Maurice Tutor

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    Phoniex University
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Category > Management Posted 28 Sep 2017 My Price 7.00

Soft ground

I would like to know the most likely method that will be used to construct a 700-800m long twin road tunnel (16mx10m each) of which approximately one third will be in soft ground and the remaining in rock/mixed ground.

Answer: Soft ground is typically excavated using a shield, with or without compressed air depending on the groundwater conditions. Rock is typically excavated either by drilling and blasting or with the use of a tunnel boring machine (TBM). However, if the final cross section shape of the tunnel is not round, as in this case, a TBM will not be efficient and drilling and blasting will more likely be the excavation method of choice.

The problem come when the tunneling operation encounters a transition between soft ground and rock or mixed ground conditions. The choice of excavation method will likely be largely driven by the variability the ground, i.e. how often is a transition likely to be encountered. If the zones of soft ground, rock and mixed ground are extensive and well defined, the contractor may choose to use different excavation methods in each zone. If ground conditions are variable the contractor will likely select the shield excavation method for the whole tunnel and modify the excavation procedure accordingly as rock and mixed ground conditions are encountered

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Maurice Tutor
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Status NEW Posted 28 Sep 2017 10:09 PM My Price 7.00

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