Y. Furuya, Y. Hagihara, Masayuki Ota, S. Arai, H. Kusaka
{"title":"A study on the liquefaction judgment method of diluvia sandy soil layers","authors":"Y. Furuya, Y. Hagihara, Masayuki Ota, S. Arai, H. Kusaka","doi":"10.3208/JGS.9.633","DOIUrl":"https://doi.org/10.3208/JGS.9.633","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"13 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":"125617573","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":"Prevention of liquefaction of shallow backfill ground and of up-lift of underground facilities by use of stabilized mud","authors":"Y. Murakami, S. Goto, Tetsuya Yoneyama","doi":"10.3208/jgs.2.87","DOIUrl":"https://doi.org/10.3208/jgs.2.87","url":null,"abstract":"建設泥土を消石灰で安定処理して造粒化させた礫を砂に混合させ，それを埋戻し材として用いる場合について，地震発生時での浅い埋戻し地盤の液状化ならびにそこに埋設された管路の浮き上がりを防止できる可能性を振動台実験によって調べた。その結果，同じ相対密度でみた場合，砂に対する礫の混合比率が高いほど，過剰間隙水圧の発生量を低減できることが分かった。また，砂と礫の質量混合比を7：3程度,かつ相対密度を50% 以上に締め固めることによって，埋戻し地盤の液状化と埋設管の浮き上がりを十分に抑止できることが明らかにされた。","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":"123890758","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":"Study on stress reduction effect of bridge piers due to basemat uplift and soil yielding","authors":"Takafumi Inoue, A. Mikami","doi":"10.3208/JGS.10.1","DOIUrl":"https://doi.org/10.3208/JGS.10.1","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"26 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":"115648553","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":"Settlement-time behavior of peat ground and applicability of conventional predicting methods","authors":"Nobutaka Yamazoe, Hiroyuki Tanaka, H. Hayashi, T. Mitachi","doi":"10.3208/JGS.6.395","DOIUrl":"https://doi.org/10.3208/JGS.6.395","url":null,"abstract":"泥炭地盤上での建設工事では，大きな沈下が長期間に渡り発生するため，その予測は工学的に重要な課題の一つである。本論文では，泥炭地盤の圧密沈下挙動の予測を困難としている主要な要因として，原位置透水係数の評価や圧密沈下に伴う層厚減少，せん断変形に付随する鉛直方向の変形，圧密係数cvの圧密圧力依存性を取り上げ，cvが大きく異なる泥炭地盤上の二つの試験盛土を対象に一次元・二次元水～土連成微小／有限変形弾塑性FEM解析を実施し，上記要因の影響を調べている。また，圧密圧力によるcvの低下度合いを変化させた一連の一次元解析を行い，その圧密沈下挙動を検討した。以上の成果に基づき，地盤設計実務では泥炭式と呼ばれる実務経験式およびTerzaghi理論による慣用沈下予測式の適用性と適用にあたっての留意点を明らかにしている。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"46 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":"115777682","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":"Suggestions for maintenance checks of the Rope-net method","authors":"Masaya Fujita, K. Sawada, A. Yashima, Shinichi Arai, Ryuta Suzaki, Y. Takizawa","doi":"10.3208/JGS.5.437","DOIUrl":"https://doi.org/10.3208/JGS.5.437","url":null,"abstract":"斜面に存在する岩塊を安定化させるために用いられるロープネット工に関する維持管理の課題を解決するため，現地調査，素線のめっき量調査および腐食ロープの引張試験を実施した。現地調査の結果，ロープネット工には，さびによる腐食が発生しやすく，それらはワイヤーロープが立木や地表面に接している箇所に発生しやすいことがわかった。素線のめっき量調査結果から，良好な山林環境におけるワイヤーロープ部材の耐用年数は100年以上期待できることがわかった。また，腐食ロープの引張試験結果から，ワイヤーロープの寿命曲線を提案し，腐食しやすい箇所は施工後20年程度でワイヤーロープの部材を交換しなければならないことがわかった。以上のことからロープネット工施設は，適切な維持管理により腐食部材を順次交換することにより，30年程度と考えられていた施設の耐用年数を大幅に延ばすことが可能である。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical 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":"116233359","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":"Numerical simulation on groundwater contamination by organoarsenic compounds in Kamisu City, Ibaraki Prefecture, Japan","authors":"Shun-ichi Watanabe, Nobuyuki Egusa, T. Hirata, N. Yokoyama, Y. Yamazato, M. Morita","doi":"10.3208/JGS.6.383","DOIUrl":"https://doi.org/10.3208/JGS.6.383","url":null,"abstract":"本稿では，3次元数値解析を実施して，茨城県神栖市で起きた有機ヒ素化合物(ジフェニルアルシン酸，DPAA)による地下水汚染機構を明らかにした。汚染が発見された飲用井戸(A井戸)周辺を対象とした数値解析では，A井戸南東90m地点の表層地盤中で発見されたコンクリート様の塊から溶出したDPAAを高濃度に含む汚染水が，密度流によって地下深くまで降下浸透し，深度30m付近の洪積砂礫層に達した後，流速の大きな地下水流れに乗って，A井戸およびその下流域にまで拡がっていく様子が示された。これにより，A井戸の汚染の原因はコンクリート様の塊から溶出したDPAAであることが推察された。また，汚染地域全体を対象とした数値解析では，汚染発見によって複数の企業局揚水井戸の運転が停止されるまでの間，これらの井戸からの揚水の影響でDPAAの下流への拡散が抑制されていた可能性が高いことも示唆された。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"215 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":"115161702","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}
