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Yasuhara, Hideaki,Kinoshita, Naoki,Ogata, Sho,Cheon, Dae-Sung,Kishida, Kiyoshi Elsevier 2016 International journal of rock mechanics and mining Vol.86 No.-
<P><B>Abstract</B></P> <P>A coupled THMC numerical model has been developed to examine the long-term change in permeability of the porous sedimentary rocks that are assumed to be composed purely of quartz. Specifically, the chemo-mechanical process of the pressure solution was incorporated into the model. The developed model was validated by replicating the existing experimental measurements of the porosity reduction and the evolving silica concentration. Subsequently, by simulating the burial of high-level radioactive wastes in the deep subsurface, namely, by applying the simulated confining pressure and temperature conditions, the long-term evolution of the rock permeability was predicted. The model predictions clearly showed a significant influence of the pressure dissolution on the change in permeability with time. The predicted permeability of the rocks close to the wastes decreased by one order of magnitude in 10<SUP>4</SUP> years when considering the pressure dissolution, while the permeability changed little during the same period when the pressure dissolution was not considered. This reduction should delay the dispersion of the radioactive materials dissolved in the groundwater.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A coupled THMC numerical model was developed to predict the long-term change in permeability. </LI> <LI> The developed model considers the pressure solution. </LI> <LI> The model was validated by replicating the existing experiments. </LI> <LI> The model enables the evolution of rock permeability to be predicted under arbitrary pressure and temperature conditions. </LI> </UL> </P>
Masaki Yasuhara 한국생성문법학회 2016 생성문법연구 Vol.26 No.2
Passives and anti-causatives share the same morphology in many languages. In Greek, they are both marked by non-active morphology. This isomorphism has been accounted for by positing the Voice head in both the isomorphic passive and anti-causative structures. This paper shows that the isomorphism between passives and anti-causatives exists in Japanese as well and that the same analysis holds of Japanese as well. Further, I show that Japanese isomorphic anti-causatives denote externally caused events. It has been proposed by previous studies that there is a parametric variation with regard to the availability of the causative alternation of externally caused event verbs. Languages that allow anti-causatives of externally caused events employ specifier-less Voice. Following the theoretical assumptions of the previous studies, I argue that the suffix shared by the isomorphic verbs in Japanese is an overt realization of specifier-less Voice. This study supports the empirical validity of positing specifier-less Voice from a comparative perspective.
벤더엘레먼트와 단순전단시험에 의한 비소성실트의 강성 비교
송병웅,Yasuhara Kazuya,Sakamoto Wataru,이제우 한국지반환경공학회 2007 한국지반환경공학회논문집 Vol.8 No.1
최근 지진에 의한 액상화 피해를 입은 지역에서의 조사결과에 의하면 모래지반 뿐만 아니라 세립분을 함유한 흙 또는 비소성실트 지반에서도 액상화 피해사례가 보고되고 있으나, 지금까지 액상화는 느슨한 포화 모래지반에서 발생하는 것으로만 알려져 비소성실트의 액상화특성에 대하여 거의 알려져 있지 않다. 특히, 액상화강도는 전단탄성파속도와 밀접한 관계가 있어 현장에서는 PS검층 등을 이용하여 원위치에서 흙의 강성을 조사하며, 실내 실험에서는 정확한 흙의 강성을 조사하기 위하여 벤더엘레먼트를 이용한다. 본 연구에서는 단순전단시험기에 벤더엘레먼트를 장착하여 비소성실트의 강성을 조사하였으며 단순전단시험 결과와 비교하였다. 그 결과 벤더엘레먼트에 의한 비소성실트의 강성은 단순전단시험결과보다 약간 크게 나타나지만 그 차이는 적으며, 점토의 강성보다 작은 것을 알 수 있었다. Recent investigations into earthquake-induced damage have reported that liquefaction may take place on not only sands but also fine-contained soils or non-plastic silts. Although not a few study has been performed to understand the liquefaction of sands, relatively little effort has been devoted to improving our understanding of the liquefaction characteristics for non-plastic soils. Given that liquefaction strength is largely associated to shear wave velocity, bender element test as well as direct simple shear test is employed to examine the stiffness of non-plastic silt more precisely. Through the soil tests, the stiffness of non-plastic silts from the bender element tests is identified as slightly greater than that from the direct simple shear test. Further, the stiffness of non-plastic silts appears to be smaller than that of clay.