Progressive failure mechanism of soil structure reinforced by geosynthetics

土工合成材料加筋土结构的渐进破坏机制

• 批准号: 07305054
• 负责人: OHTA Hideki
• 金额: $ 1.6万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07305054/
• 关键词: reinforcement; geosynthetics; test embankment; dilatancy of soil; deformation; strength; 締固め土; 安定解析; 変形解析; 土工; 有限要素法; 一面せん断試験

A full scale test embankment was constructed for the aim of examining the reinforcement mechanism by geosynthetics and the in-situ experiment was carried out for the period from July to October, 1996, in Kanazawa. The test embankment was designed so as to realize a beam shape soil structure reinforced by geosynthetics in one side and an over-hanging slope with 60 degree in another side of the embankment. The deformation of the structure and the strain working on the reinforcement materials installed in the embankment were measured during the experiment. It was found that the confining effect much contributed to the increase of stiffness and strength of soil structure reinforced by geosynthetics. The technique of numerical simulation of mechanical behavior of soil structure reinforced by geosynthetics has been developed. The dilatancy characteristics (particularly positive dilatancy) of soil material must be taken into account in the numerical simulation by finite element computation. The geosynthetics wrapping the soil works so as to prevent the dilation of soil when the shear stress was applied. And, as a result, the effective stress increases and the stiffness and strength of the soil structure are improved. Such mechanism has not yet been taken into consideration in the current design procedure. This task has been still left as a question.

为了研究土工合成材料的加筋机理，于1996年7月至10月在金泽建造了一个足尺试验路堤，并进行了现场试验。试验路堤设计为一侧为土工合成材料加筋的梁状土结构，另一侧为60 °的悬挑边坡。在试验过程中，测量了结构的变形和加筋材料的应变。结果表明，加筋土的围压效应对加筋土结构刚度和强度的提高有很大贡献。发展了土工合成材料加筋土结构力学行为的数值模拟技术。用有限元法进行数值模拟时，必须考虑土材料的粘性特性（特别是正粘性）。土工合成材料包裹土壤的作用是防止土壤在剪应力作用下发生膨胀。有效应力增大，土体结构的刚度和强度得到提高。在目前的设计程序中尚未考虑这种机制。这项任务仍然是个问题。

项目成果

Sami GOREN.,Hideki OHTA: "Performance of test embankment reinforced by Geosynthetics" 第29回土質工学研究発表会. 25-28 (1994)

Sami GOREN.，Hideki OHTA：“土工合成材料加固的测试路堤的性能”第 29 届土壤工程研究报告（1994 年）。

Hideki Ohta et. all.: "Numerical simulation of beam-shaped soil structure reinforced geosymthetics." Earth Reinforcement, Proc. Int. Symp. on Earth Reinforcement. 255-260 (1996)

太田英树等。

森影篤史、太田秀樹他: "締固め土の先行圧縮応力と応力履歴による強度の推定手法の適用性" 土木学会第48回年次学術講演会概要集. 1246-1247 (1993)

Atsushi Morikage、Hideki Ota 等人：“基于压实土的先验压应力和应力历史的强度估算方法的适用性”日本土木工程师学会第 48 届年度学术会议摘要 1246-1247（1993 年）。

Sami GOREN.,Hideki OHTA: "Large Scale Direct Shear Test With Grid Reinforced Empankment; A Record of Observation" 第30回土質工学研究発表会. 37-40 (1995)

Sami GOREN.，Hideki OHTA：“网格加固路堤的大规模直接剪切试验；观察记录”第 30 届土壤工程研究报告（1995 年）。