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.

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 加载中。另一方面，由于模式通过孔隙水的迁移而切换并且强度较低，因此样品显示出较低的阶段故障模式。由于次级压缩/延迟压缩的强度，在一维恒定负载下，样品内的孔隙压力过多，但是在初级固结过程中，孔压力散发出来，但是，由于塑料压缩而导致的孔压力再次产生。由于软化和二次压缩而导致塑料硬化引起的孔隙压力再次散发。

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）。

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: "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）。

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）。

Asaoka, A.: "Superloading yield surface concept for highly structured soil behavior"Soils and Foundations. 40-2. (2000)

Asaoka, A.：“高度结构化土壤行为的超载屈服面概念”土壤和地基。