Reiknforcement effect arising from confining dilatancy and its evaluation

围限剪胀产生的加固效应及其评价

• 批准号: 12650494
• 负责人: IIZUKA Atsushi
• 金额: $ 2.3万
• 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: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650494/
• 关键词: shear deformation; dilatancy; unsaturated soils; pore water migration; reinforcement effect; strength; F.E. simulation; 土構造物の品質; 補強財,補強効果; 締固め土; 不飽和; せん断・強度特性; ダイレタンシー特性; 初期値・境界値問題; 弾塑性構成モデル; 等価先行圧密圧力; 下負荷面モデル

This research aims at revealing the reinforcement mechanism by geosynthetics. The attention is paid to confining effect by the geosynthetics under shearing. The confining effect is interpreted as the mechanical interaction such that the reinforcement works so as to prevent dilative deformation of compacted soils. The investigators, first, try to explain the geosynthetic-reinforcement mechanism throughout a series of finite element simulations for geosynthetic-reinforced soil structures, in which the soils are modeled as elasto-plastic materials considering dilatancy characteristics of compacted soils. However, in order to heighten the usefulness of such a numerical simulation in the practical design work, the authors realized that the mechanical interaction between soils and reinforcement, that is, the reinforcement mechanism, should be more precisely understood from a viewpoint of mechanical characteristics of soils itself. Then, a series of laboratory tests for compacted (usually unsaturated) sandy soils is carried out. And some model tests in the laboratory are also performed. Compacted soil specimens (30 cm in diameter and 40 cm in height) are wrapped by geosynthetics. The specimens are laid on the uniaxial loading apparatus and are subjected to compressive shear. The extensive stresses working to the geosynthetics are measured during shear.

本研究旨在揭示土工合成材料的加筋机理。考虑了土工合成材料在剪切作用下的围压效应。约束效应被解释为力学相互作用，使加固工程，以防止压实土的膨胀变形。首先，研究人员试图通过一系列土工合成材料加筋土结构的有限元模拟来解释土工合成材料的加筋机理，其中考虑到压实土的粘性特性，将土建模为弹塑性材料。然而，为了提高这种数值模拟在实际设计工作中的有用性，作者认识到，土和钢筋之间的力学相互作用，即，加固机制，应该从土本身的力学特性的观点更准确地理解。然后，对压实（通常为非饱和）桑迪进行了一系列室内试验。并进行了室内模型试验。压实土样（直径30 cm，高度40 cm）由土工合成材料包裹。将试件放置在单轴加载装置上，并进行压缩剪切。在剪切过程中，测量了土工合成材料的广泛应力。

项目成果

森川嘉之: "体積変化を考慮したせん断帯生成理論"土木学会,応用力学論文集. Vol.4. 367-374 (2001)

Yoshiyuki Morikawa：“考虑体积变化的剪切带生成理论”日本土木工程师学会，应用力学杂志第 4 卷（2001 年）。

河井克之: "間隙比を考慮した水分特性曲線モデル"土木学会論文集. No.666/III-53. 291-302 (2000)

Katsuyuki Kawai：“考虑空隙率的湿度特性曲线模型”，日本土木工程师学会会刊第 666/III-53 号（2000 年）。

Pipatpongsa, T., Iizuka, A.,m Kobayashi, I., Ohta, H. and Suzuki, Y.: "Nonlinear analysis for stress-strain-strength of clays using return-mapping algorithms"JSCE, Journal of Applied Mechanicals. Vol.4. 295-306 (2001)

Pipatpongsa, T.、Iizuka, A.、m Kobayashi, I.、Ohta, H. 和 Suzuki, Y.：“使用返回映射算法对粘土的应力-应变-强度进行非线性分析”JSCE，应用机械杂志。

Kawaida, M., Morii, Y., Horikoshi, K., Iizuka, A., Kobayashi, I. and Ohta, H.: "A repair work of a bridge abutment suffering from excessive deformation of soft clay foundation"Proc. of 3^<rd> Regional Symposium on Infrastructure Development in Civil Engin

Kawaida, M.、Morii, Y.、Horikoshi, K.、Iizuka, A.、Kobayashi, I. 和 Ohta, H.：“软粘土地基过度变形桥台的修复工作”Proc。

飯塚敦: "間隙水分布の違いを考慮した不飽和土/水連成解析"土木学会論文集. No659/III-52. 165-178 (2000)

Atsushi Iizuka：“考虑孔隙水分布差异的非饱和土/水相互作用分析”，日本土木工程师学会汇刊 No659/III-52 (2000)。