江苏沿海第四系沉积环境与软土性质研究

发布时间：2018-01-01 15:00

本文关键词：江苏沿海第四系沉积环境与软土性质研究　出处：《中国矿业大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文以江苏沿海地区第四纪沉积物为研究对象,整理分析连云港、盐城和南通三个测区的区调资料,结合第四纪钻孔资料和土工试验数据,对沿海地区第四纪沉积环境演化特征及其对第四纪软土物理力学性质影响进行了研究分析。依据地理位置、地貌和第四纪沉积物的特征,参照前人的划分方案,将江苏沿海地区第四系划分为长江三角洲区、淮河流域区和沂沭灌河流域区三个第四系小区。根据地层中常量元素和微量元素随深度变化特征,采用地球化学元素分析法将南通测区第四系划分为9个带,描述第四纪气候及沉积环境演化特征,并对常量元素之间的相关关系进行分析,结果表明:元素Si与Ti,元素Al与Fe、Ti及元素P与Mg、Ti之间在含量上都有较强的相关性;其他的某些元素之间在超过或者低于某一含量值后,才会表现出较强的相关性或者发生正负相关性的转化。从第四纪软土沉积环境的角度分析软土的物理力学性质变化规律,结果表明:连云港测区软土为滨海相沉积,其孔隙性、含水性和压缩性具有由陆地至海域递增的趋势,而密实性的变化趋势则与其相反;盐城测区软土为泻湖相沉积,其孔隙性、含水性和压缩性具有由泻湖中心向边界递增的趋势,密实性表现为相反的变化规律;南通测区软土为浅海相沉积,由于沉积环境的复杂性,软土物理力学性质变化无规律可寻。
[Abstract]:In this paper, the Quaternary sediments of Jiangsu coastal area as the research object, analysis of Lianyungang, three areas of the region in Yancheng and Nantong, combined with the Quaternary borehole data and geotechnical test data, the evolution characteristics of Quaternary sedimentary environment in coastal areas and its effects on physical and mechanical properties of Quaternary soft soil was analyzed. According to geographic location, characteristics geomorphology and Quaternary sediments, referring to the previous classification scheme, the Quaternary coastal region of Jiangsu into the Yangtze River Delta region, Huaihe basin region and Yishuhe River Basin Irrigation District three district. According to the characteristics of the Quaternary strata in the major elements and trace elements with depth, the geochemical element analysis of Quaternary measurement in Nantong divided into 9 zones, describing the Quaternary climate and sedimentary environment evolution characteristics, and the relationships between the major elements were analyzed, the results show that: Elements Si and Ti, Al and Fe elements, Ti elements and P and Mg, Ti in the content has a strong correlation; some other elements in the above or below a certain content value, will show a strong correlation between the conversion or the occurrence of positive and negative correlation. From the perspective of Quaternary sedimentary environment in soft soil analysis of physical and mechanical properties changes of soft soil. The results showed that the measurement in Lianyungang soft soil littoral facies, the porosity increased from the land to the sea, the trend of water and compression, but the change trend of density is the opposite; measurement in Yancheng soft soil as the lagoon facies, the porosity from the center to the lagoon, increasing trend of boundary water and compression with the density of the performance variation of the opposite; measurement in Nantong soft soil is neritic facies, due to the complexity of the sedimentary environment, soft soil physical and mechanical properties of change Can be found.

【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU447;P534.63

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