Faculty Profiles - NODA, Toshihiro

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Estimation method of upward transmitting wave in base considering multidimensional nonlinearities of surface subsoil

Seismic response analysis of a soil structure-ground system by using a soil-water coupled finite deformation analysis code that mounts the combined loading elasto-plastic constitutive model

Reproduction of a seepage model test and discussion on the seepage failure mechanism using soil-water-air coupled finite deformation analysis

Verification of macro-element method on prediction of liquefaction countermeasure effect of excess pore water pressure dissipation method

Full formulation-based Soil-Water Coupled Finite Element Analysis on Undrained Compression Test of Soil Specimen with High Permeability

Numerical realization of surface waves and assessment of their influence on liquefaction damage using soil-water coupled finite deformation analysis

Elucidation of the fill slope failure mechanism due to earthquake with 1G field shaking table test

Effect of non-homogeneity on vibration induced by reverse fault in a ground

Numerical analysis about the influence of ceramic disc permeability on triaxial test results of unsaturated soil

Undrained cyclic shear behavior of clay specimens with different loading rate

サクションの効果を考慮したSYS Cam-clay model による不飽和シルト三軸試験の数値シミュレーション

吉川高広，野田利弘，小高猛司

土木学会第71回年次学術講演会

Event date： 2016.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：東北大学川内北キャンパス Country：Japan

著者らはこれまでに，側圧一定の不飽和シルト三軸試験の数値シミュレーションを行い，弾塑性構成式SYS Cam-clay modelを搭載した空気～水～土骨格連成有限変形解析コードを用いれば，一組の材料定数と初期値により，サクション付与・等方圧密過程およびその後の様々な排水・排気条件下におけるせん断試験結果を概ね再現できることを示した．その一方で，吸水コラプス挙動のように，土骨格の構成式にサクションの効果を考慮しなければ表現できない挙動に関しても確認を行った．本稿では，SYS Cam-clay model に，不飽和化に伴い限界状態線の切片を上昇させるZhang and Ikariyaによる比較的簡単な手法を用いてサクションの効果を導入し，サクション付与・等方圧密過程，およびその後の排気排水，非排気非排水三軸圧縮試験の数値シミュレーションを行った．

本震による不飽和土層の飽和化に起因した余震時の液状化被害拡大に関する解析的考察

野田利弘，吉川高広

土木学会第71回年次学術講演会

Event date： 2016.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：東北大学川内北キャンパス Country：Japan

東日本大震災では，浦安市をはじめとして，東京湾沿岸部の埋立地盤において広範囲に液状化被害が発生した．千葉県では本震に加えて29 分後に大きな余震が襲い，余震時に噴砂などの液状化被害が拡大したことが報告されている．本稿は，弾塑性構成式SYS Cam-clay modelを搭載した空気～水～土骨格連成有限変形解析コードを用いて，余震時に液状化被害が拡大し得ることを，地盤の地下水位が地震により上昇する点に注目して示す．

地層構成が異なる地盤上に建設された防波堤の耐震性評価

中井健太郎，酒井崇之，野田利弘，中島努，長谷川将之

土木学会第71回年次学術講演会

Event date： 2016.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：東北大学川内北キャンパス Country：Japan

南海トラフ巨大地震に備え，既設の防波堤の地震時の変状を予測するとともに，変状に応じた対策が求められている．本報では，愛知県内にある防波堤を対象に地震応答解析を実施し，防波堤の耐震性や地震後の機能維持について検討を行った．解析コードは，砂から中間土，粘土までを同じ理論的枠組で記述する弾塑性構成式（SYS カムクレイモデル）を搭載した水～土骨格連成有限変形解析コードGEOASIAである．

N値ゼロの軟弱層を有する地盤上の岸壁構造物の耐震性に対する2 次元・3 次元照査比較

高稲敏浩，野田利弘，伊勢典央，関一優

土木学会第71回年次学術講演会

Event date： 2016.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：東北大学川内北キャンパス Country：Japan

N値ゼロの軟弱層を持つ地盤上に設置された岸壁構造物の耐震性を、2次元および3 次元の水～土連成有限変形解析により照査し、両者の結果を比較考察した。

Assessment of effective seismic countermeasures for established embankments through numerical analysis

Numerical simulation of a seepage model test and consideration of seepage failure mechanism using soil-water-air coupled finite deformation analysis International conference

u-U-p formulation-based Soil-Water Coupled Finite Deformation Simulation on Plane-Strain Compression Test of Rectangular High-Permeable Soil Specimen

Verification of simulation of the excess pore water pressure dissipation method

Nonaka, T., Yamada, S. and Noda, T.

Event date： 2016.5 - 2016.6

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

In the simulation of the vertical drain method using a soil-water couple finite element analysis, macro-element method can be used as an approximate method to introduce the water absorption and discharge functions of drains into individual elements. Although this method has been applied only to quasi-static problems, the author extends the function of the method and applied it to the soil-water coupled analysis code GEOASIA with inertial term to grasp the countermeasure effect of the excess pore water pressure dissipation method against liquefaction. In this paper, in order to verify the new macro-element method in dynamic problem under plane strain condition, the results of 2-dimentional analysis using the new macro-element method was compared with those of 3-dimentional analysis in which vertical drains were expressed exactly by dividing finite element meshes finely.

Discussion on the seepage failure mechanism by soil-water-air coupled finite deformation analysis

Yoshikawa, T., Noda, T., Kodaka, T. and Cui, Y.

Event date： 2016.5 - 2016.6

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

A soil-water-air coupled finite deformation analysis of a seepage model test was conducted. In the model test, a sand layer with relatively higher permeability is covered with another sand layer with relatively lower permeability directly below the river levee. The analysis can well simulate time and place of the boiling phenomena, which shows the validation of the analysis. Furthermore, from the case studies, it is found that both the difference of the permeability between the layers and the head difference affect the occurrence of boiling and the deformation/failure patterns.

Development and Verification of a Full Formulation-based Soil-Water Coupled Finite Deformation Analysis

Toyoda, T. and Noda, T.

Event date： 2016.5 - 2016.6

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

Soil-water coupled finite deformation analysis has usually been based on u-p formulation, whose set of equations is reduced by assuming 'the relative acceleration of the fluid phase with respect to the solid phase is sufficiently smaller than the acceleration of the solid phase.' In response to the exponential progress of high-performance computation, we developed a sophisticated soil-water coupled finite deformation analysis code on the basis of full-formulation incorporating the exact equations without the assumption. The paper reveals that Full formulation-based code can conduct soil-water coupled analysis takeing dynamic flow of pore water among the saturated soil into consideration.

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