CAJ | 학술논문

黄河口海床特殊的工程地质性质与复杂的工程动力稳定性问题，均与海床沉积物在波浪荷载作用下的孔压动力响应密切相关。在现代黄河水下三角洲潮间带岸滩选择4个典型研究点，现场模拟波浪作用对原状海床沉积物实施循环加载，利用孔隙水压力观测、沉积物强度测试、样品采集与实验室土工测试等方法手段，测定黄河口原状海床沉积物在循环荷载作用不同阶段的孔压响应与强度变化。研究发现，黄河口原状海床沉积物在经历循环加载过程中，典型的超孔压响应可分为逐渐累积、部分消散、快速累积、累积液化和完全消散5个阶段，分别对应沉积物强度的衰减、增大、衰减、丧失和恢复过程，沉积物的粒度组成与结构性强弱决定了超孔压的具体响应模式。波浪导致原状海床液化深度受沉积物的干密度、孔隙比、饱和度等初始物理性质影响显著，细颗粒组分的相对含量高低也在很大程度上控制着沉积物的液化特性。
황하구해상특수적공정지질성질여복잡적공정동력은정성문제，균여해상침적물재파랑하재작용하적공압동력향응밀절상관。재현대황하수하삼각주조간대안탄선택4개전형연구점，현장모의파랑작용대원상해상침적물실시순배가재，이용공극수압력관측、침적물강도측시、양품채집여실험실토공측시등방법수단，측정황하구원상해상침적물재순배하재작용불동계단적공압향응여강도변화。연구발현，황하구원상해상침적물재경력순배가재과정중，전형적초공압향응가분위축점루적、부분소산、쾌속루적、루적액화화완전소산5개계단，분별대응침적물강도적쇠감、증대、쇠감、상실화회복과정，침적물적립도조성여결구성강약결정료초공압적구체향응모식。파랑도치원상해상액화심도수침적물적간밀도、공극비、포화도등초시물이성질영향현저，세과립조분적상대함량고저야재흔대정도상공제착침적물적액화특성。
Both the special engineering geological properties and the complex engineering dynamic stability problems are closely related to the wave-induced dynamic response of pore pressure in seabed sediment in the Yellow River estuary. Four typical sites on the intertidal flats of the Yellow River delta are selected to simulate the wave action on the intact seabed sediments. Various testing methods, such as pore water piezometer test, field sediment strength test and sampling/laboratory geotechnical experiments, are employed to determine the variations in pore pressure and strength of the undisturbed seabed sediments at different stages under the cyclic loading. It is shown that during the cyclic loading process, the excess pore pressure response of undisturbed seabed sediment can be separated into 5 stages including gradual accumulation, partial dissipation, rapid accumulation, accumulated liquefaction and complete dissipation, which correspond to five processes of sediment strength variation including attenuation, increase, attenuation, loss and recovery, respectively. The grain size composition and structural strength dominate the excess pore pressure response. The wave-induced liquefied depth of intact seabed sediment is significantly affected by the initial physical properties such as dry density, void ratio, saturation degree, etc. To a large extent, the relative amount of fine grained components also controls the liquefaction characteristics of sediment in the Yellow River estuary.