{"title":"EFFECTS OF MULTIPLE-LAYER SUPPORTING METHOD IN SQUEEZING ARGILLACEOUS ROCKS","authors":"Sanpei Kemmochi, E. Taketsu, T. Aoki, R. Morita, H. Shirahata","doi":"10.2208/JSCEJF.62.312","DOIUrl":"https://doi.org/10.2208/JSCEJF.62.312","url":null,"abstract":"北陸新幹線飯山トンネルでは，著しい膨圧現象が発生したため支保工を二次，三次と分割して施工する多重支保工法を適用した．多重支保工法は，それぞれの支保工を適切に施工することにより掘削に伴う変位を管理し変形余裕量内に地山の変位を制御する工法である．施工ならびに計測結果を整理し三次元弾塑性解析を実施することにより，二次支保工の一次支保工に対する役割，また二次支保工の支保工全体に対する効果，および工法の特長が明らかになり，多重支保工法が膨圧性泥質岩地山掘削工法として極めて柔軟性に富み，安全で合理的であることを確認した．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"5 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":"125120440","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":"MEASUREMENT RESULT AND STUDY ON THE BEHAVIOR OF THE EXTRUDED CONCRETE LINING BY TBM","authors":"H. Iida, M. Nonomura, Y. Koyama, S. Konishi, A. Koizumi","doi":"10.2208/JSCEJF.63.349","DOIUrl":"https://doi.org/10.2208/JSCEJF.63.349","url":null,"abstract":"近年，コスト低減を目指して，都市部の土砂地山のトンネルにおいてもNATMを採用するケースが増えてきており，NATMとシールド工法は競合し，境界は不明瞭になるとともに，両工法の境界領域では，施工法の選定，トンネル覆工体の設計法，トンネルに作用する荷重の評価方法などが大きな課題となっている．東北新幹線三本木原トンネルでは，両工法の境界領域の地山を対象として密閉型シールドを用いた場所打ちライニング工法を採用し，ライニングをNATMの一次支保材と同様に位置付ける新しいトンネル構築方法を開発した．本論文は，三本木原トンネルの施工時に現場計測を行い，その結果を考察し，これまで明確にされていなかった場所打ちライニングの挙動について明らかにしたものである．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"11 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":"121441035","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":"APPLICATION OF AN IMPROVED PARTICLE SWARM OPTIMIZATION TO THE CORROSION DEPTH PREDICTION IN CONCRETE SEWER PIPES","authors":"T. Matsukawa, A. Miyamoto, Hideaki Nakamura","doi":"10.2208/JSCEJF.66.112","DOIUrl":"https://doi.org/10.2208/JSCEJF.66.112","url":null,"abstract":"本研究では，メタ戦略の一つである従来型の粒子群最適化のアルゴリズムに対して，［1］解空間の効率的な絞り込みと，［2］粒子の移動速度に減速機能を設けるといったシンプルな改良を図ることで，これら2つの機能の相乗効果によって最適解の探索効率が向上した．また新たな試みとして，求解困難な問題と考えられていたコンクリート製下水管路の腐食劣化現象の将来予測に，この改良型粒子群最適化を適用して，腐食深度予測式を新たに構築したことを特徴とする．その際，［1］硫化水素ガスの発生量，［2］下水管内の気温の1年分の計測データ，［3］下水管路の供用年数，［4］管壁材料の種類の情報を説明変数として採用した．本論文では，この改良型粒子群最適化の有用性と，腐食深度予測手法および予測式の有効性を検証した．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"53 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":"127568828","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 DEGRADATION MECHANISM OF CLAYEY ROADBEDS UNDER BALLASTLESS-TRACK AND ITS COUNTERMEASURES","authors":"K. Muramoto, E. Sekine","doi":"10.2208/JSCEJF.62.519","DOIUrl":"https://doi.org/10.2208/JSCEJF.62.519","url":null,"abstract":"","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"23 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":"127448202","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":"CURRENT STATUS AND FUTURE ISSUES ON BRIDGE MAINTENANCE AND BRIDGE MANAGEMENT SYSTEM","authors":"H. Furuta, M. Kayano, E. Watanabe","doi":"10.2208/JSCEJF.63.287","DOIUrl":"https://doi.org/10.2208/JSCEJF.63.287","url":null,"abstract":"現在，世界各国で社会基盤施設の維持管理が焦眉の課題となっている．既存施設は，橋梁一つをとっても非常に多くあり，それらすべてを健全な状態に維持していくことは，経済的，社会的，技術的に容易ではない．周知のように，現在のわが国の経済状態では，潤沢な維持管理費用は期待できず，そして，何よりも未だ依然として技術的にも多くの問題を抱えている．また一般に重要性の認識も十分ではなく，その理解と支持を得るためには絶え間の無い努力が必要である． これらの情勢の中，現在ブリッジマネジメントシステムあるいはアセットマネジメントシステムが注目を浴びている．本稿では，まず橋梁の維持管理の現状と問題点を明らかとし，ブリッジマネジメントシステムとアセットマネジメントの違いについて説明する．そして，両者の維持管理における可能性について言及し，その将来展望について詳述する．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"238 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":"132766569","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":"PRACTICAL USE OF AUTO TRACKING TOTAL STATION IN HYBRID DRILLING GUIDANCE SYSTEM OF ROCK DRILL","authors":"Hirofumi Miyahara, T. Sakaguchi, Takashi Matsuike, Mitsumasa Ogasawara, Ko Kawano, K. Nakagawa","doi":"10.2208/JSCEJF.65.32","DOIUrl":"https://doi.org/10.2208/JSCEJF.65.32","url":null,"abstract":"発破工法のトンネル掘削における削孔精度の重要性は，過去の研究において明らかにされている．近年，削岩機に各種の削孔誘導装置を装備する事例が増加しているが，誘導装置の経年劣化という課題があった．筆者らはロボット工学の見地から，内界センサ方式が主流であった削孔誘導装置に，自動追尾トータルステーションを外界センサとして活用したハイブリッド方式を開発した．実機試験の結果，1200時間稼動後の削孔精度の標準偏差は，高さ方向で約17mm，横方向で約37mmであった．また平均余掘長は従来技術と比較して約44mmの低減が認められ，土木分野におけるロボット工学の応用例を示した．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"9 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":"131029811","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}
