Search Results 1-20 of 37

  • 1 / 2
  • Effect of spatial variability on undrained triaxial test of cement-admixed soil

    Pan Yutao , Lee Fook Hou , Liu Yong , Xiao Huawen

    … The material properties of cement-admixed soil vary spatially. … Statistical parameters such as mean, coefficient of variation and scale of fluctuation were used to characterize the spatial variability of cement-admixed soil. …

    Japanese Geotechnical Society Special Publication 2(62), 2101-2106, 2016

    J-STAGE 

  • CHARACTERIZATION OF TRANSFORMATION ERROR IN GEOTECHNICAL STRUCTURAL DESIGN  [in Japanese]

    OTAKE Yu , HONJO Yusuke

    地盤構造物設計では,設計に必要な地盤パラメータを現場での計測値(N値など)から変換する場合が多い.この変換作業は,一般的に過去の調査結果に基づく経験式により行われるため,大きな不確実性を含む場合が多い.この誤差は変換誤差と呼称され,地盤構造物特有の不確実性の要因のひとつである.本研究では,地盤構造物の信頼性解析を行うための基礎資料を作成するために,主として日本国内の主要な変換誤差を包括的に整理した …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 70(2), 186-198, 2014

    J-STAGE 

  • Spatial variability of photosynthetic production and ecosystem respiration on a hundred-kilometer scale within a Mongolian semiarid grassland

    NAKANO Tomoko , SHINODA Masato

    … Grassland ecosystems cover a large area of the land surface and play an important role in the global carbon cycle. …

    Journal of Agricultural Meteorology 70(2), 105-116, 2014

    J-STAGE 

  • VERIFICATION OF STATISTICAL ESTIMATION ERROR EVALUATION THEORY OF LOCAL AVERAGES OF GEOTECHNICAL PARAMETERS  [in Japanese]

    HONJO Yusuke , OTAKE Yu

    著者らは先に,地盤構造物の信頼性解析に当たり,地盤パラメータの空間的なばらつきと,これに伴う統計的推定誤差を評価する理論の基本的枠組みと方法について提案した.具体的には,地盤を定常確率場として単純化・理想化した上で,この確率場より得られた限られた数の標本により,確率場の任意地点の局所平均値を推定する問題を定式化した.地盤パラメータ局所平均の推定は,調査位置と構造物建設位置を特定しない一般推定と,こ …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 68(3), 491-507, 2012

    J-STAGE  Cited by (1)

  • VERIFICATION OF A SIMPLIFIED GEOTECHNICAL RELIABILITY ANALYSIS SCHEME OF SPATIAL VARIABILITY BASED ON LOCAL AVERAGE OF GEOTECHNICAL PARAMETERS  [in Japanese]

    OTAKE Yu , HONJO Yusuke

    著者らは先に,地盤構造物の信頼性解析に当たり,地盤パラメータの空間的なばらつきと,これに伴う統計的推定誤差を評価する理論の基本的枠組みと方法について提案した.具体的には,地盤を定常確率場として単純化・理想化した上で,この確率場より得られた限られた数の標本により,確率場の任意地点の局所平均値を推定する問題を定式化した.本研究は,この理論における空間的ばらつきの評価法を検証するため,基礎構造物の典型的 …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 68(3), 475-490, 2012

    J-STAGE  Cited by (2)

  • A SIMPLIFIED SCHEME TO EVALUATE SPATIAL VARIABILITY AND STATISTICAL ESTIMATION ERROR OF LOCAL AVERAGE OF GEOTECHNICAL PARAMETERS IN RELIABILITY ANALYSIS

    HONJO Yusuke , OTAKE Yu , KATO Hidekazu

    本研究は,地盤構造物の信頼性解析に当たり,地盤パラメータの空間的なばらつきと,これに伴う統計的推定誤差を評価する理論の,基本的枠組みと方法について,提案を行うものである.地盤は,定常確率場として単純化,理想化してモデル化され,この確率場より得られた限られた数の標本により,確率場の任意地点の局所平均値を推定する問題を定式化している.推定は,調査位置と構造物建設位置を特定しない一般推定と,これを特定す …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 68(1), 41-55, 2012

