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K. Yasuhara
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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AN OBSERVATIONAL PREDCTION OF LAND SUBSIDENCE FOR A GIS-AIDED MONITORING SYSTEM OF GROUNDWATER LEVEL S. Murakami; K. Yasuhara; N. Mochizuki
Lowland Technology International Vol 4 No 1, June (2002)
Publisher : International Association of Lowland Technology

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Abstract

A simplified method for observational prediction of land subsidence based on settlement versus time records being previously observed at locations of the objective area was proposed in the present paper for use of the geographical information system (GIS). However, no consideration of ground water level (GWL) variations was taken into proposal of the method. The present paper, however, attempts to realize use of this time series analysis. Settlement variations over time predicted using the proposed two methods available for cases with and without consideration of GWL fluctuation were compared with those observed at locations in the objective area. In comparison with a method which ignores GWL fluctuation, better agreement was recognized between predicted and measured settlement versus relations. In particular, it was found that the proposed method succeeds in predicting settlemet acceleration over time during water shortage periods. Results predicted using the proposed method are displayed as a hazard map using the GIS. Based on the GIS application map, a possible monitoring system is presented for groundwater usage optimization.
NORMALIZATION OF STRESS-STRAIN CURVES FROM CRS CONSOLIDATION TEST AND ITS APPLICATION TO CONSOLIDATION ANALYSIS K. Suzuki; K. Yasuhara
Lowland Technology International Vol 7 No 1, June (2005)
Publisher : International Association of Lowland Technology

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The results of Constant Rate of Strain (CRS) consolidation test carried out at 0.02 %/min are normalized in order to produce stress-strain curves corresponding to strain rates slower than 0.02%/min. The normalizing procedure consists of two steps: 1) define the curve corresponding to OCR=1, and 2) normalize the difference between the curves defined in the first step and that directly obtained from CRS test. The resulting stress-strain curves are applied to the consolidation analysis of a marine clay deposit loaded by a test embankment. The comparison between the observed field behavior and the consolidation analysis presented here suggests that the normalizing procedure demonstrated the usefulness of CRS consolidation test in consolidation analysis.
Instability of residences founded on volcanic cohesive soils during the 2016 Kumamoto Earthquake K. Yasuhara; H. Watanabe; K. Kobayashi; M. Yoshimi; Y. Arai; S. Hosoya; M.S. Tajiri; S. Murakami
Lowland Technology International Vol 19 No 3, Dec (2017)
Publisher : International Association of Lowland Technology

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This paper is intended to describe that the nonlinearity of seismic response for soft deposits is associated with the cyclic degradation of strength and stiffness in shallow deposits of cohesive volcanic ash soils, which caused devastation to residences. Using the simplified methodologies proposed previously by the authors, which incorporate cyclic strength and stiffness degradation characteristics of saturated cohesive soils, prediction was conducted for residential settlement and lateral deformation of residences with retaining walls founded on and against a shallow layer of cohesive volcanic ash soils. A chart for construction management incorporating the results in terms of earthquake-induced settlement vs. lateral deformationsettlement relations predicted the use of the methodology described above. Results suggest that residences are likely to sustain severe damage when the normalized excess pore pressures generated during the earthquake extend to about 0.7. Results also show that damage to retaining walls was also associated with earthquake-induced strength degradation of backfill soils.
Co-Authors H. Watanabe K. Kobayashi K. Suzuki M. Yoshimi M.S. Tajiri N. Mochizuki S. Hosoya S. Murakami Y. Arai