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、全新开发了铰接式盾构运动模型，扩展了我组开发的盾构运动模型。此外，由于发现试验场地位于与隧道线形横向相反的倾斜层中，因此对模型进行了改进，以考虑3D地质结构。 2．利用改进的环剪装置和改进的直剪装置研究了土壤/管片与盾构之间的动态摩擦特性。这里，以钢材表面粗糙度、外壳、剪切速度和围压作为试验参数。通过这些试验发现，在高围压下使用泥浆进行试验时，由于泥浆的泄漏是通过试验装置的狭缝出现的，因此很难获得动态摩擦特性。 3．现场进行了铰接盾构的弯曲试验，以及管片位移、变形的测量。 4．将考虑 3D 地质结构的铰接式盾构运动学模型应用到现场测试数据中，对盾构行为进行了模拟。结果表明，新开发的铰接式盾构运动学模型能够高精度地模拟盾构的实际行为。 5．基于盾构运动学模型，建立了地下反力系数、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测试数据，无法得到稳定的结果。认为未知的地面特性具有一定的共线性。为了克服这个困难，需要选择未知的地面特性和平衡方程的组合。作为未来的研究，将利用现场数据对地面特性进行反分析。