計装SPTサンプラーを用いた標準貫入試験結果の自動処理システムに関する研究

金沢大学工学部研究課題/領域番号:57750417, 研究期間(年度):1982出典：研究課題「計装SPTサンプラーを用いた標準貫入試験結果の自動処理システムに関する研究」課題番号57750417（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-57750417/）を加工して作

三成分コーン貫入試験による杭支持力の経時的変化の推定

金沢大学工学部研究課題/領域番号:04750474, 研究期間(年度):1992出典：研究課題「三成分コーン貫入試験による杭支持力の経時的変化の推定」課題番号04750474（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-04750474/）を加工して作

応力波解析による杭周面摩擦特性の評価

金沢大学工学部研究課題/領域番号60750458, 研究期間(年度):1985出典：研究課題「応力波解析による杭周面摩擦特性の評価」課題番号60750458（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-60750458/）を加工して作

軟岩および破砕性と抗材料の境界摩擦特性に関する研究

金沢大学理工研究域地球社会基盤学系軟岩としては石川県能登半島に分布する「珪藻泥岩」を,破砕性土としては鹿児島県で採取した「しらす」を用いて,鋼材と土の一面せん断試験を実施した。鋼材は人工的に表面に凹凸を付けたものを計6種類準備した。その内4種類は規則的な凹凸を有しており,それぞれ最大粗度Rmaxが10μm,20μm,30μm,40μmである。珪藻泥岩では,飽和試料および乾燥試料を用いて,圧密圧力1,2,3,4,5 kgf/cm^2で圧密をした後,せん断速度0.5mm/minおよび5mm/minで10回の繰返しせん断を行った。このせん断速度の範囲では,摩擦係数に及ぼすせん断速度効果は見られなかった。また,飽和および乾燥試料の間には,鋼材との摩擦係数にほとんど差は無かった。飽和および乾燥試料とも,鋼材の.Rmaxが大きくなるほど,摩擦係数μが増加するが,ある.Rmaxを超えると,摩擦係数μの増加は見られなくなる。Rmaxが一定の場合,繰返しせん断の回数の増加と共に,摩擦係数μが増加するが,その最大値は珪藻泥岩の内部摩擦係数と同程度となった。しらすでは,数回の繰返しせん断によって急激に摩擦係数μが増加し,しらすの内部摩擦係数に達した。しらす試料の場合,一面せん断試験前後に「ふるい分け試験」を実施したが,試験後に細粒分が明らかに増加しており,粒子の破砕性が繰返しせん断に伴う急激な摩擦係数の増加に関係していることがわかった。すなわち,粒子破砕によって生じた細粒分が鋼材の凹凸に入り込み,鋼と土のせん断モードから土と土のせん断モードに変化するため,摩擦係数が土の内部摩擦係数に容易に移行していることを推察できる。Direct shear tests between soils and steel materials were conducted in this research to investigate influential factors on coefficient of friction. Diatomaceous mudstone known as a soft rock, and Shirasu sand that is a typical crushable soil were used as soil specimen. Steel plates having different surface roughness, Rmax, of 10, 30, 40gm, were prepared as pile materials. Other experimental parameters were normal pressure, cm, shear displacement rates of 2mm/mm and 20mm/mm, and number of repeated loading.Principal findings from this research are as follows :1)The shear strength at the pile-soil interface is dominated by Mohr-Coulomb criterion where shear strength is proportional to effective normal stress siguma_n.2)Coefficient of friction m is increased with number of repeated loading toward internal coefficient of friction of soil.3)This phenomenon is associated with crush of soil particles. It is presumed that finer soil particles produced by particle crush bury ditches on the pile surface so that pile-soil slip mode changes to soil-soil slip mode as crush of soil partilces is progressed.研究課題/領域番号:09650543, 研究期間(年度):1997 – 1998出典：研究課題「軟岩および破砕性と抗材料の境界摩擦特性に関する研究 」課題番号09650543（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/report/KAKENHI-PROJECT-09650543/096505431998kenkyu_seika_hokoku_gaiyo/）を加工して作

