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Development of Assessment System for Ground Water due to Deep Underground Construction

深部地下施工地下水评价系统的开发

基本信息

批准号：
16560483
负责人：
KOMIYA Kazuhito
金额：
$ 1.28万
依托单位：
Chiba Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560483/
关键词：
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

项目摘要

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

盾构法经常应用于城市地区铁路和公用事业线路的地下结构建设。该方法已广泛使用了三十多年，并且为了优化该方法，已经取得了许多进展，例如开发新型挖掘机和实施计算机控制操作。基于大量的经验和专业知识，与盾构隧道相关的地面变形来源得到了深入的研究和广泛的报道。即使该方法最近取得了进展，在孔隙水压力非常高的深层地下盾构施工仍然是隧道工程师面临的重大技术挑战。此类地面中的地下水运动往往会在隧道施工完成后数月或数年内发生。这种长期的地下水运动主要源于盾构隧道施工过程中，由于地面受到剪切和扰动而产生的超孔隙水压力。由于盾构隧道问题的边界条件复杂，使用有限元方法是研究地下水流和地面变形行为的流行方法之一。一般来说，文献中报道的有限元分析结果对于理解与盾构隧道相关的各种变形机制有很大贡献。然而，以往的这些研究往往以地表浅应力条件作为问题的初始条件进行分析，而没有深入考虑影响地基应力状态变化的其他因素。此外，盾构作业的施工过程通常通过在空间固定的隧道配置下施加外力、引入牵引力或在有限元网格的边界节点处强制位移来建模。在这些分析中，没有对盾构机的进步进行建模。但实际上，随着盾构机前进并通过空间兴趣点，土体的应力应变状态不断变化。为了充分了解盾构隧道的变形机制，需要研究盾构推进引起的应力历史（或应力路径）。本研究通过现场测量深层地下孔隙水压力来研究短期和长期孔隙水压力变化。并对盾构机的推进和切削面开挖进行建模，以便检查这些施工过程对深层地下水运动的影响。所提出的建模技术用于模拟穿越深层地面的盾构隧道施工作业。将三维耦合土壤-孔隙水分析的结果与实际现场测量结果进行比较，以评估盾构隧道施工引起的深层地下水的短期和长期行为。较少的