研究者詳細 - 中井　健太郎

論文 - 中井　健太郎

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Severe and nonuniform liquefaction damage of reclaimed ground contributed by interference between body waves and stratigraphic irregularity-induced surface waves 査読有り

Nakai, K; Noda, T; Asaoka, A

EARTHQUAKE SPECTRA 40 巻 ( 1 ) 頁： 287 - 313 2024年2月

Tsunami hazard evaluation of river embankment structures incorporating their vulnerability to seismic strong motion 査読有り

Imai K, Nakai K, Hirai T, Noda, T., Arai, N., Iwama, S., Iwase, H. and Baba, T.

Earthquake Spectra 2024年3月

SEISMIC PERFORMANCE EVALUATION OF PFS METHOD BY SOIL-WATER COUPLED FINITE DEFORMATION ANALYSIS 査読有り

Nakai, K; Fujiwara, K; Ogawa, N

22 巻 ( 89 ) 頁： 94 - 99 2022年1月

Effects of Strong Ground Motion with Identical Response Spectra and Different Duration on Pile Support Mechanism and Seismic Resistance of Spherical Gas Holders on Soft Ground 査読有り

Kobayashi, M; Noda, T; Nakai, K; Takaine, T; Asaoka, A

11 巻 ( 23 ) 2021年12月

PROGRESSIVE FAILURE OF UNSATURATED FILL SLOPE CAUSED BY CUMULATIVE DAMAGE UNDER SEEPAGE SURFACE 査読有り国際誌

Murao, H; Nakai, K; Yoshikawa, T; Noda, T

INTERNATIONAL JOURNAL OF GEOMATE 20 巻 ( 78 ) 頁： 1 - 8 2021年2月

本震による傾斜を想定したガスホルダーの余震耐震性の簡易評価手法の提案査読有り

小林実央, 田附英幸, 中井健太郎, 野田利弘

土木学会論文集A2（応用力学） 77 巻 ( 2 ) 頁： 543 - 550 2021年

3-D numerical analysis for partial floating sheet-pile method under liquefaction 査読有り

Fujiwara, K., Ogawa, N. and Nakai, K.

Journal of JSCE 9 巻 ( 1 ) 頁： 138 - 147 2021年

液状化地盤中の電柱の沈下および傾斜の抑制に対するドレーン化工法の適用性検証査読有り

伊藤広和，石丸真，中井健太郎，野田利弘

地盤工学ジャーナル 15 巻 ( 3 ) 頁： 643 - 652 2020年9月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：地盤工学会

2011年東北地方太平洋沖地震の影響により，関東地方でも広範囲に液状化が発生し，多数の電柱が沈下・傾斜の被害を受けた。都市部では電柱は狭小な場所に設置される場合が多いため対策範囲が限られており，また液状化地域だけでも膨大な数量の電柱が施設されているため，安価で簡易な対策工法の開発が望まれている。本研究では排水工法に着目し，砂地盤の液状化時における電柱の沈下・傾斜の抑制を目的として，電柱にドレーン孔を設ける工法を新たに考案した。電柱底部，および電柱底部・地中部側面にドレーン孔を設けた模型を用いて遠心力模型実験を行ったところ，沈下量・傾斜量ともにドレーン化の程度に応じて小さくなり，電柱のドレーン化は液状化地盤の電柱の沈下・傾斜に対して一定の効果があることを実証した。

DOI： https://doi.org/10.3208/jgs.15.643

Scopus

Deformation-failure mechanism of saturated fill slopes due to resonance phenomena based on lg shaking-table tests (vol 55, pg 1668, 2018)

