STORM-WAVES-INDUCED SEABED SEDIMENT LIQUEFACTION AND RE-STRATIFICATION ON THE YELLOW RIVER SUBAQUEOUS DELTA
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摘要: 黄河水下三角洲存在封闭的塌陷凹坑,塌陷凹坑内部地层具有扰动结构。通过对黄河水下三角洲凹坑扰动地层的工程地质调查,获得扰动地层沉积物的粒度、容重、含水量、强度以及浅地层声学剖面特征。然后利用实验室波浪水槽试验,将黄河三角洲粉质土作为底床,在粉质土液化运动情况下,形成了与黄河水下三角洲现场相似的工程地层结构,由此分析认为由于风暴期间强烈波浪作用导致海底粉质土液化并发生运动,在原地发生不同粒径沉积物分异而重新形成沉积地层。并进一步给出了波浪导致粉质土液化运动形成原地风暴沉积地层的构造特征。Abstract: There are many collapse depressions at the Yellow River subaqueous Delta, of which the inner strata show disturbed structures. Through engineering geological investigation in the disturbed strata in depressions, particle size, bulk density, water content and soil strength of the sediments were collected, as well as features of the shallow-stratum acoustics profiles. In laboratory, flume experiments were carried out using the silty soil taken from the Yellow River delta for bottom bed. An engineering strata configuration similar to the disturbed stratum at the Yellow River subaqueous Delta was formed on the bed when it was liquefied and movable. It is concluded that liquefaction and movement of the silty seabed were caused by strong waves during the storm, leading to differentiation of sediments granularity and then in-situ re-stratification. Structural features of the storm deposited strata in-situ, formed by wave-induced liquefaction and movement, were also put forward.
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Key words:
- storm deposits /
- liquefaction /
- re-stratification /
- the Yellow River subaqueous delta
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