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Use of groundwater flow model in the analysis of a creeping landslide in western Japan

Episodes 2006年第1期29卷 20-25页

作者： H.K. Shrestha R. Yatabe n.p. bhandary Graduate School of Science and Engineering Ehime University Japan. Faculty of Engineering Ehime University Japan.

To predict the movement of an existing creeping landslide, monitoring and analysis of hydrological parameters are crucial This paper analyses the hydrological parameters of an existing creeping landslide site in western Japan. The groundwater flow and resulting fluctuation in.p.re water pressure at the slip layer of a sliding block was simulated using a groundwater flow model. A quasithree-dimensional factor of safety of the block was obtained by combining the groundwater model with slope stability analysis methods. The results show that for prediction.p.rposes at a creeping landslide site the time series analysis using longterm data is of limited use, because the fluctuations of ground surface movement and hydrological parameters are not completely synchronized when the factor of safety of the slope soil is in the creep movement range. The ground surface movement rate dropped after each episode of relatively big movement, even when the hydrological parameters were constant. The factor of safety of the sliding block was more influenced by groundwater recharge from the hills than by rainfall. pore water pressure fluctuation obtained from groundwater flow model resulting from specific rainfall events indicated better relations between fluctuations in.p.re water pressure and ground surface movement.

关键词：日本滑坡地下水流动模型动力地质

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A study of local amplification effect of soil layers on ground motion in the Kathmandu Valley using microtremor analysis

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Earthquake Engineering and Engineering Vibration 2012年第2期11卷 257-268页

作者： paudyal Y.R. Yatabe R. bhandary n.p. Dahal R.K. Geo-disaster Research Laboratory Graduate School of Science and EngineeringEhime UniversityEhimeMatsuyamaJapan

past researchers have anticipated the occurrence of a great earthquake in the central Himalayas in the near *** may cause serious damage in the Kathmandu Valley,which sits on an ancient lake bed zone,with lacustrine sediments of more than 500 m *** this study,the predominant frequency of ground motion is evaluated using the Horizontal-to-Vertical (H/V) spectral ratio technique and recordings of ambient *** results of the H/V ratio show two peaks in about 20 percent of the locations,which are distributed mainly in and around the center and northern.p.rt of the Kathmandu *** predominant frequencies vary from 0.5 Hz to 8.9 Hz in the study area,whereas the second resonance fiequency varies from 4 Hz to 6 Hz in the center and northern.p.rt of the *** indicates that the center and northern.p.rt of the valley have a wide range of resonance frequency due to two levels of impedance contrast- one may be from the surface layer and the other may be from the layer *** two levels of resonance indicate the importance of considering the effects of surface and lower layers during the planning and designing of infrastructures in the Kathmandu Valley.

关键词： microtremor predominant frequency resonance Kathmandu Valley

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