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

天然粘土储层渗透率普遍存在各向异性。竖向排水改善了软土地基的固结性能，这是影响软土地基固结性能的重要因素。本研究考虑了渗透率的各向异性。进行了竖向排水和径向排水两种固结试验。然后，比较了水平方向和垂直方向的固结系数。对几种重塑原状粘土进行了试验研究。在不同排水条件下的固结试验中，每次试验的初固结所需时间不同。由于两次试验的二次固结效果不同，因此很难对两次试验的固结参数进行比较。采用逆分析方法确定了考虑二次效应的固结参数。整合。试验结果表明，与传统的t^n法相比，该方法能更清晰地计算出竖向a…More与水平固结系数的差值。综上所述，差异并不大，因为水平系数的固结是垂直系数的1-2倍。最后，利用本文提出的逆分析方法对实际软土地基的现场观测数据、沉降和孔隙压力进行了分析。将原位观测资料确定的水平固结系数与原状土样试验结果确定的竖向固结系数进行了比较。土壤参数具有很大的变异性，这种统计特征的建模往往是几种分析的必要条件。本研究考虑了固结参数、体积压缩系数m_v和渗透性系数k的空间变异性。固结参数在整个固结过程中不是恒定的，非线性是影响土体行为的重要因素。提出了同时考虑空间变异和非线性因素的随机非线性固结模型（SNCM）。分析结果表明，在较短的观测周期内得到的沉降和孔隙水压力特性预测是令人满意的。在识别结果中，体积压缩系数m_v保持了较好的先验土试信息，而渗透性系数k则有较大的提高。少

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