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Axi-symmetric statistical consolidation model and its application to observational construction procedure on soft grounds

轴对称统计固结模型及其在软土地基观测施工中的应用

基本信息

批准号：
13660242
负责人：
NISHIMURA Shin-ichi
金额：
$ 2.3万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Anisotropy generally exists in the permeability of natural clay deposits. It is an important factor for the consolidation behavior of soft grounds that are improved by vertical drains. In this research, the anisotropy of permeability was considered. Two types of consolidation tests, namely, vertical drainage and radial drainage tests, were conducted. Then, the coefficients of consolidation for the horizontal and the vertical directions were compared. Several kinds of remolded and undisturbed clays were tested. In the consolidation tests under different drainage conditions, the required time far the primary consolidation was different in each test. A comparison of the consolidation parameters in the two tests was difficult, since the effect of the secondary consolidation was different in each test. The inverse analysis method was applied to identify the consolidation parameters considering the secondary. consolidation. According to the test results, the difference between the vertical a … More nd the horizontal coefficients of consolidation was obtained more clearly with the proposed method than with the conventional t^n method. In conclusion, the difference was not so great, since the consolidation of the horizontal coefficients was 1-2 times that of the vertical ones.Finally, the in-situ observation data, settlement and pore pressure in an actual soft ground were analyzed using the proposed inverse analysis method. The horizontal coefficients of consolidation identified from the in-situ observation data were compared wish the vertical coefficients determined from test results of undisturbed soil samples.Soil parameters have great variability and the modeling of such statistical characteristics is often necessary for several kinds of analyses. In this study, a consolidation analysis is carried out considering the spatial variability of parameters, the coefficients of volume compressibility m_v and permeability k. The consolidation parameters are not constant throughout the consolidation process, and the non-Linearity is an important factor in soil behavior. The stochastic nonlinear consolidation model (SNCM), in which both factors, spatial variability and non-linearity are simultaneously considered, was proposed. According to the analytical results, the obtained prediction from relatively short observation period was satisfactory for the settlement and the pore water pressure behavior. In the identification results, the prior information gained through conducted soil tests was maintained relatively well for the coefficient of volume compressibility m_v, while the coefficient of permeability k was improved greatly. Less

天然粘土的渗透性普遍存在各向异性。它是影响排水固结性状的重要因素。在这项研究中，渗透率的各向异性被考虑。进行了两种类型的固结试验，即垂直排水和径向排水试验。然后，对水平方向和垂直方向的固结系数进行了比较。对几种重塑土和原状土进行了试验。在不同排水条件下的固结试验中，各试验达到主固结所需的时间不同。由于次固结的影响在两个试验中是不同的，因此很难对两个试验中的固结参数进行比较。采用反分析方法识别考虑次固结效应的固结参数。合并。根据测试结果，垂直方向和垂直方向之间的差异 ...更多信息与传统的t^n法相比，该方法可以更清晰地获得水平固结系数。结果表明，水平固结系数是垂直固结系数的1-2倍，差异不大。最后，利用本文提出的反分析方法对某软土地基的实测数据、沉降和孔压进行了分析。将由现场观测资料确定的水平固结系数与由原状土样试验结果确定的竖向固结系数进行了比较，土的参数具有很大的变异性，对这种统计特性的建模往往是多种分析所必需的。在本研究中，固结分析考虑了参数的空间变异性，体积压缩系数mv和渗透系数k。固结参数在整个固结过程中不是恒定的，非线性是影响土体性状的重要因素。提出了同时考虑空间变异性和非线性因素的随机非线性固结模型。根据分析结果，从相对较短的观测时间得到的预测沉降和孔隙水压力的行为是令人满意的。在识别结果中，体积压缩系数mv较好地保持了试验所得的先验信息，而渗透系数k则有较大的提高。少