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Integrated System of Back Analysis for Geotechnical Survey

岩土测量反分析集成系统

基本信息

批准号：
06044096
负责人：
ICHIKAWA Yasuaki
金额：
$ 6.59万
依托单位：
Nagoya Uiversity
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06044096/
关键词：
Geotechnical engineering Inverse analysis Inhomogeneous Dual boundary control カルマンフィルター

项目摘要

In geotechnical engineering, we must estimate the underground state precisely, thus the geological surveying plays an essential role. However, as well-known, the ground materials are inevitably inhomogeneous, and are frequently of nonlinearity. The material properties obtained by conventional in situ tests such as the plate loading test, bore hole pressure test, Lugeon test have been determined on the basis of analytical solutions usually, which cannot take the inhomogeniety of materials, disorder of layrs or irregular shape of boundary, et al.into account. In this sense, the inverse analysis for identifying material properties is of important meaning.Unfortunately the inverse problem is usually ill-posed, so it is difficult to establish a general and accurate method. Ichikawa developed a sufficiently general method based on a dual boundary control concept, and it is applied to the linear elastic problem (Ichikawa and Ohkami 1992), and the viscoelastic problem (Ohkami and Ichikawa 1996).This kind of theoretical concept must be applied to practical engineering problems, so we have developed a three dimensional finite element code which provides a well-designed input-output interface.The members involved in this international project are as follows : Y.Ichikawa, T.Seki, X.Wu (Nagoya University, Japan) ; G.Swoboda (Innsbruck University, Austria) ; G.Gioda, A.Cividini (Technical Univresity of Milano, Italy).

在岩土工程中，必须对地下状态进行准确的估计，地质测量在其中起着至关重要的作用。然而，众所周知，地基材料不可避免地是不均匀的，往往是非线性的。传统的原位试验如平板载荷试验、钻孔压力试验、吕荣试验等，所得到的材料性质通常是根据解析解确定的，不能考虑材料的非均匀性、层位的无序性和边界形状的不规则性等。从这个意义上讲，反分析对于材料性质的识别具有重要意义，但反问题通常是不适定的，因此很难建立一个通用的、精确的方法。Ichikawa基于对偶边界控制的概念发展了一种足够普遍的方法，并将其应用于线弹性问题（Ichikawa和Ohkami 1992），以及粘弹性问题（Ohkami和Ichikawa 1996）。这种理论概念必须应用于实际工程问题，因此，我们开发了一个三维有限元程序，提供了一个设计良好的输入输出接口。参与这项国际项目的成员如下：Y.Ichikawa，T.Seki，X.Wu（日本名古屋大学）; G.Swoboda（奥地利因斯布鲁克大学）; G.Gioda，A.Cividini（意大利米兰理工大学）。