Acoustic emission characteristics of a dry sandy soil subjected to drained triaxial compression     

Lin  Wenli  Liu  Ang  Mao  Wuwei  Koseki  Junichi 《Acta Geotechnica》2020,15(9):2493-2506

Acoustic emission (AE) technique that is capable of diagnosing the failure process of stressed materials has rarely reported its application to sandy soils subjected to triaxial compression. In this paper, drained triaxial compression tests incorporating with a high-performance AE measurement system were conducted for dry sands with different confining stresses and initial relative densities. Generally, an increased confining stress or initial relative density generates more acoustic emissions, while there also exist exceptions due to different failure patterns. A good resemblance between stress–strain and AE hit rate–strain relations was observed, and power functions between the mechanical parameters and AE hit rate were well established regardless of different confining stresses and initial relative densities. Besides, the behavioral state of yield and peak during compression could be also evaluated by AE hit rate, compared with conventional stress–strain determination. Particularly, the peak AE hit rate is found not always synchronous to but fluctuating at around the peak stress depending on different failure patterns, which might provide beneficial insights into the incipient failure of sands. The present good consistencies suggest that AE characteristics could be used as alternative parameters to evaluate and even predict the mechanical behavior of dry sands.

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Study on a failed dip slope with a thin sandy layer in 2004 Niigata-ken Chuetsu Earthquake     

Jianliang Deng  Hiroshi Kameya  Yukika Miyashita  Jiro Kuwano  Reiko Kuwano  Junichi Koseki 《Engineering Geology》2011,123(4):302

Among the extensive failed slopes in the 2004 Niigata-ken Chuetsu Earthquake, Japan, a dip slope at Yokowatashi, Ojiya, was investigated intensively. The sliding plane was along a weak thin tuff sandy layer which had been deeply weathered. Triaxial compression tests and plane strain compression tests were performed on undisturbed specimens obtained by block sampling and boring sampling to evaluate the strength that was mobilized on the sliding plane. Stability analysis based on the test results reveals that, at normal time, without earthquake and without an extremely high groundwater level, the slope is stable. Furthermore, the calculation of earthquake-induced displacement provides a reasonable simulation of the failure of this slope.  相似文献   

Liquefaction fragility of sewer pipes derived from the case study of Urayasu (Japan)     

Baris  Anna  Spacagna  Rose Line  Paolella  Luca  Koseki  Junichi  Modoni  Giuseppe 《Bulletin of Earthquake Engineering》2021,19(10):3963-3986

Bulletin of Earthquake Engineering - The damage on supply and drainage water networks is a serious cause of economic disruption for urban systems affected by earthquakes. Among various concerns,...  相似文献   

On the impact of atmospheric vs oceanic resolutions on the representation of the sea surface temperature in the South Eastern Tropical Atlantic     

de la Vara  Alba  Cabos  William  Sein  Dmitry V.  Sidorenko  Dmitry  Koldunov  Nikolay V.  Koseki  Shunya  Soares  Pedro M. M.  Danilov  Sergey 《Climate Dynamics》2020,54(11-12):4733-4757

Climate Dynamics - Despite the efforts of the modelling community to improve the representation of the sea surface temperature (SST) over the South Eastern Tropical Atlantic, warm biases still...  相似文献