Murao, H; Nakai, K; Noda, T; Yoshikawa, T

CANADIAN GEOTECHNICAL JOURNAL 57 巻 ( 8 ) 頁： 1263 - 1263 2020年8月

浮き型格子状地盤改良による偏心荷重が作用した既設小規模構造物の液状化被害抑制効果査読有り

中谷一貴，森河由紀弘，中井健太郎，前田健一，野田利弘

土木学会論文集 A2(応用力学) 76 巻 ( 2 ) 頁： I_279-I_288 2020年2月

記述言語：日本語掲載種別：研究論文（学術雑誌）

近年，多発している大規模な地震に伴う液状化によって多くの戸建住宅で深刻な被害が発生している．ここで，液状化被害の中でも構造物が傾斜する場合には構造物自体にも重大な損傷が発生するため，構造物が沈下する場合より被害はさらに深刻になる．そこで，本稿では接地圧が偏心し，傾斜被害が発生しやすい模型構造物を対象にした重力場での二次元模型実験や水～土骨格連成有限変形解析から浮き型格子状地盤改良による液状化被害の抑制効果について検討した．検討の結果，側方流動を抑制することを目的とした浮き型格子状地盤改良により，偏心荷重が作用した構造物においても液状化時における沈下被害を大きく抑制可能であることが分かった．一方で，浮き型格子状地盤改良で得られる傾斜被害抑制効果は沈下被害抑制効果ほど大きくないことが確認された．

DOI： https://doi.org/10.2208/jscejam.76.2_I_279

戸建て住宅の液状化被害に及ぼす隣家の影響査読有り

中井健太郎，野田利弘，大庭拓也

土木学会論文集 A2(応用力学) 75 巻 ( 2 ) 頁： I_401-I_410 2020年2月

記述言語：日本語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.2208/jscejam.75.2_I_401

UNDRAINED CYCLIC SHEAR BEHAVIOR OF CLAY UNDER DRASTICALLY CHANGED LOADING RATE

Khan, I; Nakai, K; Noda, T

INTERNATIONAL JOURNAL OF GEOMATE 18 巻 ( 66 ) 頁： 16 - 23 2020年2月

EXPERIMENTAL RESEARCH ON DEVELOPMENT/DIMINISHING OF ANISOTROPY AND ITS EFFECT ON MECHANICAL BEHAVIOR OF CLAY

Khan, I; Nakai, K; Noda, T

INTERNATIONAL JOURNAL OF GEOMATE 18 巻 ( 65 ) 頁： 9 - 14 2020年1月

Quantitative evaluation of PFS (Partial Floating Sheet-pile) Method under liquefaction

Fujiwara, K; Nakai, K; Ogawa, N

GEOTECHNICS FOR SUSTAINABLE INFRASTRUCTURE DEVELOPMENT 62 巻頁： 467 - 472 2020年

NON-CONTACT ESTIMATION OF STRAIN PARAMETER-TRIGGERING LIQUEFACTION

Uy, EES; Noda, T; Nakai, K; Dungca, JR

INTERNATIONAL JOURNAL OF GEOMATE 16 巻 ( 57 ) 頁： 82 - 88 2019年5月

小規模な浮き型格子状地盤改良による既設小規模構造物の液状化被害の低減効果査読有り

森河由紀弘，中井健太郎，中谷一貴，武田裕輔，前田健一，野田利弘

土木学会論文集 A2(応用力学) 75 巻 ( 2 ) 頁： I_329-I_339 2019年

記述言語：日本語掲載種別：研究論文（学術雑誌）

DOI： https://doi.org/10.2208/jscejam.75.2_I_329

MONITORING THE TRIGGERING OF LIQUEFACTION USING IMAGE PROCESSING

Uy Erica Elice Saloma, Noda Toshihiro, Nakai Kentaro, Dungca Jonathan Rivera

INTERNATIONAL JOURNAL OF GEOMATE 15 巻 ( 51 ) 頁： 180-187 2018年11月

Deformation-failure mechanism of saturated fill slopes due to resonance phenomena based on 1g shaking-table tests

Murao, H; Nakai, K; Noda, T; Yoshikawa, T

CANADIAN GEOTECHNICAL JOURNAL 55 巻 ( 11 ) 頁： 1668 - 1681 2018年11月

Seismic assessment of sheet pile reinforcement effect on river embankments constructed on a soft foundation ground including soft estuarine clay

Nakai, K; Noda, T; Kato, K

CANADIAN GEOTECHNICAL JOURNAL 54 巻 ( 10 ) 頁： 1375 - 1396 2017年10月

A 3D soil-water coupled FE analysis of hollow cylinder test concerning non-uniform deformation 査読有り

Xu, B., Nakai, K., Noda, T. and Takaine, T.

