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Development on high precision articulated shield kinematic model using soil-steel dynamic friction characteristics by ring shear test

基于环剪试验的土-钢动摩擦特性高精度铰接盾构运动模型的建立

基本信息

批准号：
16360217
负责人：
SUGIMOTO Mitsutaka
金额：
$ 9.66万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

1. The articulated shield kinematic model was newly developed, extending the shield kinematic model developed by our group. Furthermore, since it was found that the test site is located in inclined layers in transverse direction against the tunnel alignment, the model was improved so as to consider 3D geological structure.2. The dinamic friction charactersitics between soil/ segment and shield were investigated using the improved ring shear apparatus and the improved direct shear apparatus. Here, roughness of steel surface, enclosures, shear speed and confining stress were taken as test parameters. Through these tests, it was found that it is difficult to get the dinamic friction charactersitics in case of the tests using slurry under high confining stress, since the leakage of slurry appears through the slit of the test apparatus.3. The bending test using the articulated shield, and the mesurement on displacement and deformation of segment were carried out at the site.4. The shield behavior was simulated applying the articulated shield kinematic model considering 3D geological structure to the site test data. As a result, it was confirmed that the newly developed articulated shield kinematic model can simulate the actual shield behavior with high accuracy.5. The back analysis method on the ground properties, such as coefficient of subground reaction and coefficient of earth pressure at rest was developed, based on the shield kinematic model. Applying this method to the site test data, stable results can not be obtained. It is considered that the unknown ground properties have some co-linearity. To overcome this difficulty, it is necessary to select the combination of the unknown ground properties and the equilibrium equations. As a future research, the back analysis on the ground properties using site data will be carried out.

1.对本课题组研制的盾构运动学模型进行了扩展，建立了铰接式盾构运动学模型。此外，由于发现试验点位于隧道走向的横向倾斜层中，因此对模型进行了改进，以考虑三维地质结构。利用改进的环形剪切仪和改进的直剪仪，研究了土体/管片与盾构之间的动态摩擦特性。试验参数包括钢材表面粗糙度、围护结构、剪切速度和围压。通过这些试验发现，在高围压条件下进行泥浆试验时，由于泥浆的渗漏是通过试验装置的缝隙出现的，所以很难得到泥浆的动态摩擦特性。现场进行了铰接式盾构的弯曲试验，并对管片的位移和变形进行了测量。将考虑三维地质结构的铰接式盾构运动学模型应用于现场试验数据，对盾构力学行为进行了模拟。结果表明，新开发的铰接式盾构运动学模型能够较高精度地模拟实际盾构行为。在盾构运动学模型的基础上，提出了地下反力系数、静止土压力系数等地基特性反分析方法。将该方法应用于现场试验数据，不能得到稳定的结果。认为未知的基属性具有一定的共线性。为了克服这一困难，有必要选择未知的地基性质和平衡方程的组合。作为下一步的研究，将利用现场数据对地基性质进行反分析。