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EVALUATION OF SOFT-GROUND STABILIZATION USING FINITE ELEMENT METHOD BY FEEDBACK ANALYSIS 基于反馈分析的有限元法评价软土地基稳定性
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.23.101
Kazuyoshi Hashimoto, K. Kojima, J. Isono, T. Yonezawa, O. Maruyama
{"title":"EVALUATION OF SOFT-GROUND STABILIZATION USING FINITE ELEMENT METHOD BY FEEDBACK ANALYSIS","authors":"Kazuyoshi Hashimoto, K. Kojima, J. Isono, T. Yonezawa, O. Maruyama","doi":"10.5030/JCIGSJOURNAL.23.101","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.23.101","url":null,"abstract":"九州新幹線熊本車両基地は，熊本平野の極めて軟弱な粘性土が厚く堆積する地盤上に盛土構造で建設中である．当該地は圧密沈下による周辺構造物や地中構造物への影響が懸念されており，その対策としてプレロード工法と気密シートやプラスチックドレーン等のジオシンセティックスを用いた真空圧密工法の2種類の圧密促進工法を採用している．圧密促進工法の採用にあたっては，施工前に試験盛土を実施し，効果の確認を行うとともに，その結果を有限要素法に反映し事前予測を実施している．本研究は，実施工から約1年間にわたる実測データを基に，施工工程等を見直してフィードバック解析を実施し，これまでに検討してきた真空圧密工法のモデル化などの妥当性を検証した．","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"20 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116582817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of Rainfall Infiltration and Compaction Effect on Soil-Geogrid Interaction Behavior 降雨入渗和压实对土-土工格栅相互作用的影响
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.24.61
Jun Zhang, N. Yasufuku
{"title":"Evaluation of Rainfall Infiltration and Compaction Effect on Soil-Geogrid Interaction Behavior","authors":"Jun Zhang, N. Yasufuku","doi":"10.5030/JCIGSJOURNAL.24.61","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.24.61","url":null,"abstract":"The geogrid-reinforced soil structures play important roles in the reinforcement applications since 1980s. Generally in design of the geogrid-reinforced soil structures, the soil-geogrid interaction behavior is not directly considered. Instead, the interaction strength is represented by the consolidation drained strength of soil commonly. However, neglecting the effect of compaction and suction on enhancing soil strength in design possess great conservativeness, leading to the waste in engineering practice. Moreover, along with providing appropriate drainage, the effect of water presence on stability of reinforced soil structures is not specially considered in design. As a result, reinforced soil structures have the possibility to failure caused by rainfall even totally following design code. Therefore, a trend considering the compaction effect and suction influence on the soil structure's behavior has arisen. For such trend, soil-geogrid interaction behavior need to be carefully investigated paying attention to the infiltration to avoid failure due to the rainfall. In this research, improved pullout tests capable of simulating in-suit rainfall infiltration are conducted considering the influence of rainfall infiltration and compaction. In order to survey the infiltration effect on interaction behavior, the pullout behavior of infiltrated soil samples are compared with the pullout behaviors of dry soil sample and soil sample with optimum water content. And the soil samples in pullout test are prepared in different degree of compaction paying attention to the compaction effect. The test results demonstrate that the infiltration dramatically reduces the pullout strength of soil-geogrid interaction. Meanwhile, the compaction could not mitigate the harm of infiltration on the pullout strength although it is able to enhance the peak pullout strength obviously.","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128407212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
DEWATERING AND VOLUME REDUCTION OF SOIL WITH HIGH WATER CONTENT USING VACUUM DEWATERING METHOD WITH GEOTEXTILE TUBE (Part 3) 土工布管真空脱水法对高含水率土的脱水和减容(三)
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.25.259
T. Umezaki, T. Kawamura, Akihiko Okamura, M. Kurata, Tadashi Oodera
