A research of failure mechanism of tropical expansion soil in Africa and its countermeasure of symbiosis with nature

非洲热带膨胀土破坏机理及其与自然共生的对策研究

• 批准号: 15404013
• 负责人: YASHIMA Atsushi
• 金额: $ 8.19万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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-15404013/
• 关键词: Marl; differential settlement and swelling; Soil bag; design manual; 泥灰土(marl); 泥炭土; サンプリング

A kind of tropical expansion soil : Marl that widely spread in equatorial area of Africa has a feature of volumetric change in geotechnical field. The volume of Marl increase due to high moisture in rainy season, on the other hand the volume is reduced in dry season. As the weights of lower building do not have bearing resistance against swelling pressure, the deformation caused by shrinkage and expansion invoke differential settling and swelling. From the field investigations around Dakar, factors are investigated based on the type of building, type of damage for building and geological condition. In addition, samples are collected from the major-damaged area in Dakar. In order to understand the physical and mechanical properties and microstructure of Marl, the samples were shipped to Japan and laboratory tests were carried out in Japan. From the results of those tests, the main features of Marl is investigated in detail. As the mechanical feature of Marl changed with water content, l … More aboratory tests were conducted under various water contents. The reduction of strength and the swelling character in high water content condition andtherecovery of strength and swelling character under drainage condition are studied in the research.The practical goal of this research is to establish the construction method to improve the ground stiffness using soil bag in Dakar area. In order to confirm the effectiveness of soil bag as the ground improving method (Solpack-method), various tests using soil bag were conducted. Based on the experimental results, the applicability of Solpack-method is investigated and numerical simulations are carried out in addition. From a series of research, a standard and a manual for design of Solpack-method is proposed and established.In order to apply the Solpack-method in Dakar area, technical meetings are held in Dakar city with engineers of administration, builders, researchers in Dakar area and Professor Fall of Dakar University. Solpack-method, which is established to apply for various local regions in detail, is proposed for researchers and engineers in Dakar area. It is expected to develop the detail manual of design for local area by the researchers in those areas for the future. Less

一种热带膨胀的土壤：在非洲相等地区，巨大的传播具有岩土工具的体积变化的特征。另一方面，由于雨季的水分高，MAL的体积增加，在干旱季节减少了体积。由于下部建筑物的重量没有抵抗肿胀压力的阻力，因此收缩和膨胀引起的变形引起了差分沉降和肿胀。根据达卡尔（Dakar）周围的现场调查，根据建筑物的类型，建筑物的损害类型和地质状况进行了研究。此外，从达卡（Dakar）的重大损害区域收集样品。为了了解MAL的物理和机械性能和微观结构，将样品运送到日本，并在日本进行了实验室测试。根据这些测试的结果，详细研究了MARL的主要特征。随着水含量的机械特征随着水含量的变化而变化，在各种水含量下进行了更多的土著测试。在研究中，研究了在高水含量条件下的强度和肿胀特征，在排水条件下的强度和肿胀特征的发现。这项研究的实际目标是建立施工方法，使用达卡地区的土壤袋改善地面刚度。为了确认土壤袋的有效性作为地面改进方法（Solpack-hethod），使用了使用土壤袋进行各种测试。根据实验结果，研究了Solpack方法的可施加性，并进行了数值模拟。根据一系列的研究，提议并建立了用于Solpack方法设计的标准和手册。为了在达喀尔地区应用Solpack-Method，在达喀尔市举行了技术会议，与达卡地区的工程师，建筑商，研究人员和达喀尔大学的堕落者一起举行了技术会议。 Solpack-Method旨在详细申请各个地方地区，并建议为达喀尔地区的研究人员和工程师。预计将来，研究人员将为未来的研究人员开发当地设计的细节手册。较少的

项目成果

Sarr, A.M.: "Stress-dilatancy relation for highly structured soils"Proc.Of International Workshop on Prediction and Simulation Methods in Geomechanics. 61-64 (2003)

Sarr, A.M.：“高度结构化土壤的应力-剪胀关系”地质力学预测和模拟方法国际研讨会论文集。