Soils and Foundations 53 巻 ( 6 ) 頁： 923-926 2013年12月

軟弱地盤上に設置した仮設構造物の地震時安定性評価と転倒防止対策の一検討査読有り

中井健太郎，野田利弘

地盤工学ジャーナル 5 巻 ( 3 ) 頁： 499-510 2010年9月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

比較的簡単に設置・撤去ができる仮設構造物は，設置期間が短いものの，杭の設置や地盤改良など特段の対策が施されないため，施工・設置中に地震が発生した場合，転倒による人身被害等が懸念される。本論文では，2種類の軟弱地盤（砂質地盤および粘性土地盤）上に建設された仮設構造物の地震時安定性を数値解析的に検討した。その結果，仮設構造物転倒の主たる原因は，単に加速度の増幅（最大加速度）ではなく，①仮設構造物の固有振動数と地盤の卓越振動数の一致に伴う揺れの増幅と，②表層地盤の液状化による支持力低下とそれに伴う構造物の不同沈下にあることがわかった。転倒防止対策としては，仮設構造物の幅と高さを変えることによって，構造物の固有振動数と地盤の卓越周波数を一致させないことも重要であるが，仮設構造物直下に敷設板を用いて構造物と地盤との設置面積を大きくすることが，簡単で効果的な対策となることがわかった.

Seismic response analysis of a coastal artificial reclaimed ground containing a soft layer 査読有り

Noda, T., Nakai, K. and Asaoka, A.

IOP Conference Series: Materials Science and Engineering 10 巻頁： CD, No.012107. 2010年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

The seismic resistance of a coastal artificial ground situated within the Port of Nagoya against the Tokai-Tonankai-Nankai triple-segment earthquake was assessed. The analysis was carried out using the elasto-plastic constitutive equation for soils (SYS-Cam clay model) mounted on the soil-water coupled finite element deformation analysis program The model focuses attention on the action of the soil skeleton structure, and the analysis allows description of the mechanical behavior of a wide range of soils without distinguishing between static and dynamic behavior. When considering earthquake damage, attention usually tends to focus only on the phenomenon of liquefaction in sandy grounds. In this paper, finite element analysis was employed to simulate the phenomenon of liquefaction of soft sand and, in addition, to show that because of disturbance of the soil during the earthquake, there is a danger of large settlement occurring over a long period after the earthquake in the soft clay layer directly beneath the area that is under the action of vertical loads.

部分的に固化改良したゆるい砂地盤の地震時／地震後応答解析査読有り

竹内秀克, 中井健太郎, 野田利弘

応用力学論文集 13 巻 2010年6月

Different failure modes of a clay foundation-embankment system corresponding to different incident seismic waves 査読有り

Nakai, K., Noda, T. and Asaoka, A.

ASCE Geotechnical Special Publication No.201, Soil Dynamics and Earthquake Engineering 頁： 125-130 2010年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In recent years, damage to embankments from earthquakes has been frequently reported. In this paper, the deformation and failure behavior of an embankment constructed on a weak clay foundation during and after an earthquake is investigated using numerical analysis, GEOASIA, assuming a 40 g centrifugal field. The main conclusions obtained were as follows. 1) Although the embankment remained stable without large deformation during the earthquake, a slip plane subsequently penetrated through the embankment, resulting in delayed failure (circular arc slip). 2) The deformation behavior (failure mode) of the foundation and embankment varies greatly depending on the characteristics of the incident seismic motions.

Modeling and seismic response analysis of a reclaimed artificial ground 査読有り

Noda, T., Asaoka, A. and Nakai, K.

ASCE Geotechnical Special Publication No.201, Soil Dynamics and Earthquake Engineering 頁： 294-299 2010年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

Compared with natural grounds formed by sedimentation over many years, reclaimed artificial grounds are often weak. In this work, modeling of a reclaimed offshore artificial ground and its seismic response analysis were carried out, and the vulnerability of the weak reclaimed layers to seismic activity is pointed out. This study was carried out using a soil-water coupled finite deformation analysis program GEOASIA incorporating an elasto-plastic constitutive model (the SYS Cam-clay model). This model is capable of describing, within a single framework, the behaviors of sands, clays, and intermediate soils consisting of sand/clay mixtures through their soil skeleton structures (structure, overconsolidation, anisotropy) and its works. In reclaimed sand, lateral flow and upward lifting of lightweight underground structures occur because of liquefaction during an earthquake. In reclaimed clay, long-term settlement, which continues for several years after the earthquake, occurs.

