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| | Abstract | | As a part of the Mid Line Project of China South to North Water Diversion, an emergency water supply reservoir is planned to be constructed in the west of Tianjin City. Since the Tangshan Earthquake in 1976 caused serious ground liquefaction in Tianjin area, an effective ground investigation method is required to provide information for liquefaction countermeasures. The authors conducted over 12km surface wave survey (SWS) along the axis of the embankment of the reservoir, and estimated soil compositions of the ground from shear wave velocities that is the result of SWS with help of drilling information. The result shows that the shear wave velocity of sand/silt or sandy loam is over 120m/s while that of clay is below 120m/s. Furthermore, based on the liquefaction strength obtained from laboratory test of the core samples, we divided the ground in 3 types: Type A: consisted of sand/silt or sandy loam, suffers high liquefaction danger, Type B: consisted of clay, suffers low liquefaction danger, and Type B': consisted of sand/silt or sandy loam with thin or un-continuous clay layer, suffers medium liquefaction danger. |
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