Comparative studies are performed by simulating the hypothetical construction schemes of two conventional excavation methods that were proposed for the investigated case.
Many of such problems are affected by selected excavation method.
It affects the selection of excavation method, excavation cycle and rock reinforcement method and time to install rock support.
This research focuses on the selection of excavation method, excavation sequence and optimum trailing distance between different excavation stages in soft ground urban tunnelling.
In order to overcome the disadvantages of conventional excavation technology for repairing and replacing worn-out underground pipes, various trenchless technologies have been developed and tried.
They include multiple-drift excavation method, reduction of advance length, and auxiliary pre-reinforcement support systems.
The Pile-Beam-Arch (PBA) excavation method is widely used in subway station construction for it greatly reduces ground settlement caused by excavation.
These ground conditions are important references for selecting a suitable excavation method, as adopting appropriate excavation methods can reduce risks.
In the conventional excavation, also the CO2 released during rock blasting is factored in.
Therefore, in this study, after investigating different excavation methods in urban areas and comparing conventional and widely used methods in these areas, an appropriate and safe support system was proposed for excavation in urban areas depending on construction, structural and economic conditions.
Roadheader, one of the mechanized excavation equipments, has an exceptional place among the other excavation methods.
