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Characteristics of horizontal subgrade reaction of piles in liquefiable sand 可液化砂土中桩基水平反力特性研究
Doboku Gakkai Ronbunshuu C Pub Date : 2010-06-17 DOI: 10.2208/JSCEJC.66.312
S. Imamura
{"title":"Characteristics of horizontal subgrade reaction of piles in liquefiable sand","authors":"S. Imamura","doi":"10.2208/JSCEJC.66.312","DOIUrl":"https://doi.org/10.2208/JSCEJC.66.312","url":null,"abstract":"本研究では，液状化地盤における杭の水平地盤反力特性を明らかにすることを目的として，模型地盤に対する振動実験と振動直後に行われる4本の組杭基礎の交番載荷試験を組み合わせた遠心模型実験を行った．実験では，数種類の加振エネルギーが異なる地震波を模型地盤に与え，深度，入力波，過剰間隙水圧比，水平変位量および地下水位が杭の水平地盤反力特性に及ぼす影響を調べた．さらに一連の実験結果を整理し，地盤の非線形領域までに至る連続的な地盤反力係数の推定式および地盤反力変位関係式を双曲線関数を用いて構築した．これらの推定式の精度向上には，過剰間隙水圧比と地盤反力係数比の関係を正確にモデル化し，深度，入力波および地盤構成に対応した推定式の構築が必要であることを明らかにした．","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130041713","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
STRENGTH PROPERTY AND POLLUTANT ELUTION CHARACTERISTICS OF CONTAMINATED SEDIMENT TREATED BY CEMENT-MIXING AND MECHANICAL DEHYDRATION 水泥搅拌机械脱水处理污染沉积物强度特性及污染物洗脱特性
Doboku Gakkai Ronbunshuu C Pub Date : 2007-06-01 DOI: 10.2208/JSCEJC.63.544
笠間 清伸, 善 功企, 陳 光斉, 倉富 樹一郎, K. Kasama, K. Zen, Guang-qi Chen, Kiichiro Kuratomi
{"title":"STRENGTH PROPERTY AND POLLUTANT ELUTION CHARACTERISTICS OF CONTAMINATED SEDIMENT TREATED BY CEMENT-MIXING AND MECHANICAL DEHYDRATION","authors":"笠間 清伸, 善 功企, 陳 光斉, 倉富 樹一郎, K. Kasama, K. Zen, Guang-qi Chen, Kiichiro Kuratomi","doi":"10.2208/JSCEJC.63.544","DOIUrl":"https://doi.org/10.2208/JSCEJC.63.544","url":null,"abstract":"本論文では，重金属，トリブチルスズ(TBT)およびトリフェニルスズ(TPT)を含む汚染粘土を対象に，固化材等を混合し高圧で機械脱水を行う手法(以下，高圧脱水固化処理とよぶ)を用いて，汚染粘土の強度特性の改善および汚染粘土中に含まれる有害物質の溶出低減効果を調べた．得られた結論をまとめると以下のようになる．(1) 固化材添加率30％および脱水圧力10MPa以上の作製条件において，10MPaを超える一軸圧縮強度を有する固化処理土を作製できる． (2)高圧脱水固化処理により，汚染粘土からの重金属の溶出を環境基準値以下に低減できる．(3) 高圧脱水固化処理後の汚染粘土からのTBTとTPTの溶出量は，アルカリ性領域において，溶媒のpHの指数関数として表すことができる．","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"17 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133774024","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: 2
STUDY ON VERIFICATION OF ROCKFALL SIMULATION USING IMPROVED DDA CONSIDERING THE CHARACTERISTICS OF VELOCITY ENERGY RATIO AT IMPACT 考虑冲击时速度能比特性的改进dda岩崩模拟验证研究
Doboku Gakkai Ronbunshuu C Pub Date : 2006-10-20 DOI: 10.2208/JSCEJC.62.707
T. Shimauchi, Y. Ohnishi, S. Nishiyama, N. Sakai
{"title":"STUDY ON VERIFICATION OF ROCKFALL SIMULATION USING IMPROVED DDA CONSIDERING THE CHARACTERISTICS OF VELOCITY ENERGY RATIO AT IMPACT","authors":"T. Shimauchi, Y. Ohnishi, S. Nishiyama, N. Sakai","doi":"10.2208/JSCEJC.62.707","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.707","url":null,"abstract":"","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122106418","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: 4
MICROCRACK GENERATION AND PROPAGATION IN GRANITE DURING STRESS RELAXATION UNDER WATER-SATURATED TRI-AXIAL CONDITION 三轴饱和条件下花岗岩应力松弛过程中微裂纹的产生与扩展
Doboku Gakkai Ronbunshuu C Pub Date : 2006-10-20 DOI: 10.2208/JSCEJC.62.623
Shixin Liu, A. Anwar, T. Seiki, Y. Ichikawa
