proportion of karst, high proportion of hard rock, which require higher environmental protection.

IV, V grade surrounding rock accounted for 69.5%, III grade surrounding rock accounted for 28.82% CREG wet shotcreting machine has been unanimously praised by customers with their good performance.

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