Search Results 1-20 of 67

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  • Dissipated energy verification on silica sand and volcanic sandy ash soil Shirasu with chemical grouting and compaction under triaxial cyclic behavior  [in Japanese]

    KIYOHARA Yukoh

    … <p>Saturated and unsaturated shearing behavior on sand, Shirasu, which is volcanic ash sand with pumice, and improved Shirasu (cement, chemical grouted and well compacted Shirasu) were investigated to valuate earthquake proof performance by cyclic triaxial test. … Improved soils became tough, reduced excess pore water pressure by positive dilatancy, and required more dissipated energy to reach 2.5% of single amplitude strain. …

    Japanese Geotechnical Journal 15(1), 15-24, 2020

    J-STAGE 

  • Laboratory Test and Numerical Simulation about Unsaturated Liquefaction Characteristics of Volcanic Sandy Soil  [in Japanese]

    MATSUMARU Takaki

    … <p>In recent earthquakes, slope failure occurred with muddy collapse and flow at gentle slopes made of volcanic sandy soil. … It seemed that the volcanic sand would be liquefied even in unsaturated condition in these damages. … In this study, the unsaturated tri-axial tests using two kinds of volcanic sandy soils were conducted under the different initial conditions of suction and degree of saturation. …

    Journal of Japan Association for Earthquake Engineering 20(1), 1_37-1_50, 2020

    J-STAGE 

  • Effect of grain-size distribution on hydraulic anisotropy of unsaturated soils

    Rahardjo H. , Satyanaga A.

    … <p>As slope failures induced by rainfall are universal problems, especially in areas covered by residual soils, slope preventive system is necessary to avoid casualties. … One effectively-proven alternative method is capillary barrier system (CBS) which utilizes the principles of unsaturated soil mechanics to minimize rainwater infiltration into soil layer. …

    Japanese Geotechnical Society Special Publication 7(2), 376-381, 2019

    J-STAGE 

  • Performance of filter gabion with pipe as a simple countermeasure against slope failures due to torrential rainfalls

    Cho May Than Thar , Chueasamat Anusron , Saito Hirotaka , Kohgo Yuji

    … The surface layers normally consist of sand or sandy soils. … The investigations were conducted by using the saturated and unsaturated consolidation analysis method with an elastoplastic model considering two suction effects. …

    Japanese Geotechnical Society Special Publication 7(2), 223-233, 2019

    J-STAGE 

  • Effects of inherent anisotropy on G0 of unsaturated sand

    Le B. N. , Toyota H. , Takada S.

    … <p>Inherent anisotropy, resulted from sediment process, is an important aspect when considering the behavior of sandy soils. … The experimental results obtained on both saturated and unsaturated sands indicate that G0 was affected by depositional angle of the specimen. … Moreover, those results showed greater G0 on unsaturated sand than that on saturated sand because of the application of matric suction.</p> …

    Japanese Geotechnical Society Special Publication 7(2), 102-109, 2019

    J-STAGE 

  • PROPOSAL OF A SIMPLIFIED METHOD TO EVALUATE AND VERIFY THE ESSENTIALLY SATURATED ZONE IN SANDY BEACHES AND TIDAL FLATS  [in Japanese]

    YANG Soonbo , SASSA Shinji , KAJIHARA Naoto , WATANABE Keita

    … 100%) and unsaturated zone in all of the exposed sandy beaches. … In natural tidal flats, there are the essentially saturated zones in most of the exposed sediment deposits at the time of low tide, whereas in artificial tidal flats, they may contain unsaturated zones. … From the viewpoint of the stability of coastal geo-environments and the conservation of rich ecosystems, it is important to identify the essentially saturated zone in sandy beaches and tidal flats. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73(2), I_636-I_641, 2017

    J-STAGE 

  • CYCLIC UNDRAINED TRIAXIAL TESTS FOR LIQUEFACTION STRENGTH AND DEFORMATION PROPERTIES OF SATURATED AND UNSATURATED NINOHE SHIRASU  [in Japanese]

