Optimum geosynthetic-reinforcement effect for unsaturated soil structures and evaluation of quality change with time

非饱和土结构的最佳土工合成材料加筋效果及质量随时间变化的评价

• 批准号: 15560425
• 负责人: IIZUKA Atsushi
• 金额: $ 2.37万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560425/
• 关键词: shear deformation; dilatancy; unsaturated soils; maintenance; soil; water coupled problem; strength; F.E.simulation; 補強効果; 水連成有限要素法

The modeling of the composite soil-geosynthetic structure is presented and the effect of the reinforcement arising from the confining of the deformation of the soil by geosynthetics is descussed. A series of compressive shear tests for compacted sandy soil specimens, wrapped in geosynthetics, is carried out for the purpose of quantitatively examining the effect of the geosynthetic reinforcement arising from the confining of the deformation of compacted soils during shearing. Furthermore, an elasto-plastic modeling for compacted soil and a rational determination procedure for input parameters, needed in the elasto-plastic modeling, are presented. Then, the subloading yielding surface is introduced to the elasto-plastic modeling in order to describe the irreversible deformation characteristics of compacted soil during shearing. Since compacted soil is essentially unsaturated and its mechanical behavior is influenced by the suction working in the compacted soil media, the suction effect is taken into account in estimating of the degree of compaction. Finally, an elasto-plastic finite element simulation is conducted and the geosynthetic-reinforcement effect is presented.

建立了土工合成材料复合结构的模型，讨论了土工合成材料对土体变形的限制所产生的加固作用。为了定量地考察土工合成材料在剪切过程中对压实土变形的限制所产生的土工合成材料加固效果，对包裹在土工合成材料中的压实砂土试样进行了一系列压剪试验。在此基础上，提出了压实土的弹塑性模型和弹塑性模型中输入参数的合理确定方法。然后，为了描述压实土在剪切过程中的不可逆变形特性，将下压屈服面引入到弹塑性模型中。由于压实土本质上是非饱和的，其力学行为受压实土介质中吸力作用的影响，因此在估计压实度时考虑了吸力效应。最后进行了弹塑性有限元模拟，分析了土工合成加筋效应。

项目成果

The role of numerical simulation for geosynthetic reinforced soil structures - from laboratory tests to full scale structures -, GeoAsia2004

土工合成材料加筋土结构数值模拟的作用 - 从实验室测试到全尺寸结构 -，GeoAsia2004

• 发表时间: 2004
• 期刊: Invited Lecture at ISSMGE TC9 Sponsored Session, Proceedings of the 3rd Asian regional Conference on Geosynthetics, Seoul, Korea
• 作者: Iizuka;A.;Hirata;M.;Ohta;H.;Kawai;K.;Yokota;Y.
• 通讯作者: Y.

Kawai, K., et al.: "Suction change of compacted soils during static compaction test"Proc.of 2^<nd> Asian Conference on Unsaturated Soils. 429-434 (2003)

Kawai, K., et al.：“静态压实试验期间压实土壤的吸力变化”Proc.of 2^<nd>亚洲非饱和土会议。

Kim, E., et al.: "Estimation of the consolidated yielding stress of compacted soil considering the effects of suction"Proc.of 2^<nd> Asian Conference on Unsaturated Soils. 271-276 (2003)

Kim, E., et al.：“考虑吸力影响的压实土的固结屈服应力的估计”第二届亚洲非饱和土会议论文集。

Numerical assessment of long term non-uniform settlement of man-made island

人工岛长期不均匀沉降的数值评估

• 发表时间: 2003
• 期刊: Proc.of 13^<th> European Conference on Soil Mechanics and Geotechnical Engineering, Prague Vol.1
• 作者: Iizuka;A.;Kawai;K.;Nishida;H.
• 通讯作者: H.

Iizuka, A., et al.: "Computational soil/water coupled unsaturated soil behavior"Proc.of 2^<nd> Asian Conference on Unsaturated Soils. 299-304 (2003)

Iizuka, A., 等人：“计算土壤/水耦合非饱和土壤行为”Proc.of 2^<nd> 亚洲非饱和土壤会议。