Seismic stability assessment of a lightweight structure on sandy/clayey foundations 査読有り

Nakai, K. and Noda, T.

Proceedings of the Fourth Japan-China Geotechnical Symposium 頁： 564-571 2010年4月

担当区分：筆頭著者記述言語：英語

For a temporary structure, which is comparatively easy to placement and withdrawal, special countermeasures such as pile penetration or ground improvement are not taken into considerations. As a consequence, when an earthquake occurs during the placement/construction, personal injury might be caused by overturning of the temporary structure. In this paper, co- and post-seismic responses of interactive systems consisting of a temporary structure - alternately layered sandy/clayey foundations were numerically investigated by using a soil-water coupled elasto-plastic finite deformation analysis. The findings are mainly as follows. 1) An unstable structure such as temporary structure become at high risk of overturning by means of liquefaction of sand layer. 2) Although it is possible to consider countermeasure against overturning by widen the breadth and lower the height of the temporary structure, it turned out that installation of a construction board is very effective.

*Structure upgradation concept applied to cyclic mobility of sand and high ductility of natural clay 査読有り

Nakai, K., Noda, T., Nakano, M. Asaoka, A. and Kawai, T.

Proceedings of 17th International Conference on Soil Mechanics and Geotechnical Engineering 頁： 175-178 2009年10月

担当区分：筆頭著者記述言語：英語

Naturally deposited sands/clays are mostly found in structured states. In addition, these are usually in overconsolidated states. Furthermore, they exhibit more or less a condition of anisotropy. In order to describe the mechanical behavior of these natural soils, the authors proposed an elasto-plastic constitutive model, namely Super/subloading yield surface Cam-clay model (E.g. Asaoka et al., 2002), in which three mechanical concepts and their evolution rules were introduced into the Cam-clay model; the first one describes `degradation of soil structure' due to ongoing plastic deformation, the second, `loss of overconsolidation', and the third, `development/loss of anisotropy'. It can be emphasized in the model that, for sand, the degradation of structure proceeds more rapidly than the loss of overconsolidation, while for clay, the loss of overconsolidation proceeds more rapidly than the degradation of soil structure. Thus, the model can describe sand and clay consistently within the same theoretical framework.
For evolution rule of soil structure, most simple one is to consider only the degradation process. But through the exhaustive observation of repeated undrained shear behavior of sand, especially pre and post cyclic mobility behavior, upgradation process of the soil structure can be truly found. So, in the present paper, the process of re-upgradeation for the soil structure due to the plastic volume expansion, i.e. the (positive) dilation, is newly introduced to the model, dividing the contribution of plastic deformation to the change of soil structure into the volumetric and deviatoric part as a sophisticated evolution rule for the soil skeleton structure. And, the importance of upgradation concept of soil skeleton structure can be showned in shear behavior of both sand and clay demonstrating their model responses
1) Sand: Cyclic mobility behavior can be described. Fig.1 shows the calculated result of repeated undrained shear behavior of medium dens

*Co-seismic and post-seismic behavior of an alternately layered sand-clay ground and embankment system accompanied by soil disturbance 査読有り

Noda, T., Takeuchi, H., Nakai, K. and Asaoka, A.

Soils and Foundations 49 巻 ( 5 ) 頁： 739-756 2009年10月

*Numerical simulation of a delayed circular slip failure after the occurrence of the earthquake 査読有り

Nakai, K., Noda, T. and Asaoka, A.

Proceedings of 4th International Workshop on New Frontiers in Computational Geomechanics 頁： 29-32 2008年10月

担当区分：筆頭著者記述言語：英語

By using a soil-water coupled finite element method, deformation/failure behavior during and after the occurrence of an earthquake in a clay foundation-embankment system was numerically examined. The elasto-plastic constitutive model for the soil skeleton is the Super/subloading Yield Surface Cam-clay model. The embankment was calculated as a saturated soil. The results showed that the embankment maintained stability without any significant large deformation during the earthquake, while slip failure penetrating to the crest was suddenly generated a few hours after the earthquake.