    J-STAGE  Cited by (2)

  • Reliability-Based Design for Liquefaction Mitigation by Using Conditional Simulation  [in Japanese]

    NISHIMURA Shin-ichi , SHIMIZU Hideyoshi

    本研究は,砂質地盤の液状化を対象に,その液状化確率の算定と,リスクの低減を目的とした対策に対して,信頼性設計を実施している.液状化確率は,土質定数の空間的なばらつきを考慮して算定している.第一に,最尤法を利用して,N 値,細粒分含有率<i>F</i><sub><i>c</i></sub>の統計モデルを決定し,経験式をとおして動 …

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 79(5), 329-337, 2011-10-25

    J-STAGE  References (17)

  • Optimum Embankment Design for Mitigation of Liquefaction Risk Based on Minimization of Expected Total Cost  [in Japanese]

    Nishimura Shin-ichi , Shimizu Hideyoshi

    … The main purpose of this research is to develop a calculation method to assess the probability of liquefaction and a reliability-based design method to mitigate the liquefaction in the embankments constructed with sandy material. …

    地盤工学会誌 = / the Japanese Geotechnical Society 57(3), 26-29, 2009-03-01

    NDL Digital Collections  References (12)

  • Dimensionless parameters controlling occurrence of shallow landslides  [in Japanese]

    IMAIZUMI Fumitoshi , MAITA Hideji , MIYAMOTO Kuniaki

    … We need to predict the timing, location, and volume of landslides for the better disaster mitigation and the better estimation of the bed deformation of mountainous rivers. …

    Journal of the Japan Society of Erosion Control Engineering 62(2), 13-20, 2009

    J-STAGE 

  • Effect of Spatial Variability of Soil Parameters on Settlement of a Shallow Foundation

    Nazieh JLILATI Mohamad , HONJO Yusuke

    … The sources of uncertainties in reliability analysis are usually classified to four categories, namely physical uncertainty, model uncertainty, statistical uncertainty and gross error. … In the actual situation, however, what we observe is combined result of all these uncertainties. …

    Theoretical and Applied Mechanics Japan 57(0), 49-56, 2009

    J-STAGE 

  • Effects of Spatial Variability of soil parameters on settlement of a Shallow Foundation  [in Japanese]

    Jlilati Mohamad Nazieh , Honjo Yusuke

    信頼性解析の不確実性の源は通常、物理的不確実性、モデルの不確実性、統計的不確実性とそれらの総合的な不確実性の4つのカテゴリーに分類される。実際の状況では、これら全ての不確実性が組み合わさり、1つの不確実性として観察される。本研究の目的は、地盤基礎を対象としてモンテカルロシュミレーション(MCS)及び有限要素法(FEM)導入により物理的な不確実性を定量的に評価することである。その1例として、統計的に …

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 57(0), 128-128, 2008

    J-STAGE 

  • Erosion Rates of Soils Improved by Chemical Additives for Protection against Overland Flow

    Awad Islam , Yasufuku Noriyuki , Ochiai Hidetoshi

    … Overland flow erosion is frequently observed for the volcanic ash sandy soil named as Shirasu located in south western Japan. … This paper presents a primary study to predict the rate of soil loss by overflow erosion (Er) and its relation with the peak compressive strength (qu). … Series of physical models tests were performed on different samples of Shirasu soils reinforced by chemical additives such as calcium hydroxide and calcium oxide. …

    九州大学工学紀要 67(4), 153-164, 2007-12-20

    IR 

  • Spatial Variability of Organic Matter Dynamics in the Semi-Arid Croplands of Northern Kazakhstan

    YANAI Junta , MISHIMA Azusa , FUNAKAWA Shinya , AKSHALOV Kanat , KOSAKI Takashi

    … Chernozem soils have been recognized as one of the most important soils for food production and for the sink of organic matter on a global scale. … Soil degradation or accelerated organic matter decomposition has been reported recently in northern Kazakhstan due to specific agricultural management such as summer fallow to increase the soil moisture for the cropping season. …

    Soil Science and Plant Nutrition 51(2), 261-269, 2005-04-01

    References (26) Cited by (14)

