Soil-water coupled analysis and experiment on delayed deformation and progressive failure of saturated soils

饱和土延迟变形与渐进破坏的土水耦合分析与试验

• 批准号: 10450177
• 负责人: ASAOKA Akira
• 金额: $ 8.7万
• 依托单位: NAGOYA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450177/
• 关键词: Siol-water coupling; finite deformation analysis; rate effect; Second compression; Progressive failure; Finite element method; 戴荷速度効果; 三軸圧縮試験; クリープ

In this study, both the rate effect of undrained shear behavior for remoulded normally consolidated clay and 'secondary compression/consolidation' for the structured clay were carried out through the experiment and soil-water coupled analysis with superloading Cam-clay model.As for the rate effect of undrained shear behavior, the specimen having rectangular cross-section showed higher order failure mode triggered by initial imperfection and had high undrained strength on rapid loading. On the other hand, the specimen showed lower order failure mode due to mode switching by pore water migration and had low undrained strength.As for secondary compression/delayed compression, under constant load one-dimensionally, the excess pore pressure within the specimen was dissipating during primary consolidation and then, however, the pore pressure generated again due to softening with plastic compression. The pore pressure dissipated again due to plastic hardening from softening and secondary compression occurred.

本研究通过试验和土-水耦合分析，采用超荷剑桥模型，对重塑正常固结粘土不排水剪切特性的速率效应和结构性粘土的“次压缩/固结”特性进行了研究，对于不排水剪切特性的速率效应，具有矩形横截面的试样显示出由初始缺陷触发的高阶破坏模式，并且在快速加载时具有高的不排水强度。对于二次压缩/延迟压缩，在一维恒载作用下，试件内部的超静孔压在主固结过程中消散，但在主固结过程中由于塑性压缩软化而再次产生孔压。孔隙水压力由软化变为塑性硬化，再次消散，出现二次压缩。

项目成果

Asaoka, A.: "Unrained creep rupture of a saturated highly structured soil specimen"Proc. 34ィイD1rdィエD1 Annual conference of JGS. 593-594 (1999)

Asaoka，A.：“饱和高度结构化土壤样本的无雨蠕变破裂”Proc 34D1D1 JGS 593-594 年会（1999 年）。

浅岡顕: "完全排水条件での一次元圧密挙動と地盤の不均質性についての一考察"第34回地盤工学研究発表会講演集(地盤工学会). 2分冊の1. 83-84 (1999)

Akira Asaoka：“完全排水条件下的一维固结行为和土壤异质性的研究”第34届岩土工程研究会议论文集（日本岩土工程学会）2卷1. 83-84（1999）。

Asaoka, Akira: "Delayed compression/consolidation of due to degradation of soil"Soils and Foundations. 40・3. (2000)

Asaoka, Akira：“由于土壤退化导致的延迟压缩/固结”《土壤与基础》（2000 年）。

浅岡顕: "構造を有する粘土供試体の非排水クリープ破壊の数値計算"第34回地盤工学研究発表会講演集(地盤工学会). 2分冊の1. 593-594 (1999)

Akira Asaoka：《结构粘土试件不排水蠕变破坏的数值计算》第 34 届岩土工程研究会议论文集（日本岩土工程学会）第 2 卷 1. 593-594（1999 年）。

Noda, T.: "Delayed failure in soft clay foundation"Soils and Foundations. 40-2. 85-97 (2000)

Noda, T.：“软粘土地基的延迟破坏”土壤和地基。