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Collaborating Authors
Results
ABSTRACT The present study was performed in order to understand the effect of soil compressibility and crushability on the monotonic and cyclic undrained strength of soils. Aio sand which is a beach sand from Yamaguchi prefecture in the south-west of Honshu in Japan was used for triaxial tests preparing with a particle size distribution of 2mm down to 74gin. The triaxial specimens of 50ram diameter and 100ram height were air pluviated to a relative density of 80%. The Samples were isotropically consolidated at mean normal effective stresses of 0.1MPa, 1MPa, 3MPa and 5MPa. Monotonic triaxial shear tests were carried out at confining pressures of 100kPa, 1Mpa, 3MPa and 5Mpa while cyclic triaxial tests were carried out at confining pressures of 100kPa, 3MPa and 5MPa. Further many sieving tests were performed at several stage of shearing by terminating the triaxial tests to determine the degree of particle breakage. The fines content was increased due to particle crushing even during undrained shear process in which the effective stress decreased. It was noted that the undrained shear behaviour was greatly dependent on the particle crushing of sands. INTRODUCTION In 1964 during the Niigata earthquake there was widespread damage due to liquefaction. This led to a large research effort on the liquefaction properties of silica sands. However in 1995 during the Great Hanshin Earthquake serious damage occured to port and harbour facilities such as Kobe Port Island and Rokko Island. Both of these were areas of reclaimed land filled with a crushable residual granite soil, Masado. In 1997 during the Kagoshima-ken Hokuseibu earthquake, the liquefaction of a crushable volcanic soil, Shirasu, was observed. Further many sieving tests were performed at several stage of shearing by terminating the triaxial tests. Variation of particle distribution curve was observed in both consolidation and shearing process.
- Asia > Japan > Chūgoku > Yamaguchi Prefecture (0.24)
- Asia > Japan > Kyūshū & Okinawa > Kagoshima Prefecture > Kagoshima (0.24)
- Asia > Japan > Chūbu > Niigata Prefecture > Niigata (0.24)
ABSTRACT In this study, the reclaimed soil in Yun-Lin offshore area in west Taiwan is adopted as testing samples. By moist tamping method, the specimens were prepared with different relative densities and fines contents. A series of cyclic triaxial test was performed to investigate the liquefaction induce deformation and settlement of reclaimed soil under earthquake loading. In order to evaluate the effects of pre- cyclic loading on strength resistance of reclaimed soil, the properties of stress and strain are discussed. Based on one-dimensional consolidation theory, the liquefaction induced volumetric changes can be transformed to evaluate the dynamic settlement of reclaimed soil. As shown in the test results, under same fines content, the settlement ratio decreases as the relative density increases. As for same relative density, the settlement ratio increases as the fines content increases. An evaluation method is proposed and can be used to predict the liquefaction induce dynamic settlement in reclamation area. INTRODUCTION Hydraulic sand fill is one of the most important reclamation method in West Taiwan. The reclaimed land is important for the development of industrial estate. The filled materials for hydraulic sand fill were obtained from the seabed or river mouth by used of cutter. Pressure tubes and transportation ship were used to transport the filled material to the reclamation area. By understanding the mechanisms of reclaimed soil, the reclamation in the coastline can be improved. The effects of earthquake and wave forces were considered as the main factors affecting the stability of reclamation area. The purpose of this study is to assess the stability of the reclamation area by evaluating the liquefaction potential of reclaimed soil. The basic properties of reclaimed soil are low strength, low relative density and low SPT-N values with high water contents. Therefore, the reclaimed soil would easily liquefied under earthquake loading.