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中文摘要：
在黄河口潮坪选择典型研究区进行振动试验，通过实时孔压监测、静力触探测试、十字板剪切测试及原状样土工测试对比，研究黄河口粉质土重复液化发生过程和液化后土体物理力学指标的变化特点，找出了液化过程中，硬壳层发育处土体的孔压和强度变化规律。研究发现：液化主要发生在硬壳层，表现为孔压迅速升高，土体强度降低；硬壳层上、下的土体，在循环荷载作用下强度均有所提高，上层土体强度提高相对显著，且表面发育一系列微型“泥火山”；循环荷载导致的孔压上升呈突变特征，循环荷载停止后孔压的消散呈渐变趋势；随着荷载循环次数增加，液化发生层深度向下扩展；粉质土灵敏度随循环荷载作用发生改变。循环荷载反复作用后土体多种指标变化特性沿深度具有显著差异性。
英文摘要：
The in-situ vibrating test on silt was carried out in the tidal flat of the Yellow River estuary.The pore water pressure measurement, cone penetration tests and vane shear tests were conducted. The contrast tests of undisturbed silt samples were done in laboratory to study the changes of silt properties.The variation law of pore pressure and strength in the crust layer in the process of liquefaction were studied. The results indicate that liquefaction is always taking place at the crust layer exhibiting the increase of pore pressure and reduction of strength. The strength of silt both above and beneath the crust layer increases. The pore pressure changes abruptly during the action of cyclic loading and tends to dissipate when loading is stopped. Following the increase of cyclic number the depth of liquefaction layer tends to increase. The physical and mechanical indices of silt changed after the action of cyclic load and vary remarkably along the depth.
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