莱州湾海区沉积物的工程地质特征分析
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摘要
根据莱州湾沉积物的实验室分析资料,从物理性质和力学性质特征对海底沉积物的工程地质特征进行了综合研究,结果显示:研究区沉积物主要为淤泥质黏土,其次为淤泥、黏土、粉土,另含有极少量的粉砂,整体呈现为含水量低、天然密度大、孔隙比小、可塑性低、压缩性低、剪切强度高、贯入阻力大。从海底地形、物质来源、水动力特征、物质组成等方面对沉积物的工程特性进行了成因分析。莱州湾地势平坦,水体与外海交换能力差,沉积物的分布受地形和水动力特征的影响显著,淤泥主要出现于黄河入海口南北侧海域,黏土、粉土主要出现于莱州浅滩附近海域,粉砂分布于刁龙咀北部近岸海域,其他区域以淤泥质黏土分布为主。莱州湾沉积物主要来源于黄河携带的黄土高原物质,碳酸盐含量高,黏粒和亲水性黏土矿物含量较低,沉积物主要以胶结物和粉粒级碎屑的形式存在,导致湾内沉积物含水量低、天然密度大、塑性低、强度高。
A comprehensively geotechnical properties study was carried out through the analysis of the physic-mechanical properties of samples collected from the Laizhou Bay area.The results showed that the sediments in this area were mainly composed of muddy clay,with a small amount of mud,clay,silt,silty sand.The sediments were generally characterized by low water content,high density,low void ratio,low plasticity,low compressibility,high shear strength and high penetration resistance.Then,this study discussed some key factors that caused the geotechnical properties of the sediments in the Laizhou Bay,such as submarine topography,sediment source,hydrodynamic environment and material component.The submarine topography of the Laizhou Bay is flat with shallow water,and the exchange between the water body and the open sea is obstructed,so the distribution of sediments is obviously affected by topography and hydrodynamic conditions.Mud is mainly distributed in the northern and southern sides of the Yellow River estuary.Clay and silt are mainly distributed near the Laizhou shoal.Silt is distributed in the northern coast of the Diaolongzui.In the other areas of the bay,there is dominated by muddy clay.The sediments of the Laizhou Bay are dominated by the Loess Plateau material carried by the Yellow River,so the sediments have high content of carbonate,low content of clay and hydrophilic clay minerals,and the sediments are mainly in the form of cement and silty fragments,thereby sediments of the Laizhou Bay have low water content,high density,low plasticity,low compressibility,and high shear strength.
A comprehensively geotechnical properties study was carried out through the analysis of the physic-mechanical properties of samples collected from the Laizhou Bay area.The results showed that the sediments in this area were mainly composed of muddy clay,with a small amount of mud,clay,silt,silty sand.The sediments were generally characterized by low water content,high density,low void ratio,low plasticity,low compressibility,high shear strength and high penetration resistance.Then,this study discussed some key factors that caused the geotechnical properties of the sediments in the Laizhou Bay,such as submarine topography,sediment source,hydrodynamic environment and material component.The submarine topography of the Laizhou Bay is flat with shallow water,and the exchange between the water body and the open sea is obstructed,so the distribution of sediments is obviously affected by topography and hydrodynamic conditions.Mud is mainly distributed in the northern and southern sides of the Yellow River estuary.Clay and silt are mainly distributed near the Laizhou shoal.Silt is distributed in the northern coast of the Diaolongzui.In the other areas of the bay,there is dominated by muddy clay.The sediments of the Laizhou Bay are dominated by the Loess Plateau material carried by the Yellow River,so the sediments have high content of carbonate,low content of clay and hydrophilic clay minerals,and the sediments are mainly in the form of cement and silty fragments,thereby sediments of the Laizhou Bay have low water content,high density,low plasticity,low compressibility,and high shear strength.
引文
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