{"title":"DEWATERING AND VOLUME REDUCTION OF SOIL WITH HIGH WATER CONTENT USING VACUUM DEWATERING METHOD WITH GEOTEXTILE TUBE (Part 3)","authors":"T. Umezaki, T. Kawamura, Akihiko Okamura, M. Kurata, Tadashi Oodera","doi":"10.5030/JCIGSJOURNAL.25.259","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.25.259","url":null,"abstract":"袋詰脱水法（従来法）に真空圧密を応用した袋詰真空脱水法を提案し，ジオシンセティックス製の脱水袋の内部もしくは外側に簡便な排水層を設置する方法の有効性を示している1)，2)．本文では，山間地や小規模なため池のような狭隘な場所での施工性と脱水効率を向上させるために，積み上げた2つの脱水袋の間に複数枚の排水チューブを取付けたプラスチックボードドレーン3)を挟み込むように敷設するだけの非常に簡単な方法を提案した．屋内および現場における脱水減容化実験を実施し，その有効性を実証した．","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120840412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
GEOGRID REINFORCED SOIL WALL USING FOREST THINNING TO FACING PANEL 土工格栅加筋土墙采用森林间伐来饰面板
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.25.15
K. Kawamura, T. Kotani, Junichiro Kamei, T. Kubo, Takahiro Kanzaki
{"title":"GEOGRID REINFORCED SOIL WALL USING FOREST THINNING TO FACING PANEL","authors":"K. Kawamura, T. Kotani, Junichiro Kamei, T. Kubo, Takahiro Kanzaki","doi":"10.5030/JCIGSJOURNAL.25.15","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.25.15","url":null,"abstract":"気候変動枠組条約第３回締結国会議において，先進国では2008年～2012年の間に温室効果ガスを一定量削減することが決定した．日本では６％削減することが義務付けられ，このうち3.9％を森林整備によって吸収する計画とした．そこで，国および各自治体では、健全な森林の成長を促す間伐作業の推進が図られており、間伐によって発生した間伐材の有効活用が必要とされている．そこで，筆者らは間伐材の有効活用として，補強土壁の壁面材に間伐材を適用した．本論文は，壁面材に間伐材を用いた補強土壁の工法概要と，過去に構築した補強土壁の経年調査について報告するものである．調査は，植生状況，間伐材の腐食状況および補強土壁の安定度について実施した．","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126273597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SHAKING TABLE TEST ON PILE SLAB TRACK OF GEOGRID REINFORCED SOIL EMBANKMENT 土工格栅加筋土路堤桩板轨道振动台试验
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.25.141
Tatsuya Morino, O. Maruyama, T. Yonezawa, H. Aoki, K. Kojima, Hiroaki Sakamoto
{"title":"SHAKING TABLE TEST ON PILE SLAB TRACK OF GEOGRID REINFORCED SOIL EMBANKMENT","authors":"Tatsuya Morino, O. Maruyama, T. Yonezawa, H. Aoki, K. Kojima, Hiroaki Sakamoto","doi":"10.5030/JCIGSJOURNAL.25.141","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.25.141","url":null,"abstract":"新幹線のスラブ軌道用盛土では，耐震性の向上や保守の低減のために許容沈下量や施工方法等に制約が多く，建設コストにも影響を与えている．したがって，より経済的な盛土を構築するには盛土材料の適用性を拡大し，急速施工が可能な工法の開発が必要とされた．そこで，筆者らは比較的細粒分の多い材料など，これまで不適とされる材料に対して，ジオテキスタイルで盛土全体を補強し，かつ盛土内に構築した地盤改良杭がコンクリート路盤を支持することで，地震時も含めて沈下を抑制するパイルスラブ式盛土を開発した．本論文では，パイルスラブ式盛土の各種振動台実験から，地震時の挙動や応答特性，沈下性状等を明らかにし，盛土補強材や地盤改良杭の効果について述べる．","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131835700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimation of long-term creep deformation on geogrids by accelerated test 加速试验估算土工格栅长期蠕变变形
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.24.83
D. Hirakawa, Y. Miyata
{"title":"Estimation of long-term creep deformation on geogrids by accelerated test","authors":"D. Hirakawa, Y. Miyata","doi":"10.5030/JCIGSJOURNAL.24.83","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.24.83","url":null,"abstract":"","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133552856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
現代版土のう工法としてのD·BOX 工法とその局所圧密効果および振動低減効果 作为现代版土农工艺的D·BOX工艺及其局部压密效果及振动降低效果
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.25.19
元 松岡, 春行 山本, 太 野本
{"title":"現代版土のう工法としてのD·BOX 工法とその局所圧密効果および振動低減効果","authors":"元 松岡, 春行 山本, 太 野本","doi":"10.5030/JCIGSJOURNAL.25.19","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.25.19","url":null,"abstract":"D·BOX 工法とは、「土のう」を現代の地盤対策施工技術として活用できるように開発された工法であり、もはや「土のう」と呼べないほど進化しているためD·BOX（Divided Box）と名付けた。ここでは、砕石入りのD·BOX が透水層としても働き、最も強度を必要とする直下の軟弱地盤を局所的に3 次元“圧力球根”状に圧密·強化し、１次元圧密（全面載荷）の場合と比べて短期間に小さい沈下量で収束させる状況を3 次元弾性圧密FE解析結果と沼地でのD·BOX 上の載荷試験結果より説明した。さらに、D·BOX が振動エネルギーを袋に包まれた土粒子間の摩擦熱エネルギーとして消散させる高減衰の減振装置としての機能を果し交通振動を低減させる効果（地震動についても多数の証言有り）について、振動実験結果と最新の道路施工での振動計測事例より示す。","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129294719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