Postseismic consolidation settlement of clayey soil due to the coseismic disturbance 査読有り

Noda, T., Takeuchi, H., Nakai, K., Nakano, M. and Asaoka, A.

Proceedings of 4th International Workshop on New Frontiers in Computational Geomechanics 頁： 57-60 2008年10月

*Delayed failure of a clay foundation-embankment system after the occurrence of an earthquake 査読有り

(6) Noda, T., Nakai, K. and Asaoka, A.

Theoretical and applied mechanics JAPAN 57 巻頁： 41-47 2008年

Liquefaction-induced consolidation of embankment soil after earthquake 査読有り

Asaoka, A., Sawada, Y., Noda, T. and Nakai, K.

Proceedings of 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering (13th ARC) 頁： 602-605 2007年12月

Effects of embankment rigidity on behavior of naturally deposited soils during/after earthquakes 査読有り

Noda, T., Asaoka, A, Nakano, M. Nakai, K. and Takeuchi, H.

Proc. of International Workshop on Earthquake Hazards and Mitigations 頁： 23-26 2007年12月

Structural re-upgradation in clay and sand accompanying plastic swelling 査読有り

Noda, T., Asaoka, A. Nakai, K. and Tashiro, M

Proceedings of 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering(13th ARC) 頁： 23-26 2007年12月

Explanation of cyclic mobility of soils: approach by stress-induced anisotropy 査読有り

Zhang, F., Ye, B., Noda, T., Nakano, M. and Nakai, K.

Soils and Foundations 47 巻 ( 4 ) 頁： 635-648 2007年8月

High ductility of structured clay and cyclic mobility of sand 査読有り

Nakai, K., Noda, T., Nakano, M., Tashiro, M. and Asaoka, A

Proc. of 3rd International Workshop on New Frontiers in Computational Geomechanics (IWS-Xian2006) 頁： 183-186 2006年

High ductility of structured clay and cyclic mobility of sand 査読有り

Nakai, K., Noda, T., Nakano, M., Tashiro, M. and Asaoka, A.

Proceedings of 3rd International Workshop on New Frontiers in Computational Geomechanics (IWS-XIAN 2006) 頁： 183-186 2006年

Large compression of soil due to decay of structure during drained repeated shearing 査読有り

Masaki NakanoAkira AsaokaKentaro NakaiMutsumi Tashiro

The 16th International Conference on Soil Mechanics and Geotechnical Engineering,Osaka, Japan. 頁： 929-932 2005年9月

記述言語：英語

Huge volume compression of loose sand can be easily observed not under monotonic loading but under repeated shear stress application with small amplitudes, which is called compaction of sand. Although it takes long time the similar phenomenon is commonly observed even in highly structured natural clay, which has been called, for long years, secondary consolidation/delayed compression of natural clay. This study describes that these large-scaled volume compression observed both in clay and sand is due to the decay/collapse of soil skeleton structure that occurs with on going plastic shear deformation. Distinguishing the mechanical difference between sand and clay, the super/subloading elasto-plastic constitutive model still explains the mechanism of the volume compression of soils consistently.

Densification/compression by compaction of a granular geomaterial changed by crushing dewatered sludge with air 査読有り

Kentaro NakaiMasaki NakanoKazuhiro Kaneda

The 16th International Conference on Soil Mechanics and Geotechnical Engineering,Osaka, Japan. 頁： 2307-2310 2005年9月

担当区分：筆頭著者記述言語：英語

To improve the construction surplus soil and to use the soil as a geomaterial, a densification technology of soil with high water con-tent such as dewatered sludge is studied. The densification is brought by the change from the `consolidation material' like clay to the `compactable material' like sand. The soil is crushed with air to an assembly of clay pebbles, the water content of which is ease to de-crease, and therefore the assembly can be compacted to high density without long consolidation time. The soil became low com-pressible and had high shear resistance, which can be describe by Super/subloading Yield Surface model.