The purpose of this study was to understand the flow properties and permeability of bentonite grout with NaCl added, using laboratory tests, and to clarify the mixing conditions of bentonite as a material. Given that the required permeability of clay grout is 10 − 9 (m/s), the combination of grout (W/B) becomes 6 or less. The viscosity of the grout was measured, and because the viscosity was higher than the thickest cement milk on dam grouting, it was found that grout with a W/B of less than 10 was difficult to inject into rock joints. We then added NaCl to grout with a W/B is 6, and its viscosity decreased as the amount of NaCl increased. A grout of viscosity able to be injected into rock joints was achieved by adding NaCl in a density higher than ”W: NaCl = 40:1”. Next, the permeability of a bentonite suspension with NaCl was examined using the falling head permeability test. Testing the sample ”B:W:NaCl = 20:20:1” for 10 days revealed that the initial permeability 10 − 8 (m/s) decreased to 10 − 10 〜 10 − 11 (m/s). These results showed that a suspension to inject into rock joints could be made by adding NaCl, and clarified that permeation of groundwater into the suspension causes a decline in permeability.
{"title":"MIXING CONDITIONS IN APPLICATION OF BENTONITE GROUTING TO RADIOACTIVE WASTE DISPOSAL","authors":"H. Kobayakawa, Hiroshi Ito","doi":"10.2208/JSCEJF.63.53","DOIUrl":"https://doi.org/10.2208/JSCEJF.63.53","url":null,"abstract":"The purpose of this study was to understand the flow properties and permeability of bentonite grout with NaCl added, using laboratory tests, and to clarify the mixing conditions of bentonite as a material. Given that the required permeability of clay grout is 10 − 9 (m/s), the combination of grout (W/B) becomes 6 or less. The viscosity of the grout was measured, and because the viscosity was higher than the thickest cement milk on dam grouting, it was found that grout with a W/B of less than 10 was difficult to inject into rock joints. We then added NaCl to grout with a W/B is 6, and its viscosity decreased as the amount of NaCl increased. A grout of viscosity able to be injected into rock joints was achieved by adding NaCl in a density higher than ”W: NaCl = 40:1”. Next, the permeability of a bentonite suspension with NaCl was examined using the falling head permeability test. Testing the sample ”B:W:NaCl = 20:20:1” for 10 days revealed that the initial permeability 10 − 8 (m/s) decreased to 10 − 10 〜 10 − 11 (m/s). These results showed that a suspension to inject into rock joints could be made by adding NaCl, and clarified that permeation of groundwater into the suspension causes a decline in permeability.","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"6 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":"132019220","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 PROBABILISTIC EVALUATION OF CRITICAL LINE OF SEDIMENTRELATED DISASTER OCCURRENCE BY A LOGISTIC REGRESSION MODEL","authors":"Tsuguhiro Shinozaki, K. Fukuda, Hiroyuki Ohishi, Shigemitsu Sugihara, K. Furukawa","doi":"10.2208/JSCEJF.66.122","DOIUrl":"https://doi.org/10.2208/JSCEJF.66.122","url":null,"abstract":"平成17年度より土砂災害警戒情報の運用が始まっているが，土砂災害の発生危険基準線を構成するRBFN値の理解や周知が不十分であることや，避難勧告等の発令において予測雨量の精度の問題からタイミングよく住民へ避難を促すことができていない事例が見られる．そこで，本研究ではロジスティック回帰モデルを用いて，土砂災害警戒情報の発表や避難勧告等に用いられている指標を，より切迫性を実感しやすい確率値という形で表現することにより，災害発生の危険性や，予測雨量に頼らない 1時間先の超過予測の設定を試みた．また，発生確率の適用性を検証するため，他地域においてモデルの検証を行い，その有効性を確認した．さらに，10分間雨量データを用いて急激な降雨変動に対して，どの程度の予測の向上が可能であるかの検討を行った．","PeriodicalId":245964,"journal":{"name":"Doboku Gakkai Ronbunshuu F","volume":"5 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":"121325360","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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