{"title":"A simple method for evaluation of jointed rock slope stability using slide surface approximated by piecewise linear","authors":"Taketomi Sumi, K. Sawada, A. Yashima","doi":"10.3208/JGS.6.261","DOIUrl":"https://doi.org/10.3208/JGS.6.261","url":null,"abstract":"き裂性岩盤斜面の簡易な二次元安定解析手法を提案する。この手法は，すべり面を区分線形近似し，き裂の分布状況に応じてすべり面の一部をき裂に割り当てるものである。これにより，不規則形状のすべり面や岩盤実質部とき裂の両方を通るすべり面を探索することが可能となった。提案手法を用いて仮想斜面や実斜面で安定解析を実施したところ，繰り返し円弧法や試行くさび法より安全率の小さいすべり面経路を探索することができ，実務への有用性を確認できた。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"48 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":"129547108","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}
{"title":"F.E analysis of peaty soft ground under embankment loading followed by vacuum preconsolidation","authors":"Nobutaka Yamazoe, T. Mitachi","doi":"10.3208/JGS.1.143","DOIUrl":"https://doi.org/10.3208/JGS.1.143","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"1 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":"130563053","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}
T. Kodaka, Y. Teramoto, Toshio Hirate, Yasuhisa Motoyama
Compacted bentonite is planned for use as a buffer material in the geological disposal of the high-level radioactive waste. In this paper, in order to study the failure behavior of the compacted bentonite, a series of constant volume direct shear tests were performed. Developed shear bands were observed during the direct shearing using the PIV image analysis. Also, inside of the specimens were observed by using µ -focus X-ray CT scanner. Even though the process of shear bands formation in the unsaturated over-consolidated specimen was different from the process in unsaturated normally consolidated specimen, the low density region due to the shear failure was hardly observed in the center of both specimens under the relative high vertical stress condition. In the case of saturated specimens, there was no change of density at the shear band, and also, it has been confirmed that sealing performance does not change after development of shear bands.
{"title":"Performance evaluation of compacted bentonite buffer material at shear failure","authors":"T. Kodaka, Y. Teramoto, Toshio Hirate, Yasuhisa Motoyama","doi":"10.3208/JGS.5.207","DOIUrl":"https://doi.org/10.3208/JGS.5.207","url":null,"abstract":"Compacted bentonite is planned for use as a buffer material in the geological disposal of the high-level radioactive waste. In this paper, in order to study the failure behavior of the compacted bentonite, a series of constant volume direct shear tests were performed. Developed shear bands were observed during the direct shearing using the PIV image analysis. Also, inside of the specimens were observed by using µ -focus X-ray CT scanner. Even though the process of shear bands formation in the unsaturated over-consolidated specimen was different from the process in unsaturated normally consolidated specimen, the low density region due to the shear failure was hardly observed in the center of both specimens under the relative high vertical stress condition. In the case of saturated specimens, there was no change of density at the shear band, and also, it has been confirmed that sealing performance does not change after development of shear bands.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"47 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":"132411211","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}
Tsuyoshi Yamamoto, T. Nakai, Y. Maruki, T. Kodaka, K. Kishida, Y. Ohnishi
