Development of Assessment System for Ground Water due to Deep Underground Construction
| Project/Area Number |
16560483
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Chiba Institute of Technology |
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Principal Investigator |
KOMIYA Kazuhito Chiba Institute of Technology, Department of Engineering, Professor, 工学部, 教授 (30234884)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Deep ground / Ground water / Pore water pressure / Assessment / Finite element method / 地下空間 / トンネル / 環境影響評価 / 地盤 |
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| Research Abstract |
The shield tunnelling method is frequently applied for constructing underground structures for railways and utility lines in urban areas. The method has been used extensively for more than thirty years and many advances such as the development of new excavation machines and the implementation of computer controlled operation have been made in order to optimise the method. Based on the large amount of experience and expertise, the sources of ground deformation associated with shield tunnelling are well investigated and widely reported. Even with recent advancements of the method, shield tunnelling in deep ground, where pore water pressure is very high, is still a major technical challenge to tunnel engineers. The ground water movement in this type of ground tends to take place more than several months or years after the completion of tunnelling. This long-term ground water movement is mainly originated from the excess pore water pressure generated during the shield tunnelling work as th
… More
e ground is sheared and disturbed.
Because of the complex boundary conditions of a shield tunnelling problem, the use of the finite element method is one of the popular methods to investigate the ground water flow and ground deformation behaviour. In general, the finite element analysis results reported in the literature have contributed greatly in understanding various deformation mechanisms associated with shield tunnelling. However, these past studies are often reported analyses use the in-situ shallow stress condition as the initial condition of the problem without any in-depth consideration of other factors affecting the change in the stress state of the ground. Also the construction process of shield operation is often modelled by applying external forces, introducing traction, or forcing displacements at the boundary nodes of a finite element mesh under a spatially fixed tunnel configuration. In these analyses, the advancement of the shield machine is not modelled. In reality, however, the stress-strain state of the soil changes continuously as the shield machine advances and then passes the spatial point of interest. In order to fully understand the deformation mechanism associated with shield tunnelling, the stress history (or stress path) caused by shield advancement needs to be investigated.
In this study, pore water pressure in deep ground were measured in the field to investigate the short- and long-term pore water pressure change. And the advancement of a shield machine and excavation at the cutting face are modelled, so that the effect of these construction processes on deep ground water movement can be examined. The proposed modelling techniques are used to simulate shield tunnelling construction work through deep ground. The result from the three dimensional coupled soil-pore water analysis was compared to the actual field measurements in order to assess the short- and long-term ground water behaviour in deep ground caused by the shield tunnelling operation. Less
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Report
(3 results)
Research Products
(8 results)