EXAMINATION OF DESIGNING ECO-TUBE WHICH CONSIDERS DEHYDRATION 考虑脱水的生态管设计探讨
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/jcigsjournal.23.265
H. Taninaka, Y. Masuya, I. Takahashi, Naoto Yoshida, Y. Inagaki, H. Kohashi, Akihiko Okamura
{"title":"EXAMINATION OF DESIGNING ECO-TUBE WHICH CONSIDERS DEHYDRATION","authors":"H. Taninaka, Y. Masuya, I. Takahashi, Naoto Yoshida, Y. Inagaki, H. Kohashi, Akihiko Okamura","doi":"10.5030/jcigsjournal.23.265","DOIUrl":"https://doi.org/10.5030/jcigsjournal.23.265","url":null,"abstract":"袋詰脱水処理工法は，河川，湖沼などに堆積している高含水比で軟弱な土を透水性の袋に充填して脱水を促進し，袋の張力を利用して積み重ねて有効利用する工法である．袋体に充填した処理土は，自重圧密による排水や袋表面からの蒸発により含水比が低下する．そのため，脱水後には不飽和状態となることが予想されるが，脱水に関する現状の設計方法では飽和状態と仮定した計算が行われており，妥当性について検証されていない．本論では，処理土内の飽和度の変化を把握し，現行の設計方法の妥当性を検証することを目的として，小型袋を用いた充填実験を行った．ADRを用いた実験結果から，充填後8週間経過後の飽和度は80%程度を示した．この飽和度を用いて脱水量の試算を行ったが実測値と合致せず，蒸散の影響が大きいことが明らかとなった．","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131490403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SHEAR STRAIN DISTRIBUTION IN SOIL AROUND GEOGRID DURING THE UNLOADING-RELOADING PULLOUT TEST 卸载-再加载拉拔试验中土工格栅周围土体的剪切应变分布
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.24.69
Giang .H. Nguyen, J. Kuwano, J. Izawa, S. Seki, S. Tachibana
{"title":"SHEAR STRAIN DISTRIBUTION IN SOIL AROUND GEOGRID DURING THE UNLOADING-RELOADING PULLOUT TEST","authors":"Giang .H. Nguyen, J. Kuwano, J. Izawa, S. Seki, S. Tachibana","doi":"10.5030/JCIGSJOURNAL.24.69","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.24.69","url":null,"abstract":"The soil-geogrid interaction process was analyzed by the Particle Image Velocimetry furthermore spatial discretization scheme in finite element method to understand about the dilatancy mechanism and shear strain distribution during unloading-reloading process. In this test the geogrid was pushed back and forth at three stages of pullout test: before peak, at peak and at residual part to simulate the seismic activities. Results showed that the shear strain concentrated in front of transverse ribs and upper apart of pullout box. The dilative behavior appears in front of transverse ribs and contractive behavior exits at behind of these bars. The alternative soil dilatancy-contraction distribution in between the two transverse ribs can be seen throughout the length of geogrid.","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127321348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
INTERFACE FRICTION CHARACTERISTICS BETWEEN SOIL AND GEOCOMPOSITES FOR LANDFILL CAP COVER 填埋场盖层土与土工复合材料界面摩擦特性
Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal) Pub Date : 1900-01-01 DOI: 10.5030/JCIGSJOURNAL.23.247
Masaki Nishimura, T. Akai, M. Kamon
{"title":"INTERFACE FRICTION CHARACTERISTICS BETWEEN SOIL AND GEOCOMPOSITES FOR LANDFILL CAP COVER","authors":"Masaki Nishimura, T. Akai, M. Kamon","doi":"10.5030/JCIGSJOURNAL.23.247","DOIUrl":"https://doi.org/10.5030/JCIGSJOURNAL.23.247","url":null,"abstract":"廃棄物最終処分場の最終カバー層に用いるキャッピング材料として、遮水性、ガス透過性、施工耐久性を併せ持ったジオシンセティックスが求められている。筆者らはこれまで、多孔質シートと不織布から成るジオコンポジット（GC）について、キャッピング材料としての基本性能を評価してきた。GCを斜面部の最終カバー層に適用するためには、GCの上部に設置される覆土との界面において、すべりに対する安定性が要求される。本研究では、表面状態の異なるGCの土との界面における摩擦特性を評価するとともに、土層の締め固めの影響について検討した。その結果、覆土と接触する不織布の表面状態を改良することで、土との界面における摩擦特性が向上することが明らかになった。また、GCと土との界面の摩擦特性は、土の締め固め条件の影響を受けることがわかった。","PeriodicalId":165094,"journal":{"name":"Jioshinsetikkusu Rombunshu (geosynthetics Engineering Journal)","volume":"229 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130870301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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