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选择黄河口浅滩不同沉积历史的4个典型研究区,取样进行室内物理力学参数测试,现场利用普氏贯入仪测量1m深度内土体强度在二维空间上的分布。然后,建立波浪作用下土体破坏的计算模型,计算50年一遇情况下土体破坏状况,并与调查的浅滩灾害比较。通过研究发现,黄河口浅滩沉积物处于超固结状态,且超固结比随深度增加而减小;浅滩沉积物强度在空间上表现出较强的非均匀性,大王北和刁口地区沉积物的强度要大于新滩和广利港地区的;沉积物在50年一遇波浪荷载下局部液化破坏深度可超过90cm,土体强度的空间非均匀性导致液化破坏后形成灾害现象。计算得到的灾害与现场调查结果具有一定的相似性,测试方法和计算方法可定量分析黄河口浅滩沉积物灾害的形成与特征。
Four typical study areas with different depositional history of the Yellow River estuary are selected for sampling physical and mechanical parameters in the laboratory. The distribution of soil strength in two-dimensional space within 1m depth was measured on-site using a Platts penetration instrument. Then, the calculation model of soil failure under wave action is established, and the damage status of soil under 50-year event is calculated and compared with the surveyed fordush disaster. The results show that the sediments in the shallow estuary of the Yellow River estuary are in an overconsolidated state and the overconsolidation ratio decreases as the depth increases. The strength of the shallow bank sediments shows strong inhomogeneity in space, and sediments in the Wangbei and Diaokou areas The strength of the material is greater than that of Xintan and Kwangli Port. The depth of partial liquefaction of sediments under 90watt wave load can exceed 90cm. The spatial heterogeneity of soil strength leads to the disastrous phenomenon after the liquefaction damage. The calculated disasters have some similarities with the field survey results. The test methods and calculation methods can quantitatively analyze the formation and characteristics of the sediments in the shallow estuary of the Yellow River estuary.