    KIYOHARA Yukoh

    …  Mudflow of earthfill composed of volcanic porous sandy soil called Ninohe Shirasu occurred during the 2011 Tohoku earthquake under high water content conditions. … After sampling the soil and remolding it, cyclic undrained triaxial tests for liquefaction strength and deformation properties were conducted under saturated and unsaturated conditions. … Not only saturated soil but also unsaturated soils were liquefied. …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 72(3), 196-203, 2016

    J-STAGE 

  • Soil-water-air coupled seismic behavior accompanying internal water level variation of an unsaturated embankment with an enclosed saturation area on cohesive soil ground

    Noda Toshihiro , Yoshikawa Takahiro , Takaine Toshihiro

    … Conventionally, seismic damage to river dykes had been thought to be caused mainly by the liquefaction of sandy foundation grounds. … For interpretation/realization of the collapse mechanism through numerical analysis, it is essential not only to handle both saturated and unsaturated conditions seamlessly but also to carry out static/dynamic analyses and finite deformation analyses for simulating the processes of enclosed saturation area formation due to consolidation settlement and the subsequent dyke collapse. …

    Japanese Geotechnical Society Special Publication 2(18), 670-675, 2016

    J-STAGE 

  • INFLUENCE OF DRY DENSITY AND WATER CONTENT IN UNSATURATED SANDY SOIL ON THE ESTIMATION OF SESMIC GROUND SETTLEMENT  [in Japanese]

    KITAZUME Takashi , GOTO Satoshi , ARAKI Kohei , SATO Hiroshi , SATO Masayuki

    …  With the help of some stress-controlled torsional cyclic shear tests, we determined volumetric strain of unsaturated sandy soils subject to cyclic shear under exhaust drainage conditions. …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 71(4), I_953-I_962, 2015

    J-STAGE 

  • Cyclic triaxial tests on saturated/unsaturated iron ore fines and sandy soils.  [in Japanese]

    KOSEKI Junichi , WANG Hailong , SATO Takeshi , MIYASHITA Yukika

    … In order to investigate the liquefaction properties of iron ore fines and sandy soils under saturated and unsaturated conditions, a series of cyclic triaxial tests was conducted. … Their liquefaction resistances under unsaturated condition were higher than those under saturated condition. …

    SEISAN KENKYU 66(6), 569-572, 2014

    J-STAGE 

  • VOLUMETRIC COMPRESSION CHARACTERISTICS OF UNSATURATED SANDY SOILS UNDER CYCLIC SHEAR FOR ESTIMATION OF SETTLEMENT  [in Japanese]

    北爪 貴史 , 酒井 俊朗 , 佐藤 博 , 佐藤 正行

    …  A method is presented for assessing the amount of settlements at the surface of the unsaturated backfill, by using the relationships between shear stresses, shear strains and volumetric strains, obtained from stress-controlled torsional cyclic shear tests under drained conditions. …

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 68(2), 410-421, 2012

    J-STAGE 

  • Nutrients transport through variably structured soils

    MAHMOOD-UL-HASSAN Muhammad , RASHID Muhammad , RAFIQUE Ejaz

    … Soil structure development has a direct and indirect relation with hydraulic properties that generally control the transport of surface applied nutrients in unsaturated zones causing environmental implications. …

    Soil science and plant nutrition 57(2), 331-340, 2011-04-01

    DOI  References (56)

  • Influence of temperature rise under undrained condition on the shear behavior of unsaturated sandy soil:Experiment considering solubility of gaseous components  [in Japanese]

    Kazama Motoki , Katsuno Yusaku , Mori Tomohiro , Uzuoka Ryosuke

    … Both monotonic and cyclic shear strength of unsaturated soils are significantly affected by an initial effective stress condition and a degree of saturation. … In this paper, we have studied influence of temperature change under closed condition on the shear behavior of unsaturated sandy soil experimentally. …

