Development of new tunneling method using X-ray CT

利用 X 射线 CT 开发新的隧道掘进方法

基本信息

批准号：
17360228
负责人：
OTANI Jun
金额：
$ 9.98万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360228/
关键词：
Tunnel X-ray CT Model test Face failure Auxiliary methods Centrifuge model test Image analysis Direct share

项目摘要

In recent years, mountain tunneling method such as NATM (New Austrian Tunneling Method) has been used for tunnel construction even in the urban area. In Japan where land area is small, it is required that tunnel is constructed into unconsolidated ground or low overburden ground. When excavating a tunnel, tunnel face becomes very unstable due to stress release caused by excavation. It is a main issue to maintain the stability in tunnel face during construction. To create the condition for safe construction, it is necessary that tunnel face is reinforced by auxiliary method. However, failure zone due to tunneling is a behavior in three dimensions and the mechanism of face failure in three dimensions has not been well known yet.The objective of this research is to investigate tunnel face failure in three dimensions and to evaluate the mechanism of the auxiliary method. And finally, the new tunneling method with the auxiliary method is proposed. Here in this study, an Industrial X-ray CT was used in order to investigate the behavior in the soils. And the results of model test were checked with centrifuge modeling test for the purpose of in-situ stress level. Followings are the list of conclusions :1. A new testing system combining model test with X-ray CT was developed ;2. Effect image analysis method for getting proper X-ray image was developed ;3. The mechanism of tunnel face failure was well investigated using the test system developed in this research ;4. A series of centrifuge model tests were conducted for the purpose of checking the behavior of in-situ stress level ;5. One tunneling method was proposed based on the results of this research ;6. The effect of the auxiliary method was well investigated using a new test apparatus, direct shear test with CT scanning ;7. The effect cf the auxiliary method was also investigated with 1G model test and centrifuge test ;8. and finally, all the results obtained here in this research were summarized.

近年来，即使在城市地区也采用NATM（新奥地利隧道法）等山地隧道施工方法进行隧道施工。日本国土面积较小，要求隧道建在松散地面或低覆盖层地面上。隧道开挖时，由于开挖引起的应力释放，隧道面变得非常不稳定。保持掌子面稳定是施工过程中的一个主要问题。为了给安全施工创造条件，必须对掌子面进行辅助加固。然而，隧道开挖引起的破坏区是三维行为，而三维掌子面破坏的机理尚不清楚。本研究的目的是研究三维隧道掌子面破坏并评估三维掌子面破坏的机理。辅助方法。最后，提出了带有辅助方法的新隧道方法。在本研究中，使用工业 X 射线 CT 来研究土壤中的行为。并用离心机模型试验对模型试验结果进行检验，以确定地应力水平。以下是结论： 1．开发了模型试验与X射线CT相结合的新型检测系统；2．开发了获得正确X射线图像的效果图像分析方法；3．利用本研究开发的试验系统，对隧道掌子面破坏机理进行了深入研究；4．为了检查地应力水平的行为，进行了一系列离心机模型试验；5．根据本研究结果提出了一种隧道掘进方法；6．采用新型试验装置——CT扫描直接剪切试验，很好地考察了辅助方法的效果；7．并通过1G模型试验和离心机试验考察了辅助方法的效果；8．最后对本研究取得的所有结果进行了总结。