{"title":"Health assessment of the slopes along the roads introducing the long-term degradation concept","authors":"Tsuyoshi Yamamoto, T. Nakai, Y. Maruki, T. Kodaka, K. Kishida, Y. Ohnishi","doi":"10.3208/JGS.4.21","DOIUrl":"https://doi.org/10.3208/JGS.4.21","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"56 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131958395","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}
{"title":"Centrifuge model test on dynamic behavior of multi arch culverts embankment","authors":"Yasuo Sawamur, K. Kishida, M. Kimura, T. Kodaka","doi":"10.3208/JGS.6.201","DOIUrl":"https://doi.org/10.3208/JGS.6.201","url":null,"abstract":"多ユニットアーチカルバート盛土は，盛土内に複数のカルバート構造が挿入された盛土で，地震時における盛土地盤とカルバート構造の相互作用を検証し，耐震性について検討する必要がある。耐震性に関するこれまでの研究は，数値解析を用いたものが主であり，実験による検討は行われてこなかった。本研究では，連続するアーチカルバートの設置間隔（ユニット間隔）に注目し，地震時にユニット間隔がアーチカルバートおよび周辺地盤に与える影響を明らかにすることを目的として，動的遠心模型実験を実施した。実験結果より，ユニット間隔がアーチカルバートの高さの1/2までであれば，アーチカルバートや周辺地盤の挙動が大きく変化することはないことが確認された。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical 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":"131336618","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}
{"title":"Effects of bassanite addition on shear characteristics of cement-stabilized soils","authors":"Juichi Yajima, T. Muraoka, Y. Mutoh, T. Kamei","doi":"10.3208/JGS.6.331","DOIUrl":"https://doi.org/10.3208/JGS.6.331","url":null,"abstract":"建設現場から多量に発生する廃石膏ボードは処分する方法が問題となっている。そこで，廃石膏ボードを建設資材として有効利用する技術が注目されている。廃石膏ボードから再生した二水石膏は，130℃以上の熱処理によって半水石膏となる。本研究では，半水石膏の混入率を変化させたセメント安定処理土の排水せん断特性と非排水せん断特性について検討を行い，半水石膏の地盤改良材としての有効性を検証している。その結果，半水石膏を混入したセメント安定処理土の内部摩擦角は，半水石膏混入率によらずほぼ一定値を示した。また，粘着力は半水石膏混入率の増加に伴い増加することが明らかとなった。このことから，廃石膏ボードから再生した半水石膏が軟弱地盤改良材として有効であるということを実証した。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"19 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":"122327089","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}
{"title":"Performance verification for geotechnical structures using reliability analysis based on data assimilation","authors":"T. Shuku, S. Nishimura, A. Murakami, Yuki Nishimura, K. Fujisawa","doi":"10.3208/JGS.6.415","DOIUrl":"https://doi.org/10.3208/JGS.6.415","url":null,"abstract":"国内の社会基盤施設の設計法は，これまで大量の社会資本を供給してきた仕様設計体系から信頼性設計を基本とした性能規定型の設計体系に移行しつつある。その一方で，盛土や堤防などの土構造物に対する信頼性・性能設計は，設計手法・計算モデルの予測精度の低さや地盤パラメータの不確定性に起因する種々の問題を有している。本研究では，土構造物の性能照査に適用可能な信頼性設計手法を新たに提案し，その有効性について，軟弱粘性土地盤上に築造される盛土の残留沈下問題に適用することにより検証した。提案手法は，設計段階から構造物施工完了までの全工程を設計とみなし，設計段階で最適と判断された設計に対して観測データにより積極的に再検討を行う「情報化施工」のコンセプトに基づいている。具体的な土構造物の性能照査手法として，弾粘塑性モデルを用いた土/水連成有限要素解析を用い，モンテカルロシミュレーションを用いて地盤の不確定性を評価した。さらに，粒子フィルタによるデータ同化結果に基づいて，観測施工段階における変位の予測分布の更新，および性能照査や追加対策工の検討を行った。その結果，提案手法は明示的・定量的な性能照査にも十分適用可能であり，土構造物の性能設計において有力なツールとなり得ることが示された。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"12 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":"121847081","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}
{"title":"A study on geographical analysis of a residential housing development on artificial fill","authors":"K. Matsushita, M. Fujii, Tomohiro Mori, M. Kazama, K. Hayashi","doi":"10.3208/JGS.5.89","DOIUrl":"https://doi.org/10.3208/JGS.5.89","url":null,"abstract":"大規模造成宅地において切盛分布や盛土厚さを把握する手法として，新旧地形図の比較による方法がある。しかし，新旧地形図から作成された切盛図の精度の検証はあまり行われていない。本論文は，既存の谷埋め型大規模盛土造成地（開発総面積110,000m2）をモデルとして，縮尺の異なる新旧地形図から作成した切盛図の精度比較を行うとともに，平面的に高密度に実施したスウェーデン式サウンディング（SWS）試験と表面波探査を用いて，切盛分布や盛土厚，盛土の硬さを相互に比較することによって，それぞれの地形把握手法の問題点を明確にし，造成地盤の地歴状況把握の精度の検討を試みた結果，造成宅地地盤における旧地形の把握においては，それぞれの手法の適用性から，求めたいメニューによって，地形図，SWS試験，表面波探査を適宜組み合わせて評価する必要があることが分かった事例を紹介する。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"24 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":"125010723","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}
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