高位構造を有する自然堆積粘土が示す塑性圧縮を伴う軟化挙動査読有り

中井健太郎中野正樹

応用力学論文集 8 巻頁： 451-460 2005年8月

Elasto-plactic Description of Undrained Shear Behavior of Sand Depending on Confining Stress 査読有り

Masaki NakanoToshihiro NodaKentaro NakaiAkira Asaoka

International Symposium on Plasticity 2005, Kauai (Hawaii) 頁： 283-285 2005年1月

Densification of dewatered sludge by compaction after crushing and air-mixing mechanical behaviour of structured clay and simulation 査読有り

Nakano, M., Nakai, K. and Kaneda, K.

ASCE Geotechnical Special Publication No.156, Geomechanics II: Testing Modeling and Simulation 頁： 189-200189-200 2005年

*Simulation of shear and one-dimensional compression behavior of naturally deposited clays by Super/subloading Yield Surface Cam-clay model 査読有り

Masaki NakanoKentaro NakaiToshihiro NodaAkira Asaoka

Soils and Foundations 45 巻 ( 1 ) 頁： 141-151 2005年

記述言語：英語掲載種別：研究論文（学術雑誌）

In the present study, undrained triaxial compression tests and oedometer tests were carried out on two types of naturally deposited undisturbed clay, Pleistocene clay and Holocene clay, and the behaviors of these clays were then simulated using the Super/subloading Yield Surface Cam-clay model (Asaoka, Nakano and Noda, 1998, 2000 and Asaoka et al., 2002), in which the concepts of “structure," overconsolidation, anisotropy, and their evolution laws, are introduced into the modified Cam-clay model. The findings of the present study are as follows:
1) For the two types of undisturbed clay, the Super/subloading Yield Surface Cam-clay model can simulate undrained triaxial compression behaviors ranging from the normally consolidated state to the overconsolidated state, corresponding to various isotropic pressures using a single set of material constants.
2) In addition, the model can simulate one-dimensional compression behaviors using the same material constants as those used for the undrained triaxial compression behavior simulation.
3) Both undrained shear and one-dimensional compression behaviors for the two types of undisturbed clay, that is Pleistocene clay and Holocene clay, which have different loading histories and have undergone different ageing effects, were simulated using the Super/subloading Yield Surface Cam-clay model by changing the evolution parameters.

粘土化のしやすさの異なる第三紀泥岩粉砕砕石集合体の一次元圧縮挙動査読有り

中野正樹中井健太郎

応用力学論文集 7 巻頁： 685-692 2004年8月

Description of “compaction" and “liquefaction" behavior of sand based on evolution of soil skeleton structure 査読有り

Nakai, K, Nakano, M., Noda, T. and Asaoka, A.

Proceedings of 2nd International Workshop on New Frontiers in Computational Geomechanics (IWS-FORTALEZA 2004), 頁： 29-32 2004年

初期構造が第三紀泥岩の粘土化に及ぼす影響査読有り

中野正樹中井健太郎

応用力学論文集 6 巻頁： 419-426 2003年8月

Elasto-Plastic Description of Shear Behavior after Compaction of Loose Sand 査読有り

Masaki NakanoToshihiro NodaEiji YamadaKazuhiro KanedaKentaro Nakai

Proc. 1st Inter. Workshop on New Frontiers in Comp. Geomechanics (IWS- CALGARY 2002), (Eds A. Yashima et al.,) Calgary, Canada. 頁： 27-32 2003年

Compaction behavior of sand with degradation of structure and overconsolidation 査読有り

Nakano, M., Noda, T., Asaoka A. and Nakai, K.

Proc. of Sino-Japanese Symposium on Geotechnical Engineering, Beijing, China 頁： 455-462 2003年

Elasto-plastic Simulation of Compaction Behavior of Loose Sand due to the Decay of Soil Structure 査読有り

Masaki NakanoAkira AsaokaKazuhiro KanedaKentaro Nakai

Proc. of 12th Asian Regional Conf. on Soil Mechanics and Geotechnical Engineering, Leung et al. Singapore. 頁： 505-508 2003年

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<中井 健太郎>

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<中井　健太郎>

論文 - 中井　健太郎