{"title":"MICROCRACK GENERATION AND PROPAGATION IN GRANITE DURING STRESS RELAXATION UNDER WATER-SATURATED TRI-AXIAL CONDITION","authors":"Shixin Liu, A. Anwar, T. Seiki, Y. Ichikawa","doi":"10.2208/JSCEJC.62.623","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.623","url":null,"abstract":"Microcrack generation and propagation is an important phenomenon, which describes the long-term behavior of a crystalline rock. In this study, a progressive development of microcrack in granite and its proagation was observed using microscope under water-saturated triaxial compression. A series of triaxial relaxation tests was performed with fine and coarse grained granite. Results revealed that there exists a strong relationship between the stress relaxation and the microcrack propagation. Three stages of stress relxation rate were identified where stage one offers the maximum microcrack generation and propagation. The microcrack propagation in fine grain granite was found higher than the coarse grain granite because of higher number of contact points between the grain boundaries. Stress concentration occurs in these boundaries and microcracks are propagated through these contact points.","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116219450","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
A METHOD FOR DESIGNING CAISSON BOTTOM SLABS CONSIDERING MOUND UNEVENNESS 考虑土墩不平整的沉箱底板设计方法
Doboku Gakkai Ronbunshuu C Pub Date : 2006-07-20 DOI: 10.2208/JSCEJC.62.277
T. Nagao, M. Miyata, Yoichi Moriya, T. Sugano
{"title":"A METHOD FOR DESIGNING CAISSON BOTTOM SLABS CONSIDERING MOUND UNEVENNESS","authors":"T. Nagao, M. Miyata, Yoichi Moriya, T. Sugano","doi":"10.2208/JSCEJC.62.277","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.277","url":null,"abstract":"This study proposes a method for designing the bottom slabs of composite caisson breakwaters considering the unevenness of rubble mound surfaces. Based on the results of large-scale model tests, we developed a stochastic model to represent the distributions of reactions acting on the bottom slabs of caissons. We then conducted reliability analyses on the model to calculate the bending failure probabilities of the bottom slabs with respect to the mound unevenness. We also evaluated the partial factors to be used in designing the bottom slabs of caissons at various degrees of mound unevenness.","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123904678","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
土のう積層体による地盤振動の発振側・伝播経路・受振側での低減法 由土壤积层体引起的地基振动的振荡侧·传播路径·受振侧的降低法
Doboku Gakkai Ronbunshuu C Pub Date : 2006-07-20 DOI: 10.2208/JSCEJC.62.379
元 松岡, 友宏 安藤
{"title":"土のう積層体による地盤振動の発振側・伝播経路・受振側での低減法","authors":"元 松岡, 友宏 安藤","doi":"10.2208/JSCEJC.62.379","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.379","url":null,"abstract":"これまでに，土を薄い袋で包んだだけの土のうが予想外の高い強度を示し，建造物の基礎補強や擁壁の築造などに有効に用いられることを示してきた．ここでは，土のう積層体がそのしなやかさや個別性 (バラバラの土のうの集合体であること) などにより，特異な振動低減特性を有することを見出し，それを利用して交通などによる地盤振動を発振側 (振動を発する道路・鉄道下の地盤中)，伝播経路 (振動が伝わる途中の地盤中) および受振側 (振動を受ける建物の基礎地盤中) で低減させる方法を示す．このとき，土のう積層体が一般に振動を低減させることが難しいとされている低周波数 (10Hz 以下) の振動 (人体が感じやすい周波数域) に対して特に効果的であることを示す．","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115600757","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: 6
加圧板法と土柱法に基づく砂の水・油・空気3相保持特性の考察 基于加压板法和土柱法的沙子的水、油、空气三相保持特性的考察
Doboku Gakkai Ronbunshuu C Pub Date : 2006-07-20 DOI: 10.2208/JSCEJC.62.320
秀行 棚橋, 健司 佐藤, 純 小西
{"title":"加圧板法と土柱法に基づく砂の水・油・空気3相保持特性の考察","authors":"秀行 棚橋, 健司 佐藤, 純 小西","doi":"10.2208/JSCEJC.62.320","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.320","url":null,"abstract":"地盤の多相流解析で用いられる水・油・空気3相保持特性に関する経験式を加圧板法と土柱法で吟味した．加圧板法では3相系水分飽和度と水分保持特性曲線は油層厚の薄いときに近い値となったが，土柱法では全液相飽和度と油分保持特性曲線は油層厚が薄いときには一致せず，既往の経験式の信頼性が低いことを示す結果が得られた．油汚染地盤において，観測井で検出される油層厚は数cmオーダーで，油層厚の薄い汚染範囲が面積的に最も大きい．全液相飽和度と油分保持特性曲線が一致する既往の経験式を適用すると，地盤内の油分布範囲と量を過小評価し，危険側の予測結果になることを指摘した．","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127418323","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