  • Assessment of Spatial Variability of Soil and Canopy Properties in a Cassava Field

    MOHAWESH Osama , FUKUMURA Kazunari , ISHIDA Tomoyasu , YOSHINO Kunihiko

    圃場内の土壌や作物キャノピーの空間分布特性は水文過程や溶質移動現象に大きな影響を与える.本論文では,圃場における水移動現象にかかわる土壌と植生の諸変数の空間分布特性を把握することを目的とした.対象地は,タイ国北東部に位置する平坦なキャッサバ畑で,土壌は<I>Rhodic Kandiustox</I> に分類され,土性は粘土である.乾燥密度,体積含水率,LAI(葉面積指標), …

    JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 18(5), 501-509, 2005

    J-STAGE 

  • Effects of Soil Variability on Wheat Yield in a Field with Three Types of Management

    HACHE Carolina , SHIBUSAWA Sakae , SASAO Akira

    三種の異なる肥培管理を続けるほ場において, 土壌及び小麦の生育と収量の空間的ばらつきを観測した。観測された小麦のばらつきが肥培管理によるものか, それとも土壌のばらつきによるものかを解明することが本研究の目的である。さらに収量に影響する土壌パラメータを推定するため相関分析, 変数可変型線形回帰分析及び部分最小二乗法解析を行った。その結果, 3種類の解析法とも収量に対して電気伝導度は正の効果, C/ …

    JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY 66(4), 72-80, 2004-07-01

    J-STAGE  References (9) Cited by (2)

  • CONSOLIDATION INVERSE ANALYSIS CONSIDERING SPATIAL VARIABILITY AND NON-LINEARITY OF SOIL PARAMETERS

    NISHIMURA Shin-ichi , SHIMADA Kiyoshi , FUJII Hiroaki

    … The model is determined from the standard consolidation test results, and represents the non-linearity and spatial variability of the coefficient of volume compressibility and the coefficient of permeability simultaneously. … Furthermore, the inverse analysis method is proposed on the basis of the SNCM and the finite element method mixed with the Monte Carlo simulation. …

    SOILS AND FOUNDATIONS 42(3), 45-61, 2002-06-01

    J-STAGE  NDL Digital Collections  References (26) Cited by (2)

  • Spatial Variability Patterns of Wheat Growth and Soil Properties in a Small Field as Affected by Tillage Intensity

    NAKAMOTO Tomomi , YAMAGISHI Junko , OYAIZU Hiroshi , FUNAHASHI Tomoya , RICHNER Walter

    … The objective of this study was to obtain information about spatial heterogeneity as a basis for site-specific soil and crop management in small fields. …

    Plant Prod. Sci. 5(2), 175-183, 2002-06-01

    References (23) Cited by (4)

  • Abundance and Viability of the Groundwater Microbial Communities from a Borehole in the Tono Uranium Deposit Area, Central Japan

    MURAKAMI YUKI , FUJITA YUKA , NAGANUMA TAKESHI , IWATSUKI TERUKI

    … The abundance and viability of microorganisms in groundwater were studied using a scientific borehole in the Tono uranium deposit area, central Japan. … The total cell count using epifluorescence microscopy was of the order of 10<sup>5</sup> … cells ml<sup>-1</sup>, showing non-systematic change in microbial parameters with depth. …

    Microbes and Environments 17(2), 63-74, 2002-06-01

    J-STAGE  References (52) Cited by (5)

  • Spatial variability of agricultural soil parameters in southern Spain

    LOPEZ-GRANADOS F

    Plant Soil 246, 97-105, 2002

    Cited by (4)

  • Spatial Variability Patterns of Wheat Growth and Soil Properties in a Small Field as Affected by Tillage Intensity.

    Nakamoto Tomomi , Yamagishi Junko , Oyaizu Hiroshi , Funahashi Tomoya , Richner Walter

    … The objective of this study was to obtain information about spatial heterogeneity as a basis for site-specific soil and crop management in small fields. …

    Plant Production Science 5(2), 175-183, 2002

    J-STAGE 

  • 1 / 2
Page Top