H. Muto, Takashi Kamiya, A. Naganuma, T. Kodaka, C. Ying, M. Nakano, T. Noda
A newly developed reinforced member incorporating both a bearing resistance and a friction resistance was confirmed the effectiveness using a prototype reinforced earth wall. The axial forces of the reinforcement members installed in the prototype reinforced earth wall were measured through a construction experiment and a field measurement. As a result, the measured axis forces of the reinforcement members increased during the construction of the reinforced earth wall. Then, the most of the axis forces of the reinforcement members were kept constant after the construction. The resistances by both the friction plate and the bearing plate occurred from the early stage of the construction, and then converged at the final stage of the construction. The measured friction resistance was greater than that of the bearing resistance at the upper part of the reinforced earth wall. On the other hand, the contribution ratio of the friction resistance decreased with increasing the overburden pressure, and converged to about 40 %.
{"title":"Construction Experiment of Reinforced Soil Wall Using Reinforcement Member Incorporating Both Friction Resistance and Bearing Resistance","authors":"H. Muto, Takashi Kamiya, A. Naganuma, T. Kodaka, C. Ying, M. Nakano, T. Noda","doi":"10.3208/JGS.12.33","DOIUrl":"https://doi.org/10.3208/JGS.12.33","url":null,"abstract":"A newly developed reinforced member incorporating both a bearing resistance and a friction resistance was confirmed the effectiveness using a prototype reinforced earth wall. The axial forces of the reinforcement members installed in the prototype reinforced earth wall were measured through a construction experiment and a field measurement. As a result, the measured axis forces of the reinforcement members increased during the construction of the reinforced earth wall. Then, the most of the axis forces of the reinforcement members were kept constant after the construction. The resistances by both the friction plate and the bearing plate occurred from the early stage of the construction, and then converged at the final stage of the construction. The measured friction resistance was greater than that of the bearing resistance at the upper part of the reinforced earth wall. On the other hand, the contribution ratio of the friction resistance decreased with increasing the overburden pressure, and converged to about 40 %.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"34 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":"121587029","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":"Shear characteristics of over consolidated peat in constant volume ring shear test","authors":"Masaru Igarashi, H. Oikawa, Toshihiro Ogino, M. Tsushima","doi":"10.3208/JGS.3.175","DOIUrl":"https://doi.org/10.3208/JGS.3.175","url":null,"abstract":"正規圧密および過圧密された高有機質土に対して定体積リングせん断試験を行い，これまでの三軸試験を通した検討では見られなかった高有機質土のせん断特性の一端を明らかにしている。先ず，定体積リングせん断試験では高有機質土でもせん断応力にピークが現れ，その非排水せん断強さは明確に決定できることを明らかにした上で，破壊時の変位量は圧密圧力や過圧密比に依存するものの，間隙比との間には一義的な関係にあること，せん断初期の応力～変位関係は双曲線で近似でき，その漸近線が示す応力とピーク強度の間には比例関係が認められること，正規圧密試料でも圧密圧力～強度関係は原点を通らないこと，かつ，得られる強度増加率は三軸圧縮試験による値より小さいこと，また，せん断抵抗角も三軸圧縮試験から得られる値よりかなり小さいこと，さらには，ピーク強度後の応力経路は破壊包絡線の外を推移する極めて特異な形を示すこと，などを明らかにしている。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"33 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":"122072564","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":"Reply to the discussion on ^|^ldquo;A simple method for evaluation of jointed rock slope stability using slide surface approximated by piecewise linear^|^rdquo;","authors":"Taketomi Sumi, K. Sawada, A. Yashima","doi":"10.3208/JGS.9.775","DOIUrl":"https://doi.org/10.3208/JGS.9.775","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":" 1229","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113946505","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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