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 60(0), 47-47, 2011

    J-STAGE 

  • MONOTONIC AND CYCLIC BEHAVIOR OF UNSATURATED SANDY SOIL UNDER DRAINED AND FULLY UNDRAINED CONDITIONS

    KIMOTO SAYURI , OKA FUSAO , FUKUTANI JUNYA , YABUKI TAICHI , NAKASHIMA KOUSUKE

    … Changes in air pressure during monotonic and cyclic loading are in some cases important for the behavior of unsaturated soil. … In the present study, we carried out a series of monotonic and cyclic loading tests on sandy soil used for the improvement of river embankments. …

    SOILS AND FOUNDATIONS 51(4), 663-681, 2011

    J-STAGE 

  • MODEL TEST AND CONSOLIDATION ANALYSIS OF FAILURE OF A LOOSE SANDY EMBANKMENT DAM DURING SEEPAGE

    HORI TOSHIKAZU , MOHRI YOSHIYUKI , KOHGO YUJI , MATSUSHIMA KENICHI

    … Failures of earth dam embankments and river dikes, which are constructed of sandy soils with low dry densities, have been observed to occur during rising of water levels. … The test results were simulated by use of a consolidation analysis method coupled with an elastoplastic model for unsaturated soils. …

    SOILS AND FOUNDATIONS 51(1), 53-66, 2011

    J-STAGE 

  • EFFECTS OF DRY DENSITY AND GRAIN SIZE DISTRIBUTION ON SOIL-WATER CHARACTERISTIC CURVES OF SANDY SOILS

    GALLAGE CHAMINDA PATHMA KUMARA , UCHIMURA TARO

    … The soil-water characteristic curve (SWCC) of soil plays the key roll in unsaturated soil mechanics which is a relatively new field of study having wide applications particularly in Geotechnical and Geo-environmental Engineering. …

    SOILS AND FOUNDATIONS 50(1), 161-172, 2010

    J-STAGE 

  • Assessment of the Use of Hand Warmer for Nitrate Retardation in Porous Media

    INOUE Kazuya , IHARA Ikko , YOSHINO Akari , TANAKA Tsutomu

    … Under saturated and unsaturated flow conditions, column experiments with a pulse source of potassium nitrate solution were conducted in silica sand and Andisols with a mixture of HWCs. … The results of column experiments showed that the increase in the amount of HWCs added resulted in the increase of the first two temporal moments and retardation factor in both soils, particularly in silica sand. …

    Journal of Water and Environment Technology 8(4), 355-362, 2010

    J-STAGE  Cited by (1)

  • Determination of Soil-Water Characteristic Curves of Unsaturated Sandy Soils Using Membrane Filter with Stainless Wire Mesh

    Alim Md. Abdul , Nishigaki Makoto , Chegbeleh Larry Pax , Akudago John Apambilla , Komatsu Mitsuru

    … Soil-water characteristic curve (SWCC) is an important soil function in an unsaturated soil mechanics field for design and analyses of any unsaturated earth structures. … However, experience shows, it has disadvantage of breakage after one time use especially with coarse grain soils (sandy soils). … Results showed that membrane filter with stainless wire mesh can be used to determine the SWCC for coarse grain soils. …

    岡山大学環境理工学部研究報告 14(1), 13-16, 2009-03-16

    IR  DOI 

  • Determination of soil-water characteristic curves of unsaturated sandy soils using membrane filter with stainless wire mesh

    Alim Md. Abdul , Nishigaki Makoto , Chegbeleh Larry Pax [他]

    Journal of the Faculty of Environmental Science and Technology, Okayama University 14(1), 13-16, 2009-03

  • NON-DESTRUCTIVE MEASUREMENTS OF UNSATURATED SEEPAGE FLOW BY USING GROUND-PENETRATING RADAR  [in Japanese]

    TAKESHITA Yuji , MORIKAMI Shinya , MORITA Syuzo , KURODA Seiichiro , INOUE Mitsuhiro

    …   The potential of surface ground-penetrating radar (GPR) for measuring unsaturated seepage flow in sandy soils was evaluated. … It is shown from field infiltration experiments performed in homogeneous unsaturated dune sands. … There was good agreement between computed and measured wetted zone movements in two-dimensional unsaturated seepage flow. …

    Doboku Gakkai Ronbunshuu C 65(4), 943-950, 2009

    J-STAGE 

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