Liquefaction Characteristics of Saturated Coral Sand Under Anisotropic Consolidations

Abstract

AbstractA series of undrained cyclic triaxial tests were conducted on saturated coral sand by using GDS dynamic traixial apparatus. This research mianly investigates the characteristics of excess pore water pressure (ue), axial strain (εa), stress-strain relationship and liquefaction resistance of coral sand under different consolidation ratios (R) and cyclic stress ratios (CSR). The test results indicate that for the specimens under anisotropic consolidations, the development of pore water pressure always show the trend from fast to slow, and eventually tends to be stable. Two development modes of axial strain can be found in saturated coral sand: cyclic mobility and plastic cumulative deformation. The stress-strain relationships of saturated coral sand under isotropic and anisotropic consolidations are quite different, and the difference could be associated with stress reversal. The relation of static deviatoric stress (qs) and cyclic deviatoric stress (qd) plays an important role in liquefaction characteristics. Compared with the Fujian sand, the saturated coral sand has higher liquefaction resistance due to the special physical properties. The liquefaction resistance of saturated coral sand increased with the increasing of consolidation ratio.KeywordsCoral sandConsolidation ratiosExcess pore water pressureAxial strainLiquefaction resistance