Abstract:

The construction efficiency would be reduced and the cost would be increased due to water burst and mud gushing when the tunnel crosses karst areas or waterrich strata. The construction efficiency reduction of labor and machinery and increasing of construction materials of tunnel construction in waterrich environment are not included in existing norm standards. Investing difficulties will be met due to insufficiency of references during budget estimation compilation. Analysis is made for comparison between data model, material and shift consumption of tunneling in waterrich environment and those of tunneling in normal environment, by taking inclined shaft No. 1 to inclined shaft No. 6 and related main tunnels of XiningGolmud 2nd Line of Guanjiao Tunnel for example. The comprehensive construction efficiency reduction coefficient of labor, machinery and primary support in waterrich environment to that in normal environment is obtained. The rebound amplification of concrete C20 and fiber concrete C25 in waterrich environment to that in normal environment is obtained as well.

Key words: tunnel, waterrich environment, labor, machinery, support, construction efficiency reduction, economic analysis