As for the technology of mechanical excavation has been developed rapidly in two decades, mechanical excavation has a great tendency to increase in constructing tunnels owing to an simple process of construction and modern development of excavation instruments, to faster schedules and to lower costs...
As for the technology of mechanical excavation has been developed rapidly in two decades, mechanical excavation has a great tendency to increase in constructing tunnels owing to an simple process of construction and modern development of excavation instruments, to faster schedules and to lower costs when supported by adequate tunnel planning and preparation. Especially, as a result of rapid development of Shield TBM, the type of Shield TBM became considerably varied, and consequently the application of Shield TBM has been extended to most geological conditions, i.e. poor subsurface conditions such as high water-pressurized condition in deep tunneling and river-bed tunneling, hard rock condition, and mixed face condition as well as good subsurface conditions. However, although the design and performance prediction of Shield TBM are conducted by detailed analysis in consideration of various and complicated design factors acquiring from site investigation, the advance rate of Shield TBM on site is not always in accordance with the predicted value due to the differences between pre-investigation result and real condition of subsurface on site, owing to fluctuation of subsurface condition, i.e. lower of ground water and sudden existence of boulders/gravels/hard rock, and due to the differences of Shield TBM performance by companies. So, in practice, it is unattainable to excavate with the best performance result in all subsurface conditions during excavation and to estimate the construction period precisely. Therefore, in this paper, the attention was drawn to design and select the suitable cutterhead in soil and hard rock conditions considering cutterability, to analyze cycles of the disk-cutter change considering abrasivity, based on practical data acquiring from the site, and to study proper ground stabilization(improvement) methods for the sake of the cutter-tool change and better Shield TBM performance.
As for the technology of mechanical excavation has been developed rapidly in two decades, mechanical excavation has a great tendency to increase in constructing tunnels owing to an simple process of construction and modern development of excavation instruments, to faster schedules and to lower costs when supported by adequate tunnel planning and preparation. Especially, as a result of rapid development of Shield TBM, the type of Shield TBM became considerably varied, and consequently the application of Shield TBM has been extended to most geological conditions, i.e. poor subsurface conditions such as high water-pressurized condition in deep tunneling and river-bed tunneling, hard rock condition, and mixed face condition as well as good subsurface conditions. However, although the design and performance prediction of Shield TBM are conducted by detailed analysis in consideration of various and complicated design factors acquiring from site investigation, the advance rate of Shield TBM on site is not always in accordance with the predicted value due to the differences between pre-investigation result and real condition of subsurface on site, owing to fluctuation of subsurface condition, i.e. lower of ground water and sudden existence of boulders/gravels/hard rock, and due to the differences of Shield TBM performance by companies. So, in practice, it is unattainable to excavate with the best performance result in all subsurface conditions during excavation and to estimate the construction period precisely. Therefore, in this paper, the attention was drawn to design and select the suitable cutterhead in soil and hard rock conditions considering cutterability, to analyze cycles of the disk-cutter change considering abrasivity, based on practical data acquiring from the site, and to study proper ground stabilization(improvement) methods for the sake of the cutter-tool change and better Shield TBM performance.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.