{"title":"Time prediction of an onset of shallow landslides based on the monitoring of the groundwater level and the surface displacement at different locations on a sandy model slope","authors":"K. Sasahara, T. Ishizawa","doi":"10.3208/JGS.11.69","DOIUrl":"https://doi.org/10.3208/JGS.11.69","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115458937","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}
In seismic response analysis of soft ground, there are two analysis methods in time domain and frequency domain. The analysis method in frequency domain, represented by SHAKE, has been used for years in seismic design because of its convenience and being able to do the pull-back calculation of seismic wave and the waveform separation. It is also known that the nonlinearity of the soils in frequency domain cannot be reproduced accurately by equivalent linearization technique. Besides, the limitation of its application in finite deformation scheme is also well-known. It has been tried to solve this shortcoming of the equivalent linearization technique by changing the stiffness of the soil based on the maximum strain during the whole vibration time, the so-called the concept of the effective strain. Unfortunately the efforts did not bring a complete solution to the problem up till now. Therefore, in this paper, the method of breaking a seismic motion into a number of pulses, and using each of the pulses for the seismic response analysis of soft ground in frequency domain is proposed to deal with the nonlinear seismic behavior in time domain. As a verification of the new technique, the vertical array seismometry records and reproduction analysis of the revetment dynamic experiment were carried out and good agreement was confirmed.
{"title":"New method for nonlinear seismic analysis in time domain using frequency analysis with superposition of pulse waves","authors":"H. Nagasaka, Yoshihito Tanaka, Ho Cho","doi":"10.3208/JGS.11.377","DOIUrl":"https://doi.org/10.3208/JGS.11.377","url":null,"abstract":"In seismic response analysis of soft ground, there are two analysis methods in time domain and frequency domain. The analysis method in frequency domain, represented by SHAKE, has been used for years in seismic design because of its convenience and being able to do the pull-back calculation of seismic wave and the waveform separation. It is also known that the nonlinearity of the soils in frequency domain cannot be reproduced accurately by equivalent linearization technique. Besides, the limitation of its application in finite deformation scheme is also well-known. It has been tried to solve this shortcoming of the equivalent linearization technique by changing the stiffness of the soil based on the maximum strain during the whole vibration time, the so-called the concept of the effective strain. Unfortunately the efforts did not bring a complete solution to the problem up till now. Therefore, in this paper, the method of breaking a seismic motion into a number of pulses, and using each of the pulses for the seismic response analysis of soft ground in frequency domain is proposed to deal with the nonlinear seismic behavior in time domain. As a verification of the new technique, the vertical array seismometry records and reproduction analysis of the revetment dynamic experiment were carried out and good agreement was confirmed.","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121686865","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":"Basic Study on Frost Susceptibility of Rock","authors":"D. Nakamura, T. Goto, N. Mori, Teruyuki Suzuki, M. Hiramatsu","doi":"10.3208/JGS.1.131","DOIUrl":"https://doi.org/10.3208/JGS.1.131","url":null,"abstract":"本研究は，2種類の凍上試験で構成されている。一つは不攪乱の岩石供試体を用いた凍上試験，もう一つは人工的に破砕した引張強度を持たない岩石供試体を用いた凍上試験である。不攪乱の岩石供試体の凍上試験は，その凍上性を調べるために行われた。凍上試験の結果，大谷石と来待砂岩を凍上性岩石，札幌軟石を非凍上性岩石に分類することができた。また，凍上性岩石と非凍上性岩石の物性値について比較を行い，いくつかの明らかな違いがあることがわかった。人工的に破砕した岩石供試体の凍上試験は，破砕の影響を調べるために行われた。試験には，地盤工学会で定められた土の凍上性を判定するための試験方法を適用した。凍上試験の結果，岩石の凍上性は破砕によって増幅されることが明らかになった。また，非凍上であった岩石が破砕によって凍上を起こすようになることも明らかになった。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123064933","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":"Considerations on hazard prediction method with rainfall index in the case of 2014 Hiroshima landslide disaster","authors":"T. Tsuchida, T. Moriwaki, Kenji Tanaka, S. Nakai","doi":"10.3208/jgs.11.53","DOIUrl":"https://doi.org/10.3208/jgs.11.53","url":null,"abstract":"","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"234 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":"121097188","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 impact assessment of pH and organic nutrient source in solvents for production of bio-cover soil due to microbe metabolism","authors":"T. Mukunoki, Tomoaki Yoshinaga, S. Kawasaki","doi":"10.3208/JGS.5.69","DOIUrl":"https://doi.org/10.3208/JGS.5.69","url":null,"abstract":"バイオカバーソイルとは，バイオグラウト工法を応用して最終処分場内で供給可能なカルシウム源と土壌中の微生物代謝で発生する二酸化炭素によって覆土内において炭酸カルシウムを析出させ，既存の覆土よりも透水性の低下と強度増加を見込んだ新しい覆土材料である。本研究では，最終処分場におけるバイオカバーソイルの生成を想定して，pH環境と有機栄養源をパラメーターとしたバイオグラウトの生成実験を実施し，各条件における炭酸カルシウムの析出状況を考察した。その結果，バイオカバーソイルの生成には溶媒あるいは母材にpHの緩衝能力が不可欠であること，有機栄養源は分子構造が単純なものであれば24時間以内で分解され，炭酸カルシウムの析出反応が終了することが明らかとなった。また，バイオカバーソイルの一軸圧縮強度は供試体の乾燥が促進すると生成直後の強度に対し最大20倍の強度が得られ，透水係数は少なくとも10分の1に低下することが明らかとなった。","PeriodicalId":246019,"journal":{"name":"Jiban Kogaku Janaru (japanese Geotechnical Journal)","volume":"55 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":"121103361","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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