EVALUATION OF ATTENUATION OF IMPACT ON BENTONITE-BASED BUFFER UNDER CONSTRUCTION 施工中对膨润土基缓冲液影响衰减的评价
Doboku Gakkai Ronbunshuu C Pub Date : 2006-07-20 DOI: 10.2208/JSCEJC.62.292
R. Masuda, H. Asano, H. Tada, T. Nishimura, K. Amemiya, H. Komine
{"title":"EVALUATION OF ATTENUATION OF IMPACT ON BENTONITE-BASED BUFFER UNDER CONSTRUCTION","authors":"R. Masuda, H. Asano, H. Tada, T. Nishimura, K. Amemiya, H. Komine","doi":"10.2208/JSCEJC.62.292","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.292","url":null,"abstract":"In in-situ compaction method, where the material is directly compacted in the disposal pit, possible damage to the surrounding rock and waste package due to the impact of compaction are issues of concern. While an evaluation of the effect of impact is necessary, the analysis based on Finite Elemental Method (FEM) has not yet been achieved with sufficient accuracy. Experiments were carried out and data obtained for the acceleration damping characteristics of the buffer material. The results were then used with an analytical model in order to improve the accuracy of the analysis. By comparing this with data obtained from full-scale experiment, it was possible to confirm the validity of the analysis that takes acceleration damping characteristics.","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126661408","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
ESTIMATION OF GROUND REINFORCEMENT EFFECTS OF LONG FACEBOLTS BASED ON ADHESIVE PROPERTIES OF BOLTS WITH GROUND 基于螺栓与地面黏附性能的长面螺栓地面加固效果评估
Doboku Gakkai Ronbunshuu C Pub Date : 2006-03-21 DOI: 10.2208/JSCEJC.62.110
Isamu Ohtsuka, T. Aoki, T. Ohmachi, Hiroshi Ito
{"title":"ESTIMATION OF GROUND REINFORCEMENT EFFECTS OF LONG FACEBOLTS BASED ON ADHESIVE PROPERTIES OF BOLTS WITH GROUND","authors":"Isamu Ohtsuka, T. Aoki, T. Ohmachi, Hiroshi Ito","doi":"10.2208/JSCEJC.62.110","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.110","url":null,"abstract":"近年，山岳トンネルの補助工法である長尺鏡止めボルトは，鏡面の安定対策として採用され，その施工実績は増加している．しかしながら，ボルトによる地山補強効果については不明な点が多いのが現状である．本論文では，長尺鏡止めボルトによる地山補強効果を原位置試験と数値解析によって定量的に評価する方法について述べる．特に，地山とボルトとの付着特性に着目し，三次元数値解析によって地山とボルトとの付着特性の違いが長尺鏡止めボルトの補強効果に及ぼす影響について検討した．付着特性が異なると地山とボルトとの相互作用機構が異なり，鏡面の押出し変位量の抑制効果に違いが現れることを指摘する．","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114155897","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
MECHANICAL BEHAVIOR OF GRANULAR MATERIAL WITH PARTICLE BREAKAGE UNDER VARIOUS STRESS CONDITIONS 不同应力条件下颗粒破碎颗粒材料的力学行为
Doboku Gakkai Ronbunshuu C Pub Date : 2006-03-21 DOI: 10.2208/JSCEJC.62.157
D. Hotta, S. Miura
{"title":"MECHANICAL BEHAVIOR OF GRANULAR MATERIAL WITH PARTICLE BREAKAGE UNDER VARIOUS STRESS CONDITIONS","authors":"D. Hotta, S. Miura","doi":"10.2208/JSCEJC.62.157","DOIUrl":"https://doi.org/10.2208/JSCEJC.62.157","url":null,"abstract":"本研究では等方圧密または異方圧密された供試体の平均有効主応力を一定に保持した一連の単調ねじりせん断試験，繰返しねじりせん断試験を実施し，圧密条件や載荷条件の違いによる粒子破砕挙動について詳細に調べた．その結果，単調載荷過程における粒子破砕特性は有効応力比のみならず，主応力軸回転の有無およびその方向によって異なることが明示された．また，繰返し載荷過程で生じる粒子破砕は等方圧密供試体に比べて異方圧密供試体において卓越したことから，連続的な主応力軸回転が粒子破砕特性に影響を及ぼす可能性が示された．さらに，繰返し載荷過程で生じる粒子破砕は応力とひずみの時刻歴から求まる累積塑性仕事量によって定量化できることを明らかにした．","PeriodicalId":131805,"journal":{"name":"Doboku Gakkai Ronbunshuu C","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128940202","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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