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Prediction of Deformation Behavior of Highly Organic Soil Deposits and Determination of Design Parameters

高有机土沉积物变形行为的预测和设计参数的确定

基本信息

批准号：
02555108
负责人：
MITACHI Toshiyuki
金额：
$ 4.35万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

In order to constuct engineering structures safely on the highly organic soil deposits, it is essntial to predict exact stress-strain behavior of the soil deposits. In Hokkaido area, this kind of problem has been tackled since early years and the analysing method for one-dimensional consolidation settlement and stability calculations have been established in the practicing engineering level. However, the situation where the influence of lateral flow of the soil deposits on the surrounding engineering structures cannot be ignored has recently been caused with the trend of high density land use.In this study, the method of analysis of deformation behavior of highly organic soil deposits and determination of soil parameters for one-dimensional consolidation case and for the case when the lateral soil flow should be taken into account were proposed.(1) One-dimensional consolidation analysis and determination of soil parameters :A new method of prediction for settliment-time relationship of … More soft peaty deposits was proposed in place of ROO<t> hyperbolic curve fitting method which has been used up to the present.Parametes required for this method can be determined with natural water content and consolidation pressure by using the statistical relationships obtained from laboratory test results and field data. For the case of determining soil parameters by laboratory test, it was shown that they can be obtained by short term loading consolidation test or constant rate of strain consolidation test in stead of standard oedometer test. Qualitative relationships between compressibility and composing vegetables of peat were also obtained.(2) Finite element analysis based on the elasto-plastic constitutive model and determination of soil parameters :Four cases of finite element analysis were perromed using the constitutive model developed for cohesive soil and that developed reflecting the mechanical properties of organic soil, and the results were compared with field observation. Method of determination of input soil parametes was also discussed.From a practical point of view, fairly good agreement between calculation and observation was obtaine in spite of crude determination of soil parameters based on the natural water content and field cone penetration test data only. Less

为了在高有机质土层上安全地建设工程结构，准确地预测土层的应力应变特性是十分必要的。在北海道地区，这类问题早在几年前就已开始研究，并在工程实践中建立了一维固结沉降和稳定计算的分析方法。然而，近年来随着高密度土地利用的趋势，土壤沉积物的侧向流动对周围工程结构的影响不容忽视。在本研究中，高有机质沉积土变形特性分析方法及单级土参数的确定三维固结情况和考虑土体侧向流动的情况。(1)一维固结分析与土性参数确定--一种预测地基沉降-时间关系的新方法 ...更多信息本文提出了一种用软泥炭质沉积物代替<t>目前常用的ROO双曲线拟合法的新方法，该方法所需参数可由室内试验结果和现场实测资料的统计关系，用天然含水量和固结压力确定。对于室内试验确定土参数的情况，可以用短期加荷固结试验或恒速率应变固结试验代替标准固结仪试验来确定。同时还得到了泥炭压缩性与其组成植物之间的定性关系。(2)基于弹塑性本构模型的有限元分析及土体参数的确定：采用粘性土和有机质土的本构模型进行了4个算例的有限元分析，并与现场实测结果进行了比较。本文还讨论了输入参数的确定方法，从实际应用的角度看，尽管仅根据天然含水量和现场静力触探试验资料粗略地确定了土参数，但计算值与实测值符合较好。少