鋼管杭の支持力機構の解明-浸透力を利用した模型実験-

金沢大学助手研究課題/領域番号:03750417, 研究期間(年度):1991出典：研究課題「鋼管杭の支持力機構の解明-浸透力を利用した模型実験-」課題番号03750417（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-03750417/）を加工して作

Deforming mechanism and influential factors of giant Jinnosuke-dani landslide, Japan

Synopsis The Jinnosuke-dani landslide is a giant landslide with a scale of 2000 m in length and 500 m in width in Haku-san mountainous area, Japan. This landslide consists of alternative layers of sandstone and shale in Tetori Group that deposited from Mesozoic Jurassic period to Early Cretaceous period. Based on deformation monitoring results for more than seven years, the landslide is divided into upper block and lower block. The upper block moves at a relatively high speed (80 mm to 170 mm / year), while the lower block moves slowly (3 mm to 15 mm / year). Monitored data also show that the variation of the groundwater level has a great influence on the landslide movement. The effects of the weathering of the alternative layers of sandstone and shale on the landslide deformation were confirmed through numerical analyses

Influence of reaction piles on the behaviour of test pile in static load testing

第3回 金沢大学22世紀COEシンポジウム「環日本海域の環境計測と長期・短期変動予測」,環日本海環境戦略機構会議,国際ワークショップ「環日本海域の大気環境計測:ネットワーク形成に向けて」, COE若手研究助成金等研究成果発表会:論文要旨

Parametric study on push-up loading of sand plug in open-ended pipe pile using DEM

金沢大学理工研究域環境デザイン学系The bearing capacity of an open-ended pipe pile consists of outer shaft resistance, toe resistance and soil plug resistance (inner shaft resistance). The soil plug capacity is thought to be largely controlled by height and stress states of soil plug that is formed inside the pile during installation process. However, these aspects have not been fully clarified. In this paper, parametric study on push-up loading of soil plug was carried out using three-dimensional discrete element method for the first step to investigate the bearing mechanism of open-ended pipe pile. Influence of dilatancy of sand and the soil plug height was focused. © 2006 Taylor & Francis Group

The Effect of Prior Knowledge of Color on Behavioral Responses and Event-Related Potentials During Go/No-go Task

In daily life, the meaning of color plays an important role in execution and inhibition of a motor response. For example, the symbolism of traffic light can help pedestrians and drivers to control their behavior, with the color green/blue meaning go and red meaning stop. However, we don’t always stop with a red light and sometimes start a movement with it in such a situation as drivers start pressing the brake pedal when a traffic light turns red. In this regard, we investigated how the prior knowledge of traffic light signals impacts reaction times (RTs) and event-related potentials (ERPs) in a Go/No-go task. We set up Blue Go/Red No-go and Red Go/Blue No-go tasks with three different go signal (Go) probabilities (30, 50, and 70%), resulting in six different conditions. The participants were told which color to respond (Blue or Red) just before each condition session but didn’t know the Go probability. Neural responses to Go and No-go signals were recorded at Fz, Cz, and Oz (international 10–20 system). We computed RTs for Go signal and N2 and P3 amplitudes from the ERP data. We found that RT was faster when responding to blue than red light signal and also was slower with lower Go probability. Overall, N2 amplitude was larger in Red Go than Blue Go trial and in Red No-go than Blue No-go trial. Furthermore, P3 amplitude was larger in Red No-go than Blue No-go trial. Our findings of RT and N2 amplitude for Go ERPs could indicate the presence of Stroop-like interference, that is a conflict between prior knowledge about traffic light signals and the meaning of presented signal. Meanwhile, the larger N2 and P3 amplitudes in Red No-go trial as compared to Blue No-go trial may be due to years of experience in stopping an action in response to a red signal and/or attention. This study provides the better understanding of the effect of prior knowledge of color on behavioral responses and its underlying neural mechanisms